601
|
Lei Y, Zhu C, Lu J, Chen R, Xiao J, Peng S. Photochemical transformation of dimethyl phthalate (DMP) with N(iii)(H2ONO+/HONO/NO2−) in the atmospheric aqueous environment. Photochem Photobiol Sci 2018; 17:332-341. [DOI: 10.1039/c7pp00283a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The primary step of photochemical transformation of dimethyl phthalate (DMP) with N(iii) is ˙OH-addition on the aromatic ring of DMP to form a DMP–OH adduct, followed by several decay channels and corresponding rate constants are determined.
Collapse
Affiliation(s)
- Yu Lei
- School of Resource and Environmental Engineering
- Hefei University of Technology
- Hefei 230009
- P. R. China
| | - Chengzhu Zhu
- School of Resource and Environmental Engineering
- Hefei University of Technology
- Hefei 230009
- P. R. China
| | - Jun Lu
- Center of Analysis & Measurement
- Hefei University of Technology
- Hefei 230009
- P. R. China
| | - Rong Chen
- School of Resource and Environmental Engineering
- Hefei University of Technology
- Hefei 230009
- P. R. China
| | - Jun Xiao
- School of Resource and Environmental Engineering
- Hefei University of Technology
- Hefei 230009
- P. R. China
| | - Shuchuan Peng
- School of Resource and Environmental Engineering
- Hefei University of Technology
- Hefei 230009
- P. R. China
| |
Collapse
|
602
|
Donadelli JA, García Einschlag FS, Laurenti E, Magnacca G, Carlos L. Soybean peroxidase immobilized onto silica-coated superparamagnetic iron oxide nanoparticles: Effect of silica layer on the enzymatic activity. Colloids Surf B Biointerfaces 2018; 161:654-661. [PMID: 29169120 DOI: 10.1016/j.colsurfb.2017.11.043] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 11/09/2017] [Accepted: 11/16/2017] [Indexed: 11/17/2022]
Abstract
Peroxidase immobilization onto magnetic supports is considered an innovative strategy for the development of technologies that involves enzymes in wastewater treatment. In this work, magnetic biocatalysts were prepared by immobilization of soybean peroxidase (SBP) onto different silica-coated superparamagnetic iron oxide nanoparticles. The obtained magnetic biocatalysts were tested for the degradation of malachite green (MG), a pollutant often found in industrial wastewaters and with significant drawbacks for the human and environmental health. A deep physicochemical characterization of the materials was performed by means of X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), High Resolution-Transmission Electron Microscope (HR-TEM) and magnetization measurements among others techniques. Results showed high immobilization yield of SBP onto nanomaterials with excellent properties for magnetic recoverability. A partial loss of activity with respect to free SBP was observed, compatible with the modification of the conformational structure of the enzyme after immobilization. The structural modification depended on the amount (and thickness) of silica present in the hybrid materials and the activity yield of 43% was obtained for the best biocatalyst. Thermal stability and reusability capacity were also evaluated.
Collapse
Affiliation(s)
- Jorge A Donadelli
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CCT-La Plata-CONICET, Universidad Nacional de La Plata, Diag 113 y 64, La Plata, Argentina
| | - Fernando S García Einschlag
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CCT-La Plata-CONICET, Universidad Nacional de La Plata, Diag 113 y 64, La Plata, Argentina
| | - Enzo Laurenti
- University of Torino, Department of Chemistry, Via P. Giuria 7, 10125, Torino, Italy
| | - Giuliana Magnacca
- University of Torino, Department of Chemistry, Via P. Giuria 7, 10125, Torino, Italy; NIS Interdepartmental Centre, Via P. Giuria 7, 10125, Torino, Italy
| | - Luciano Carlos
- Instituto de Investigación y Desarrollo en Ingeniería de Procesos, Biotecnología y Energías Alternativas, PROBIEN (CONICET-UNCo), Buenos Aires, 1400, Neuquén, Argentina.
| |
Collapse
|
603
|
Rutely C. BC, Jean-M. F, Walter Z. T, Xochitl DB, Mika S. Towards reliable quantification of hydroxyl radicals in the Fenton reaction using chemical probes. RSC Adv 2018; 8:5321-5330. [PMID: 35542446 PMCID: PMC9078104 DOI: 10.1039/c7ra13209c] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Accepted: 01/22/2018] [Indexed: 11/21/2022] Open
Abstract
Quantification of hydroxyl radical concentration using two chemical probes was assessed through the Fenton reaction. The probes were 1,2-benzopyrone (coumarin) for fluorescence and 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) for electron spin resonance (ESR). The corresponding hydroxylated species, namely 7-hydroxycoumarin (7HC) and 2-hydroxy-5,5-dimethyl-1-pyrroline-N-oxide (DMPO-OH adduct), were monitored by fluorescence and ESR-spin trapping techniques, respectively. The experiments were designed according to the theoretical conditions determined for stable fluorescence and EPR signals. The results demonstrate that: the optimal [chemical probe] : [H2O2] ratio predicted by a simplified quasi-steady-state model was in good agreement with the optimal [chemical probe] : [H2O2] ratio observed experimentally for [H2O2] : [Fe2+] = 10, and the proper adjustment of the [chemical probe] : [H2O2] ratio at a given concentration of the Fenton's reagent improves the detected amount of hydroxyl radicals. Finally, using DMPO required a higher concentration compared to coumarin to yield the same amount of ˙OH detected but resulted in a more reliable probe for detecting ˙OH under the consideration of this study. Quantification of hydroxyl radical concentration using two chemical probes was assessed through the Fenton reaction.![]()
Collapse
Affiliation(s)
- Burgos Castillo Rutely C.
- Laboratory of Green Chemistry
- School of Engineering Science
- Lappeenranta University of Technology
- Finland
- Separation and Conversion Technologies
| | - Fontmorin Jean-M.
- Laboratory of Green Chemistry
- School of Engineering Science
- Lappeenranta University of Technology
- Finland
| | - Tang Walter Z.
- Department of Civil and Environmental Engineering
- Florida International University
- Miami
- USA
| | - Dominguez-Benetton Xochitl
- Separation and Conversion Technologies
- Flemish Institute for Technological Research (VITO)
- Belgium
- SIM vzw
- Belgium
| | - Sillanpää Mika
- Laboratory of Green Chemistry
- School of Engineering Science
- Lappeenranta University of Technology
- Finland
- Department of Civil and Environmental Engineering
| |
Collapse
|
604
|
Kahoush M, Behary N, Cayla A, Nierstrasz V. Bio-Fenton and Bio-electro-Fenton as sustainable methods for degrading organic pollutants in wastewater. Process Biochem 2018. [DOI: 10.1016/j.procbio.2017.10.003] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
605
|
Reina AC, Martínez-Piernas AB, Bertakis Y, Brebou C, Xekoukoulotakis NP, Agüera A, Sánchez Pérez JA. Photochemical degradation of the carbapenem antibiotics imipenem and meropenem in aqueous solutions under solar radiation. WATER RESEARCH 2018; 128:61-70. [PMID: 29091805 DOI: 10.1016/j.watres.2017.10.047] [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: 07/27/2017] [Revised: 10/19/2017] [Accepted: 10/21/2017] [Indexed: 05/23/2023]
Abstract
This paper deals with the photochemical fate of two representative carbapenem antibiotics, namely imipenem and meropenem, in aqueous solutions under solar radiation. The analytical method employed for the determination of the target compounds in various aqueous matrices, such as ultrapure water, municipal wastewater treatment plant effluents, and river water, at environmentally relevant concentrations, was liquid chromatography coupled with hybrid triple quadrupole-linear ion trap-mass spectrometry. The absorption spectra of both compounds were measured in aqueous solutions at pH values from 6 to 8, and both compounds showed a rather strong absorption band centered at about 300 nm, while their molar absorption coefficient was in the order from 9 × 103-104 L mol-1 cm-1. The kinetics of the photochemical degradation of the target compounds was studied in aqueous solutions under natural solar radiation in a solar reactor with compound parabolic collectors. It was found that the photochemical degradation of both compounds at environmentally relevant concentrations follows first order kinetics and the quantum yield was in the order of 10-3 mol einsten-1. Several parameters were studied, such as solution pH, the presence of nitrate ions and humic acids, and the effect of water matrix. In all cases, it was found that the presence of various organic and inorganic constituents in the aqueous matrices do not contribute significantly, either positively or negatively, to the photochemical degradation of both compounds under natural solar radiation. In a final set of photolysis experiments, the effect of the level of irradiance was studied under simulated solar radiation and it was found that the quantum yield for the direct photodegradation of both compounds remained practically constant by changing the incident solar irradiance from 28 to 50 W m-2.
