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Moore B, Toh SY, Wong YTA, Bashiri T, McKinnon A, Wai Y, Alethea Lee KW, Ovchinnikov P, Chiang CY, Djuricanin P, Momose T. Hydrocarboxyl Radical as a Product of α-Alanine Ultraviolet Photolysis. J Phys Chem Lett 2021; 12:11992-11997. [PMID: 34889613 DOI: 10.1021/acs.jpclett.1c03104] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
UV photodissociation of α-alanine was studied by parahydrogen matrix isolation infrared spectroscopy. The temporal behavior of Fourier transform infrared spectra revealed that UV irradiation at 213 nm yielded the HOCO radical as a direct photoproduct from the S2 excited state. The concentration of HOCO quickly approached a steady state due to secondary photodissociation of HOCO to produce CO2 + H or CO + OH. On the other hand, no photoproducts were detected by S1 excitation at 266 nm. Irradiation of fully deuterated α-alanine at 213 nm yielded ∼2 times more cis-DOCO radicals than the lower energy isomer trans-DOCO, indicating that the conformation of the hydroxyl group is fairly well-preserved upon photodissociation of α-alanine. The present study suggests that HOCO may be a good tracer species in the search for amino acids in interstellar space.
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Affiliation(s)
- Brendan Moore
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Shin Yi Toh
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Y T Angel Wong
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Termeh Bashiri
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Alexandra McKinnon
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Yonnie Wai
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Ka Wing Alethea Lee
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Polina Ovchinnikov
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Chih-Yu Chiang
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Pavle Djuricanin
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Takamasa Momose
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
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2
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Daescu M, Iota M, Serbschi C, Ion AC, Baibarac M. The Influence of UV Light on Photodegradation of Acetylsalicylic Acid. Int J Mol Sci 2021; 22:4046. [PMID: 33919943 PMCID: PMC8070936 DOI: 10.3390/ijms22084046] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 04/10/2021] [Accepted: 04/12/2021] [Indexed: 01/07/2023] Open
Abstract
Photodegradation of the aqueous solutions of acetylsalicylic acid, in the absence (ASA) and the presence of excipients (ASE), is demonstrated by the photoluminescence (PL). A shift of the PL bands from 342 and 338 nm to 358 and 361-397 nm for ASA and ASE in solid state and as aqueous solutions was reported. By exposure of the solution of ASA 0.3 M to UV light, a decrease in the PL band intensity was highlighted. This behavior was revealed for ASA in the presence of phosphate buffer (PB) having the pH equal to 6.4, 7, and 8 or by the interaction with NaOH 0.3 M. A different behavior was reported in the case of ASE. In the presence of PB, an increase in the intensity of the PL band of ASE simultaneously with a change of the ratio between the intensities of the bands at 361-364 and 394-397 nm was highlighted. The differences between PL spectra of ASA and ASE have their origin in the presence of salicylic acid (SAL). The interaction of ASE with NaOH induces a shift of the PL band at 405-407 nm. Arguments for the reaction of ASA with NaOH are shown by Raman scattering and FTIR spectroscopy.
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Affiliation(s)
- Monica Daescu
- Laboratory of Optical Processes in Nanostructured Materials, National Institute of Materials Physics, Atomistilor Street 405A, POB MG 7, 077125 Bucharest, Romania; (M.D.); (M.I.)
- Faculty of Applied Chemistry & Material Science, University Politehnica of Bucharest, Gh. Polizu Street 1-7, 011061 Bucharest, Romania;
| | - Miruna Iota
- Laboratory of Optical Processes in Nanostructured Materials, National Institute of Materials Physics, Atomistilor Street 405A, POB MG 7, 077125 Bucharest, Romania; (M.D.); (M.I.)
| | | | - Alina C. Ion
- Faculty of Applied Chemistry & Material Science, University Politehnica of Bucharest, Gh. Polizu Street 1-7, 011061 Bucharest, Romania;
| | - Mihaela Baibarac
- Laboratory of Optical Processes in Nanostructured Materials, National Institute of Materials Physics, Atomistilor Street 405A, POB MG 7, 077125 Bucharest, Romania; (M.D.); (M.I.)
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3
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Zhou W, Fu L, Zhao L, Xu X, Li W, Wen M, Wu Q. Novel Core-Sheath Cu/Cu 2O-ZnO-Fe 3O 4 Nanocomposites with High-Efficiency Chlorine-Resistant Bacteria Sterilization and Trichloroacetic Acid Degradation Performance. ACS Appl Mater Interfaces 2021; 13:10878-10890. [PMID: 33635062 DOI: 10.1021/acsami.0c21336] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In order to solve two issues of chlorine-resistant bacteria (CRB) and disinfection byproducts (DBPs) in tap water after the chlorine-containing treatment process, an innovative core-sheath nanostructured Cu/Cu2O-ZnO-Fe3O4 was designed and synthesized. The fabrication mechanism of the materials was then systematically analyzed to determine the component and valence state. The properties of CRB inactivation together with trichloroacetic acid (TCAA) photodegradation by Cu/Cu2O-ZnO-Fe3O4 were investigated in detail. It was found that Cu/Cu2O-ZnO-Fe3O4 displayed excellent antibacterial activity with a relatively low cytotoxicity concentration due to its synergism of nanowire structure, ion release, and reactive oxygen species generation. Furthermore, the Cu/Cu2O-ZnO-Fe3O4 nanocomposite also exhibited outstanding photocatalytic degradation activity on TCAA under simulated sunlight irradiation, which was verified to be dominated by the surface reaction through kinetic analysis. More interestingly, the cell growth rate of Cu/Cu2O-ZnO-Fe3O4 was determined to be 50% and 10% higher than those of Cu/Cu2O and Cu/Cu2O-ZnO after 10 h incubation, respectively, manifesting a weaker cytotoxicity. Therefore, the designed Cu/Cu2O-ZnO-Fe3O4 could be a promising agent for tap water treatment.
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Affiliation(s)
- Wei Zhou
- College of Environmental Science and Engineering, School of Chemical Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, Shanghai 200092, PR China
| | - Lin Fu
- College of Environmental Science and Engineering, School of Chemical Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, Shanghai 200092, PR China
| | - Long Zhao
- College of Environmental Science and Engineering, School of Chemical Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, Shanghai 200092, PR China
| | - Xiaojuan Xu
- Department of Pathology and Pathophysiology, School of Medicine, Tongji University, Shanghai 200092, PR China
| | - Weiying Li
- College of Environmental Science and Engineering, School of Chemical Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, Shanghai 200092, PR China
| | - Ming Wen
- College of Environmental Science and Engineering, School of Chemical Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, Shanghai 200092, PR China
| | - Qingsheng Wu
- College of Environmental Science and Engineering, School of Chemical Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Shanghai Key Laboratory of Chemical Assessment and Sustainability, Tongji University, Shanghai 200092, PR China
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Hu N, Lin L, Tan J, Wang W, Lei L, Fan H, Wang J, Müller-Buschbaum P, Zhong Q. Wearable Bracelet Monitoring the Solar Ultraviolet Radiation for Skin Health Based on Hybrid IPN Hydrogels. ACS Appl Mater Interfaces 2020; 12:56480-56490. [PMID: 33263977 DOI: 10.1021/acsami.0c17628] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The risk of extensive exposure of the human epidermis to solar ultraviolet radiation is significantly increased nowadays. It not only induces skin aging and solar erythema but also increases the possibility of skin cancer. Therefore, a simply prepared, highly sensitive, and optically readable device for monitoring the solar ultraviolet radiation is highly desired for the skin health management. Because of the photoinitiated polymerization triggered by graphene-carbon nitride (g-C3N4) under ultraviolet radiation, g-C3N4 is homogeneously distributed in the hybrid hydrogels containing N-isopropylacrymide (NIPAM), poly(ethylene glycol) methyl ether methacrylate (OEGMA300), and sodium alginate (SA). By further immersing the hybrid hydrogels into calcium chloride solution, hybrid alginate-Ca2+/P(NIPAM-co-OEGMA300)/g-C3N4 interpenetrating polymeric network (IPN) hydrogels are obtained. Due to the homogeneous distribution of g-C3N4 and the existence of thermoresponsive polymers, the hybrid IPN hydrogels present good adsorption capability and high degradation efficiency for methylene blue (MB) especially at high temperature under ultraviolet radiation. Based on this unique property, the bracelet monitoring skin health is prepared by simply immersing the hybrid IPN hydrogels into the MB solution and then wrapping it with PET foil. Because the immersion time for the top, middle, and bottom parts of the hybrid IPN hydrogels is gradually increased, their colors vary from light to dark blue. A longer time is required for the discoloration of the darker part under solar ultraviolet radiation. Thus, the bracelet can be used to conveniently monitor the dose of solar ultraviolet radiation by simply checking the discoloration in the bracelet under sunshine. Due to the facile preparation and low cost of the bracelet, it is a promising candidate for wearable devices for skin health management.
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Affiliation(s)
- Neng Hu
- Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, 310018 Hangzhou, China
| | - Li Lin
- Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, 310018 Hangzhou, China
| | - Jun Tan
- College of Biological, Chemical Science and Engineering, Jiaxing University, 314001 Jiaxing, China
| | - Weijia Wang
- State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, 710072 Xi'an, China
| | - Lin Lei
- State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, 710072 Xi'an, China
| | - Huiqing Fan
- State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, 710072 Xi'an, China
| | - Jiping Wang
- Shanghai University of Engineering Science, 333 Long Teng Road, 201620 Shanghai, China
| | - Peter Müller-Buschbaum
- Lehrstuhl für Funktionelle Materialien, Technische Universität München, Physik-Department, James-Franck-Str. 1, 85748 Garching, Germany
- Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstr. 1, 85748 Garching, Germany
| | - Qi Zhong
- Key Laboratory of Advanced Textile Materials & Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, 310018 Hangzhou, China
- Lehrstuhl für Funktionelle Materialien, Technische Universität München, Physik-Department, James-Franck-Str. 1, 85748 Garching, Germany
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5
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Golonka I, Wilk S, Musiał W. The Influence of UV Radiation on the Degradation of Pharmaceutical Formulations Containing Quercetin. Molecules 2020; 25:E5454. [PMID: 33233773 PMCID: PMC7699961 DOI: 10.3390/molecules25225454] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 11/13/2020] [Accepted: 11/16/2020] [Indexed: 11/16/2022] Open
Abstract
The aim of this study was to assess the photostability of quercetin in the presence of anionic and nonionic polymeric gels with varied compositions of an added component-glycerol. The samples were irradiated continuously at constant temperature. The stability of quercetin in solution and incorporated into the gels was evaluated by an UV-Vis spectrophotometer. FTIR spectroscopy (Fourier-transform infrared spectroscopy) was used to detect the changes in the structure of quercetin depending on the polymer used in the gel, and on the exposure time. Photostabilization is an important aspect of quality assurance in photosensitive compounds. The decomposition rate of quercetin in the ionic preparation of polyacrylic acid (PAA) with glycerol was 1.952·10-3 min-1, whereas the absence of glycerol resulted in a decay rate of 5.032·10-4 min-1. The formulation containing non-ionic methylcellulose resulted in a decomposition rate of quercetin in the range of 1.679·10-3 min-1. The decay rate of quercetin under light influence depended on the composition of the gel. It was found that the cross-linked PAA stabilized quercetin and the addition of glycerol accelerated the photodegradation.
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Affiliation(s)
| | | | - Witold Musiał
- Department of Physical Chemistry and Biophysics, Wroclaw Medical University, Borowska 211A, 50–556 Wroclaw, Poland; (I.G.); (S.W.)
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Osawa RA, Monteiro OC, Oliveira MC, Florêncio MH. Comparative study on photocatalytic degradation of the antidepressant trazodone using (Co, Fe and Ru) doped titanate nanowires: Kinetics, transformation products and in silico toxicity assessment. Chemosphere 2020; 259:127486. [PMID: 32634724 DOI: 10.1016/j.chemosphere.2020.127486] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 06/19/2020] [Accepted: 06/21/2020] [Indexed: 06/11/2023]
Abstract
Titanate nanomaterials have been outstanding in the removal of emerging contaminants by the photocatalysis process. These photocatalysts, when modified through techniques such as doping with metals, they have advantages over TiO2, especially in the region of visible light. In this work, the photocatalytic performance of four recent reported catalysts, pristine titanate nanowires, cobalt-doped titanate nanowires, iron-doped titanate nanowires and ruthenium-doped titanate nanowires, for the removal of the antidepressant trazodone under visible light radiation was compared. The iron-doped titanate nanowires presented the best catalytic activity by the catalyst surface area. Additionally, thirteen transformation products (TPs) were identified by high-resolution mass spectrometry and, to the best of our knowledge, nine of them have never been described in the literature. It was shown that for each catalyst different TPs were formed with distinct time profiles. Finally, toxicity assessment by computational methods showed that TPs were not readily biodegradable and they presented toxicity to aquatic organisms with mutagenic potential. These findings reinforce the importance of taking into consideration the TPs formed during the removal of pollutants since many of them may be toxic and can be produced during photocatalysis.
