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Abdul Rahman NR, Muniandy L, Adam F, Iqbal A, Ng EP, Lee HL. Detailed photocatalytic study of alkaline titanates and its application for the degradation of methylene blue (MB) under solar irradiation. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.02.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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102
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Kianička J, Čík G, Šeršeň F, Špánik I, Sokolík R, Filo J. Photo-Reduction of CO₂ by VIS Light on Polythiophene-ZSM-5 Zeolite Hybrid Photo-Catalyst. Molecules 2019; 24:molecules24050992. [PMID: 30870984 PMCID: PMC6429064 DOI: 10.3390/molecules24050992] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 03/04/2019] [Accepted: 03/06/2019] [Indexed: 11/30/2022] Open
Abstract
A new hybrid photo-catalyst based on ZSM-5 zeolite suitable for reduction of carbon dioxide was synthesized. The photo-catalyst was prepared by oxidative polymerization of thiophene with FeCl3 in the presence of ZSM-5 with participation of ultrasound. The synthesized photo-catalyst strongly absorbs light radiation up to approx. 650 nm, with the absorption edge in the NIR region. Reactive radicals were generated by VIS light irradiation in an aqueous suspension consisting of the photo-catalyst with CO2. Formic acid and acetic acid were generated as the main products of the CO2 reduction. EPR spin trapping technique was applied to identify the reactive radical intermediates. In this work, the mechanism of product formation is also discussed.
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Affiliation(s)
- Jana Kianička
- Department of Environmental Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37 Bratislava, Slovakia.
| | - Gabriel Čík
- Department of Environmental Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37 Bratislava, Slovakia.
| | - František Šeršeň
- Institute of Chemistry, Faculty of Natural Science, Comenius University in Bratislava, Ilkovičova 6, SK-842 15 Bratislava, Slovakia.
| | - Ivan Špánik
- Department of Analytical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37 Bratislava, Slovakia.
| | - Robert Sokolík
- Institute of Chemistry, Faculty of Natural Science, Comenius University in Bratislava, Ilkovičova 6, SK-842 15 Bratislava, Slovakia.
| | - Juraj Filo
- Institute of Chemistry, Faculty of Natural Science, Comenius University in Bratislava, Ilkovičova 6, SK-842 15 Bratislava, Slovakia.
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103
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Chiang TH, Zhou ZX, Hsu JW. The photocatalytic performance of cesium tungsten oxide particles under visible-light irradiation and preparation using a glycothermal process. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2018.08.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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104
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Utepova IA, Trestsova MA, Kucheryavaya DA, Tsmokalyuk AN, Chupakhin ON, Charushin VN, Rempel AA. Mechanistic study of the direct oxidative photocatalytic aerobic C H/C H coupling of azines with heteroarenes. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2018.09.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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105
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Kőrösi L, Bouderias S, Csepregi K, Bognár B, Teszlák P, Scarpellini A, Castelli A, Hideg É, Jakab G. Nanostructured TiO 2-induced photocatalytic stress enhances the antioxidant capacity and phenolic content in the leaves of Vitis vinifera on a genotype-dependent manner. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2018; 190:137-145. [PMID: 30529924 DOI: 10.1016/j.jphotobiol.2018.11.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 11/18/2018] [Accepted: 11/19/2018] [Indexed: 01/22/2023]
Abstract
Over the past decades, nanotechnology has received great attention and brought revolutionary solutions for a number of challenges in scientific fields. Industrial, agricultural and medical applications of engineered nanomaterials have increased intensively. The ability of titanium dioxide nanoparticles (TiO2 NPs) to produce reactive oxygen species (ROS), when excited by ultra-violet (UV) light, makes them useful for effectively inactivate various pathogens. It is known that ROS also have signalling role in living organisms, therefore, TiO2 NPs-induced ROS can influence both enzymatic and non-enzymatic defence systems, and could play a role in the resistance of plants to pathogens. Herein, we studied the photocatalytic stress responses of grapevine (Vitis vinifera L.) as model plant, when exposed to a well-known photocatalyst, Degussa P25 TiO2 NPs. The photocatalytically produced ROS such as superoxide anion, hydroxyl radical and singlet oxygen were confirmed by electron paramagnetic resonance spectroscopy. Foliar exposure of five red cultivars (Cabernet sauvignon, Cabernet franc, Merlot, Kékfrankos and Kadarka) was carried out in blooming phenophase under field condition where plants are exposed to natural sunlight with relatively high UV radiation (with a maximum of ~ 45 W m-2). After two weeks of exposure, the effects of photogenerated ROS on the total phenolic content, antioxidant capacity, flavonol profile and the main macro-, microelements of the leaves were studied in detail. We found that foliar application of TiO2 NPs boosted the total phenolic content and biosynthesis of the leaf flavonols depending on the grapevine variety. Photocatalytically active TiO2 NPs also increased K, Mg, Ca, B and Mn levels in the leaves as shown by ICP-AES measurements.
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Affiliation(s)
- László Kőrösi
- Research Institute for Viticulture and Oenology, University of Pécs, Pázmány P. u. 4, Pécs H-7634, Hungary.