Collapse
Affiliation(s)
- Alejandro Cabrera Reina
- EUDIM, Escuela Universitaria de Ingeniería Mecánica, Universidad de Tarapacá, Av. General Velásquez, 1775, Arica, Chile
| | | | - Yannis Bertakis
- Department of Environmental Engineering, Technical University of Crete, Polytechneioupolis, GR-73100 Chania, Greece
| | - Christina Brebou
- Department of Environmental Engineering, Technical University of Crete, Polytechneioupolis, GR-73100 Chania, Greece
| | - Nikolaos P Xekoukoulotakis
- Department of Environmental Engineering, Technical University of Crete, Polytechneioupolis, GR-73100 Chania, Greece.
| | - Ana Agüera
- CIESOL, Joint Centre University of Almería-CIEMAT, Almería, Spain.
| | - José Antonio Sánchez Pérez
- CIESOL, Joint Centre University of Almería-CIEMAT, Almería, Spain; Chemical Engineering Department, University of Almería, Spain
| |
Collapse
|
606
|
Ćwieląg-Piasecka I, Witwicki M, Jerzykiewicz M, Jezierska J. Can Carbamates Undergo Radical Oxidation in the Soil Environment? A Case Study on Carbaryl and Carbofuran. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:14124-14134. [PMID: 29171253 DOI: 10.1021/acs.est.7b03386] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Radical oxidation of carbamate insecticides, namely carbaryl and carbofuran, was investigated with spectroscopic (electron paramagnetic resonance [EPR] and UV-vis) and theoretical (density functional theory [DFT] and ab initio orbital-optimized spin-component scaled MP2 [OO-SCS-MP2]) methods. The two carbamates were subjected to reaction with •OH, persistent DPPH• and galvinoxyl radical, as well as indigenous radicals of humic acids. The influence of fulvic acids on carbamate oxidation was also tested. The results obtained with EPR and UV-vis spectroscopy indicate that carbamates can undergo direct reactions with various radical species, oxidizing themselves into radicals in the process. Hence, they are prone to participate in the prolongation step of the radical chain reactions occurring in the soil environment. Theoretical calculations revealed that from the thermodynamic point of view hydrogen atom transfer is the preferred mechanism in the reactions of the two carbamates with the radicals. The activity of carbofuran was determined experimentally (using pseudo-first-order kinetics) and theoretically to be noticeably higher in comparison with carbaryl and comparable with gallic acid. The findings of this study suggest that the radicals present in soil can play an important role in natural remediation mechanisms of carbamates.
Collapse
Affiliation(s)
- Irmina Ćwieląg-Piasecka
- Institute of Soil Science and Environmental Protection, Wroclaw University of Environmental and Life Sciences , Grunwaldzka 53 St., Wroclaw, Poland
| | - Maciej Witwicki
- Faculty of Chemistry, Wroclaw University , 14 F. Joliot-Curie St., 50-383 Wroclaw, Poland
| | - Maria Jerzykiewicz
- Faculty of Chemistry, Wroclaw University , 14 F. Joliot-Curie St., 50-383 Wroclaw, Poland
| | - Julia Jezierska
- Faculty of Chemistry, Wroclaw University , 14 F. Joliot-Curie St., 50-383 Wroclaw, Poland
| |
Collapse
|
607
|
Affiliation(s)
- Martin Klussmann
- Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
| |
Collapse
|
608
|
Cruz-Alcalde A, Sans C, Esplugas S. Priority pesticides abatement by advanced water technologies: The case of acetamiprid removal by ozonation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 599-600:1454-1461. [PMID: 28531953 DOI: 10.1016/j.scitotenv.2017.05.065] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 05/06/2017] [Accepted: 05/07/2017] [Indexed: 06/07/2023]
Abstract
With the aim of exploring treatment alternatives for priority insecticide acetamiprid (ACMP) abatement, the removal of this compound from water by ozonation was studied for the first time, paying special attention to the kinetic, mechanistic and toxicological aspects of the process. The second order rate constants of reactions between ACMP and both molecular ozone (O3) and hydroxyl radicals (OH) were determined to be 0.25M-1s-1 and 2.1·109M-1s-1, respectively. On the basis of kinetic results, the degradation of ACMP during ozonation could be well-explained by the reactivity of this pesticide with OH. HPLC/MS analysis of the ozonated ACMP showed ACMP-N-desmethyl, 6-chloronicotinic acid, N'cyano-N-methyl acetamidine and N'-cyano acetamidine as the major transformation products (TPs), all of them formed through amine α carbon oxidation in combination with hydrolysis. Microtox bioassays revealed an increase in the toxicity of the medium during ACMP ozonation process, followed by a decrease to relatively low values. These changes could be attributed to the synergistic effects between TPs as well as to the presence of toxic intermediate aldehydes. Even though adopting strategies to further promote ozone decomposition to hydroxyl radicals appears to be essential, ozonation can be an effective treatment process for ACMP removal and associated toxicity abatement.
Collapse
Affiliation(s)
- A Cruz-Alcalde
- Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, Universitat de Barcelona, C/Martí i Franqués 1, 08028 Barcelona, Spain.
| | - C Sans
- Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, Universitat de Barcelona, C/Martí i Franqués 1, 08028 Barcelona, Spain
| | - S Esplugas
- Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, Universitat de Barcelona, C/Martí i Franqués 1, 08028 Barcelona, Spain
| |
Collapse
|
609
|
Uraoka M, Maegawa K, Ishizaka S. Raman Spectroscopy of Single Light-Absorbing Carbonaceous Particles Levitated in Air Using an Annular Laser Beam. Anal Chem 2017; 89:12866-12871. [DOI: 10.1021/acs.analchem.7b03455] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Masaru Uraoka
- Department of Chemistry,
Graduate School of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Keisuke Maegawa
- Department of Chemistry,
Graduate School of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Shoji Ishizaka
- Department of Chemistry,
Graduate School of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| |
Collapse
|
610
|
Jiao X, Li Y, Niu J, Xie X, Wang X, Tang B. Small-Molecule Fluorescent Probes for Imaging and Detection of Reactive Oxygen, Nitrogen, and Sulfur Species in Biological Systems. Anal Chem 2017; 90:533-555. [DOI: 10.1021/acs.analchem.7b04234] [Citation(s) in RCA: 334] [Impact Index Per Article: 47.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Xiaoyun Jiao
- College
of Chemistry, Chemical Engineering and Materials Science, Collaborative
Innovation Center of Functionalized Probes for Chemical Imaging in
Universities of Shandong, Key Laboratory of Molecular and Nano Probes,
Ministry of Education, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, P. R. China
| | - Yong Li
- College
of Chemistry, Chemical Engineering and Materials Science, Collaborative
Innovation Center of Functionalized Probes for Chemical Imaging in
Universities of Shandong, Key Laboratory of Molecular and Nano Probes,
Ministry of Education, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, P. R. China
| | - Jinye Niu
- College
of Chemistry, Chemical Engineering and Materials Science, Collaborative
Innovation Center of Functionalized Probes for Chemical Imaging in
Universities of Shandong, Key Laboratory of Molecular and Nano Probes,
Ministry of Education, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, P. R. China
- School
of Chemical Engineering, Shandong University of Technology, Zibo 255049, P. R. China
| | - Xilei Xie
- College
of Chemistry, Chemical Engineering and Materials Science, Collaborative
Innovation Center of Functionalized Probes for Chemical Imaging in
Universities of Shandong, Key Laboratory of Molecular and Nano Probes,
Ministry of Education, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, P. R. China
| | - Xu Wang
- College
of Chemistry, Chemical Engineering and Materials Science, Collaborative
Innovation Center of Functionalized Probes for Chemical Imaging in
Universities of Shandong, Key Laboratory of Molecular and Nano Probes,
Ministry of Education, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, P. R. China
| | - Bo Tang
- College
of Chemistry, Chemical Engineering and Materials Science, Collaborative
Innovation Center of Functionalized Probes for Chemical Imaging in
Universities of Shandong, Key Laboratory of Molecular and Nano Probes,
Ministry of Education, Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, P. R. China
| |
Collapse
|
611
|
Gupta S, Basant N. Modeling the pH and temperature dependence of aqueousphase hydroxyl radical reaction rate constants of organic micropollutants using QSPR approach. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:24936-24946. [PMID: 28918607 DOI: 10.1007/s11356-017-0161-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Accepted: 09/07/2017] [Indexed: 06/07/2023]
Abstract
Designing of advanced oxidation process (AOP) requires knowledge of the aqueous phase hydroxyl radical (●OH) reactions rate constants (k OH), which are strictly dependent upon the pH and temperature of the medium. In this study, pH- and temperature-dependent quantitative structure-property relationship (QSPR) models based on the decision tree boost (DTB) approach were developed for the prediction of k OH of diverse organic contaminants following the OECD guidelines. Experimental datasets (n = 958) pertaining to the k OH values of aqueous phase reactions at different pH (n = 470; 1.4 × 106 to 3.8 × 1010 M-1 s-1) and temperature (n = 171; 1.0 × 107 to 2.6 × 1010 M-1 s-1) were considered and molecular descriptors of the compounds were derived. The Sanderson scale electronegativity, topological polar surface area, number of double bonds, and halogen atoms in the molecule, in addition to the pH and temperature, were found to be the relevant predictors. The models were validated and their external predictivity was evaluated in terms of most stringent criteria parameters derived on the test data. High values of the coefficient of determination (R 2) and small root mean squared error (RMSE) in respective training (> 0.972, ≤ 0.12) and test (≥ 0.936, ≤ 0.16) sets indicated high generalization and predictivity of the developed QSPR model. Other statistical parameters derived from the training and test data also supported the robustness of the models and their suitability for screening new chemicals within the defined chemical space. The developed QSPR models provide a valuable tool for predicting the ●OH reaction rate constants of emerging new water contaminants for their susceptibility to AOPs.