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Affiliation(s)
- Rodrigo A Osawa
- Departamento de Química e Bioquímica, Faculdade de Ciências, ULisboa, 1749-016, Lisboa, Portugal; Laboratório de FTICR e Espectrometria de Massa Estrutural, Faculdade de Ciências, ULisboa, 1749-016, Lisboa, Portugal.
| | - Olinda C Monteiro
- Centro de Química Estrutural, Faculdade de Ciências, ULisboa, 1749-016, Lisboa, Portugal
| | - M Conceição Oliveira
- Centro de Química Estrutural, Instituto Superior Técnico, ULisboa, 1049-001, Lisboa, Portugal
| | - M Helena Florêncio
- Departamento de Química e Bioquímica, Faculdade de Ciências, ULisboa, 1749-016, Lisboa, Portugal; Laboratório de FTICR e Espectrometria de Massa Estrutural, Faculdade de Ciências, ULisboa, 1749-016, Lisboa, Portugal
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7
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Kása Z, Almási EE, Hernádi K, Gyulavári T, Baia L, Veréb G, László Z, Pap Z. New Insights into The Photoactivity of Shape-Tailored BiVO 4 Semiconductors via Photocatalytic Degradation Reactions and Classical Reduction Processes. Molecules 2020; 25:molecules25204842. [PMID: 33092291 PMCID: PMC7587982 DOI: 10.3390/molecules25204842] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 10/08/2020] [Accepted: 10/15/2020] [Indexed: 11/16/2022] Open
Abstract
In the present study, additive-free, pH-driven, hydrothermal crystallization was used to obtain shape-tailored monoclinic BiVO4 photocatalysts. The as-prepared BiVO4 products were systematically characterized, uncovering their crystallographic, morphologic and optical properties, while their applicability was verified in the visible light-driven photodegradation of oxalic acid and rhodamine B. Monoclinic clinobisvanite was obtained in most cases, with their band gap values located between 2.1 and 2.4 eV. The morphology varied from large, aggregated crystals, individual microcrystals to hierarchical microstructures. It was found that the degradation efficiency values obtained in the case of oxalic acid were directly related to the presence of (040) crystallographic plane, while the degradation of rhodamine B was partially independent by the presence of this structural feature. The importance of (040) crystallographic plane was also demonstrated via the reduction of Cu2+ to Cu, by analyzing the Raman spectra of the Cu containing samples, the mean primary crystallite size of Cu and Cu content. Furthermore, the presence of (040) crystallographic plane was directly proportional with the hydrodynamic properties of the powders as well.
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Affiliation(s)
- Zsolt Kása
- Institute of Environmental Science and Technology, University of Szeged, Tisza Lajos blvd. 103, H-6725 Szeged, Hungary; (Z.K.); (E.E.A.)
| | - Enikő Eszter Almási
- Institute of Environmental Science and Technology, University of Szeged, Tisza Lajos blvd. 103, H-6725 Szeged, Hungary; (Z.K.); (E.E.A.)
- Vulcano Research Group, Department of Mineralogy, Geochemistry and Petrology, University of Szeged, Egyetem Street 2, H-6722 Szeged, Hungary
| | - Klára Hernádi
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla sqr. 1, H-6720 Szeged, Hungary; (K.H.); (T.G.)
| | - Tamás Gyulavári
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla sqr. 1, H-6720 Szeged, Hungary; (K.H.); (T.G.)
| | - Lucian Baia
- Nanostructured Materials and Bio-Nano-Interfaces Center, Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeș-Bolyai University, Treboniu Laurian str. 42, RO-400271 Cluj-Napoca, Romania
- Faculty of Physics, Babeș-Bolyai University, M. Kogălniceanu str. 1, RO-400084 Cluj-Napoca, Romania
- Correspondence: (L.B.); or (Z.P.)
| | - Gábor Veréb
- Faculty of Engineering, Institute of Process Engineering, University of Szeged, Moszkvai Blvd. 9, H-6725 Szeged, Hungary; (G.V.); (Z.L.)
| | - Zsuzsanna László
- Faculty of Engineering, Institute of Process Engineering, University of Szeged, Moszkvai Blvd. 9, H-6725 Szeged, Hungary; (G.V.); (Z.L.)
| | - Zsolt Pap
- Institute of Environmental Science and Technology, University of Szeged, Tisza Lajos blvd. 103, H-6725 Szeged, Hungary; (Z.K.); (E.E.A.)
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla sqr. 1, H-6720 Szeged, Hungary; (K.H.); (T.G.)
- Nanostructured Materials and Bio-Nano-Interfaces Center, Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeș-Bolyai University, Treboniu Laurian str. 42, RO-400271 Cluj-Napoca, Romania
- Correspondence: (L.B.); or (Z.P.)
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Abstract
Hydrogels for wound management and tissue gluing applications have to adhere to tissues for a given time scale and then disappear, either by removal from the skin or by slow degradation for applications inside the body. Advanced wound management materials also envision the encapsulation of therapeutic drugs or cells to support the natural healing process. The design of hydrogels that can fulfill all of these properties with minimal chemical complexity, a stringent condition to favor transfer into a real medical device, is challenging. Herein, we present a hydrogel design with a moderate structural complexity that fulfills a number of relevant properties for wound dressing: it can form in situ and encapsulate cells, it can adhere to tissues, and it can be degraded on demand by light exposure under cytocompatible conditions. The hydrogels are based on starPEG macromers terminated with catechol groups as cross-linking units and contain intercalated photocleavable nitrobenzyl triazole groups. Hydrogels are formed under mild conditions (N-(2-hydroxyethyl)piperazine-N'-ethanesulfonic acid (HEPES) buffer with 9-18 mM sodium periodate as the oxidant) and are compatible with encapsulated cells. Upon light irradiation, the cleavage of the nitrobenzyl group mediates depolymerization, which enables the on-demand release of cells and debonding from tissues. The molecular design and obtained properties reported here are interesting for the development of advanced wound dressings and cell therapies and expand the range of functionality of current alternatives.
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Affiliation(s)
- Maria Villiou
- INM-Leibniz Institute for New Materials, Campus D2-2, 66123 Saarbrücken, Germany
- Chemistry Department, Saarland University, 66123 Saarbrücken, Germany
| | - Julieta I Paez
- INM-Leibniz Institute for New Materials, Campus D2-2, 66123 Saarbrücken, Germany
| | - Aránzazu Del Campo
- INM-Leibniz Institute for New Materials, Campus D2-2, 66123 Saarbrücken, Germany
- Chemistry Department, Saarland University, 66123 Saarbrücken, Germany
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9
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Blevins MS, James VK, Herrera CM, Purcell AB, Trent MS, Brodbelt JS. Unsaturation Elements and Other Modifications of Phospholipids in Bacteria: New Insight from Ultraviolet Photodissociation Mass Spectrometry. Anal Chem 2020; 92:9146-9155. [PMID: 32479092 PMCID: PMC7384744 DOI: 10.1021/acs.analchem.0c01449] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Glycerophospholipids (GPLs), one of the main components of bacterial cell membranes, exhibit high levels of structural complexity that are directly correlated with biophysical membrane properties such as permeability and fluidity. This structural complexity arises from the substantial variability in the individual GPL structural components such as the acyl chain length and headgroup type and is further amplified by the presence of modifications such as double bonds and cyclopropane rings. Here we use liquid chromatography coupled to high-resolution and high-mass-accuracy ultraviolet photodissociation mass spectrometry for the most in-depth study of bacterial GPL modifications to date. In doing so, we unravel a diverse array of unexplored GPL modifications, ranging from acyl chain hydroxyl groups to novel headgroup structures. Along with characterizing these modifications, we elucidate general trends in bacterial GPL unsaturation elements and thus aim to decipher some of the biochemical pathways of unsaturation incorporation in bacterial GPLs. Finally, we discover aminoacyl-PGs not only in Gram-positive bacteria but also in Gram-negative C. jejuni, advancing our knowledge of the methods of surface charge modulation that Gram-negative organisms may adopt for antibiotic resistance.
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Affiliation(s)
- Molly S Blevins
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Virginia K James
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Carmen M Herrera
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, Georgia 30602, United States
| | - Alexandria B Purcell
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, Georgia 30602, United States
| | - M Stephen Trent
- Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, Georgia 30602, United States
- Department of Microbiology, College of Arts and Sciences, University of Georgia, Athens, Georgia 30602, United States
- Center for Vaccines and Immunology, University of Georgia, Athens, Georgia 30602, United States
| | - Jennifer S Brodbelt
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
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10
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Wei H, Loeb SK, Halas NJ, Kim JH. Plasmon-enabled degradation of organic micropollutants in water by visible-light illumination of Janus gold nanorods. Proc Natl Acad Sci U S A 2020; 117:15473-15481. [PMID: 32571948 PMCID: PMC7354998 DOI: 10.1073/pnas.2003362117] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The development of sustainable methods for the degradation of pollutants in water is an ongoing critical challenge. Anthropogenic organic micropollutants such as pharmaceuticals, present in our water supplies in trace quantities, are currently not remediated by conventional treatment processes. Here, we report an initial demonstration of the oxidative degradation of organic micropollutants using specially designed nanoparticles and visible-wavelength sunlight. Gold "Janus" nanorods (Au JNRs), partially coated with silica to enhance their colloidal stability in aqueous solutions while also maintaining a partially uncoated Au surface to facilitate photocatalysis, were synthesized. Au JNRs were dispersed in an aqueous solution containing peroxydisulfate (PDS), where oxidative degradation of both simulant and actual organic micropollutants was observed. Photothermal heating, light-induced hot electron-driven charge transfer, and direct electron shuttling under dark conditions all contribute to the observed oxidation chemistry. This work not only provides an ideal platform for studying plasmonic photochemistry in aqueous medium but also opens the door for nanoengineered, solar-based methods to remediate recalcitrant micropollutants in water supplies.
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Affiliation(s)
- Haoran Wei
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06511
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Rice University, Houston, TX 77005
| | - Stephanie K Loeb
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06511
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Rice University, Houston, TX 77005
| | - Naomi J Halas
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Rice University, Houston, TX 77005;
- Department of Chemistry, Rice University, Houston, TX 77005
| | - Jae-Hong Kim
- Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06511;
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, Rice University, Houston, TX 77005
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11
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Zhao Z, Poojary MM, Skibsted LH, Lund MN. Cleavage of Disulfide Bonds in Cystine by UV-B Illumination Mediated by Tryptophan or Tyrosine as Photosensitizers. J Agric Food Chem 2020; 68:6900-6909. [PMID: 32437144 DOI: 10.1021/acs.jafc.0c01760] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Photolytic cleavage of disulfide bonds in proteins by UV light will influence their structure and functionality. The present study aimed to investigate the efficiency of disulfide cleavage by UV-B light in a system without a protein backbone consisting of combinations of cystine (a disulfide) and tryptophan (Trp) or tyrosine (Tyr) under anaerobic and aerobic conditions and to identify oxidation products formed by UV-B light. Cystine was reduced to cysteine (Cys) almost with a 1:1 stoichiometry by photoexcited Trp for anaerobic equimolar aqueous solutions (each 200 μM; pH 7.0), while photoexcited Tyr provided lower concentrations of Cys. The calculation of apparent quantum yields allowed for a comparison between the efficiency of reactions and showed that formation of Cys from disulfide cleavage of cystine was more efficient by photoexcited Trp than by photoexcited Tyr and of cystine alone and that Trp was more sensitive to photodegradation than Tyr and cystine under both aerobic and anaerobic conditions. Increasing the ratio between cystine and Trp to a 1:2 ratio did not increase the efficiency of free thiol formation but caused a more efficient photodegradation of Trp. The free thiol formed from disulfide cleavage of cystine was further oxidized to other unidentified compounds. Trp oxidation products (3-hydroxykynurenine (3-OH-Kyn) and tryptamine) were only identified in minor concentrations following light exposure of cystine and Trp in 1:1 and 1:2 ratios under both aerobic and anaerobic conditions, indicating further photodegradation to unidentified compounds. 3,4-Dihydroxyphenylalanine (DOPA) was formed from the oxidation of Tyr in the illuminated samples of cystine and Tyr in a 1:1 ratio under both aerobic and anaerobic conditions.
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Affiliation(s)
- Zichen Zhao
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg, Denmark
| | - Mahesha M Poojary
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg, Denmark
| | - Leif H Skibsted
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg, Denmark
| | - Marianne N Lund
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg, Denmark
- Department of Biomedical Sciences, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen N, Denmark
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12
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Kolbowski L, Belsom A, Rappsilber J. Ultraviolet Photodissociation of Tryptic Peptide Backbones at 213 nm. J Am Soc Mass Spectrom 2020; 31:1282-1290. [PMID: 32352297 PMCID: PMC7273743 DOI: 10.1021/jasms.0c00106] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 04/30/2020] [Accepted: 04/30/2020] [Indexed: 05/23/2023]
Abstract
We analyzed the backbone fragmentation behavior of tryptic peptides of a four-protein mixture and of E. coli lysate subjected to ultraviolet photodissociation (UVPD) at 213 nm on a commercially available UVPD-equipped tribrid mass spectrometer. We obtained 15 178 unique high-confidence peptide UVPD spectrum matches by recording a reference beam-type collision-induced dissociation (HCD) spectrum of each precursor, ensuring that our investigation includes a broad selection of peptides, including those that fragmented poorly by UVPD. Type a, b, and y ions were most prominent in UVPD spectra, and median sequence coverage ranged from 5.8% (at 5 ms laser excitation time) to 45.0% (at 100 ms). Overall, the sequence fragment intensity remained relatively low (median: 0.4% (5 ms) to 16.8% (100 ms) of total intensity), and the remaining precursor intensity, high. The sequence coverage and sequence fragment intensity ratio correlated with the precursor charge density, suggesting that UVPD at 213 nm may suffer from newly formed fragments sticking together due to noncovalent interactions. The UVPD fragmentation efficiency therefore might benefit from supplemental activation, as was shown for ETD. Aromatic amino acids, most prominently tryptophan, facilitated UVPD. This points to aromatic tags as possible enhancers of UVPD. Data are available via ProteomeXchange with identifier PXD018176 and on spectrumviewer.org/db/UVPD-213nm-trypPep.