| | - Sakina Bouderias
- Research Institute for Viticulture and Oenology, University of Pécs, Pázmány P. u. 4, Pécs H-7634, Hungary; Department of Plant Biology, University of Pécs, Ifjúság u. 6, Pécs H-7624, Hungary
| | - Kristóf Csepregi
- Department of Plant Biology, University of Pécs, Ifjúság u. 6, Pécs H-7624, Hungary
| | - Balázs Bognár
- Institute of Organic and Medicinal Chemistry, University of Pécs, Szigeti st. 12, H-7624 Pécs, Hungary
| | - Péter Teszlák
- Research Institute for Viticulture and Oenology, University of Pécs, Pázmány P. u. 4, Pécs H-7634, Hungary
| | - Alice Scarpellini
- Electron Microscopy Facility, Istituto Italiano di Tecnologia, via Morego 30, Genova 16163, Italy
| | - Andrea Castelli
- Department of Nanochemistry, Istituto Italiano di Tecnologia, via Morego 30, Genova 16163, Italy
| | - Éva Hideg
- Department of Plant Biology, University of Pécs, Ifjúság u. 6, Pécs H-7624, Hungary
| | - Gábor Jakab
- Research Institute for Viticulture and Oenology, University of Pécs, Pázmány P. u. 4, Pécs H-7634, Hungary; Department of Plant Biology, University of Pécs, Ifjúság u. 6, Pécs H-7624, Hungary
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106
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107
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Lee H, Jung TS, Park JW, Kim HJ. Boosting Modulation of Oxide Semiconductors via Voltage-Based Ambi-Ionic Migration. ACS APPLIED MATERIALS & INTERFACES 2018; 10:37216-37222. [PMID: 30298732 DOI: 10.1021/acsami.8b11854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In recent years, high-performance amorphous oxide semiconductor thin-film transistor (AOS TFT) technology is required to meet the increasing demand for novel displays, such as rollable, transparent, or augmented reality head-up displays. It has been demonstrated that voltage-based modulation techniques for AOS-based active layers can achieve high-performance AOS TFTs. The voltage-based modulation technique allows specific ions to migrate into the active layer depending on the polarity of the applied voltage, thus easily modulating the active layer. Additionally, potassium superoxide (KO2) solution is employed in AOS TFTs as a source of potassium (K+) and highly reactive superoxide radical (O2•-) ions. The K+ and O2•- ions in the KO2 solution are controlled by an applied voltage bias and rapidly migrate into the active layer, directly changing its chemical composition and electrical properties. AOS TFTs that use this technique exhibit better electrical performance than conventional AOS TFTs: the field-effect mobility improved from 10.05 to 15.31 cm2/V·s; the subthreshold swing decreased from 0.44 to 0.33 V/dec; the Ion/off ratio increased from 1.24 × 107 to 3.17 × 108; and the threshold voltage shift decreased from 5.2 to 3.4 V under a positive bias stress test conducted over 10 000 s. Ultimately, this approach to modulating the internal ion distribution in oxide semiconductors could provide opportunities for various AOS devices to attain desirable electrical characteristics.
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Affiliation(s)
- Heesoo Lee
- School of Electrical and Electronic Engineering , Yonsei University , 50 Yonsei-ro , Seodaemun-gu, Seoul 03722 , Republic of Korea
| | - Tae Soo Jung
- School of Electrical and Electronic Engineering , Yonsei University , 50 Yonsei-ro , Seodaemun-gu, Seoul 03722 , Republic of Korea
| | - Jeong Woo Park
- School of Electrical and Electronic Engineering , Yonsei University , 50 Yonsei-ro , Seodaemun-gu, Seoul 03722 , Republic of Korea
| | - Hyun Jae Kim
- School of Electrical and Electronic Engineering , Yonsei University , 50 Yonsei-ro , Seodaemun-gu, Seoul 03722 , Republic of Korea
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108
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Keum Y, Park S, Chen YP, Park J. Titanium-Carboxylate Metal-Organic Framework Based on an Unprecedented Ti-Oxo Chain Cluster. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201809762] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yesub Keum
- Department of Emerging Materials Science; Daegu-Gyeongbuk Institute of Science & Technology (DGIST); Daegu 42988 Republic of Korea
| | - Seonghun Park
- Department of Emerging Materials Science; Daegu-Gyeongbuk Institute of Science & Technology (DGIST); Daegu 42988 Republic of Korea
| | - Ying-Pin Chen
- Department of Protein Purification; BioNova Scientific Inc.; Fremont CA 94539 USA
| | - Jinhee Park
- Department of Emerging Materials Science; Daegu-Gyeongbuk Institute of Science & Technology (DGIST); Daegu 42988 Republic of Korea
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109
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Keum Y, Park S, Chen YP, Park J. Titanium-Carboxylate Metal-Organic Framework Based on an Unprecedented Ti-Oxo Chain Cluster. Angew Chem Int Ed Engl 2018; 57:14852-14856. [PMID: 30203511 DOI: 10.1002/anie.201809762] [Citation(s) in RCA: 71] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Indexed: 11/10/2022]
Abstract
Titanium(IV)-based metal-organic frameworks (Ti-MOFs) have received significant attention in recent years due to their numerous photocatalytic applications. We herein prepare the single-crystalline Ti-carboxylate MOF (DGIST-1) composed of an unprecedented Ti-oxo chain cluster and the porphyrinic ligand, TCPP (tetrakis(4-carboxyphenyl)porphyrin). Preformed Ti-oxo clusters were used as Ti4+ sources to avoid the spontaneous hydrolysis and condensation reactions of traditional Ti-alkoxide precursors, thus, enabling the formation of the highly crystalline Ti-MOF. The successfully activated DGIST-1 exhibited a higher surface area (i.e., 1957.3 m2 g-1 ) than previously reported Ti-MOFs due to its high crystallinity. Furthermore, the visible-light-responsive photocatalytic activity of DGIST-1 was confirmed by the simultaneous generation of singlet oxygen (1 O2 ) and superoxide (. O2 - ) species, in addition to the highly efficient and selective oxidation of benzyl alcohol to benzaldehyde.