Collapse
Affiliation(s)
- Shikha Gupta
- CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001, India
| | - Nikita Basant
- Environmental and Technical Research Centre, Gomtinagar, Lucknow, 226010, India.
| |
Collapse
|
612
|
Cruz-Alcalde A, Sans C, Esplugas S. Exploring ozonation as treatment alternative for methiocarb and formed transformation products abatement. CHEMOSPHERE 2017; 186:725-732. [PMID: 28820996 DOI: 10.1016/j.chemosphere.2017.08.040] [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: 04/05/2017] [Revised: 07/18/2017] [Accepted: 08/09/2017] [Indexed: 06/07/2023]
Abstract
Despite the high toxicity and resistance to conventional water treatments exhibited by methiocarb (MC), there are no reports regarding the degradation of this priority pesticide by means of alternative purification technologies. In this work, the removal of MC by means of ozonation was studied for the first time, employing a multi-reactor methodology and neutral pH conditions. The second-order rate constants of MC reaction with molecular ozone (O3) and formed hydroxyl radicals (OH·) were determined to be 1.7·106 and 8.2·109 M-1 s-1, respectively. During degradation experiments, direct ozone reaction was observed to effectively remove MC, but not its formed intermediates, whereas OH· could oxidize all species. The major identified TPs were methiocarb sulfoxide (MCX), methiocarb sulfoxide phenol (MCXP) and methiocarb sulfone phenol (MCNP), all of them formed through MC oxidation by O3 or OH· in combination with hydrolysis. A toxicity assessment evidenced a strong dependence on MCX concentration, even at very low values. Despite the OH· capability to degrade MC and its main metabolites, the relative resistance of TPs towards ozone attack enlarged the oxidant dosage (2.5 mg O3/mg DOC) necessary to achieve a relatively low toxicity of the medium. Even though ozonation could be a suitable technique for MC removal from water compartments, strategies aimed to further promote the indirect contribution of hydroxyl radicals during this process should be explored.
Collapse
Affiliation(s)
- A Cruz-Alcalde
- Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, University of Barcelona, C/Martí i Franqués 1, 08028, Barcelona, Spain.
| | - C Sans
- Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, University of Barcelona, C/Martí i Franqués 1, 08028, Barcelona, Spain
| | - S Esplugas
- Department of Chemical Engineering and Analytical Chemistry, Faculty of Chemistry, University of Barcelona, C/Martí i Franqués 1, 08028, Barcelona, Spain
| |
Collapse
|
613
|
Minella M, Giannakis S, Mazzavillani A, Maurino V, Minero C, Vione D. Phototransformation of Acesulfame K in surface waters: Comparison of two techniques for the measurement of the second-order rate constants of indirect photodegradation, and modelling of photoreaction kinetics. CHEMOSPHERE 2017; 186:185-192. [PMID: 28778016 DOI: 10.1016/j.chemosphere.2017.07.128] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 07/18/2017] [Accepted: 07/25/2017] [Indexed: 06/07/2023]
Abstract
By use of photochemical modelling we show that acesulfame K (ACE) can undergo photodegradation in surface waters, mainly by reaction with OH and possibly 3CDOM* (the triplet states of chromophoric dissolved organic matter). With the possible exception of shallow water bodies containing low dissolved organic carbon, we predict ACE to be a refractory compound in environmental waters which agrees well with many literature reports. We used two methods to measure the photoreactivity parameters of ACE, of which one is based on the monitoring of the time evolution of ACE alone and the other is based on the monitoring of both ACE and a reference compound (hereafter, they are referred to as substrate-only and substrate + reference method, respectively). The substrate + reference method can be time-saving, but it is potentially prone to interferences. In this work, ibuprofen and atrazine were used as reference compounds of known behaviour to study the photoreactivity of ACE by competition kinetics in the substrate + reference method. The two methods gave overall comparable results, partially because two different reference compounds instead of only one were used in the substrate + reference method. By so doing, however, one loses part of the time-saving advantage of the substrate + reference method.
Collapse
Affiliation(s)
- Marco Minella
- Dipartimento di Chimica, Università di Torino, Via P. Giuria 5, 10125, Torino, Italy
| | - Stefanos Giannakis
- SB, ISIC, Group of Advanced Oxidation Processes (GPAO), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
| | - Alice Mazzavillani
- Dipartimento di Chimica, Università di Torino, Via P. Giuria 5, 10125, Torino, Italy
| | - Valter Maurino
- Dipartimento di Chimica, Università di Torino, Via P. Giuria 5, 10125, Torino, Italy
| | - Claudio Minero
- Dipartimento di Chimica, Università di Torino, Via P. Giuria 5, 10125, Torino, Italy
| | - Davide Vione
- Dipartimento di Chimica, Università di Torino, Via P. Giuria 5, 10125, Torino, Italy.
| |
Collapse
|
614
|
Bogacki J, Marcinowski P, Zapałowska E, Maksymiec J, Naumczyk J. Cosmetic wastewater treatment by the ZVI/H 2O 2 process. ENVIRONMENTAL TECHNOLOGY 2017; 38:2589-2600. [PMID: 27931173 DOI: 10.1080/09593330.2016.1271020] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 12/07/2016] [Indexed: 06/06/2023]
Abstract
The ZVI/H2O2 process was applied for cosmetic wastewater treatment. Two commercial zero-valent iron (ZVI) types with different granulations were chosen: Hepure Ferrox PRB and Hepure Ferrox Target. In addition, the pH and stirring method influence on ZVI/H2O2 process efficiency was studied. During the ZVI and ZVI/H2O2 processes, linear Fe ions concentration increase was observed. The addition of H2O2 significantly accelerated the iron dissolution process. The highest COD removal was obtained using finer ZVI (Hepure Ferrox Target) for doses of reagents ZVI/H2O2 1500/1600 mg/L, in a H2O2/COD weight ratio 2:1, at pH 3.0 with stirring on a magnetic stirrer. After 120 min of the process, 84.0% COD removal (from 796 to 127 mg/L) was achieved. It was found that the efficiency of the process depends, as in the case of the Fenton process, on the ratio of the reagents (ZVI/H2O2) and their dose in relation to the COD (H2O2/COD) but does not depend on the dose of the iron itself. Statistical analysis confirms that COD removal efficiency depends primarily on H2O2/COD ratio and ZVI granulation, but ZVI dose influence is not statistically significant. The head space, solid-phase microextraction, gas chromatography, mass spectrometry results confirm high efficiency of the ZVI/H2O2 process.