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Affiliation(s)
- Lars Kolbowski
- Bioanalytics, Institute of Biotechnology, Technische
Universität Berlin, 13355 Berlin, Germany
- Wellcome Centre for Cell Biology, School of Biological Sciences,
University of Edinburgh, Edinburgh EH9 3BF, United
Kingdom
| | - Adam Belsom
- Bioanalytics, Institute of Biotechnology, Technische
Universität Berlin, 13355 Berlin, Germany
- Wellcome Centre for Cell Biology, School of Biological Sciences,
University of Edinburgh, Edinburgh EH9 3BF, United
Kingdom
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13
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Ma Z, Huang X, Xu N, Li J, Zhou C, Deng L, He Y. An effective strategy for boosting photoinduced charge separation of Ag 3PO 4 by BiVO 4 with enhanced visible light photodegradation efficiency for levofloxacin and methylene blue. Spectrochim Acta A Mol Biomol Spectrosc 2020; 229:117986. [PMID: 31887673 DOI: 10.1016/j.saa.2019.117986] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 12/15/2019] [Accepted: 12/20/2019] [Indexed: 06/10/2023]
Abstract
In this paper, a Z-scheme Ag3PO4/BiVO4 photocatalyst was successfully prepared by precipitation-deposition method. The Ag3PO4/BiVO4 composite exhibited enhanced photocatalytic activity and recyclability for levofloxacin and methylene blue degradation under visible light irradiation. In the Ag3PO4/BiVO4-0.4 system, up to 92.44% of the levofloxacin molecules can be decomposed within 180 min and the photocatalytic degradation efficiency can maintain at 92.02% for methylene blue after recycled for 5 times. The enhanced photocatalytic activity of Ag3PO4/BiVO4 heterojunctions could be mainly attributed to the fabrication of hetero-structure between BiVO4 and Ag3PO4. The photogenerated electron-hole pair separation was effectively enhanced based on the photocurrent, electro-chemical impedance spectra and photoluminescence data. Furthermore, the electrons transfer from photoinduced BiVO4 to Ag3PO4 and the visible light harvesting efficiencies were significantly increased due to the BiVO4 hybridization. The ·OH was the main oxidative species in the Ag3PO4/BiVO4 system for the methylene blue decomposition. Finally, a purposed photocatalytic mechanism for methylene blue degradation was discussed in detail on the basis of experimental results.
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Affiliation(s)
- Zhanying Ma
- Department of Chemistry, Xianyang Normal University, Xianyang 712000, China
| | - Xuening Huang
- Department of Chemistry, Xianyang Normal University, Xianyang 712000, China
| | - Na Xu
- Department of Applied Chemistry, Xi'an University of Technology, Xi'an 710048, China
| | - Jiaqing Li
- Department of Applied Chemistry, Xi'an University of Technology, Xi'an 710048, China
| | - Caihua Zhou
- Department of Chemistry, Xianyang Normal University, Xianyang 712000, China
| | - Lingjuan Deng
- Department of Chemistry, Xianyang Normal University, Xianyang 712000, China
| | - Yangqing He
- Department of Applied Chemistry, Xi'an University of Technology, Xi'an 710048, China; State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048, China.
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14
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Tu X, Meng X, Pan Y, Crittenden JC, Wang Y. Degradation kinetics of target compounds and correlations with spectral indices during UV/H 2O 2 post-treatment of biologically treated acrylonitrile wastewater. Chemosphere 2020; 243:125384. [PMID: 31759207 DOI: 10.1016/j.chemosphere.2019.125384] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 11/14/2019] [Accepted: 11/14/2019] [Indexed: 06/10/2023]
Abstract
In this study, the post-treatment of biologically treated acrylonitrile wastewater was investigated during UV/H2O2 process. Five contaminants in the effluent were selected as target compounds, including Furmaronitrile (FMN), 3-Pyridinecarbonitrile (3PCN), 1,3-Dicyanobenzene (1,3-DCB), 5-Methyl-1H-benzotriazole (5MBT), and 7-Azaindole (7AID). Under optimal reaction conditions, the UV/H2O2 post-treatment exhibited good performances in destruction of organic compounds and toxicity. The photo-chemical parameters of the target compounds were measured and it was found that 5MBT and 3PCN had fast degradation rate constants under direct UV photolysis. The second-order rate constants of the target compounds with hydroxyl radicals were determined to be in the range of (1.0-5.0) × 109 M-1 s-1 at pH 3.0 and 25 °C. A simplified pseudo-first-order steady state (Sim-PSS) model, which considered direct UV photolysis and radical oxidation simultaneously, agreed well with the experimental data from the post-treatment of a biologically treated effluent. High-performance size exclusion chromatography (HPSEC) coupled with diode-array detector (DAD) and fluorescence detector (FLD) analysis revealed that humic-like sub-peak signals from different molecular weights of fluorescent organic matter decreased consistently during the oxidation process, which made humic-like fluorescence exhibit higher correlation with the target compounds' degradation than the spectral indices of UV absorbance at 254 nm (UVA254) and protein-like fluorescence.
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Affiliation(s)
- Xiang Tu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, 100012, Beijing, PR China
| | - Xiaoyang Meng
- School of Civil and Environmental Engineering, Georgia Institute of Technology, 30332, Atlanta, GA, United States
| | - Yang Pan
- Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, 215011, Suzhou, China.
| | - John C Crittenden
- School of Civil and Environmental Engineering, Georgia Institute of Technology, 30332, Atlanta, GA, United States
| | - Yaye Wang
- School of Civil and Environmental Engineering, Georgia Institute of Technology, 30332, Atlanta, GA, United States
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15
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Abstract
The efficacy of a sunscreen tends to be associated with its sun protection factor (SPF) value, a figure determined in a test that relies on the independence of the SPF value to both UV radiation dose and irradiance. We probe these assumptions when photoinduced product degradation is present, and we estimate that the theoretical limit for their validity is when the sunfilter active molecule relaxation time is faster than ∼10 ns. While such threshold relaxation time should be compatible with the expected ultrafast relaxation mechanisms of sunfilter molecules (picoseconds), recent research on sunfilter photodynamics has identified the existence of much longer-lived molecular states. Such long lifetimes could compromise sunscreen performance and make the SPF value very different in natural sun irradiance conditions than in the solar simulated conditions typically used in SPF determination tests.
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Affiliation(s)
| | - Xavier Cartoixà
- Departament d'Enginyeria Electrònica , Universitat Autònoma de Barcelona , 08193 Cerdanyola del Vallès , Spain
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16
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Timm A, Abendschön P, Tölgyesi L, Horn H, Borowska E. Solar-mediated degradation of linezolid and tedizolid under simulated environmental conditions: Kinetics, transformation and toxicity. Chemosphere 2020; 241:125111. [PMID: 31683437 DOI: 10.1016/j.chemosphere.2019.125111] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 10/10/2019] [Accepted: 10/12/2019] [Indexed: 06/10/2023]
Abstract
Linezolid (LIN) and Tedizolid (TED) are representatives of oxazolidinone antibiotics of last resort with a strong efficacy against gram-positive bacteria. This study focused on their solar-mediated degradation to understand better their fate in aquatic environment, for the realistic concentrations in the range of 1 μg/L. Results showed that both antibiotics (ABs) are degradable by simulated sunlight (1 kW/m2), with half-lives of 32 and 93 h in ultrapure water, for LIN and TED, respectively. LIN showed similar photolytic behaviour in pure solution and in surface water, whereas sunlight enhanced the degradation of LIN in pure solutions, but not in surface water. Structure elucidation by liquid chromatography coupled to high resolution mass spectrometry provided information about seven transformation products for LIN and five for TED. The morpholinyl-ring was identified as the target site for most transformation reactions of LIN. TED was prone to oxidation and cleavage of the oxazolidinone ring. Results of a growth inhibition test on Bacillus subtilis exposed to UV light showed antibacterial efficacy of transformation products of LIN and no significant efficacy of degradation products of TED for the concentration range of 100 μg/L-10 mg/L of parent compounds. Photolytically treated solutions of the ABs maintained their inhibitory effect on the bioluminescence of Aliivibrio fischeri.
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Affiliation(s)
- Alexander Timm
- Karlsruhe Institute of Technology (KIT), Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9a, 76131, Karlsruhe, Germany
| | - Patrick Abendschön
- Hochschule Bonn-Rhein-Sieg, Section 5, von-Liebig-Straße 20, 53359, Rheinbach, Germany
| | - László Tölgyesi
- Agilent Technologies Sales & Services GmbH and Co. KG, Hewlett-Packard-Straße 8, 76337, Waldbronn, Germany
| | - Harald Horn
- Karlsruhe Institute of Technology (KIT), Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9a, 76131, Karlsruhe, Germany; DVGW Research Laboratories for Water Chemistry and Water Technology, Engler-Bunte-Ring 9a, 76131, Karlsruhe, Germany.
| | - Ewa Borowska
- Karlsruhe Institute of Technology (KIT), Engler-Bunte-Institut, Water Chemistry and Water Technology, Engler-Bunte-Ring 9a, 76131, Karlsruhe, Germany
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17
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Abstract
Folic acid, a synthetic form of folate, is a water-soluble vitamin that is essential during periods of rapid cell division and growth. However, it decomposes upon ultraviolet irradiation to form inactive photoproducts. In this study, the protective effect and mechanisms of antioxidants, including cinnamic acids, flavonoids, catechol and its derivatives, stilbenes, p-benzoquinone and its derivatives, isoprenoids, curcumin, oleic acid, and linoleic acid, against folic acid photodecomposition were investigated by using fluorescence and absorbance spectroscopy, high-performance liquid chromatography, and antioxidant assay. It was found that antioxidants could inhibit or delay the folic acid decomposition in varying degrees, among which caffeic acid was the most effective. The increase in its remarkable antioxidant efficiency and absorbance in the UVA region during irradiation contributed to its effective protection. This finding could be useful for the protection of photolabile components in food and other uses.
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18
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Anwar Z, Sheraz MA, Ahmed S, Mustaan N, Khurshid A, Gul W, Khattak SUR, Ahmad I. Photolysis of thiochrome in aqueous solution: A kinetic study. J Photochem Photobiol B 2020; 203:111766. [PMID: 31927488 DOI: 10.1016/j.jphotobiol.2019.111766] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 12/19/2019] [Accepted: 12/27/2019] [Indexed: 06/10/2023]
Abstract
The photolysis of thiochrome (THC), an oxidation product of thiamine (vitamin B1) (THE), used for its fluorimetric assay, has been studied in the pH range 7.0-12.0. THC undergoes photooxidation to oxodihydrothiochrome (ODTHC) which is oxidized to a non-fluorescent compound (OP1) on UV irradiation. The kinetics of the consecutive first-order reactions: THC→k1ODTHC→k2OP1, has been evaluated and the values of first-order rate constants, k1 (0.58-4.20 × 10-5, s-1) and k2 (0.05-2.03 × 10-5, s-1), at pH 7.0-12.0 have been determined. The rates of degradation of THC and ODTHC are enhanced with pH and the second-order rate constants k1' and k2' for the OH- ion-catalyzed reaction are in the range of 0.002-58.3 M-1 s-1. The quantum yields of the photolysis of THC and ODTHC in the pH range 7.0-12.0 have been determined. THC, ODTHC and OP1 have been identified by chromatographic, spectrometric and fluorimetric methods. THC and ODTHC have similar fluorescence characteristics and emit at 450 and 445 nm, respectively. THC, ODTHC and OP1 with distinct absorption maxima (370, 344 and 290 nm, respectively) have been determined by a newly developed and validated multicomponent spectrometric method during the photolysis reactions. The on-line formation of THC by the photooxidation of THE may lead to the degradation of THC and give erroneous results in the fluorimetric assay of THE. A scheme for the photolysis reactions of THC in aqueous solution is presented.
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Affiliation(s)
- Zubair Anwar
- Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Super Highway, Gadap Road, near Toll Plaza, Karachi 74600, Pakistan.
| | - Muhammad Ali Sheraz
- Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Super Highway, Gadap Road, near Toll Plaza, Karachi 74600, Pakistan
| | - Sofia Ahmed
- Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Super Highway, Gadap Road, near Toll Plaza, Karachi 74600, Pakistan
| | - Nafeesa Mustaan
- Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Super Highway, Gadap Road, near Toll Plaza, Karachi 74600, Pakistan
| | - Adeela Khurshid
- Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Super Highway, Gadap Road, near Toll Plaza, Karachi 74600, Pakistan
| | - Wajiha Gul
- Department of Pharmaceutical Chemistry, Dow College of Pharmacy, Dow University of Health Sciences, Karachi 74200, Pakistan
| | - Saif-Ur-Rehman Khattak
- Central Drug Laboratories, Ministry of Health, DRAP, Block-B, S.M.C.H., Karachi 74400, Pakistan
| | - Iqbal Ahmad
- Baqai Institute of Pharmaceutical Sciences, Baqai Medical University, Super Highway, Gadap Road, near Toll Plaza, Karachi 74600, Pakistan
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19
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Wang L, Bian Z. Photocatalytic degradation of paracetamol on Pd-BiVO 4 under visible light irradiation. Chemosphere 2020; 239:124815. [PMID: 31526994 DOI: 10.1016/j.chemosphere.2019.124815] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 09/02/2019] [Accepted: 09/07/2019] [Indexed: 05/09/2023]
Abstract
In this study, Pd-BiVO4 bearing highly dispersed Pd nanoparticles was prepared from pure BiVO4 using an impregnation method. The pure BiVO4 and Pd-BiVO4 catalysts were characterized by X-ray diffraction, scanning electron microscopy, UV-visible diffuse reflection, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results showed that the prepared catalysts had a monoclinic scheelite structure and exhibited a flake-like morphology. Pd-BiVO4 showed a distinct response in the visible light region, with an extended absorption edge at 550 nm. According to the Scherrer formula, the nanocrystal particle sizes of the BiVO4 and Pd-BiVO4 catalysts were 35 and 28 nm, respectively. Highly dispersed Pd nanoparticles with sizes of 2.5 ± 0.5 nm were observed on the BiVO4 surface. Two Pd valence states, Pd(II) and Pd(0), were identified in a 2:1 ratio. Pd-BiVO4 exhibited excellent activity for paracetamol (PCT) degradation, with 100% removal achieved in 1 h under visible light irradiation. During degradation, the mineralization ratio reached up to 40% total organic carbon removal. Two highly active species, namely, hydroxyl and superoxide radicals, were determined by electron spin resonance (ESR). Furthermore, the potential degradation of PCT in this system was proposed based on intermediate information obtained using HPLC-MS and Gauss analysis. The high dispersion and small size of Pd nanoparticles might favor the removal of emerging contaminants using the Pd-BiVO4 photocatalytic system.