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Affiliation(s)
- Yesub Keum
- Department of Emerging Materials Science, Daegu-Gyeongbuk Institute of Science & Technology (DGIST), Daegu, 42988, Republic of Korea
| | - Seonghun Park
- Department of Emerging Materials Science, Daegu-Gyeongbuk Institute of Science & Technology (DGIST), Daegu, 42988, Republic of Korea
| | - Ying-Pin Chen
- Department of Protein Purification, BioNova Scientific Inc., Fremont, CA, 94539, USA
| | - Jinhee Park
- Department of Emerging Materials Science, Daegu-Gyeongbuk Institute of Science & Technology (DGIST), Daegu, 42988, Republic of Korea
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110
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Barbieriková Z, Dvoranová D, Brezová V. Photoinduced transformation of glycerol in titania suspensions. (An EPR spin trapping study of radical intermediates). Catal Today 2018. [DOI: 10.1016/j.cattod.2017.12.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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111
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Sun X, Chang Y, Cheng Y, Feng Y, Zhang H. Band Alignment-Driven Oxidative Injury to the Skin by Anatase/Rutile Mixed-Phase Titanium Dioxide Nanoparticles Under Sunlight Exposure. Toxicol Sci 2018; 164:300-312. [DOI: 10.1093/toxsci/kfy088] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Affiliation(s)
- Xiujuan Sun
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
| | - Yun Chang
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Yan Cheng
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
| | - Yanlin Feng
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
| | - Haiyuan Zhang
- Laboratory of Chemical Biology, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
- University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
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112
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Hricovíni M, Mazúr M, Sîrbu A, Palamarciuc O, Arion VB, Brezová V. Copper(II) Thiosemicarbazone Complexes and Their Proligands upon UVA Irradiation: An EPR and Spectrophotometric Steady-State Study. Molecules 2018; 23:molecules23040721. [PMID: 29561827 PMCID: PMC6017935 DOI: 10.3390/molecules23040721] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 03/15/2018] [Accepted: 03/19/2018] [Indexed: 12/31/2022] Open
Abstract
X- and Q-band electron paramagnetic resonance (EPR) spectroscopy was used to characterize polycrystalline Cu(II) complexes that contained sodium 5-sulfonate salicylaldehyde thiosemicarbazones possessing a hydrogen, methyl, ethyl, or phenyl substituent at the terminal nitrogen. The ability of thiosemicarbazone proligands to generate superoxide radical anions and hydroxyl radicals upon their exposure to UVA irradiation in aerated aqueous solutions was evidenced by the EPR spin trapping technique. The UVA irradiation of proligands in neutral or alkaline solutions and dimethylsulfoxide (DMSO) caused a significant decrease in the absorption bands of aldimine and phenolic chromophores. Mixing of proligand solutions with the equimolar amount of copper(II) ions resulted in the formation of 1:1 Cu(II)-to-ligand complex, with the EPR and UV-Vis spectra fully compatible with those obtained for the dissolved Cu(II) thiosemicarbazone complexes. The formation of the complexes fully inhibited the photoinduced generation of reactive oxygen species, and only subtle changes were found in the electronic absorption spectra of the complexes in aqueous and DMSO solutions upon UVA steady-state irradiation. The dark redox activity of copper(II) complexes and proligand/Cu(II) aqueous solutions towards hydrogen peroxide which resulted in the generation of hydroxyl radicals, was confirmed by spin trapping experiments.
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Affiliation(s)
- Michal Hricovíni
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37 Bratislava, Slovakia.
| | - Milan Mazúr
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37 Bratislava, Slovakia.
| | - Angela Sîrbu
- Department of Chemistry, Moldova State University, A. Mateevici Street 60, MD-2009 Chisinau, Moldova.
| | - Oleg Palamarciuc
- Department of Chemistry, Moldova State University, A. Mateevici Street 60, MD-2009 Chisinau, Moldova.
| | - Vladimir B Arion
- Institute of Inorganic Chemistry, University of Vienna, Währinger Strasse 42, A-1090 Vienna, Austria.
| | - Vlasta Brezová
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Radlinského 9, SK-812 37 Bratislava, Slovakia.
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113
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Twardoch M, Messai Y, Vileno B, Hoarau Y, Mekki DE, Felix O, Turek P, Weiss J, Decher G, Martel D. Development of an electron paramagnetic resonance methodology for studying the photo-generation of reactive species in semiconductor nano-particle assembled films. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1433882] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Marek Twardoch
- Institut Charles Sadron, Université de Strasbourg, CNRS, Strasbourg, France
| | - Youcef Messai
- Institut de Chimie, UMR 7177, Université de Strasbourg, CNRS, Strasbourg, France
- Laboratoire d'Etude Des Surfaces et Interfaces de La Matière Solide (LESIMS), Université Badji Mokhtar, Annaba, Algeria
| | - Bertrand Vileno
- Institut de Chimie, UMR 7177, Université de Strasbourg, CNRS, Strasbourg, France
- French EPR Federation of Research (REseau NAtional de RPE interDisciplinaire (RENARD), Fédération IR-RPE CNRS #3443), Lille, France
| | - Yannick Hoarau
- Laboratoire des Sciences de l'Ingénieur, de l'Informatique et de l'Imagerie, UMR 7357, Université de Strasbourg, CNRS, Strasbourg, France
| | - Djamel E. Mekki
- Laboratoire d'Etude Des Surfaces et Interfaces de La Matière Solide (LESIMS), Université Badji Mokhtar, Annaba, Algeria
| | - Olivier Felix
- Institut Charles Sadron, Université de Strasbourg, CNRS, Strasbourg, France
| | - Philippe Turek
- Institut de Chimie, UMR 7177, Université de Strasbourg, CNRS, Strasbourg, France
- French EPR Federation of Research (REseau NAtional de RPE interDisciplinaire (RENARD), Fédération IR-RPE CNRS #3443), Lille, France
| | - Jean Weiss
- Institut de Chimie, UMR 7177, Université de Strasbourg, CNRS, Strasbourg, France
| | - Gero Decher
- Institut Charles Sadron, Université de Strasbourg, CNRS, Strasbourg, France
- International Center for Frontier Research in Chemistry, Strasbourg, France
| | - David Martel
- Institut Charles Sadron, Université de Strasbourg, CNRS, Strasbourg, France
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115
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116
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Synthesis, characterization and photocatalytic activity of TiO 2 /ZnO-supported phosphomolybdic acid nanocomposites. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2017.11.031] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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117
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Konstantinova E, Minnekhanov A, Beltiukov A, Ivanov V, Sutherland AJ, Boytsova O. Unveiling point defects in titania mesocrystals: a combined EPR and XPS study. NEW J CHEM 2018. [DOI: 10.1039/c8nj03196g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Titania mesocrystals, prepared using a polyethylene template, were studied by a combination of electron microscopy, XPS and EPR techniques.