Collapse
Affiliation(s)
- Jan Bogacki
- a Faculty of Building Services, Hydro and Environmental Engineering , Warsaw University of Technology , Warszawa , Poland
| | - Piotr Marcinowski
- a Faculty of Building Services, Hydro and Environmental Engineering , Warsaw University of Technology , Warszawa , Poland
| | - Ewa Zapałowska
- a Faculty of Building Services, Hydro and Environmental Engineering , Warsaw University of Technology , Warszawa , Poland
| | - Justyna Maksymiec
- a Faculty of Building Services, Hydro and Environmental Engineering , Warsaw University of Technology , Warszawa , Poland
| | - Jeremi Naumczyk
- a Faculty of Building Services, Hydro and Environmental Engineering , Warsaw University of Technology , Warszawa , Poland
| |
Collapse
|
615
|
Gupta S, Basant N. Modeling the aqueous phase reactivity of hydroxyl radical towards diverse organic micropollutants: An aid to water decontamination processes. CHEMOSPHERE 2017; 185:1164-1172. [PMID: 28764137 DOI: 10.1016/j.chemosphere.2017.07.057] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2017] [Revised: 07/10/2017] [Accepted: 07/12/2017] [Indexed: 06/07/2023]
Abstract
The rate constants of the hydroxyl radical reactions (kOH) with organic micropollutants (OMPs) in aqueous medium are important in designing the advanced oxidation processes (AOPs) for their removal. In this study, a quantitative structure-property relationship (QSPR) model for the prediction of kOH of diverse and emerging OMPs was developed in accordance with the OECD guidelines. A large experimental data set (n = 995) comprised of compounds with kOH values ranging from 7.9 × 105 to 6.8 × 1010 M-1 s-1 was considered and several molecular descriptors were calculated. As a result, five descriptors were found to be important in predicting the kOH values which related to the electronegativity, topological polar surface area, double bonds, average molecular weight, and halogen atoms in the molecule. The optimal model was validated internally and externally and several statistical stringent parameters were derived. High values of the coefficient of determination (R2) and small root mean squared error (RMSE) in the training (0.954; 0.17) and validation (0.925; 0.14) sets indicated high generalization and predictivity of the developed model. Other statistical parameters derived from the training and validation data also supported the robustness of the model. The proposed model outperformed the earlier QSARs reported for kOH prediction. Overall, the developed QSPR model provides a valuable tool for an initial assessment of the susceptibility of organic micropollutants to AOPs.
Collapse
Affiliation(s)
- Shikha Gupta
- CSIR- National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001, India
| | - Nikita Basant
- Environmental and Technical Research Centre, Gomtinagar, Lucknow, 226010, India.
| |
Collapse
|
616
|
Chai Q, Wu Q, Liu T, Tan L, Fu C, Ren X, Yang Y, Meng X. Enhanced antibacterial activity of silica nanorattles with ZnO combination nanoparticles against methicillin-resistant Staphylococcus aureus. Sci Bull (Beijing) 2017; 62:1207-1215. [PMID: 36659515 DOI: 10.1016/j.scib.2017.08.016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 06/02/2017] [Accepted: 06/12/2017] [Indexed: 01/21/2023]
Abstract
Silica nanorattles (SNs) with zinc oxide (ZnO) combination nanoparticles are reported to inhibit methicillin-resistant Staphylococcus aureus (MRSA) for the first time. SNs loaded with ZnO nanoparticles, which can produce free radicals, can cause severe damage to bacteria. ZnO nanoparticles not only provide free radicals in the combined nanostructures, which can inhibit the growth of bacteria, but also form nanorough surfaces with an irregular distribution of spikes on the SNs, which can enhance their adhesion to bacteria. Nanorough silica shell surfaces maintain the high activity and stability of small-sized ZnO nanoparticles and gather ZnO nanoparticles together to enhance production, which improves the efficiency of free radicals against the cytomembranes of bacterial cells. The enhanced adhesion of ZnO@SN nanoparticles to MRSA cells shortens the effective touching distance between free radicals and MRSA, which also improves antibacterial activity. As we expected, the ZnO@SN nanoparticles exhibit a better antibacterial effect than free ZnO nanoparticles against MRSA in vitro and in vivo. We also demonstrate that SNs loaded with ZnO nanoparticles can accelerate wound healing in MRSA skin inflammation models. This method of multilevel functionalization will be potentially applicable to the antibacterial field.
Collapse
Affiliation(s)
- Qianqian Chai
- Laboratory of Controllable Preparation and Application of Nanomaterials, CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qiong Wu
- Laboratory of Controllable Preparation and Application of Nanomaterials, CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tianlong Liu
- Laboratory of Controllable Preparation and Application of Nanomaterials, CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
| | - Longfei Tan
- Laboratory of Controllable Preparation and Application of Nanomaterials, CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Changhui Fu
- Laboratory of Controllable Preparation and Application of Nanomaterials, CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiangling Ren
- Laboratory of Controllable Preparation and Application of Nanomaterials, CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Yue Yang
- Laboratory of Controllable Preparation and Application of Nanomaterials, CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xianwei Meng
- Laboratory of Controllable Preparation and Application of Nanomaterials, CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
| |
Collapse
|
617
|
Trojanowicz M, Bojanowska-Czajka A, Capodaglio AG. Can radiation chemistry supply a highly efficient AO(R)P process for organics removal from drinking and waste water? A review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:20187-20208. [PMID: 28780689 DOI: 10.1007/s11356-017-9836-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 07/25/2017] [Indexed: 06/07/2023]
Abstract
The increasing role of chemistry in industrial production and its direct and indirect impacts in everyday life create the need for continuous search and efficiency improvement of new methods for decomposition/removal of different classes of waterborne anthropogenic pollutants. This review paper addresses a highly promising class of water treatment solutions, aimed at tackling the pressing problem of emerging contaminants in natural and drinking waters and wastewater discharges. Radiation processing, a technology originating from radiation chemistry studies, has shown encouraging results in the treatment of (mainly) organic water pollution. Radiation ("high energy") processing is an additive-free technology using short-lived reactive species formed by the radiolysis of water, both oxidative and reducing, to carry out decomposition of organic pollutants. The paper illustrates the basic principles of radiolytic treatment of organic pollutants in water and wastewaters and specifically of one of its most practical implementations (electron beam processing). Application examples, highlighting the technology's strong points and operational conditions are described, and a discussion on the possible future of this technology follows.
Collapse
Affiliation(s)
- Marek Trojanowicz
- Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195, Warsaw, Poland
- Department of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland
| | | | - Andrea G Capodaglio
- Department of Civil Engineering & Architecture, University of Pavia, Via Ferrata 3, 27100, Pavia, Italy.
| |
Collapse
|
618
|
Kadassery KJ, Dey SK, Cannella AF, Surendhran R, Lacy DC. Photochemical Water-Splitting with Organomanganese Complexes. Inorg Chem 2017; 56:9954-9965. [PMID: 28767229 DOI: 10.1021/acs.inorgchem.7b01483] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Certain organometallic chromophores with water-derived ligands, such as the known [Mn(CO)3(μ3-OH)]4 (1) tetramer, drew our attention as possible platforms to study water-splitting reactions. Herein, we investigate the UV irradiation of various tricarbonyl organomanganese complexes, including 1, and demonstrate that dihydrogen, CO, and hydrogen peroxide form as products in a photochemical water-splitting decomposition reaction. The organic and manganese-containing side products are also characterized. Labeling studies with 18O-1 suggest that the source of oxygen atoms in H2O2 originates from free water that interacts with 1 after photochemical dissociation of CO (1-CO) constituting the oxidative half-reaction of water splitting mediated by 1. Hydrogen production from 1 is the result of several different processes, one of which involves the protons derived from the hydroxido ligands in 1 constituting the reductive half-reaction of water splitting mediated by 1. Other processes that generate H2 are also operative and are described. Collectively the results from the photochemical decomposition of 1 provide an opportunity to propose a mechanism, and it is discussed within the context of developing new strategies for water-splitting reactions with organomanganese complexes.