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Affiliation(s)
- Linyuan Wang
- College of Water Sciences, Beijing Normal University, Beijing, 100875, PR China
| | - Zhaoyong Bian
- College of Water Sciences, Beijing Normal University, Beijing, 100875, PR China.
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20
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Kowalska K, Maniakova G, Carotenuto M, Sacco O, Vaiano V, Lofrano G, Rizzo L. Removal of carbamazepine, diclofenac and trimethoprim by solar driven advanced oxidation processes in a compound triangular collector based reactor: A comparison between homogeneous and heterogeneous processes. Chemosphere 2020; 238:124665. [PMID: 31473529 DOI: 10.1016/j.chemosphere.2019.124665] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 08/19/2019] [Accepted: 08/24/2019] [Indexed: 06/10/2023]
Abstract
Contaminants of emerging concern (including pharmaceuticals) are not effectively removed by municipal wastewater treatment plants (WWTPs), so particular concern is related to agricultural wastewater reuse due to their possible uptake in crops irrigated with WWTPs effluents. Advanced oxidation processes (AOPs) and solar AOPs have been demonstrated to effectively remove pharmaceuticals from different aqueous matrices. In this study, an heterogeneous photocatalytic process using powdered nitrogen-doped TiO2 immobilized on polystyrene spheres (sunlight/N-TiO2) was compared to the benchmark homogenous AOP sunlight/H2O2 in a compound triangular collector reactor, to evaluate the degradation of three pharmaceuticals (carbamazepine (CBZ), diclofenac (DCF), trimethoprim (TMP)) in water. The degradation of the contaminants by sunlight and sunlight-AOPs well fit the pseudo-first order kinetic model (but for TMP under sunlight). High removal efficiency by solar photolysis was observed for DCF (up to 100%, half-life sunlight cumulative energy QS,1/2 = 2 kJ L-1, half-life time t1/2 = 32 min), while CBZ (32%, QS,1/2 = 28 kJ L-1, t1/2 = 385 min) and TMP (5% removal after 300 min) removal was poor. The degradation rate of CBZ, TMP and DCF was found to be slower during sunlight/H2O2 (QS,1/2 = 5 kJ L-1, t1/2 = 77 min; QS,1/2 = 20 kJ L-1, t1/2 = 128 min; QS,1/2 = 4 kJ L-1, t1/2 = 27 min, respectively) compared to sunlight/N-TiO2 (QS,1/2 = 4 kJ L-1, t1/2 = 55 min; QS,1/2 = 3 kJ L-1, t1/2 = 42 min; QS,1/2 = 2 kJ L-1, t1/2 = 25 min, respectively). These results are promising in terms of solar technology upscale because the faster degradation kinetics observed for sunlight/N-TiO2 process would result in smaller treatment volume, thus possibly perspective compensating the cost of the photocatalyst.
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Affiliation(s)
- K Kowalska
- Environmental Biotechnology Department, Faculty of Energy and Environmental Engineering, Silesian University of Technology, ul. Akademicka 2, 44-100, Gliwice, Poland; The Biotechnology Centre, Silesian University of Technology, ul. B. Krzywoustego 8, 44-100, Gliwice, Poland
| | - G Maniakova
- Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, SA, Italy
| | - M Carotenuto
- Department of Chemistry and Biology "Adolfo Zambelli", University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, SA, Italy
| | - O Sacco
- Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, SA, Italy
| | - V Vaiano
- Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, SA, Italy
| | - G Lofrano
- Department of Chemistry and Biology "Adolfo Zambelli", University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, SA, Italy; Centro Servizi Metrologici e Tecnologici Avanzati (CeSMA), University of Naples "Federico II", via Cinthia ed. 7, 80126, Naples, Italy
| | - L Rizzo
- Department of Civil Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084, Fisciano, SA, Italy.
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21
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Humeres E, Canle M, Lopes CN, Santaballa JA, Debacher NA, Moreira RDFPM, Safin V, Pérez MIF. Photo-immobilization of proteins on carbons. J Photochem Photobiol B 2020; 202:111675. [PMID: 31733612 DOI: 10.1016/j.jphotobiol.2019.111675] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 10/16/2019] [Accepted: 10/26/2019] [Indexed: 06/10/2023]
Abstract
The photofunctionalization of three different carbons with two proteins was studied at room temperature. Water solutions of bovine serum albumin, BSA, and α-amylase, AA, were photolyzed at 21 °C in the presence of graphite microparticles (6.20 μm), MPG, graphene oxide, MPGO, and graphene oxide modified with SO2, mMPGO. The insertion of BSA on carbon matrixes occurred with a deoxygenation reaction, most likely due to a dehydration step of a water molecule. XPS, TOC and TGA, showed that the BSA photo-insertion on MPG was highly efficient with 34.9% of the weight of MPG after photolysis, with an initial concentration of 1 g∙L-1 of BSA. A high yield of AA photoinsertion on the carbons was also obtained. The calculated weight of AA inserted on MPG and MPGO after photolysis was 22.30% and 18.08%, respectively, with respect to the initial weight of carbon, when the initial concentration of AA was 60 mg∙L-1. AA immobilized on MPG was active while the enzyme on MPGO showed a smaller activity, within the experimental error. Although a certain extent of denaturalization of both proteins was observed during photolysis, the molecular weight and composition changed very little during the photolysis, which would produce mainly conformational changes and isomerization reactions.
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Affiliation(s)
- Eduardo Humeres
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil.
| | - Moisés Canle
- Universidade da Coruña, Grupo Reactividade Química e Fotorreactividade (React!), Departamento de Química, Facultade de Ciencias & CICA, E-15071 A Coruña, Spain
| | - Cristiane Nunes Lopes
- Departamento de Engenharia Química e de Alimentos, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - J Arturo Santaballa
- Universidade da Coruña, Grupo Reactividade Química e Fotorreactividade (React!), Departamento de Química, Facultade de Ciencias & CICA, E-15071 A Coruña, Spain
| | - Nito Angelo Debacher
- Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Regina de F P M Moreira
- Departamento de Engenharia Química e de Alimentos, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Vladimir Safin
- Universidade da Coruña, Grupo Reactividade Química e Fotorreactividade (React!), Departamento de Química, Facultade de Ciencias & CICA, E-15071 A Coruña, Spain; Department of Chemistry and Technology of Natural Energy Carriers and Carbon Materials, Siberian Federal University, Russia
| | - M Isabel Fernández Pérez
- Universidade da Coruña, Grupo Reactividade Química e Fotorreactividade (React!), Departamento de Química, Facultade de Ciencias & CICA, E-15071 A Coruña, Spain
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22
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Mathon B, Coquery M, Miège C, Vandycke A, Choubert JM. Influence of water depth and season on the photodegradation of micropollutants in a free-water surface constructed wetland receiving treated wastewater. Chemosphere 2019; 235:260-270. [PMID: 31260866 DOI: 10.1016/j.chemosphere.2019.06.140] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 05/29/2019] [Accepted: 06/17/2019] [Indexed: 06/09/2023]
Abstract
Micropollutants such as pharmaceutical products and pesticides are still present in treated wastewater. Several of these compounds are photoactive, either by direct or indirect photodegradation. An innovative on-site experimental protocol was designed to investigate the contribution of photodegradation processes to eliminate micropolluants in constructed wetland (CW). The solar photodegradation of 23 organic micropollutants was studied using in situ photoreactors at different depths. A CW-photodegradation model was designed and calibrated to further scrutinize the contribution of direct and indirect photodegradation processes in the elimination of micropollutants. The results show that photodegradation is most effective in the first 10 cm of the water column. A classification of micropollutants in 3 groups was developed to characterize their photodegradation. A significant increase of the half-life by direct photodegradation was observed in winter compared to summer due to a lower light intensity in winter. On the opposite, for direct + indirect photodegradation, no significant difference was observed between seasons. The decrease in light intensity in winter was compensated by higher nitrates concentration which promoted the formation of hydroxyl radicals and increased indirect photodegradation. The CW-photodegradation model successfully simulated the measured concentrations for direct and indirect photodegradation for 23 micropolluants. Nonetheless, it overestimated the indirect photodegradation with hydroxyl radicals when using default parameter values derived for surface waters. Hence, the consumption of hydroxyl radicals was increased by a factor of 20 for treated water. This model highlighted the predominance of direct photodegradation in the elimination of all micropollutants, except sotalol for the winter campaign.
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Affiliation(s)
- B Mathon
- Irstea, UR REVERSAAL, 5 rue de la Doua, CS 20244, F-69625, Villeurbanne Cedex, France; Irstea, UR RiverLy, F-69625, Villeurbanne Cedex, France
| | - M Coquery
- Irstea, UR RiverLy, F-69625, Villeurbanne Cedex, France
| | - C Miège
- Irstea, UR RiverLy, F-69625, Villeurbanne Cedex, France
| | - A Vandycke
- Irstea, UR REVERSAAL, 5 rue de la Doua, CS 20244, F-69625, Villeurbanne Cedex, France
| | - J-M Choubert
- Irstea, UR REVERSAAL, 5 rue de la Doua, CS 20244, F-69625, Villeurbanne Cedex, France.
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Abstract
We describe cyclic peptide progelators which cleave in response to UV light to generate linearized peptides which then self-assemble into gel networks. Cyclic peptide progelators were synthesized, where the peptides were sterically constrained, but upon UV irradiation, predictable cleavage products were generated. Amino acid sequences and formulation conditions were altered to tune the mechanical properties of the resulting gels. Characterization of the resulting morphologies and chemistry was achieved through liquid phase and standard TEM methods, combined with matrix assisted laser desorption ionization imaging mass spectrometry (MALDI-IMS).
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Affiliation(s)
- Andrea S Carlini
- Department of Chemistry & Biochemistry, University of California San Diego, La Jolla, California 92093, USA.
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Thorn KA. 13C and 15N NMR identification of product compound classes from aqueous and solid phase photodegradation of 2,4,6-trinitrotoluene. PLoS One 2019; 14:e0224112. [PMID: 31639172 PMCID: PMC6804990 DOI: 10.1371/journal.pone.0224112] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 10/04/2019] [Indexed: 11/18/2022] Open
Abstract
Photolysis is one of the main transformation pathways for 2,4,6-trinitrotoluene (TNT) released into the environment. Upon exposure to sunlight, TNT is known to undergo both oxidation and reduction reactions with release of nitrite, nitrate, and ammonium ions, followed by condensation reactions of the oxidation and reduction products. In this study, compound classes of transformation products from the aqueous and solid phase photodegradation of 2,4,6-trinitrotoluene (TNT) have been identified by liquid and solid state 13C and 15N NMR. Aqueous phase experiments were performed on saturated solutions of T15NT in deionized water, natural pond water (pH = 8.3, DOC = 3.0 mg/L), pH 8.0 buffer solution, and in the presence of Suwannee River Natural Organic Matter (SRNOM; pH = 3.7), using a Pyrex-filtered medium pressure mercury lamp. Natural sunlight irradiations were performed on TNT in the solid phase and dissolved in the pond water. In deionized water, carboxylic acid, aldehyde, aromatic amine, primary amide, azoxy, nitrosophenol, and azo compounds were formed. 15N NMR spectra exhibited major peaks centered at 128 to 138 ppm, which are in the range of phenylhydroxylamine and secondary amide nitrogens. The secondary amides are proposed to represent benzanilides, which would arise from photochemical rearrangement of nitrones formed from the condensation of benzaldehyde and phenylhydroxylamine derivatives of TNT. The same compound classes were formed from sunlight irradiation of TNT in the solid phase. Whereas carboxylic acids, aldehydes, aromatic amines, phenylhydroxylamines, and amides were also formed from irradiation of TNT in pond water and in pH 8 buffer solution, azoxy and azo compound formation was inhibited. Solid state 15N NMR spectra of photolysates from the lamp irradiation of unlabeled 2,6-dinitrotoluene in deionized water also demonstrated the formation of aromatic amine, phenylhydroxylamine/ 2° amide, azoxy, and azo nitrogens.