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Affiliation(s)
- Elizaveta Konstantinova
- Department of Physics
- Lomonosov Moscow State University
- Moscow 119991
- Russia
- National Research Center Kurchatov Institute
| | | | - Artemii Beltiukov
- Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences
- Izhevsk 426000
- Russia
| | - Vladimir Ivanov
- Kurnakov Institute of General and Inorganic Chemistry Russian Academy of Sciences
- Moscow 119991
- Russia
- Department of Materials Science
- Lomonosov Moscow State University
| | | | - Olga Boytsova
- Kurnakov Institute of General and Inorganic Chemistry Russian Academy of Sciences
- Moscow 119991
- Russia
- Department of Materials Science
- Lomonosov Moscow State University
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118
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Tabatabaei N, Dashtian K, Ghaedi M, Sabzehmeidani MM, Ameri E. Novel visible light-driven Cu-based MOFs/Ag2O composite photocatalysts with enhanced photocatalytic activity toward the degradation of orange G: their photocatalytic mechanism and optimization study. NEW J CHEM 2018. [DOI: 10.1039/c7nj03245e] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present work is devoted to the synthesis of two visible light-driven Cu-based metal organic frameworks composited with Ag2O nanoparticles.
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Affiliation(s)
- Nima Tabatabaei
- Department of Chemical Engineering
- Shahreza Branch
- Islamic Azad University
- Isfahan
- Iran
| | | | | | | | - Elham Ameri
- Department of Chemical Engineering
- Shahreza Branch
- Islamic Azad University
- Isfahan
- Iran
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119
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Günay T, Çimen Y. Degradation of 2,4,6-trichlorophenol with peroxymonosulfate catalyzed by soluble and supported iron porphyrins. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 231:1013-1020. [PMID: 28898954 DOI: 10.1016/j.envpol.2017.08.059] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 08/09/2017] [Accepted: 08/11/2017] [Indexed: 06/07/2023]
Abstract
Degradation of 2,4,6-trichloropenol (TCP) with peroxymonosulfate (PMS) catalyzed by iron porphyrin tetrasulfonate ([FePTS)] was investigated in an 8-to-1 (v/v) CH3OH-H2O mixture. Typical reaction medium contained a 4.00 mL methanol solution of TCP (0.100 mmol), a 0.50 mL aqueous solution of catalyst (5.0 × 10-4 mmol), and 0.100 mmol PMS (as 0.031 g of Oxone). The reaction was performed at ambient temperature. The conversion of TCP was 74% in 30 min and 80% in 6 h when the catalyst was [FePTS]. Amberlite IRA-900 supported [FePTS] catalyst was also prepared. In the recycling experiments the homogeneous [FePTS] lost its activity after the first cycle, while [FePTS]-Amberlite IRA 900 maintained its activity for the first 2 cycles. After the second cycle, the conversion of TCP dropped to <10% for Amberlite IRA-900 supported [FePTS] catalyst. The degradation of TCP with PMS was also attempted using cobalt, copper, nickel and palladium porphyrin tetrasulfonate catalysts, however, no catalytic activity was observed with these structures.
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Affiliation(s)
- Tuğçe Günay
- Department of Chemistry, Faculty of Science, Anadolu University, 26470 Eskişehir, Turkey
| | - Yasemin Çimen
- Department of Chemistry, Faculty of Science, Anadolu University, 26470 Eskişehir, Turkey.
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120
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Zielińska-Jurek A, Klein M, Hupka J. Enhanced visible light photocatalytic activity of Pt/I-TiO2 in a slurry system and supported on glass packing. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2017.08.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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121
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Selective aerobic oxidation reactions using a combination of photocatalytic water oxidation and enzymatic oxyfunctionalisations. Nat Catal 2017; 1:55-62. [PMID: 29430568 PMCID: PMC5798593 DOI: 10.1038/s41929-017-0001-5] [Citation(s) in RCA: 172] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Peroxygenases offer attractive means to address challenges in selective oxyfunctionalisation chemistry. Despite their attractiveness, the application of peroxygenases in synthetic chemistry remains challenging due to their facile inactivation by the stoichiometric oxidant (H2O2). Often atom inefficient peroxide generation systems are required, which show little potential for large scale implementation. Here we show that visible light-driven, catalytic water oxidation can be used for in situ generation of H2O2 from water, rendering the peroxygenase catalytically active. In this way the stereoselective oxyfunctionalisation of hydrocarbons can be achieved by simply using the catalytic system, water and visible light.
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122
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Zhang W, Burek BO, Fernández-Fueyo E, Alcalde M, Bloh JZ, Hollmann F. Selektive C-H-Bindungsaktivierung durch eine Kaskade aus Photochemie und Biokatalyse. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201708668] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wuyuan Zhang
- Department of Biotechnology; Delft University of Technology; Van der Maasweg 9 2629HZ Delft Niederlande
| | - Bastien O. Burek
- DECHEMA-Forschungsinstitut; Theodor-Heuss-Allee 25 60486 Frankfurt am Main Deutschland
| | | | - Miguel Alcalde
- Department of Biocatalysis; Institute of Catalysis; CSIC; 28049 Madrid Spanien
| | - Jonathan Z. Bloh
- DECHEMA-Forschungsinstitut; Theodor-Heuss-Allee 25 60486 Frankfurt am Main Deutschland
| | - Frank Hollmann
- Department of Biotechnology; Delft University of Technology; Van der Maasweg 9 2629HZ Delft Niederlande
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Zhang W, Burek BO, Fernández-Fueyo E, Alcalde M, Bloh JZ, Hollmann F. Selective Activation of C-H Bonds in a Cascade Process Combining Photochemistry and Biocatalysis. Angew Chem Int Ed Engl 2017; 56:15451-15455. [PMID: 28994504 PMCID: PMC5725739 DOI: 10.1002/anie.201708668] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Revised: 10/08/2017] [Indexed: 11/08/2022]
Abstract
Selective oxyfunctionalizations of inert C-H bonds can be achieved under mild conditions by using peroxygenases. This approach, however, suffers from the poor robustness of these enzymes in the presence of hydrogen peroxide as the stoichiometric oxidant. Herein, we demonstrate that inorganic photocatalysts such as gold-titanium dioxide efficiently provide H2 O2 through the methanol-driven reductive activation of ambient oxygen in amounts that ensure that the enzyme remains highly active and stable. Using this approach, the stereoselective hydroxylation of ethylbenzene to (R)-1-phenylethanol was achieved with high enantioselectivity (>98 % ee) and excellent turnover numbers for the biocatalyst (>71 000).