Collapse
Affiliation(s)
- Karthika J Kadassery
- Department of Chemistry, University at Buffalo, State University of New York , Buffalo, New York 14260, United States
| | - Suman Kr Dey
- Department of Chemistry, University at Buffalo, State University of New York , Buffalo, New York 14260, United States
| | - Anthony F Cannella
- Department of Chemistry, University at Buffalo, State University of New York , Buffalo, New York 14260, United States
| | - Roshaan Surendhran
- Department of Chemistry, University at Buffalo, State University of New York , Buffalo, New York 14260, United States
| | - David C Lacy
- Department of Chemistry, University at Buffalo, State University of New York , Buffalo, New York 14260, United States
| |
Collapse
|
619
|
Song G, Bozzelli JW. Structures and thermochemistry of methyl ethyl sulfide and its hydroperoxides: HOOCH2
SCH2
CH3
, CH3
SCH(OOH)CH3
, CH3
SCH2
CH2
OOH, and radicals. J PHYS ORG CHEM 2017. [DOI: 10.1002/poc.3751] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Guanghui Song
- Department of Chemical, Biological, and Pharmaceutical Engineering; New Jersey Institute of Technology, University Heights; Newark NJ USA
| | - Joseph W. Bozzelli
- Department of Chemical, Biological, and Pharmaceutical Engineering; New Jersey Institute of Technology, University Heights; Newark NJ USA
| |
Collapse
|
620
|
Kawade MN, Srinivas D, Upadhyaya HP. Kinetics of gas phase OH radical reaction with thiophene in the 272–353 K temperature range: A laser induced fluorescence study. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.05.072] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
621
|
Salimi M, Esrafili A, Gholami M, Jonidi Jafari A, Rezaei Kalantary R, Farzadkia M, Kermani M, Sobhi HR. Contaminants of emerging concern: a review of new approach in AOP technologies. ENVIRONMENTAL MONITORING AND ASSESSMENT 2017; 189:414. [PMID: 28741247 DOI: 10.1007/s10661-017-6097-x] [Citation(s) in RCA: 115] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 06/23/2017] [Indexed: 05/06/2023]
Abstract
The presence of contaminants of emerging concern (CECs) such as pharmaceuticals and personal care products (PPCPs), endocrine-disrupting compounds (EDCs), flame retardants (FRs), pesticides, and artificial sweeteners (ASWs) in the aquatic environments remains a major challenge to the environment and human health. In this review, the classification and occurrence of emerging contaminants in aquatic environments were discussed in detail. It is well documented that CECs are susceptible to poor removal during the conventional wastewater treatment plants, which introduce them back to the environment ranging from nanogram per liter (e.g., carbamazepine) up to milligram per liter (e.g., acesulfame) concentration level. Meanwhile, a deep insight into the application of advanced oxidation processes (AOPs) on mitigation of the CECs from aquatic environment was presented. In this regard, the utilization of various treatment technologies based on AOPs including ozonation, Fenton processes, sonochemical, and TiO2 heterogeneous photocatalysis was reviewed. Additionally, some innovations (e.g., visible light heterogeneous photocatalysis, electro-Fenton) concerning the AOPs and the combined utilization of AOPs (e.g., sono-Fenton) were documented.
Collapse
Affiliation(s)
- Maryam Salimi
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | - Ali Esrafili
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran.
| | - Mitra Gholami
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | - Ahmad Jonidi Jafari
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | - Roshanak Rezaei Kalantary
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | - Mahdi Farzadkia
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | - Majid Kermani
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | | |
Collapse
|
622
|
Chang K, Liu Z, Fang X, Chen H, Men X, Yuan Y, Sun K, Zhang X, Yuan Z, Wu C. Enhanced Phototherapy by Nanoparticle-Enzyme via Generation and Photolysis of Hydrogen Peroxide. NANO LETTERS 2017; 17:4323-4329. [PMID: 28613898 DOI: 10.1021/acs.nanolett.7b01382] [Citation(s) in RCA: 147] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Light has been widely used for cancer therapeutics such as photodynamic therapy (PDT) and photothermal therapy. This paper describes a strategy called enzyme-enhanced phototherapy (EEPT) for cancer treatment. We constructed a nanoparticle platform by covalent conjugation of glucose oxidase (GOx) to small polymer dots, which could be persistently immobilized into a tumor. While the malignant tumors have high glucose uptake, the GOx efficiently catalyzes the glucose oxidation with simultaneous generation of H2O2. Under light irradiation, the in situ generated H2O2 was photolyzed to produce hydroxyl radical, the most reactive oxygen species, for killing cancer cells. In vitro assays indicated that the cancer cells were destroyed by using a nanoparticle concentration at 0.2 μg/mL and a light dose of ∼120 J/cm2, indicating the significantly enhanced efficiency of the EEPT method when compared to typical PDT that requires a photosensitizer of >10 μg/mL for effective cell killing under the same light dose. Furthermore, remarkable inhibition of tumor growth was observed in xenograft-bearing mice, indicating the promise of the EEPT approach for cancer therapeutics.
Collapse
Affiliation(s)
- Kaiwen Chang
- Department of Biomedical Engineering, Southern University of Science and Technology , Shenzhen, Guangdong 518055, China
- Faculty of Health Sciences, University of Macau , Taipa, Macau SAR China
| | - Zhihe Liu
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , Changchun, Jilin 130012, China
| | - Xiaofeng Fang
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , Changchun, Jilin 130012, China
| | - Haobin Chen
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , Changchun, Jilin 130012, China
| | - Xiaoju Men
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , Changchun, Jilin 130012, China
| | - Ye Yuan
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , Changchun, Jilin 130012, China
| | - Kai Sun
- State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , Changchun, Jilin 130012, China
| | - Xuanjun Zhang
- Faculty of Health Sciences, University of Macau , Taipa, Macau SAR China
| | - Zhen Yuan
- Faculty of Health Sciences, University of Macau , Taipa, Macau SAR China
| | - Changfeng Wu
- Department of Biomedical Engineering, Southern University of Science and Technology , Shenzhen, Guangdong 518055, China
| |
Collapse
|
623
|
Barsotti F, Bartels-Rausch T, De Laurentiis E, Ammann M, Brigante M, Mailhot G, Maurino V, Minero C, Vione D. Photochemical Formation of Nitrite and Nitrous Acid (HONO) upon Irradiation of Nitrophenols in Aqueous Solution and in Viscous Secondary Organic Aerosol Proxy. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:7486-7495. [PMID: 28581723 DOI: 10.1021/acs.est.7b01397] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Irradiated nitrophenols can produce nitrite and nitrous acid (HONO) in bulk aqueous solutions and in viscous aqueous films, simulating the conditions of a high-solute-strength aqueous aerosol, with comparable quantum yields in solution and viscous films (10-5-10-4 in the case of 4-nitrophenol) and overall reaction yields up to 0.3 in solution. The process is particularly important for the para-nitrophenols, possibly because their less sterically hindered nitro groups can be released more easily as nitrite and HONO. The nitrophenols giving the highest photoproduction rates of nitrite and HONO (most notably, 4-nitrophenol and 2-methyl-4-nitrophenol) could significantly contribute to the occurrence of nitrite in aqueous phases in contact with the atmosphere. Interestingly, dew-water evaporation has shown potential to contribute to the gas-phase HONO levels during the morning, which accounts for the possible importance of the studied process.