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Affiliation(s)
- Kevin A. Thorn
- U.S. Geological Survey, Denver Federal Center, Denver, Colorado, United States of America
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25
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Samuel MS, Jose S, Selvarajan E, Mathimani T, Pugazhendhi A. Biosynthesized silver nanoparticles using Bacillus amyloliquefaciens; Application for cytotoxicity effect on A549 cell line and photocatalytic degradation of p-nitrophenol. J Photochem Photobiol B 2019; 202:111642. [PMID: 31734434 DOI: 10.1016/j.jphotobiol.2019.111642] [Citation(s) in RCA: 86] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 08/22/2019] [Accepted: 10/01/2019] [Indexed: 11/20/2022]
Abstract
The present study reports the biosynthesis of silver nanoparticles (AgNPs) using Bacillus amyloliquefaciens MSR5. The cellfree supernatant of B. amyloliquefaciens acted as a stabilizing agent for the synthesis of AgNPs. The synthesized AgNPs were characterized using UV-vis spectrophotometer, PXRD, FTIR, SEM-EDX, DLS, and TEM. TEM image showed the spherical shape of the biosynthesized AgNPs and it was found to be 20-40 nm in range. In this study, the AgNPs were prepared by ultrasonic irradiation. The stability of the AgNPs was found to be -33.4 mV using zeta potential. The catalytic 4-nitrophenol (4-NP) degradation by AgNPs was examined under solar irradiation and furthermore, the effects of several degradation parameters were studied. The biosynthesized AgNPs exhibited a strong chemocatalytic action with a comprehensive degradation (98%) of 4-NP to 4-aminophenol (4-AP) using NaBH4 within 15 min. In addition, MTT assay was performed to evaluate the cytotoxicity of the biosynthesized AgNPs (10 - 200 μg). The results have shown that the AgNPs exhibited significant activity on A549 cells, which was dosedependent. The study elucidates the AgNPs synthesized using cellfree culture supernatant can be used for the elimination of hazardous pollutants from wastewater.
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Affiliation(s)
- Melvin S Samuel
- Department of Materials Science and Engineering, CEAS, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, United States
| | - Sujin Jose
- School of Physics, Madurai Kamaraj University, Madurai, Tamil Nadu, India
| | - E Selvarajan
- Department of Genetic Engineering, School of Bioengineering, SRM Institute of Science and Technology, Kattankulathur 603 203, India
| | - Thangavel Mathimani
- Department of Energy and Environment, National Institute of Technology, Tiruchirappalli 620 015, Tamil Nadu, India
| | - Arivalagan Pugazhendhi
- Innovative Green Product Synthesis and Renewable Environment Development Research Group, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam.
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Kocaman E, Ozhan K. Degradation of Bisphenol A in Natural and Artificial Marine and Freshwaters in Turkey. Bull Environ Contam Toxicol 2019; 103:496-500. [PMID: 31312855 DOI: 10.1007/s00128-019-02680-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 07/09/2019] [Indexed: 06/10/2023]
Abstract
Bisphenol A (BPA), one of the important synthetic chemicals, has been produced at high volumes since the 1960s. These chemicals are commonly detected in the marine and freshwater environments; however, their transformation in aquatic environments depends on many parameters. This study aims to investigate the degradation of BPA in marine and freshwaters under different conditions in terms of microbial degradation, photodegradation, and temperature effect. The results showed that BPA content in samples prepared from the artificial waters did not change significantly in 150 days. BPA concentrations in natural river water started to degrade after day 50, and the degradation rate was faster for the samples at 25°C than ones at 4°C. In natural seawater samples, there was no degradation detected in 150 days at 4°C and 25°C. However, samples prepared in natural seawater, kept outside, and exposed to over 40°C temperature showed degradation after day 50. A treatment exposed to the sunlight showed a higher degradation rate, indicating the additive/synergistic role of the photodegradation. Our study suggests that high temperatures ( > 25°C) are required for BPA degradation in seawater. River water is more potent than seawater for BPA degradation. It is suggested that BPA contamination in a marine environment could be more persistent than in a freshwater environment.
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Affiliation(s)
- Emel Kocaman
- Institute of Marine Sciences, Middle East Technical University, Erdemli, Mersin, Turkey.
| | - Koray Ozhan
- Institute of Marine Sciences, Middle East Technical University, Erdemli, Mersin, Turkey.
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Sun H, Wang M, Nan Y, Han M, Lu H. The Kinetics and Mechanisms for Photodegradation of Nitrated Polycyclic Aromatic Hydrocarbons on Lettuce Leaf Surfaces: An In Vivo Study. J Agric Food Chem 2019; 67:8452-8458. [PMID: 31294967 DOI: 10.1021/acs.jafc.9b02326] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Insights into the environmental fates of nitrated polycyclic aromatic hydrocarbons (NPAHs) in edible vegetables are of great significance for better evaluating human exposure to NPAHs through the dietary pathway. In this work, a fluorescence quenching method using graphene quantum dots as a fluorescent probe was first applied for the in vivo determination of 9-nitroanthracene (9-NAnt) and 1-nitropyrene (1-NPyr) adsorbed on the leaf surfaces of living lettuce (Lactuca sativa L.) seedlings. Moreover, the photolysis kinetics and mechanisms of the two adsorbed NPAHs were discussed. The photodegradation kinetics followed the pseudo-first-order equation, and the photodegradation half-life of 1-NPyr (7.4 ± 0.2 h) was greater than that of 9-NAnt (2.3 ± 0.1 h). Anthraquinone and pyrenediones were identified to be the main photolytic products of 9-NAnt and 1-NPyr, respectively. Intramolecular rearrangement was the most reasonable mechanism for the NPAH photolysis. The photolysis-driven degradation exhibited a key role in scavenging NPAHs from the vegetable leaf, indicating the reduction of NPAH transportation in the food chain.
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Affiliation(s)
- Haifeng Sun
- College of Environment and Resource , Shanxi University , Taiyuan 030006 , P. R. China
- Key Laboratory of Soil Environment and Nutrient Resources of Shanxi Province , Taiyuan 030031 , P. R. China
| | - Meng Wang
- College of Environment and Resource , Shanxi University , Taiyuan 030006 , P. R. China
| | - Yanli Nan
- College of Environment and Resource , Shanxi University , Taiyuan 030006 , P. R. China
| | - Ming Han
- College of Environment and Resource , Shanxi University , Taiyuan 030006 , P. R. China
| | - Haoliang Lu
- Key Laboratory of Ministry of Coastal and Wetland Ecosystem , Xiamen University , Xiamen 361102 , P. R. China
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28
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Khaled A, Sleiman M, Darras E, Trivella A, Bertrand C, Inguimbert N, Goupil P, Richard C. Photodegradation of Myrigalone A, an Allelochemical from Myrica gale: Photoproducts and Effect of Terpenes. J Agric Food Chem 2019; 67:7258-7265. [PMID: 31188589 DOI: 10.1021/acs.jafc.9b01722] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
This study investigated the environmental fate of myrigalone A, a light absorbing natural herbicide found on leaves and fruits of Myrica gale. Myrigalone A was irradiated in water and as a dry solid deposit to simulate reactions on leaves, alone and in the presence of the terpenes generated by Myrica gale. The phototransformation was fast ( t1/2 = 35 min in water). Analyses by liquid chromatography coupled to high resolution orbitrap electrospray mass spectrometry (MS) and gas chromatography-MS revealed the formation of 11 photoproducts in water and solid and 9 in gaseous phase. Some were detected in the leaf glands and oil covering the fruits of Myrica gale, which suggested that photodegradation occurred in the field. Moreover, myrigalone A photoinduced the oxidation of terpenes that in turn protected it against photolysis. This highlights the need for additional research on the effect of terpenes on the photodegradation of pesticides on vegetation.
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Affiliation(s)
- Amina Khaled
- CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand , Université Clermont Auvergne , F-63000 Clermont-Ferrand , France
| | - Mohamad Sleiman
- CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand , Université Clermont Auvergne , F-63000 Clermont-Ferrand , France
| | - Etienne Darras
- CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand , Université Clermont Auvergne , F-63000 Clermont-Ferrand , France
| | - Aurélien Trivella
- UMR CNRS 5805 EPOC - OASU, Equipe LPTC, IUT de Périgueux , Rue du Doyen Lajugie , 24000 Périgueux , France
| | - Cédric Bertrand
- USR 3278 CRIOBE, PSL Research University, EPHE-UPVD-CNRS, Université de Perpignan Via Domitia, Laboratoire d'Excellence ≪ CORAIL ≫ , Bâtiment T, 58 avenue P. Alduy , 66860 Perpignan , France
- AkiNaO SAS , F-66860 Perpignan , France
| | - Nicolas Inguimbert
- USR 3278 CRIOBE, PSL Research University, EPHE-UPVD-CNRS, Université de Perpignan Via Domitia, Laboratoire d'Excellence ≪ CORAIL ≫ , Bâtiment T, 58 avenue P. Alduy , 66860 Perpignan , France
| | - Pascale Goupil
- INRA, PIAF , Université Clermont Auvergne , F-63000 Clermont-Ferrand , France
| | - Claire Richard
- CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand , Université Clermont Auvergne , F-63000 Clermont-Ferrand , France
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29
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Żądło AC. Application of transition metal ions in a study of photoinduced modifications of melanin. Acta Biochim Pol 2019; 66:237-241. [PMID: 31095651 DOI: 10.18388/abp.2018_2802] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Accepted: 04/26/2019] [Indexed: 11/10/2022]
Abstract
Short wavelength visible light is viewed as the main agent responsible for oxidative modification of melanin in the human retinal pigment epithelium (RPE). The aim of this research was to study light-induced modifications of melanin using iron and zinc as molecular probes. A synthetic model of eumelanin was treated by intense violet light. The interaction of melanin with metal ions was examined by electron paramagnetic resonance (EPR) spectroscopy and a thiocyanate assay. Weak photodegradation of melanin was shown to increase exposure of melanin subunits, while stronger photodegradation caused a loss of melanin subunits. Iron-binding in such melanin was weak and nonspecific.
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Affiliation(s)
- Andrzej Czesław Żądło
- Department of Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków, Poland
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30
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Huang Y, Wu Z, Lui H, Zhao J, Xie S, Zeng H. Precise closure of single blood vessels via multiphoton absorption-based photothermolysis. Sci Adv 2019; 5:eaan9388. [PMID: 31106263 PMCID: PMC6520027 DOI: 10.1126/sciadv.aan9388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 04/02/2019] [Indexed: 06/09/2023]
Abstract
We report a novel approach to selectively close single blood vessels within tissue using multiphoton absorption-based photothermolysis (multiphoton photothermolysis) without the need of exogenous agents. The treatment process is monitored by in vivo reflectance confocal microscopy in real time. Closure of single targeted vessels of varying sizes ranging from capillaries to venules was demonstrated. We also demonstrated that deeply situated blood vessels could be closed precisely while preserving adjacent overlying superficial blood vessels. In vivo confocal Raman spectroscopy of the treatment sites confirmed vessel closure as being mediated by local coagulative damage. Partial vessel occlusion could be achieved, and it is accompanied by increased intravascular blood cell speed. Multiphoton photothermolysis under real-time reflectance confocal imaging guidance provides a novel precision medicine approach for noninvasive, precise microsurgery treatment of vascular diseases on a per-vessel/per-lesion basis. The method could also be used for building ischemic stroke models for basic biology study.
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Affiliation(s)
- Yimei Huang
- Imaging Unit, Integrative Oncology Department, BC Cancer Research Center, Vancouver, BC V5Z 1L3, Canada
- Photomedicine Institute, Department of Dermatology and Skin Science, University of British Columbia and Vancouver Coastal Health Research Institute, Vancouver, BC V5Z 4E8, Canada
- Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory of Photonics Technology, College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou 350007, China
| | - Zhenguo Wu
- Imaging Unit, Integrative Oncology Department, BC Cancer Research Center, Vancouver, BC V5Z 1L3, Canada
- Photomedicine Institute, Department of Dermatology and Skin Science, University of British Columbia and Vancouver Coastal Health Research Institute, Vancouver, BC V5Z 4E8, Canada
| | - Harvey Lui
- Imaging Unit, Integrative Oncology Department, BC Cancer Research Center, Vancouver, BC V5Z 1L3, Canada
- Photomedicine Institute, Department of Dermatology and Skin Science, University of British Columbia and Vancouver Coastal Health Research Institute, Vancouver, BC V5Z 4E8, Canada
| | - Jianhua Zhao
- Imaging Unit, Integrative Oncology Department, BC Cancer Research Center, Vancouver, BC V5Z 1L3, Canada
- Photomedicine Institute, Department of Dermatology and Skin Science, University of British Columbia and Vancouver Coastal Health Research Institute, Vancouver, BC V5Z 4E8, Canada
| | - Shusen Xie
- Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory of Photonics Technology, College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou 350007, China
| | - Haishan Zeng
- Imaging Unit, Integrative Oncology Department, BC Cancer Research Center, Vancouver, BC V5Z 1L3, Canada
- Photomedicine Institute, Department of Dermatology and Skin Science, University of British Columbia and Vancouver Coastal Health Research Institute, Vancouver, BC V5Z 4E8, Canada
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31
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Khadgi N, Upreti AR. Photocatalytic degradation of Microcystin-LR by visible light active and magnetic, ZnFe 2O 4-Ag/rGO nanocomposite and toxicity assessment of the intermediates. Chemosphere 2019; 221:441-451. [PMID: 30654258 DOI: 10.1016/j.chemosphere.2019.01.046] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 12/22/2018] [Accepted: 01/06/2019] [Indexed: 06/09/2023]
Abstract
In this work, we aimed to study photocatalytic degradation of Microcystin-LR (MC-LR), a cyanotoxin known to cause acute as well as chronic toxicity and even mortality. The nanocomposite (NC) based on zinc ferrite (ZnFe2O4) was modified with graphene oxide (GO) and Ag nanoparticles (NPs) to enhance its photocatalytic properties under visible light. The so-formed ZnFe2O4-Ag/rGO NC exhibited superior performance in visible light allowing complete degradation of MC-LR within 120 min of treatment with pseudo rate constant, k = 0.0515 min-1, several times greater than other photocatalysts, TiO2 (k = 0.0009 min-1), ZnFe2O4 (k = 0.0021 min-1), ZnFe2O4-Ag (k = 0.0046 min-1) and ZnFe2O4/rGO (k = 0.007 min-1) respectively. The total organic carbon analysis revealed that only 22% of MC-LR was mineralized on 120 min of treatment time indicating presence of different intermediate by-products. The intermediates formed during photocatalytic treatment were identified using liquid chromatography-mass spectrometry (LCMS) based on which probable degradation pathways were proposed. The attack from OH radicals formed during the photocatalytic process resulted to hydroxylation and subsequent cleavage of diene bond. The toxicity assessment with Daphnia magna revealed that the degradation process has alleviated toxicity of the MC-LR and no toxic intermediates were formed during the treatment which is very important from eco-toxicological view point. Therefore, ZnFe2O4-Ag/rGO has a good potential in the field of environmental applications as visible light active and magnetic photocatalyst with enhanced performance.