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Affiliation(s)
- Wuyuan Zhang
- Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629HZ, Delft, The Netherlands
| | - Bastien O Burek
- DECHEMA-Forschungsinstitut, Theodor-Heuss-Allee 25, 60486, Frankfurt am Main, Germany
| | | | - Miguel Alcalde
- Department of Biocatalysis, Institute of Catalysis, CSIC, 28049, Madrid, Spain
| | - Jonathan Z Bloh
- DECHEMA-Forschungsinstitut, Theodor-Heuss-Allee 25, 60486, Frankfurt am Main, Germany
| | - Frank Hollmann
- Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629HZ, Delft, The Netherlands
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124
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Misak A, Grman M, Bacova Z, Rezuchova I, Hudecova S, Ondriasova E, Krizanova O, Brezova V, Chovanec M, Ondrias K. Polysulfides and products of H 2S/S-nitrosoglutathione in comparison to H 2S, glutathione and antioxidant Trolox are potent scavengers of superoxide anion radical and produce hydroxyl radical by decomposition of H 2O 2. Nitric Oxide 2017; 76:136-151. [PMID: 28951200 DOI: 10.1016/j.niox.2017.09.006] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 09/20/2017] [Accepted: 09/20/2017] [Indexed: 01/20/2023]
Abstract
Exogenous and endogenously produced sulfide derivatives, such as H2S/HS-/S2-, polysulfides and products of the H2S/S-nitrosoglutathione interaction (S/GSNO), affect numerous biological processes in which superoxide anion (O2-) and hydroxyl (OH) radicals play an important role. Their cytoprotective-antioxidant and contrasting pro-oxidant-toxic effects have been reported. Therefore, the aim of our work was to contribute to resolving this apparent inconsistency by studying sulfide derivatives/free radical interactions and their consequent biological effects compared to the antioxidants glutathione (GSH) and Trolox. Using the electron paramagnetic resonance (EPR) spin trapping technique and O2-, we found that a polysulfide (Na2S4) and S/GSNO were potent scavengers of O2- and cPTIO radicals compared to H2S (Na2S), GSH and Trolox, and S/GSNO scavenged the DEPMPO-OH radical. As detected by the EPR spectra of DEPMPO-OH, the formation of OH in physiological solution by S/GSNO was suggested. All the studied sulfide derivatives, but not Trolox or GSH, had a bell-shaped potency to decompose H2O2 and produced OH in the following order: S/GSNO > Na2S4 ≥ Na2S > GSH = Trolox = 0, but they scavenged OH at higher concentrations. In studies of the biological consequences of these sulfide derivatives/H2O2 properties, we found the following: (i) S/GSNO alone and all sulfide derivatives in the presence of H2O2 cleaved plasmid DNA; (ii) S/GSNO interfered with viral replication and consequently decreased the infectivity of viruses; (iii) the sulfide derivatives induced apoptosis in A2780 cells but inhibited apoptosis induced by H2O2; and (iv) Na2S4 modulated intracellular calcium in A87MG cells, which depended on the order of Na2S4/H2O2 application. We suggest that the apparent inconsistency of the cytoprotective-antioxidant and contrasting pro-oxidant-toxic biological effects of sulfide derivatives results from their time- and concentration-dependent radical production/scavenging properties and their interactions with O2-, OH and H2O2. The results imply a direct involvement of sulfide derivatives in O2- and H2O2/OH free radical pathways modulating antioxidant/toxic biological processes.
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Affiliation(s)
- Anton Misak
- Institute of Clinical and Translational Research, Biomedical Research Center, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Marian Grman
- Institute of Clinical and Translational Research, Biomedical Research Center, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Zuzana Bacova
- Institute of Experimental Endocrinology, Biomedical Research Center, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Ingeborg Rezuchova
- Institute of Virology, Biomedical Research Center, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Sona Hudecova
- Institute of Clinical and Translational Research, Biomedical Research Center, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Elena Ondriasova
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovak Republic
| | - Olga Krizanova
- Institute of Clinical and Translational Research, Biomedical Research Center, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Vlasta Brezova
- Faculty of Chemical and Food Technology, Slovak University of Technology, Bratislava, Slovak Republic
| | - Miroslav Chovanec
- Cancer Research Institute, Biomedical Research Center, Slovak Academy of Sciences, Bratislava, Slovak Republic
| | - Karol Ondrias
- Institute of Clinical and Translational Research, Biomedical Research Center, Slovak Academy of Sciences, Bratislava, Slovak Republic.
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125
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Nosaka Y, Nosaka AY. Generation and Detection of Reactive Oxygen Species in Photocatalysis. Chem Rev 2017; 117:11302-11336. [DOI: 10.1021/acs.chemrev.7b00161] [Citation(s) in RCA: 1754] [Impact Index Per Article: 250.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Yoshio Nosaka
- Department of Materials Science
and Technology, Nagaoka University of Technology Nagaoka 940-2188, Japan
| | - Atsuko Y. Nosaka
- Department of Materials Science
and Technology, Nagaoka University of Technology Nagaoka 940-2188, Japan
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126
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Vernez D, Sauvain JJ, Laulagnet A, Otaño AP, Hopf NB, Batsungnoen K, Suárez G. Airborne nano-TiO 2 particles: An innate or environmentally-induced toxicity? J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.04.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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127
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Vodišek N, Ramanujachary K, Brezová V, Lavrenčič Štangar U. Transparent titania-zirconia-silica thin films for self-cleaning and photocatalytic applications. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.12.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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128
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Tseng IH, Sung YM, Chang PY, Lin SW. Photocatalytic Performance of Titania Nanosheets Templated by Graphene Oxide. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.01.036] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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129
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Mörke C, Rebl H, Finke B, Dubs M, Nestler P, Airoudj A, Roucoules V, Schnabelrauch M, Körtge A, Anselme K, Helm CA, Nebe JB. Abrogated Cell Contact Guidance on Amino-Functionalized Microgrooves. ACS APPLIED MATERIALS & INTERFACES 2017; 9:10461-10471. [PMID: 28296389 DOI: 10.1021/acsami.6b16430] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Topographical and chemical features of biomaterial surfaces affect the cell physiology at the interface and are promising tools for the improvement of implants. The dominance of the surface topography on cell behavior is often accentuated. Striated surfaces induce an alignment of cells and their intracellular adhesion-mediated components. Recently, it could be demonstrated that a chemical modification via plasma polymerized allylamine was not only able to boost osteoblast cell adhesion and spreading but also override the cell alignment on stochastically machined titanium. In order to discern what kind of chemical surface modifications let the cell forget the underlying surface structure, we used an approach on geometric microgrooves produced by deep reactive ion etching (DRIE). In this study, we systematically investigated the surface modification by (i) methyl-, carboxyl-, and amino functionalization created via plasma polymerization processes, (ii) coating with the extracellular matrix protein collagen-I or immobilization of the integrin adhesion peptide sequence Arg-Gly-Asp (RGD), and (iii) treatment with an atmospheric pressure plasma jet operating with argon/oxygen gas (Ar/O2). Interestingly, only the amino functionalization, which presented positive charges at the surface, was able to chemically disguise the microgrooves and therefore to interrupt the microtopography induced contact guidance of the osteoblastic cells MG-63. However, the RGD peptide coating revealed enhanced cell spreading as well, with fine, actin-containing protrusions. The Ar/O2-functionalization demonstrated the best topography handling, e.g. cells closely attached even to features such as the sidewalls of the groove steps. In the end, the amino functionalization is unique in abrogating the cell contact guidance.