Collapse
Affiliation(s)
- Francesco Barsotti
- Dipartimento di Chimica, Università di Torino , Via Pietro Giuria 5, 10125 Torino, Italy
| | | | - Elisa De Laurentiis
- Dipartimento di Chimica, Università di Torino , Via Pietro Giuria 5, 10125 Torino, Italy
| | - Markus Ammann
- Laboratory of Environmental Chemistry, Paul Scherrer Institute , 5232 Villigen, Switzerland
| | - Marcello Brigante
- Université Clermont Auvergne , CNRS, Sigma Clermont, Institut de Chimie de Clermont-Ferrand, F-63000 Clermont-Ferrand, France
| | - Gilles Mailhot
- Université Clermont Auvergne , CNRS, Sigma Clermont, Institut de Chimie de Clermont-Ferrand, F-63000 Clermont-Ferrand, France
| | - Valter Maurino
- Dipartimento di Chimica, Università di Torino , Via Pietro Giuria 5, 10125 Torino, Italy
| | - Claudio Minero
- Dipartimento di Chimica, Università di Torino , Via Pietro Giuria 5, 10125 Torino, Italy
| | - Davide Vione
- Dipartimento di Chimica, Università di Torino , Via Pietro Giuria 5, 10125 Torino, Italy
- Centro Interdipartimentale NatRisk, Università di Torino , Largo Paolo Braccini 2, 10095 Grugliasco, Torino, Italy
| |
Collapse
|
624
|
Gutiérrez-Zapata HM, Alvear-Daza JJ, Rengifo-Herrera JA, Sanabria J. Addition of Hydrogen Peroxide to Groundwater with Natural Iron Induces Water Disinfection by Photo-Fenton at Circumneutral pH and other Photochemical Events. Photochem Photobiol 2017; 93:1224-1231. [DOI: 10.1111/php.12779] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 03/17/2017] [Indexed: 01/21/2023]
Affiliation(s)
- Héctor Mario Gutiérrez-Zapata
- Environmental Microbiology and Biotechnology Laboratory; Engineering School of Environmental & Natural Resources; Engineering Faculty; Universidad del Valle - Sede Meléndez; Cali Colombia
| | - John Jairo Alvear-Daza
- Environmental Microbiology and Biotechnology Laboratory; Engineering School of Environmental & Natural Resources; Engineering Faculty; Universidad del Valle - Sede Meléndez; Cali Colombia
| | - Julián Andrés Rengifo-Herrera
- Centro de Investigación y Desarrollo en Ciencias Aplicadas “Dr. J.J. Ronco” (CINDECA); Departamento de Química; Facultad de Ciencias Exactas; UNLP-CCT La Plata; La Plata Buenos Aires Argentina
| | - Janeth Sanabria
- Environmental Microbiology and Biotechnology Laboratory; Engineering School of Environmental & Natural Resources; Engineering Faculty; Universidad del Valle - Sede Meléndez; Cali Colombia
| |
Collapse
|
625
|
Sah C, Jacob L, Saraswat M, Venkataramani S. Does a Nitrogen Lone Pair Lead to Two Centered-Three Electron (2c-3e) Interactions in Pyridyl Radical Isomers? J Phys Chem A 2017; 121:3781-3791. [PMID: 28423280 DOI: 10.1021/acs.jpca.7b01501] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Each of the three isomeric pyridyl radicals (2-, 3-, and 4-dehydropyridines) contains a lone pair and an unpaired electron. As a result, a potential two centered-three electron interaction between the radical electron and the lone pair through-space (TS) and/or through-bond (TB) can exist that may influence the stability of the radicals. Due to the change in geometrical positions relative to each other, the strength of interaction can be varied. In this study, we investigated the structural and stability aspects of pyridyl radical isomers with a major emphasis on the interaction of a nitrogen lone pair with the radical center. In order to obtain evidence for such interactions, protonated and N-oxide analogues of the corresponding isomeric pyridyl radicals have been considered in such a way to understand the consequences due to unavailability of the lone pair. Similarly, electron attachment and detachment energies at the radical center (vertical detachment energy, VDE, of corresponding anions and vertical ionization energy, VIE, of radical isomers) have been calculated to find out the interaction trend upon modification at the radical center. Different levels of theory including (U)B3LYP/cc-pVTZ, (U)M06/cc-pVTZ, CBS-QB3, single-point energy calculations at (U)CCSD(T)/cc-pVTZ, and multireference CASSCF/cc-pVTZ methods have been employed in this regard. A closer inspection of geometries, relative stability order, spin density, electrostatic potential, molecular orbitals, NBO analysis, and vibrational analysis have showed a strong and stabilizing TS interaction between the radical center and the lone pair in the case of the 2-pyridyl radical. On the other hand, the 4-pyridyl radical showed stabilizing interactions only via TB coupling, whereas the TS interaction is nonexistent. Despite the presence of both interactions in the case of the 3-pyridyl radical, their overall influence is less effective toward stability.
Collapse
Affiliation(s)
- Chitranjan Sah
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali , Sector 81, SAS Nagar, Knowledge City, Mohali, Punjab 140306, India
| | - Lilit Jacob
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali , Sector 81, SAS Nagar, Knowledge City, Mohali, Punjab 140306, India
| | - Mayank Saraswat
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali , Sector 81, SAS Nagar, Knowledge City, Mohali, Punjab 140306, India
| | - Sugumar Venkataramani
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali , Sector 81, SAS Nagar, Knowledge City, Mohali, Punjab 140306, India
| |
Collapse
|
626
|
Li H, Shang J, Yang Z, Shen W, Ai Z, Zhang L. Oxygen Vacancy Associated Surface Fenton Chemistry: Surface Structure Dependent Hydroxyl Radicals Generation and Substrate Dependent Reactivity. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:5685-5694. [PMID: 28418239 DOI: 10.1021/acs.est.7b00040] [Citation(s) in RCA: 175] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Understanding the chemistry of hydrogen peroxide (H2O2) decomposition and hydroxyl radical (•OH) transformation on the surface molecular level is a great challenge for the application of heterogeneous Fenton system in the fields of chemistry, environmental, and life science. We report in this study a conceptual oxygen vacancy associated surface Fenton system without any metal ions leaching, exhibiting unprecedented surface chemistry based on the oxygen vacancy of electron-donor nature for heterolytic H2O2 dissociation. By controlling the delicate surface structure of catalyst, this novel Fenton system allows the facile tuning of •OH existing form for targeted catalytic reactions with controlled reactivity and selectivity. On the model catalyst of BiOCl, the generated •OH tend to diffuse away from the (001) surface for the selective oxidation of dissolved pollutants in solution, but prefer to stay on the (010) surface, reacting with strongly adsorbed pollutants with high priority. These findings will extend the scope of Fenton catalysts via surface engineering and consolidate the fundamental theories of Fenton reactions for wide environmental applications.
Collapse
Affiliation(s)
- Hao Li
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, Central China Normal University , Wuhan 430079, P. R. China
| | - Jian Shang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, Central China Normal University , Wuhan 430079, P. R. China
| | - Zhiping Yang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, Central China Normal University , Wuhan 430079, P. R. China
| | - Wenjuan Shen
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, Central China Normal University , Wuhan 430079, P. R. China
| | - Zhihui Ai
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, Central China Normal University , Wuhan 430079, P. R. China
| | - Lizhi Zhang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental Chemistry, Central China Normal University , Wuhan 430079, P. R. China
| |
Collapse
|
627
|
Yuan M, Tian F, Li G, Zhao H, Liu Y, Chen R. Fe(III)-Modified BiOBr Hierarchitectures for Improved Photocatalytic Benzyl Alcohol Oxidation and Organic Pollutants Degradation. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b00905] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mengqian Yuan
- School
of Chemistry and Environmental Engineering and Key Laboratory for
Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Xiongchu Avenue, Wuhan, 430073, P. R. China
| | - Fan Tian
- School
of Chemistry and Environmental Engineering and Key Laboratory for
Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Xiongchu Avenue, Wuhan, 430073, P. R. China
| | - Guangfang Li
- School
of Chemistry and Environmental Engineering and Key Laboratory for
Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Xiongchu Avenue, Wuhan, 430073, P. R. China
| | - Huiping Zhao
- School
of Chemistry and Environmental Engineering and Key Laboratory for
Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Xiongchu Avenue, Wuhan, 430073, P. R. China
| | - Yunling Liu
- State
Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Rong Chen
- School
of Chemistry and Environmental Engineering and Key Laboratory for
Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Xiongchu Avenue, Wuhan, 430073, P. R. China
| |
Collapse
|
628
|
Guan N, Li J, Shin HD, Du G, Chen J, Liu L. Microbial response to environmental stresses: from fundamental mechanisms to practical applications. Appl Microbiol Biotechnol 2017; 101:3991-4008. [PMID: 28409384 DOI: 10.1007/s00253-017-8264-y] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Revised: 03/23/2017] [Accepted: 03/27/2017] [Indexed: 10/19/2022]
Abstract
Environmental stresses are usually active during the process of microbial fermentation and have significant influence on microbial physiology. Microorganisms have developed a series of strategies to resist environmental stresses. For instance, they maintain the integrity and fluidity of cell membranes by modulating their structure and composition, and the permeability and activities of transporters are adjusted to control nutrient transport and ion exchange. Certain transcription factors are activated to enhance gene expression, and specific signal transduction pathways are induced to adapt to environmental changes. Besides, microbial cells also have well-established repair mechanisms that protect their macromolecules against damages inflicted by environmental stresses. Oxidative, hyperosmotic, thermal, acid, and organic solvent stresses are significant in microbial fermentation. In this review, we summarize the modus operandi by which these stresses act on cellular components, as well as the corresponding resistance mechanisms developed by microorganisms. Then, we discuss the applications of these stress resistance mechanisms on the production of industrially important chemicals. Finally, we prospect the application of systems biology and synthetic biology in the identification of resistant mechanisms and improvement of metabolic robustness of microorganisms in environmental stresses.