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Affiliation(s)
- Nirina Khadgi
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing, 210098, PR China.
| | - Akhanda Raj Upreti
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing, 210098, PR China
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32
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Wang W, Aregahegn KZ, Andersen ST, Ni AZ, Rohrbacher AF, Nielsen OJ, Finlayson-Pitts BJ. Quantum Yields and N 2O Formation from Photolysis of Solid Films of Neonicotinoids. J Agric Food Chem 2019; 67:1638-1646. [PMID: 30698961 DOI: 10.1021/acs.jafc.8b05417] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Neonicotinoids (NN), first introduced in 1991, are found on environmental surfaces where they undergo photolytic degradation. Photolysis studies of thin films of NN were performed using two approaches: (1) transmission FTIR, in which solid films of NN and the gas-phase products were analyzed simultaneously, and (2) attenuated-total-reflectance FTIR combined with transmission FTIR, in which solid films of NN and the gas-phase products were probed in the same experiment but not at the same time. Photolysis quantum yields using broadband irradiation centered at 313 nm were (2.2 ± 0.9) × 10-3 for clothianidin (CLD), (3.9 ± 0.3) × 10-3 for thiamethoxam (TMX), and (3.3 ± 0.5) × 10-3 for dinotefuran (DNF), with all errors being ±1 s. At 254 nm, which was used to gain insight into the wavelength dependence, quantum yields were in the range of (0.8-20) × 10-3 for all NNs, including acetamiprid (ACM) and thiacloprid (TCD). Nitrous oxide (N2O), a potent greenhouse gas, was the only gas-phase product detected for the photolysis of nitroguanidines, with yields of ΔN2O/ΔNN > 0.5 in air at both 313 and 254 nm. The atmospheric lifetimes with respect to photolysis for CLD, TMX, and DNF, which absorb light in the actinic region, are estimated to be 15, 10, and 11 h, respectively, at a solar zenith angle of 35° and 12, 8, and 10 h at a solar zenith angle of 15°.
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Affiliation(s)
- Weihong Wang
- Department of Chemistry , University of California, Irvine , Irvine , California 92697-2025 , United States
| | - Kifle Z Aregahegn
- Department of Chemistry , University of California, Irvine , Irvine , California 92697-2025 , United States
- Department of Chemistry , Debre Berhan University , P.O. Box 445, Debre Berhan , Ethiopia
| | - Simone T Andersen
- Department of Chemistry , University of California, Irvine , Irvine , California 92697-2025 , United States
- Copenhagen Center for Atmospheric Research, Department of Chemistry , University of Copenhagen , 2100 Copenhagen Ø , Denmark
| | - Anton Z Ni
- Department of Chemistry , University of California, Irvine , Irvine , California 92697-2025 , United States
| | - Andrea F Rohrbacher
- Department of Chemistry , University of California, Irvine , Irvine , California 92697-2025 , United States
| | - Ole John Nielsen
- Copenhagen Center for Atmospheric Research, Department of Chemistry , University of Copenhagen , 2100 Copenhagen Ø , Denmark
| | - Barbara J Finlayson-Pitts
- Department of Chemistry , University of California, Irvine , Irvine , California 92697-2025 , United States
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33
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Mayer BK, Johnson C, Yang Y, Wellenstein N, Maher E, McNamara PJ. From micro to macro-contaminants: The impact of low-energy titanium dioxide photocatalysis followed by filtration on the mitigation of drinking water organics. Chemosphere 2019; 217:111-121. [PMID: 30414543 DOI: 10.1016/j.chemosphere.2018.10.213] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 10/27/2018] [Accepted: 10/29/2018] [Indexed: 05/24/2023]
Abstract
This study evaluated strategies targeting macro- and micro-organic contaminant mitigation using low-energy titanium dioxide photocatalysis. Energy inputs of 1, 2, and 5 kWh m-3 resulted in incomplete oxidation of macro-organic natural organic matter, signified by greater reductions of UV254 and specific ultraviolet UV absorbance (SUVA) in comparison to dissolved organic carbon (DOC). The rate of UV254 removal was 3 orders of magnitude greater than the rate of DOC degradation. Incomplete oxidation improved operation of downstream filtration processes. Photocatalysis at 2 kWh m-3 increased the bed life of downstream granular activated carbon (GAC) filtration by 340% relative to direct filtration pretreatment. Likewise, photocatalysis operated ahead of microfiltration decreased fouling, resulting in longer filter run times. Using 2 kWh m-3 photocatalysis increased filter run time by 36 times in comparison to direct filtration. Furthermore, levels of DOC and UV254 in the membrane permeate improved (with no change in removal across the membrane) using low-energy photocatalysis pretreatments. While high-energy UV inputs provided high levels of removal of the estrogenic micro-organics estrone (E1), 17β-estradiol (E2), estriol (E3), and 17α-ethynlestradiol (EE2), low-energy photocatalysis did not enhance removal of estrogens beyond levels achieved by photolysis alone. In the cases of E1 and E3, the addition of TiO2 as a photocatalyst reduced degradation rates of estrogens compared to UV photolysis. Overall, process electrical energy per order magnitude reductions (EEOs) greatly improved using photocatalysis, versus photolysis, for the macro-organics DOC, UV254, and SUVA; however, energy required for removal of estrogens was similar between photolysis and photocatalysis.
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Affiliation(s)
- Brooke K Mayer
- Department of Civil, Construction and Environmental Engineering, Marquette University, USA.
| | - Carlan Johnson
- Department of Civil, Construction and Environmental Engineering, Marquette University, USA
| | - Yu Yang
- Department of Civil, Construction and Environmental Engineering, Marquette University, USA
| | - Nicole Wellenstein
- Department of Civil, Construction and Environmental Engineering, Marquette University, USA
| | - Emily Maher
- Department of Civil, Construction and Environmental Engineering, Marquette University, USA
| | - Patrick J McNamara
- Department of Civil, Construction and Environmental Engineering, Marquette University, USA
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Scott T, Zhao H, Deng W, Feng X, Li Y. Photocatalytic degradation of phenol in water under simulated sunlight by an ultrathin MgO coated Ag/TiO 2 nanocomposite. Chemosphere 2019; 216:1-8. [PMID: 30359911 DOI: 10.1016/j.chemosphere.2018.10.083] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2018] [Revised: 10/03/2018] [Accepted: 10/13/2018] [Indexed: 06/08/2023]
Abstract
Phenol is one of the most widespread, toxic and recalcitrant compounds in water sources. Due to its persistent nature, conventional wastewater treatment methods are not effective to remove or degrade phenol from water. In this work, novel photocatalysts were developed to effectively degrade phenol under simulated sunlight. The catalysts were composed of one-dimensional titanium dioxide (TiO2) nanorods decorated with silver (Ag) nanoparticles, coated by an ultrathin magnesium oxide (MgO) overlayer through atomic layer deposition (ALD). Material properties of prepared catalysts were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-vis diffuse reflectance spectroscopy (UV-Vis DRS). The photocatalytic performance of phenol degradation under simulated sunlight was evaluated and correlated with the material properties. The Ag nanoparticles promoted light absorption and transfer of photo-induced electron-hole pairs from within TiO2 nanorods to the catalyst surface. The ultrathin MgO overlayer with a sub-nanometer thickness did not hinder charge transfer to the surface, but rather, it further increased the light absorption and inhibited surface charge recombination through a surface passivation effect, promoting phenol degradation. The photocatalytic reaction mechanism was investigated by examining hydroxyl and superoxide radical production in the photocatalytic system. The results from this work demonstrated a new strategy for fabricating efficient solar-driven photocatalysts for the degradation of persistent water contaminants.
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Affiliation(s)
- Tyler Scott
- Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Huilei Zhao
- Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Wei Deng
- Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Xuhui Feng
- Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Ying Li
- Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843, USA.
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Zukawa T, Sasaki Y, Kurosawa T, Kamiko N. Photolysis of Indigo Carmine solution by planar vacuum-ultraviolet (147 nm) light source. Chemosphere 2019; 214:123-129. [PMID: 30261418 DOI: 10.1016/j.chemosphere.2018.09.102] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 09/16/2018] [Accepted: 09/17/2018] [Indexed: 06/08/2023]
Abstract
Advanced oxidation processes (AOPs) are an attractive method to decompose dye-containing wastewaters, because they avoid issues of secondary pollution. In particular, a vacuum-ultraviolet (VUV) process is the simplest method, because an oxidation accelerator or a catalyst is not required. Conventional VUV sources with wavelengths of 185 nm or 172 nm have been used. We predicted that a shorter wavelength VUV process would have a higher ability to decompose dyes in wastewater. We developed a new planar light source that could emit a resonance line at 147 nm and a broad molecular line at 172 nm. The irradiance was 8.7 mW/cm2 at a distance of 20 mm from the emission surface to the UV power meter. We then conducted photocatalytic experiments of an Indigo Carmine solution at 3.33 × 10-4 mol/L to confirm the decomposition abilities of the developed light source, an excimer lamp of 172 nm and a Hg lamp of 254 nm. From the HPLC results, changes in Indigo Carmine concentration with the developed light source were equivalent to those with the excimer lamp. However, the residual ratio of total organic carbon (TOC) with the developed light source was lower than those with the other lamps. Therefore, a wavelength of 147 nm is superior to the conventional wavelength of 172 nm for Indigo Carmine decomposition. In addition, the developed light source emits VUV from only one side, which is a flat emitting surface. Consequently, the developed light source would have reduced manufacturing and maintenance costs compared to current VUV processing equipment.
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Affiliation(s)
- Takehiro Zukawa
- Tech. Innovation Div., Panasonic Co., Ltd, Japan; Col. of Sci. & Eng., Ritsumeikan Univ, Japan.
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36
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Liu X, Huang L, Wu X, Wang Z, Dong G, Wang C, Liu Y, Wang L. Bi 2Zr 2O 7 nanoparticles synthesized by soft-templated sol-gel methods for visible-light-driven catalytic degradation of tetracycline. Chemosphere 2018; 210:424-432. [PMID: 30025359 DOI: 10.1016/j.chemosphere.2018.07.040] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 07/04/2018] [Accepted: 07/09/2018] [Indexed: 06/08/2023]
Abstract
Tetracycline (TC), an antibiotic, is persistent in nature and frequently detected in water and sediments. Visible-light-driven photocatalyst for TC degradation is a promising environmental-friendly technology. Bi2Zr2O7, an effective photocatalyst, but no studies on its photodegradation of TC could be found in literature. In this study, Bi2Zr2O7 was synthesized by three soft templated sol-gel methods. Three synthesized Bi2Zr2O7 catalysts have different structures, morphologies and band gaps. The Bi2Zr2O7 nanoparticles synthesized with citric acid as the template (BZO-3) had a larger specific surface area (30.7 m2/g) and a narrower band gap (2.39 eV), and exhibited a better performance for TC degradation under visible light with an efficiency of up to 81.3%. They also exhibited good stability and reusability in recycled experiments. A reaction mechanism of TC degradation by these photocatalyst was proposed. The enhanced photocatalytic performance was mainly due to photogenerated holes of reactive species and TC was mainly degraded on the surface of the photocatalyst. Pathways of TC photodegradation were derived from the result of analyses of the reaction intermediates. In conclusion, Bi2Zr2O7 nanoparticles were found effective as photocatalyst for TC photodegradation by visible light.
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Affiliation(s)
- Xiaowei Liu
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
| | - Lihui Huang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
| | - Xueyuan Wu
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
| | - Zexiang Wang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
| | - Guihua Dong
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
| | - Chuang Wang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
| | - Yangyang Liu
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
| | - Lisha Wang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan, 250100, China.
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Abstract
SiO 2 and carbon produced by kraft lignin pyrolyzed at 600°C can generate stable reactive oxygen species (ROS) by reaction with atmospheric oxygen. In this study, we systematically investigate the photochemistry of peroxyl radicals in carbon-supported silica (PCS) and assess its effects on the methylene blue (MB) photodegradation. Characterization revealed that the higher ROS generation ability of SiO 2/carbon under UV light irradiation was attributed to its abundant photoactive surface-oxygenated functional groups.
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38
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Yenjai S, Kumar CV, Kuno M, Liwporncharoenvong T, Samosorn S, Buranaprapuk A. Tuning the chain length of new pyrene derivatives for site-selective photocleavage of avidin. J Photochem Photobiol B 2018; 186:23-30. [PMID: 29990670 DOI: 10.1016/j.jphotobiol.2018.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Revised: 06/08/2018] [Accepted: 07/02/2018] [Indexed: 06/08/2023]
Abstract
Rational design of photoreagents with systematic modifications of their structures can provide valuable information for a better understanding of the protein photocleavage mechanism by these reagents. Variation of the length of the linker connecting the photoactive moiety with the protein anchoring-group allowed us to investigate the control of the protein photocleavage site. A series of new photochemical reagents (PMA-1A, PMA-2A and PMA-3A) with increasing chain lengths is examined in the current study. Using avidin as a model system, we examined the interaction of these probes by UV-Vis, fluorescence spectroscopic methods, photocleavage and computational docking studies. Hypochromism of the absorption spectrum was observed for the binding of these new photochemical reagents with estimated binding constants (Kb) of 6.2 × 105, 6.7 × 105 and 4.6 × 105 M-1, respectively. No significant changes of Stern-Volmer quenching constant (Ksv) with Co(NH3)6Cl3 has been noted and the data indicated that the probes bind near the surface of the protein with sufficient exposure to the solvent. Photoexcitation of the probe-avidin complex, in the presence of Co(NH3)6Cl3, resulted in protein fragmentation, and the cleavage yield decreased with the increase in the linker length, and paralleled with the observed Ksv values. Amino acid sequencing of the photofragments indicated that avidin is cleaved between Thr77 and Val78, as a major cleavage site for all the three photoreagents. This site is proximate to the biotin binding site on avidin, and molecular docking studies indicated that the H-bonding interactions between the polar end-group of the photoreagents and hydrophilic amino acids of avidin were important in positioning the reagent on the protein. The major cleavage site, at residues 77-78, was within 5 Å of the pyrenyl moiety of the probe, and hence, molecular tuning of the linker provided a simple approach to position the photoreagent along the potential photocleavage site.