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Affiliation(s)
- Caroline Mörke
- Department of Cell Biology, University Medical Center Rostock , Schillingallee 69, 18057 Rostock, Germany
| | - Henrike Rebl
- Department of Cell Biology, University Medical Center Rostock , Schillingallee 69, 18057 Rostock, Germany
| | - Birgit Finke
- Leibniz-Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Strasse 2, 17489 Greifswald, Germany
| | - Manuela Dubs
- Biomaterials Department, INNOVENT e. V. , Pruessingstrasse 27B, 07745 Jena, Germany
| | - Peter Nestler
- Institute of Physics, University of Greifswald, Felix-Hausdorff-Strasse 6, 17487 Greifswald, Germany
| | - Aissam Airoudj
- Institute of Materials Sciences of Mulhouse (IS2M), CNRS UMR7361, 15 rue jean starcky, BP2488, 68057 Mulhouse cedex, France
| | - Vincent Roucoules
- Institute of Materials Sciences of Mulhouse (IS2M), CNRS UMR7361, 15 rue jean starcky, BP2488, 68057 Mulhouse cedex, France
| | | | - Andreas Körtge
- Institute of Electronic Appliances and Circuits, University of Rostock , Albert-Einstein-Strasse 2, 18059 Rostock, Germany
| | - Karine Anselme
- Institute of Materials Sciences of Mulhouse (IS2M), CNRS UMR7361, 15 rue jean starcky, BP2488, 68057 Mulhouse cedex, France
| | - Christiane A Helm
- Institute of Physics, University of Greifswald, Felix-Hausdorff-Strasse 6, 17487 Greifswald, Germany
| | - J Barbara Nebe
- Department of Cell Biology, University Medical Center Rostock , Schillingallee 69, 18057 Rostock, Germany
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130
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Kryczyk A, Żmudzki P, Hubicka U. Determination of bifonazole and identification of its photocatalytic degradation products using UPLC-MS/MS. Biomed Chromatogr 2017; 31. [PMID: 28186351 DOI: 10.1002/bmc.3955] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 02/02/2017] [Accepted: 02/08/2017] [Indexed: 01/28/2023]
Abstract
The main goal of the presented work was to investigate the effect of ZnO or/and TiO2 on the stability of bifonazole in solutions under UVA irradiation. To this end, a simple and reproducible UPLC method for the determination of bifonazole in the presence of its photocatalytic degradation products was developed. Linearity was studied in the range of 0.0046-0.15 mg mL-1 with a determination coefficient of 0.9996. Bifonazole underwent a photocatalytic degradation process under the experimental conditions used. Comparative studies showed that combination of TiO2 /ZnO (1:1 w/w) was a more effective catalyst than TiO2 or ZnO with a degradation rate of up to 67.57% after 24 h of irradiation. Further, kinetic analyses indicated that the photocatalytic degradation of bifonazole in the mixture of TiO2 /ZnO can be described by a pseudo-first order reaction. Statistical comparison clearly indicated that the presence of TiO2 /ZnO also affected the stability of bifonazole from a cream preparation after 15 h of UVA exposure (p < 0.05). Ten photodegradation products of bifonazole were identified for the first time and their plausible fragmentation pathways, derived from MS/MS data, were proposed. The main pathway in the photocatalytic transformation of bifonazole in the presence of ZnO or/and TiO2 involves hydroxylation of the methanetriyl group and/or adjacent phenyl rings and cleavage of the imidazole moiety.
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Affiliation(s)
- Agata Kryczyk
- Department of Inorganic and Analytical Chemistry, Jagiellonian University Medical College, Kraków, Poland
| | - Paweł Żmudzki
- Department of Medicinal Chemistry, Jagiellonian University Medical College, Kraków, Poland
| | - Urszula Hubicka
- Department of Inorganic and Analytical Chemistry, Jagiellonian University Medical College, Kraków, Poland
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131
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Zhang H, Zhang W, Zhao M, Yang P, Zhu Z. A site-holding effect of TiO2 surface hydroxyl in the photocatalytic direct synthesis of 1,1-diethoxyethane from ethanol. Chem Commun (Camb) 2017; 53:1518-1521. [DOI: 10.1039/c6cc09050h] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two different effects of TiO2 surface hydroxyl: an indirect site-holding effect on the C–O coupling process of neat ethanol and direct part of the reaction in the C–C coupling process of ethanol–H2O.