Collapse
Affiliation(s)
- Ningzi Guan
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China.,School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Jianghua Li
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China.,Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China
| | - Hyun-Dong Shin
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
| | - Guocheng Du
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China.,Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China
| | - Jian Chen
- Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China
| | - Long Liu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China. .,Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China.
| |
Collapse
|
629
|
Degradation of Methyl 2-Aminobenzoate (Methyl Anthranilate) by H₂O₂/UV: Effect of Inorganic Anions and Derived Radicals. Molecules 2017; 22:molecules22040619. [PMID: 28417930 PMCID: PMC6154702 DOI: 10.3390/molecules22040619] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 04/03/2017] [Accepted: 04/06/2017] [Indexed: 12/04/2022] Open
Abstract
This study shows that methyl 2-aminobenzoate (also known as methyl anthranilate, hereafter MA) undergoes direct photolysis under UVC and UVB irradiation and that its photodegradation is further accelerated in the presence of H2O2. Hydrogen peroxide acts as a source of hydroxyl radicals (·OH) under photochemical conditions and yields MA hydroxyderivatives. The trend of MA photodegradation rate vs. H2O2 concentration reaches a plateau because of the combined effects of H2O2 absorption saturation and ·OH scavenging by H2O2. The addition of chloride ions causes scavenging of ·OH, yielding Cl2·− as the most likely reactive species, and it increases the MA photodegradation rate at high H2O2 concentration values. The reaction between Cl2·− and MA, which has second-order rate constant kCl2•−+MA = (4.0 ± 0.3) × 108 M−1·s−1 (determined by laser flash photolysis), appears to be more selective than the ·OH process in the presence of H2O2, because Cl2·− undergoes more limited scavenging by H2O2 compared to ·OH. While the addition of carbonate causes ·OH scavenging to produce CO3·− (kCO3•−+MA = (3.1 ± 0.2) × 108 M−1·s−1), carbonate considerably inhibits the photodegradation of MA. A possible explanation is that the elevated pH values of the carbonate solutions make H2O2 to partially occur as HO2−, which reacts very quickly with either ·OH or CO3·− to produce O2·−. The superoxide anion could reduce partially oxidised MA back to the initial substrate, with consequent inhibition of MA photodegradation. Fast MA photodegradation is also observed in the presence of persulphate/UV, which yields SO4·− that reacts effectively with MA (kSO4•−+MA = (5.6 ± 0.4) × 109 M−1·s−1). Irradiated H2O2 is effective in photodegrading MA, but the resulting MA hydroxyderivatives are predicted to be about as toxic as the parent compound for aquatic organisms (most notably, fish and crustaceans).
Collapse
|
630
|
Reaction mechanisms of DNT with hydroxyl radicals for advanced oxidation processes—a DFT study. J Mol Model 2017; 23:139. [DOI: 10.1007/s00894-017-3277-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Accepted: 02/06/2017] [Indexed: 11/27/2022]
|
631
|
Hydrogen peroxide (H 2O 2) irreversibly inactivates creatine kinase from Pelodiscus sinensis by targeting the active site cysteine. Int J Biol Macromol 2017; 105:1595-1601. [PMID: 28279764 DOI: 10.1016/j.ijbiomac.2017.03.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 03/03/2017] [Accepted: 03/05/2017] [Indexed: 12/30/2022]
Abstract
Creatine kinase (EC 2.7.3.2, CK) plays an important role in cellular energy metabolism and homeostasis by catalysing the transfer of phosphate between ATP and creatine phosphate. In this study, we investigated the effects of H2O2 on PSCKM (muscle type creatine kinase from Pelodiscus sinensis) by the integrating method between enzyme kinetics and docking simulations. We found that H2O2 strongly inactivated PSCKM (IC50=0.25mM) in a first-order kinetic process, and targeted the active site cysteine directly. A conformational study showed that H2O2 did not induce the tertiary structural changes in PSCKM with no extensive exposure of hydrophobic surfaces. Sequential docking simulations between PSCKM and H2O2 indicated that H2O2 interacts with the ADP binding region of the active site, consistent with experimental results that demonstrated H2O2-induced inactivation. Our study demonstrates the effect of H2O2 on PSCKM enzymatic function and unfolding, and provides important insight into the changes undergone by this central metabolic enzyme in ectothermic animals in response to the environment.
Collapse
|
632
|
Gutiérrez-Zapata HM, Rojas KL, Sanabria J, Rengifo-Herrera JA. 2,4-D abatement from groundwater samples by photo-Fenton processes at circumneutral pH using naturally iron present. Effect of inorganic ions. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:6213-6221. [PMID: 27324499 DOI: 10.1007/s11356-016-7067-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Accepted: 06/09/2016] [Indexed: 05/23/2023]
Abstract
This study evaluated, at laboratory scale, if the using iron naturally present (0.3 mg L-1) and adding 10 mg L-1 of hydrogen peroxide was effective to remove 24.3 mgL-1 of 2,4-dichlorophenoxyacetic acid (2,4-D) from groundwater samples by simulated solar irradiation (global intensity = 300 W m-2). Under these conditions, the degradation of 2,4-D reached 75.2 % and the apparition of its main oxidation byproduct 2,4-dichlorophenol (DCP) was observed. On the other hand, pH exhibited an increasing from 7.0 to 8.3 during the experiment. Experiments using Milli-Q water at pH 7.0, iron, and H2O2 concentrations of 0.3 and 10 mg L-1, respectively, were carried out in order to study the effect of ions such as carbonate species, phosphate, and fluoride in typical concentrations often found in groundwater. Ion concentrations were combined by using a factorial experimental design 23. Results showed that carbonates and fluoride did not produce a detrimental effect on the 2,4-D degradation, while phosphate inhibited the process. In this case, the pH increased also from 7.0 to 7.95 and 8.99. Effect of parameters such as pH, iron concentration, and hydrogen peroxide concentration on the 2,4-D degradation by the photo-Fenton process in groundwater was evaluated by using a factorial experimental design 23. Results showed that the pH was the main parameter affecting the process. This study shows for the first time that using the photo-Fenton process at circumneutral pH and iron naturally present seems to be a promising process to remove pesticides from groundwater.