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Affiliation(s)
- Sudarat Yenjai
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Bangkok 10110, Thailand
| | - Challa V Kumar
- Department of Chemistry, 55 N. Eagleville Road, University of Connecticut, Storrs, CT 06269-3060, USA; Department of Molecular and Cellular Biology, 91 N. Eagleville Road, U-3125, University of Connecticut, Storrs, CT 06269-3125, USA
| | - Mayuso Kuno
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Bangkok 10110, Thailand
| | | | - Siritron Samosorn
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Bangkok 10110, Thailand
| | - Apinya Buranaprapuk
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Bangkok 10110, Thailand.
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Adachi T, Suzuki Y, Nishiyama M, Kodaka R, Fujisawa T, Katagi T. Photodegradation of Strobilurin Fungicide Mandestrobin in Water. J Agric Food Chem 2018; 66:8514-8521. [PMID: 30049214 DOI: 10.1021/acs.jafc.8b03610] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Photodegradation of a new strobilurin fungicide, mandestrobin, was investigated in buffered aqueous solution and synthetic humic water (SHW) under continuous irradiation with artificial sunlight (λ > 290 nm). In both aquatic media, the direct photolysis preferentially proceeded via homolytic bond cleavage at the benzyl phenyl ether, and the subsequent recombination of geminate radicals in a solvent cage gave the photo-Claisen rearrangement products. A radical mechanism in the photochemical rearrangement was strongly supported by a radical-trapping technique using a novel nitroxide spin label combined with electron spin resonance (ESR) and liquid chromatography-mass spectrometry (LC-MS) analyses. Photosensitized generation of hydroxyl radical in SHW might significantly contribute to enhancing the formation of a benzyl alcohol derivative. The series of photolysis products steadily degraded and finally mineralized to carbon dioxide.
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Affiliation(s)
- Takeshi Adachi
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 4-2-1 Takatsukasa , Takarazuka , Hyogo 665-8555 , Japan
| | - Yusuke Suzuki
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 4-2-1 Takatsukasa , Takarazuka , Hyogo 665-8555 , Japan
| | - Masahiro Nishiyama
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 3-1-98 Kasugadenaka , Konohana-ku, Osaka 554-8558 , Japan
| | - Rika Kodaka
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 4-2-1 Takatsukasa , Takarazuka , Hyogo 665-8555 , Japan
| | - Takuo Fujisawa
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 4-2-1 Takatsukasa , Takarazuka , Hyogo 665-8555 , Japan
| | - Toshiyuki Katagi
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 3-1-98 Kasugadenaka , Konohana-ku, Osaka 554-8558 , Japan
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40
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Williams KL, Kaur R, McFall AS, Kalbfleisch J, Gladfelder JJ, Ball DB, Anastasio C, Tjeerdema RS. Aqueous Photolysis of Benzobicyclon Hydrolysate. J Agric Food Chem 2018; 66:5462-5472. [PMID: 29754487 DOI: 10.1021/acs.jafc.8b01012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Benzobicyclon [3-(2-chloro-4-(methylsulfonyl)benzoyl)-2-phenylthiobicyclo[3.2.1]oct-2-en-4-one] is a pro-herbicide used against resistant weeds in California rice fields. Persistence of its active product, benzobicyclon hydrolysate, is of concern. As an acidic herbicide, the neutral species photolyzed faster than the more predominant anionic species ( t1/2 = 1 and 320 h, respectively; natural sunlight), from a >10-fold difference in the quantum yield. Dissolved organic matter in natural waters reduced direct photolysis and increased indirect photolysis compared to high-purity water. Light attenuation appears significant in rice field water and can slow photolysis. These results, used in the pesticides in flooded applications model with other experimental properties, indicate that a floodwater hold time of 20 days could be sufficient for dissipation of the majority of initial aqueous benzobicyclon hydrolysate prior to release. However, soil recalcitrance of both compounds will keep aqueous benzobicyclon hydrolysate levels constant months after benzobicyclon application.
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Affiliation(s)
| | | | | | - Jacob Kalbfleisch
- Department of Chemistry and Biochemistry , California State University , Physical Science Building, Room 216, Chico , California 95929 , United States
| | - Joshua J Gladfelder
- Department of Chemistry and Biochemistry , California State University , Physical Science Building, Room 216, Chico , California 95929 , United States
| | - David B Ball
- Department of Chemistry and Biochemistry , California State University , Physical Science Building, Room 216, Chico , California 95929 , United States
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41
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Abstract
Dicloran appears to be a model pesticide for investigating photodegradation processes in surface waters. Photodegradation processes are particularly relevant to this compound as it is applied to crops grown in proximity to freshwater and marine ecosystems. The photodegradation of dicloran under simulated sunlight was measured in distilled water, artificial seawater, phosphate buffer, and filter-sterilized estuarine water to determine its half-life, degradation rate, and photodegradation products. The half-life was approximately 7.5 h in all media. There was no significant difference in the rate of degradation between distilled water and artificial seawater for dicloran. For the intermediate products, a higher concentration of 2-chloro-1,4-benzoquinone was measured in artificial seawater versus distilled water, while a slightly higher concentration of 1,4-benzoquinone was measured in distilled water versus artificial seawater. The detection of chloride and nitrate ions after 2 h of light exposure suggests photonucleophilic substitution contributes to the degradation process. Differences in product distributions between water types suggest that salinity impacts on chemical degradation may need to be addressed in chemical exposure assessments.
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Affiliation(s)
- Emily N Vebrosky
- Department of Environmental Sciences, College of the Coast & Environment , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
| | - Parichehr Saranjampour
- Department of Environmental Sciences, College of the Coast & Environment , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
| | - Donald G Crosby
- Department of Environmental Toxicology , University of California at Davis , Davis , California 95616 , United States
| | - Kevin L Armbrust
- Department of Environmental Sciences, College of the Coast & Environment , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
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42
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Kim JK, Cho Y, Jeong MJ, Levy-Wendt B, Shin D, Yi Y, Wang DH, Zheng X, Park JH. Rapid Formation of a Disordered Layer on Monoclinic BiVO 4 : Co-Catalyst-Free Photoelectrochemical Solar Water Splitting. ChemSusChem 2018; 11:933-940. [PMID: 29274301 DOI: 10.1002/cssc.201702173] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 12/20/2017] [Indexed: 05/08/2023]
Abstract
A surface disordered layer is a plausible approach to improve the photoelectrochemical performance of TiO2 . However, the formation of a crystalline disordered layer in BiVO4 and its effectiveness towards photoelectrochemical water splitting has remained a big challenge. Here, we report a rapid solution process (within 5 s) that is able to form a disordered layer of a few nanometers thick on the surface of BiVO4 nanoparticles using a specific solution with a controllable reducing power. The disordered layer on BiVO4 alleviates charge recombination at the electrode-electrolyte interface and reduces the onset potential greatly, which in turn results in a photocurrent density of approximately 2.3 mA cm-2 at 1.23 V versus the reversible hydrogen electrode (RHE). This value is 2.1 times higher than that of bare BiVO4 . The enhanced photoactivity is attributed to the increased charge separation and transfer efficiencies, which resolve the intrinsic drawbacks of bare BiVO4 such as the short hole diffusion length of around 100 nm and poor surface oxygen evolution reactivity.
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Affiliation(s)
- Jung Kyu Kim
- School of Chemical Engineering, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, 16419, Republic of Korea
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Yoonjun Cho
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Myung Jin Jeong
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Ben Levy-Wendt
- Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Dongguen Shin
- Institute of Physics and Applied Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Yeonjin Yi
- Institute of Physics and Applied Physics, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Dong Hwan Wang
- School of Integrative Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 156-756, Republic of Korea
| | - Xiaolin Zheng
- Department of Mechanical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Jong Hyeok Park
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
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Zhong DJ, Xu YL, Hu XB, Li JX, Jia JP. Degradation of dye wastewater with a photoelectric integration process (MPEC): Microbial fuel cells-assisted dual electrodes thin-film photoelectrocatalytic. J Environ Sci Health A Tox Hazard Subst Environ Eng 2018; 53:253-259. [PMID: 29157131 DOI: 10.1080/10934529.2017.1394151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A novel photoelectric integration process (MPEC) was developed to degrade Amaranth. In the MPEC, the output voltage of the microbial fuel cells (MFCs) was used to assist the dual slant-placed electrodes thin-film photocatalytic (PC). With two MFCs connected in series, the MPEC process realized the highest decolorization efficiency. It is close to that of the external bias photoelectrocatalytic (PEC), and 7% higher than that of the self-generated electric field-assisted photoelectrocatalytic (SPEC). The feasibility of MPEC pre-treatment and MFC post-treatment of Amaranth was investigated. The results demonstrated that MPEC pre-treatment of Amaranth could improve its biodegradability. The higher MPEC decolorization efficiency indicated the stronger biodegradability of the obtained intermediates and the higher MFC output voltage. When the MPEC decolorization efficiency was gradually increased to 50%, the removal efficiencies of total Chemical Oxygen Demand (COD) by the MPEC and MFC increased; when the decolorization efficiency was increased above 50%, the removal efficiencies became stable. MPEC enhanced the biodegradability efficiently and was applicable to pre-treat textile wastewater.
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Affiliation(s)
- Deng J Zhong
- a School of Chemical Engineering, Chongqing University of Technology , Chongqing , P. R. China
| | - Yun L Xu
- a School of Chemical Engineering, Chongqing University of Technology , Chongqing , P. R. China
| | - Xue B Hu
- a School of Chemical Engineering, Chongqing University of Technology , Chongqing , P. R. China
| | - Jue X Li
- b School of Environmental Science and Engineering, Shanghai Jiao Tong University , Shanghai , P. R. China
| | - Jin P Jia
- b School of Environmental Science and Engineering, Shanghai Jiao Tong University , Shanghai , P. R. China
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Regmi C, Dhakal D, Lee SW. Visible-light-induced Ag/BiVO 4 semiconductor with enhanced photocatalytic and antibacterial performance. Nanotechnology 2018; 29:064001. [PMID: 29219840 DOI: 10.1088/1361-6528/aaa052] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
An Ag-loaded BiVO4 visible-light-driven photocatalyst was synthesized by the microwave hydrothermal method followed by photodeposition. The photocatalytic performance of the synthesized samples was evaluated on a mixed dye (methylene blue and rhodamine B), as well as bisphenol A in aqueous solution. Similarly, the disinfection activities of synthesized samples towards the Gram-negative Escherichia coli (E. coli) in a model cell were investigated under irradiation with visible light (λ ≥ 420 nm). The synthesized samples have monoclinic scheelite structure. Photocatalytic results showed that all Ag-loaded BiVO4 samples exhibited greater degradation and a higher mineralization rate than the pure BiVO4, probably due to the presence of surface plasmon absorption that arises due to the loading of Ag on the BiVO4 surface. The optimum Ag loading of 5 wt% has the highest photocatalytic performance and greatest stability with pseudo-first-order rate constants of 0.031 min-1 and 0.023 min-1 for the degradation of methylene blue and rhodamine B respectively in a mixture with an equal volume and concentration of each dye. The photocatalytic degradation of bisphenol A reaches 76.2% with 5 wt% Ag-doped BiVO4 within 180 min irradiation time. Similarly, the Ag-loaded BiVO4 could completely inactivate E. coli cells within 30 min under visible light irradiation. The disruption of the cell membrane as well as degradation of protein and DNA exhibited constituted evidence for antibacterial activity towards E. coli. Moreover, the bactericidal mechanisms involved in the photocatalytic disinfection process were systematically investigated.
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Affiliation(s)
- Chhabilal Regmi
- Department of Environmental and Biochemical Engineering, Sun Moon University, Chungnam 31460, Republic of Korea
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45
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Yassine M, Fuster L, Dévier MH, Geneste E, Pardon P, Grélard A, Dufourc E, Al Iskandarani M, Aït-Aïssa S, Garric J, Budzinski H, Mazellier P, Trivella AS. Photodegradation of novel oral anticoagulants under sunlight irradiation in aqueous matrices. Chemosphere 2018; 193:329-336. [PMID: 29149708 DOI: 10.1016/j.chemosphere.2017.11.036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Revised: 11/01/2017] [Accepted: 11/08/2017] [Indexed: 06/07/2023]
Abstract
Kinetics of photodegradation of novel oral anticoagulants dabigatran, rivaroxaban, and apixaban were studied under simulated solar light irradiation in purified, mineral, and river waters. Dabigatran and rivaroxaban underwent direct photolysis with polychromatic quantum yields of 2.2 × 10-4 and 4.4 × 10-2, respectively. The direct photodegradation of apixaban was not observed after 19 h of irradiation. Kinetics of degradation of rivaroxaban was not impacted by the nature of the aqueous matrix while photosensitization from nitrate ions was observed for dabigatran and apixaban dissolved in a mineral water. The photosensitized reactions were limited in the tested river water (Isle River, Périgueux, France) certainly due to the hydroxyl radical scavenging effect of the dissolved organic matter. The study of photoproduct structures allowed to identify two compounds for dabigatran. One of them is the 4-aminobenzamidine while the second one is a cyclization product. In the case of rivaroxaban, as studied by very high field NMR, only one photoproduct was observed i.e. a photoisomer. Finally, seven photoproducts were clearly identified from the degradation of apixaban under simulated solar light.