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Affiliation(s)
- Hongxia Zhang
- Institute of Application Chemistry
- Shanxi University
- Taiyuan 030006
- China
- State Key Laboratory of Coal Conversion
| | - Wenqin Zhang
- Institute of Application Chemistry
- Shanxi University
- Taiyuan 030006
- China
- State Key Laboratory of Coal Conversion
| | - Min Zhao
- Institute of Application Chemistry
- Shanxi University
- Taiyuan 030006
- China
- State Key Laboratory of Coal Conversion
| | - Pengju Yang
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
| | - Zhenping Zhu
- State Key Laboratory of Coal Conversion
- Institute of Coal Chemistry
- Chinese Academy of Sciences
- Taiyuan 030001
- China
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132
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Hricovíni M, Dvoranová D, Barbieriková Z, Jantová S, Bella M, Šoral M, Brezová V. 6-Nitroquinolones in dimethylsulfoxide: Spectroscopic characterization and photoactivation of molecular oxygen. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2016.08.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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133
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Ekanger LA, Basal LA, Allen MJ. The Role of Coordination Environment and pH in Tuning the Oxidation Rate of Europium(II). Chemistry 2016; 23:1145-1150. [PMID: 27897355 DOI: 10.1002/chem.201604842] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Indexed: 01/14/2023]
Abstract
The EuII/III redox couple offers metal-based oxidation-sensing with magnetic resonance imaging making the study of EuII oxidation chemistry important in the design of new probes. Accordingly, we explored oxidation reactions with a set of EuII -containing complexes. Superoxide formation from the reaction between EuII and dioxygen was observed using electron paramagnetic resonance spectroscopy. Additionally, oxidation kinetics of three EuII -containing complexes with bromate and glutathione disulfide at pH values, including 5 and 7, is reported. In the reaction with bromate, the oxidation rate of two of the complexes increased by 7.3 and 6.7 times upon decreasing pH from 7 to 5, but the rate increased by 17 times for a complex containing amide functional groups over the same pH range. The oxidation rate of a fluorobenzo-functionalized cryptate was relatively slow, indicating that the ligand used to impart thermodynamic oxidative stability might also be useful for controlling oxidation kinetics.
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Affiliation(s)
- Levi A Ekanger
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI, 48202, USA
| | - Lina A Basal
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI, 48202, USA
| | - Matthew J Allen
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, MI, 48202, USA
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134
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Pathways of the photocatalytic reaction of acetate in H2O and D2O: A combined EPR and ATR-FTIR study. J Catal 2016. [DOI: 10.1016/j.jcat.2016.08.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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135
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Enachi M, Guix M, Postolache V, Ciobanu V, Fomin VM, Schmidt OG, Tiginyanu I. Light-Induced Motion of Microengines Based on Microarrays of TiO 2 Nanotubes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:5497-5505. [PMID: 27593218 DOI: 10.1002/smll.201601680] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 07/10/2016] [Indexed: 06/06/2023]
Abstract
An electrochemical approach for manufacturing light-driven nanostructured titanium dioxide (TiO2 ) microengines with controlled spatial architecture for improved performance is reported. The microengines based on microscale arrays of TiO2 nanotubes with variable (50-120 nm) inner diameter show a quasi-ordered arrangement of nanotubes, being the smallest tubular entities for catalytic microengines reported to date. The nanotubes exhibit well defined crystalline phases depending upon the postfabrication annealing conditions that determine the microengines' efficiency. When exposed to UV-light, the microarrays of TiO2 nanotubes exhibiting conical internal shapes show directed motion in confined space, both in the presence and absence of hydrogen peroxide. In the former case, two different motion patterns related to diffusiophoresis and localized nanobubble generation inside of the tubes due to the photocatalytic decomposition of H2 O2 are disclosed. Controlled pick-up, transport, and release of individual and agglomerated particles are demonstrated using the UV light irradiation of microengines. The obtained results show that light-driven microengines based on microarrays of TiO2 nanotubes represent a promising platform for controlled micro/nanoscale sample transportation in fluids as well as for environmental applications, in particular, for the enhanced photocatalytic degradation of organic pollutants due to the improved intermixing taking place during the motion of TiO2 microengines.
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Affiliation(s)
- Mihail Enachi
- National Center for Materials Study and Testing, Technical University of Moldova, 168 Stefan cel Mare av., MD-2004, Chisinau, Republic of Moldova
| | - Maria Guix
- IFW Dresden, Institute for Integrative Nanosciences (IIN), 20 Helmholtzstraße, D-01069, Dresden, Germany.
| | - Vitalie Postolache
- National Center for Materials Study and Testing, Technical University of Moldova, 168 Stefan cel Mare av., MD-2004, Chisinau, Republic of Moldova
| | - Vladimir Ciobanu
- National Center for Materials Study and Testing, Technical University of Moldova, 168 Stefan cel Mare av., MD-2004, Chisinau, Republic of Moldova
| | - Vladimir M Fomin
- IFW Dresden, Institute for Integrative Nanosciences (IIN), 20 Helmholtzstraße, D-01069, Dresden, Germany
| | - Oliver G Schmidt
- IFW Dresden, Institute for Integrative Nanosciences (IIN), 20 Helmholtzstraße, D-01069, Dresden, Germany
| | - Ion Tiginyanu
- Institute of Electronic Engineering and Nanotechnologies, Academy of Sciences of Moldova (ASM), 5 Academiei str., MD-2028, Chisinau, Republic of Moldova
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136
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Broad-Spectrum Antimicrobial Effects of Photocatalysis Using Titanium Dioxide Nanoparticles Are Strongly Potentiated by Addition of Potassium Iodide. Antimicrob Agents Chemother 2016; 60:5445-53. [PMID: 27381399 DOI: 10.1128/aac.00980-16] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 06/24/2016] [Indexed: 01/23/2023] Open
Abstract
Photocatalysis describes the excitation of titanium dioxide nanoparticles (a wide-band gap semiconductor) by UVA light to produce reactive oxygen species (ROS) that can destroy many organic molecules. This photocatalysis process is used for environmental remediation, while antimicrobial photocatalysis can kill many classes of microorganisms and can be used to sterilize water and surfaces and possibly to treat infections. Here we show that addition of the nontoxic inorganic salt potassium iodide to TiO2 (P25) excited by UVA potentiated the killing of Gram-positive bacteria, Gram-negative bacteria, and fungi by up to 6 logs. The microbial killing depended on the concentration of TiO2, the fluence of UVA light, and the concentration of KI (the best effect was at 100 mM). There was formation of long-lived antimicrobial species (probably hypoiodite and iodine) in the reaction mixture (detected by adding bacteria after light), but short-lived antibacterial reactive species (bacteria present during light) produced more killing. Fluorescent probes for ROS (hydroxyl radical and singlet oxygen) were quenched by iodide. Tri-iodide (which has a peak at 350 nm and a blue product with starch) was produced by TiO2-UVA-KI but was much reduced when methicillin-resistant Staphylococcus aureus (MRSA) cells were also present. The model tyrosine substrate N-acetyl tyrosine ethyl ester was iodinated in a light dose-dependent manner. We conclude that UVA-excited TiO2 in the presence of iodide produces reactive iodine intermediates during illumination that kill microbial cells and long-lived oxidized iodine products that kill after light has ended.
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137
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Chang KL, Sun Q, Peng YP, Lai SW, Sung M, Huang CY, Kuo HW, Sun J, Lin YC. Cu2O loaded titanate nanotube arrays for simultaneously photoelectrochemical ibuprofen oxidation and hydrogen generation. CHEMOSPHERE 2016; 150:605-614. [PMID: 26899855 DOI: 10.1016/j.chemosphere.2016.02.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 02/01/2016] [Accepted: 02/03/2016] [Indexed: 06/05/2023]
Abstract
A p-n junction Cu2O doped TiO2 nanotube arrays (Cu2O/TNAs) were synthesized by square wave voltammetry electrochemical (SWVE) deposition method and employed as the working anode. The crystalline, optical properties, surface morphology, and structure of the Cu2O/TNAs were characterized by XRD, UV-vis absorbance edges, SEM, and XPS. Results showed that the Cu2O/TNAs were dominated by anatase phase after sintering at 450 °C with significant visible light response. XPS finding confirmed XRD results that the copper element in Cu2O/TNAs was Cu (I) instead of Cu (II). SEM images illustrated the diameter and the length of supported TiO2 nanotubes was approximately 100 nm and 2.75-4.34 μm, respectively. After Cu2O doping, the nano-tubular structure of TiO2 nanotube kept its integrity with no significant morphological change, which was beneficial for PEC applications. The photocurrent of Cu2O/TNAs was 1.45 times larger than that of TNAs, implying that Cu2O doping significantly enhanced electron mobility by reducing the recombination of electron-hole pairs. In addition, electrochemical impedance spectroscopy (EIS) measurements revealed that the recombination of photogenerated electron-hole pairs was inhibited as the bias potential was applied. Results of Bode plot further demonstrated that the electron lifetime τel of Cu2O/TNAs-20 (30.79 ms), under 0.5 V bias potential, was about 2.23 times higher than that of pure TNAs (13.82 ms). Results of electron spin resonance (ESR) analyses demonstrate that the hydroxyl radicals (OH) are responsible for the PEC decomposition of Ibuprofen.
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Affiliation(s)
- Ken-Lin Chang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, China; Research Centre for Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, China
| | - Qiannan Sun
- College of Environment and Energy, South China University of Technology, Guangzhou, China
| | - Yen-Ping Peng
- Department of Environmental Science and Engineering, Tunghai University, Taichung, Taiwan.
| | - Shiau-Wu Lai
- Department of Environmental Science and Engineering, Tunghai University, Taichung, Taiwan
| | - Menghau Sung
- Department of Environmental Science and Engineering, Tunghai University, Taichung, Taiwan
| | - Chi-Yu Huang
- Department of Environmental Science and Engineering, Tunghai University, Taichung, Taiwan
| | - Hsion-Wen Kuo
- Department of Environmental Science and Engineering, Tunghai University, Taichung, Taiwan
| | - Jian Sun
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, China
| | - Yi-Ching Lin
- Department of Environmental Science and Engineering, Tunghai University, Taichung, Taiwan
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138
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Zielińska-Jurek A, Wysocka I, Janczarek M, Stampor W, Hupka J. Preparation and characterization of Pt–N/TiO 2 photocatalysts and their efficiency in degradation of recalcitrant chemicals. Sep Purif Technol 2015. [DOI: 10.1016/j.seppur.2015.10.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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139
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UV-induced reactions of Mg 2+ -doped anatase nanocrystals with exposed {0 0 1} facets: An EPR study. J Catal 2015. [DOI: 10.1016/j.jcat.2015.08.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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140
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Dvoranová D, Barbieriková Z, Dorotíková S, Malček M, Brincko A, Rišpanová L, Bučinský L, Staško A, Brezová V, Rapta P. Redox processes of 2,6-dichlorophenolindophenolate in different solvents. A combined electrochemical, spectroelectrochemical, photochemical, and theoretical study. J Solid State Electrochem 2015. [DOI: 10.1007/s10008-015-2823-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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141
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Kopylovich MN, Ribeiro AP, Alegria EC, Martins NM, Martins LM, Pombeiro AJ. Catalytic Oxidation of Alcohols. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2015. [DOI: 10.1016/bs.adomc.2015.02.004] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Marucco A, Carella E, Fenoglio I. A comparative study on the efficacy of different probes to predict the photo-activity of nano-titanium dioxide toward biomolecules. RSC Adv 2015. [DOI: 10.1039/c5ra14303a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A systematic study has been performed to select cell-free tests able to predict the photo-activity of nano-TiO2 in living organisms.
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Affiliation(s)
- A. Marucco
- Dip. Chimica
- “G. Scansetti” Interdepartmental Centre for Studies on Asbestos and Other Toxic Particulates
- NIS – Nanostructured Interfaces and Surfaces
- University of Torino
- Italy
| | - E. Carella
- Dip. Chimica
- “G. Scansetti” Interdepartmental Centre for Studies on Asbestos and Other Toxic Particulates
- NIS – Nanostructured Interfaces and Surfaces
- University of Torino
- Italy
| | - I. Fenoglio
- Dip. Chimica
- “G. Scansetti” Interdepartmental Centre for Studies on Asbestos and Other Toxic Particulates
- NIS – Nanostructured Interfaces and Surfaces
- University of Torino
- Italy
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