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Affiliation(s)
- Montaha Yassine
- Univ. Bordeaux, UMR EPOC CNRS 5805, LPTC, F-33405, Talence, France; CNRS, EPOC, UMR 5805, LPTC, F-33400, Talence, France; National Council of Scientific Research (NCSR), Lebanese Atomic Energy Commission (LAEC), Laboratory of Analysis of Organic Pollutants (LAOP), B. P. 11-8281, Riad El Solh, 1107 2260, Beirut, Lebanon
| | - Laura Fuster
- Univ. Bordeaux, UMR EPOC CNRS 5805, LPTC, F-33405, Talence, France; CNRS, EPOC, UMR 5805, LPTC, F-33400, Talence, France
| | - Marie-Hélène Dévier
- Univ. Bordeaux, UMR EPOC CNRS 5805, LPTC, F-33405, Talence, France; CNRS, EPOC, UMR 5805, LPTC, F-33400, Talence, France
| | - Emmanuel Geneste
- Univ. Bordeaux, UMR EPOC CNRS 5805, LPTC, F-33405, Talence, France; CNRS, EPOC, UMR 5805, LPTC, F-33400, Talence, France
| | - Patrick Pardon
- Univ. Bordeaux, UMR EPOC CNRS 5805, LPTC, F-33405, Talence, France; CNRS, EPOC, UMR 5805, LPTC, F-33400, Talence, France
| | - Axelle Grélard
- Institute of Chemistry and Biology of Membranes and Nano-objects, CBMN UMR 5248, CNRS University of Bordeaux, Bordeaux National Institute of Technology, Allée Geoffroy St Hilaire, Pessac, France
| | - Erick Dufourc
- Institute of Chemistry and Biology of Membranes and Nano-objects, CBMN UMR 5248, CNRS University of Bordeaux, Bordeaux National Institute of Technology, Allée Geoffroy St Hilaire, Pessac, France
| | - Mohamad Al Iskandarani
- National Council of Scientific Research (NCSR), Lebanese Atomic Energy Commission (LAEC), Laboratory of Analysis of Organic Pollutants (LAOP), B. P. 11-8281, Riad El Solh, 1107 2260, Beirut, Lebanon
| | - Selim Aït-Aïssa
- INERIS, Unité d'écotoxicologie in Vitro et in Vivo (ECOT), Verneuil-en-Halatte, France
| | - Jeanne Garric
- Irstea, UR MALY, Centre de Lyon-Villeurbanne, F-69616, Villeurbanne, France
| | - Hélène Budzinski
- Univ. Bordeaux, UMR EPOC CNRS 5805, LPTC, F-33405, Talence, France; CNRS, EPOC, UMR 5805, LPTC, F-33400, Talence, France
| | - Patrick Mazellier
- Univ. Bordeaux, UMR EPOC CNRS 5805, LPTC, F-33405, Talence, France; CNRS, EPOC, UMR 5805, LPTC, F-33400, Talence, France
| | - Aurélien S Trivella
- Univ. Bordeaux, UMR EPOC CNRS 5805, LPTC, F-33405, Talence, France; CNRS, EPOC, UMR 5805, LPTC, F-33400, Talence, France.
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Solís RR, Rivas FJ, Ferreira LC, Pirra A, Peres JA. Integrated aerobic biological-chemical treatment of winery wastewater diluted with urban wastewater. LED-based photocatalysis in the presence of monoperoxysulfate. J Environ Sci Health A Tox Hazard Subst Environ Eng 2018; 53:124-131. [PMID: 29087780 DOI: 10.1080/10934529.2017.1377584] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The oxidation of Winery Wastewater (WW) by conventional aerobic biological treatment usually leads to inefficient results due to the presence of organic substances, which are recalcitrant or toxic in conventional procedures. This study explores the combination of biological and chemical processes in order to complete the oxidation of biodegradable and non-biodegradable compounds in two sequential steps. Thus, a biological oxidation of a diluted WW is carried out by using the activated sludge process. Activated sludge was gradually acclimated to the Diluted Winery Wastewater (DWW). Some aspects concerning the biological process were evaluated (kinetics of the oxidation and sedimentation of the sludge produced). The biological treatment of the DWW led to a 40-50% of Chemical Oxygen Demand (COD) removal in 8 h, being necessary the application of an additional process. Different chemical processes combining UVA-LEDs radiation, monoperoxysulfate (MPS) and photocatalysts were applied in order to complete the COD depletion and efficient removal of polyphenols content, poorly oxidized in the previous biological step. From the options tested, the combination of UVA, MPS and a novel LaCoO3-TiO2 composite, with double route of MPS decomposition through heterogeneous catalysis and photocatalysis, led to the best results (95% of polyphenol degradation, and additional 60% of COD removal). Initial MPS concentration and pH effect in this process were assessed.
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Affiliation(s)
- Rafael R Solís
- a Departamento de Ingeniería Química y Química Física , Universidad de Extremadura , Badajoz , España
- b Instituto Universitario de Investigación del Agua, Cambio Climático y Sostenibilidad (IACYS), Universidad de Extremadura , Badajoz , España
| | - Francisco Javier Rivas
- a Departamento de Ingeniería Química y Química Física , Universidad de Extremadura , Badajoz , España
- b Instituto Universitario de Investigación del Agua, Cambio Climático y Sostenibilidad (IACYS), Universidad de Extremadura , Badajoz , España
| | - Leonor C Ferreira
- c Centro de Química de Vila Real (CQ-VR), Departamento de Química , Universidade de Trás-os-Montes e Alto Douro (UTAD) , Vila Real , Portugal
| | - Antonio Pirra
- c Centro de Química de Vila Real (CQ-VR), Departamento de Química , Universidade de Trás-os-Montes e Alto Douro (UTAD) , Vila Real , Portugal
| | - José A Peres
- c Centro de Química de Vila Real (CQ-VR), Departamento de Química , Universidade de Trás-os-Montes e Alto Douro (UTAD) , Vila Real , Portugal
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47
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Changotra R, Rajput H, Dhir A. Natural soil mediated photo Fenton-like processes in treatment of pharmaceuticals: Batch and continuous approach. Chemosphere 2017; 188:345-353. [PMID: 28888860 DOI: 10.1016/j.chemosphere.2017.09.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 08/11/2017] [Accepted: 09/04/2017] [Indexed: 06/07/2023]
Abstract
This paper manifests the potential viability of soil as a cost-free catalyst in photo-Fenton-like processes for treating pharmaceuticals at large scale. Naturally available soil without any cost intensive modification was utilized as a catalyst to degrade pharmaceuticals, specifically ornidazole (ORZ) and ofloxacin (OFX). Soil was characterized and found enriched with various iron oxides like hematite, magnetite, goethite, pyrite and wustite, which contributes toward enhanced dissolution of Fe3+ than Fe2+ in the aqueous solution resulting in augmented rate of photo-Fenton reaction. The leached iron concentration in solution was detected during the course of experiments. The degradation of ORZ and OFX was assessed in solar induced batch experiments using H2O2 as oxidant and 95% ORZ and 92% OFX removal was achieved. Elevated efficiencies were achieved due to Fe2+/Fe3+ cycling, producing more hydroxyl radical leading to the existence of homogeneous and heterogeneous reactions simultaneously. The removal efficiency of solar photo-Fenton like process was also compared to photo-Fenton process with different irradiation sources (UV-A and UV-B) and were statistically analysed. Continuous-scale studies were conducted employing soil either in the form of soil beads or as a thin layer spread on the surface of baffled reactor. Soil beads were found to have satisfactory reusability and stability. 84 and 79% degradation of ORZ and OFX was achieved using soil as thin layer while with soil beads 71 and 68% degradation, respectively. HPLC and TOC study confirmed the efficient removal of both the compounds. Toxicity assessment demonstrates the inexistence of toxic intermediates during the reaction.
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Affiliation(s)
- Rahil Changotra
- School of Energy and Environment, Thapar University, Patiala, India.
| | - Himadri Rajput
- School of Energy and Environment, Thapar University, Patiala, India.
| | - Amit Dhir
- School of Energy and Environment, Thapar University, Patiala, India.
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48
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Li A, Zhang Z, Li P, Cai L, Zhang L, Gong J. Nitrogen dioxide radicals mediated mineralization of perfluorooctanoic acid in aqueous nitrate solution with UV irradiation. Chemosphere 2017; 188:367-374. [PMID: 28888862 DOI: 10.1016/j.chemosphere.2017.08.170] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2017] [Revised: 08/30/2017] [Accepted: 08/31/2017] [Indexed: 06/07/2023]
Abstract
Effective decomposition of perfluorooctanoic acid (PFOA) has received increasing attention in recent years because of its global occurrence and resistance to most conventional treatment processes. In this study, the complete mineralization of PFOA was achieved by the UV-photolysis of nitrate aqueous solution (UV/Nitrate), where the in-situ generated nitrogen dioxide radicals (NO2) efficiently mediated the degradation of PFOA. In particular, when the twinborn hydroxyl radicals were scavenged, the production of more NO2 radicals realized the complete mineralization of PFOA. DFT calculations further confirm the feasibility of PFOA removal with NO2. Near-stoichiometric equivalents of fluoride released rather than the related intermediates were detected in solution after decomposition of PEOA, further demonstrating the complete degradation of PFOA. Possible PFOA degradation pathways were proposed on the basis of experimental results. This work offers an efficient strategy for the complete mineralization of perfluorinated chemicals, and also sheds light on the indispensable roles of nitrogen dioxide radicals for environmental pollutants removal.
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Affiliation(s)
- Aimin Li
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Applied & Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Zhe Zhang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Applied & Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Peifeng Li
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Applied & Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Lejuan Cai
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Applied & Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Lizhi Zhang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Applied & Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China.
| | - Jingming Gong
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Applied & Environmental Chemistry, College of Chemistry, Central China Normal University, Wuhan 430079, People's Republic of China.
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49
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Cooke MV, Oviedo MB, Peláez WJ, Argüello GA. UV characterization and photodegradation mechanism of the fungicide chlorothalonil in the presence and absence of oxygen. Chemosphere 2017; 187:156-162. [PMID: 28846971 DOI: 10.1016/j.chemosphere.2017.08.111] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 08/15/2017] [Accepted: 08/20/2017] [Indexed: 06/07/2023]
Abstract
An experimental and theoretical study of the UV spectrum of chlorothalonil (CT) was carried out and the vibrationally resolved HOMO→LUMO transition is presented for the first time. The fluorescence spectrum has also been recorded. Furthermore, preparative photolysis allowed a detailed study of the photoproducts formed with recognition of different isomers. In the presence of oxygen only the first reductive dechlorination-decyanation occurred, while in its absence a successive dechlorination-decyanation takes place.
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Affiliation(s)
- María Victoria Cooke
- INFIQC-CONICET-Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, X5000HUA, Argentina
| | - María Belén Oviedo
- INFIQC-CONICET-Dpto. de Química Teórica y Computacional, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, X5000HUA, Argentina
| | - Walter José Peláez
- INFIQC-CONICET-Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, X5000HUA, Argentina
| | - Gustavo Alejandro Argüello
- INFIQC-CONICET-Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, X5000HUA, Argentina.
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50
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Wang Y, Roddick FA, Fan L. Direct and indirect photolysis of seven micropollutants in secondary effluent from a wastewater lagoon. Chemosphere 2017; 185:297-308. [PMID: 28704661 DOI: 10.1016/j.chemosphere.2017.06.122] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 06/27/2017] [Accepted: 06/28/2017] [Indexed: 06/07/2023]
Abstract
The photodegradation of seven micropollutants commonly found in municipal wastewater, namely caffeine, carbamazepine, diuron, simazine, sulfamethoxazole, triclosan and 2,4-D, was investigated in pure water and secondary effluent to understand the direct and indirect photolysis of these compounds under natural sunlight irradiation. Sulfamethoxazole and triclosan were readily photodegraded with half-lives of 5.8 and 1.8 h, respectively, whilst the others were relatively resistant towards sunlight irradiation. Enhanced degradation was observed in secondary effluent compared with in the pure water matrix for all compounds, except for triclosan. It was confirmed that hydroxyl radicals played an important role in the photodegradation of the micropollutants while singlet oxygen may also play a role. The contribution of hydroxyl radical to the overall degradation of the five compounds that were resistant to direct sunlight accounted for 32%-70%. The impact of humic acid and nitrate, two known photosensitisers and wastewater components, on the photodegradation of the seven micropollutants in pure water was investigated under simulated solar radiation. The presence of nitrate promoted the photochemical loss of all seven micropollutants, however, humic acid caused promotion or inhibition, depending on the characteristics of the micropollutant. Humic acid enhanced the photolytic degradation of caffeine, sulfamethoxazole and diuron, while it hindered the photodegradation of the other four compounds by absorbing the available irradiation energy and/or reforming the parent compound. Furthermore, it was shown that there was only a small increase (up to 15%) in photodegradation of the compounds at 25 °C compared with that at 10 °C in the simulated system.
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Affiliation(s)
- Yufei Wang
- School of Engineering, RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia
| | - Felicity A Roddick
- School of Engineering, RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia.
| | - Linhua Fan
- School of Engineering, RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia
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