Collapse
Affiliation(s)
- Héctor M Gutiérrez-Zapata
- Environmental Microbiology and Biotechnology Laboratory, Engineering School of Environmental and Natural Resources, Engineering Faculty, Universidad del Valle - Sede Meléndez, A.A. 25360, Calle 13 No. 100-00, Santiago de Cali, Valle, Colombia
| | - Karen L Rojas
- Environmental Microbiology and Biotechnology Laboratory, Engineering School of Environmental and Natural Resources, Engineering Faculty, Universidad del Valle - Sede Meléndez, A.A. 25360, Calle 13 No. 100-00, Santiago de Cali, Valle, Colombia
| | - Janeth Sanabria
- Environmental Microbiology and Biotechnology Laboratory, Engineering School of Environmental and Natural Resources, Engineering Faculty, Universidad del Valle - Sede Meléndez, A.A. 25360, Calle 13 No. 100-00, Santiago de Cali, Valle, Colombia.
| | - Julián Andrés Rengifo-Herrera
- Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. J.J. Ronco" (CINDECA), Departamento de Química, Facultad de Ciencias Exactas, UNLP-CCT La Plata, CONICET, 47 No. 257, 1900, La Plata, Buenos Aires, Argentina.
| |
Collapse
|
633
|
Fabbri D, Maurino V, Minella M, Minero C, Vione D. Modelling the photochemical attenuation pathways of the fibrate drug gemfibrozil in surface waters. CHEMOSPHERE 2017; 170:124-133. [PMID: 27987461 DOI: 10.1016/j.chemosphere.2016.11.135] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 11/25/2016] [Accepted: 11/26/2016] [Indexed: 05/27/2023]
Abstract
Gemfibrozil (GFZ) is a relatively persistent pollutant in surface-water environments and it is rather recalcitrant to biological degradation. The GFZ photochemical lifetimes are relatively short in shallow waters with low levels of dissolved organic carbon (DOC), but they can reach the month-year range in deep and high-DOC waters. The main reason is that GFZ undergoes negligible reaction with singlet oxygen or degradation sensitised by the triplet states of chromophoric dissolved organic matter, which are the usually prevalent photochemical pathways in deep and high-DOC sunlit waters. Nitrate and nitrite scarcely affect the overall GFZ lifetimes, but they can shift photodegradation from direct photolysis to the OH process. These two pathways are the main GFZ phototransformation routes, with the direct photolysis prevailing in shallow environments during summer. Under these conditions the GFZ photochemical lifetimes are also shorter and the environmental significance of photodegradation correspondingly higher. The direct photolysis of GFZ under UVB irradiation yielded several transformation intermediates deriving from oxidation or cleavage of the aliphatic lateral chain. A quinone derivative (2,5-dimethyl-1,4-benzoquinone), a likely oxidation product of the transformation intermediate 2,5-dimethylphenol, is expected to be the most acutely and chronically toxic compound arising from GFZ direct photolysis. Interestingly, literature evidence suggests that the same toxic intermediate would be formed upon OH reaction.
Collapse
Affiliation(s)
- Debora Fabbri
- Università degli Studi di Torino, Dipartimento di Chimica, Via P. Giuria 5, 10125 Torino, Italy
| | - Valter Maurino
- Università degli Studi di Torino, Dipartimento di Chimica, Via P. Giuria 5, 10125 Torino, Italy
| | - Marco Minella
- Università degli Studi di Torino, Dipartimento di Chimica, Via P. Giuria 5, 10125 Torino, Italy
| | - Claudio Minero
- Università degli Studi di Torino, Dipartimento di Chimica, Via P. Giuria 5, 10125 Torino, Italy
| | - Davide Vione
- Università degli Studi di Torino, Dipartimento di Chimica, Via P. Giuria 5, 10125 Torino, Italy; Università degli Studi di Torino, Centro Interdipartimentale NatRisk, Via L. Da Vinci 44, 10095 Grugliasco (TO), Italy.
| |
Collapse
|
634
|
Moreno-Andrés J, Romero-Martínez L, Acevedo-Merino A, Nebot E. UV-based technologies for marine water disinfection and the application to ballast water: Does salinity interfere with disinfection processes? THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 581-582:144-152. [PMID: 28011021 DOI: 10.1016/j.scitotenv.2016.12.077] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 12/12/2016] [Accepted: 12/12/2016] [Indexed: 06/06/2023]
Abstract
Water contained on ships is employed in the majority of activities on a vessel; therefore, it is necessary to correctly manage through marine water treatments. Among the main water streams generated on vessels, ballast water appears to be an emerging global challenge (especially on cargo ships) due to the transport of invasive species and the significant impact that the ballast water discharge could have on ecosystems and human activities. To avoid this problem, ballast water treatment must be implemented prior to water discharge in accordance with the upcoming Ballast Water Management Convention. Different UV-based treatments (photolytic: UV-C and UV/H2O2, photocatalytic: UV/TiO2), have been compared for seawater disinfection. E. faecalis is proposed as a biodosimeter organism for UV-based treatments and demonstrates good properties for being considered as a Standard Test Organism for seawater. Inactivation rates by means of the UV-based treatments were obtained using a flow-through UV-reactor. Based on the two variables responses that were studied (kinetic rate constant and UV-Dose reductions), both advanced oxidation processes (UV/H2O2 and photocatalysis) were more effective than UV-C treatment. Evaluation of salinity on the processes suggests different responses according to the treatments: major interference on photocatalysis treatment and minimal impact on UV/H2O2.
Collapse
Affiliation(s)
- Javier Moreno-Andrés
- Department of Environmental Technologies, Faculty of Marine and Environmental Sciences, CACYTMAR, University of Cádiz, Campus Universitario Puerto Real, Avda. República Saharaui s/n, 11510, Puerto Real, Cádiz, Spain.
| | - Leonardo Romero-Martínez
- Department of Environmental Technologies, Faculty of Marine and Environmental Sciences, CACYTMAR, University of Cádiz, Campus Universitario Puerto Real, Avda. República Saharaui s/n, 11510, Puerto Real, Cádiz, Spain
| | - Asunción Acevedo-Merino
- Department of Environmental Technologies, Faculty of Marine and Environmental Sciences, CACYTMAR, University of Cádiz, Campus Universitario Puerto Real, Avda. República Saharaui s/n, 11510, Puerto Real, Cádiz, Spain
| | - Enrique Nebot
- Department of Environmental Technologies, Faculty of Marine and Environmental Sciences, CACYTMAR, University of Cádiz, Campus Universitario Puerto Real, Avda. República Saharaui s/n, 11510, Puerto Real, Cádiz, Spain
| |
Collapse
|
635
|
Chan KL, Wang S, Liu C, Zhou B, Wenig MO, Saiz-Lopez A. On the summertime air quality and related photochemical processes in the megacity Shanghai, China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 580:974-983. [PMID: 27986317 DOI: 10.1016/j.scitotenv.2016.12.052] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 12/08/2016] [Accepted: 12/08/2016] [Indexed: 06/06/2023]
Abstract
Summertime surface ozone (O3) and related secondary formation of fine particles are the major air quality concerns in the megacity of Shanghai. We performed mobile Cavity Enhanced Differential Optical Absorption Spectroscopy (CE-DOAS) measurements to investigate the spatial distribution of on-road nitrogen dioxide (NO2) concentrations along the Inner Ring Elevated Road (IRER) in Shanghai. The observations show a ratio of 4 between CE-DOAS averaged on-road NO2 and the in-situ ambient measurements, illustrating the strong impact of vehicle emissions over the urban area. The air mass transport analysis suggests that the observed episodic ozone events arise from both the abundance of volatile organic compounds (VOCs) precursors in the sampled plume and the regional transport of ozone-rich air masses. Analysis of the sources of PM2.5 shows that the secondary heterogeneous gas-to-particle conversion of sulfate and nitrate from sulfur dioxide (SO2) and nitrogen oxides (NOx) is the largest source of PM2.5 contributing 44.8±9.2% of the total PM2.5. Ozone-related photochemical formation of fine particles is estimated to contribute about 22.5±11.9% of the total PM2.5, which is strongly facilitated by solar radiation in summer. According to our results, nitrous acid (HONO) is the major precursor of hydroxyl radicals (OH) accounting for 40% to 80% of the total OH production during daytime. A significant correlation is found between the HONO levels in the early morning and the daily O3 and PM2.5 levels. The summertime measurements indicate that the photolytic reaction of HONO after sunrise increased the abundance of daytime OH and oxidative capacity, resulting in an enhancement of ground level ozone and secondary organic aerosol formation. This study provides quantitative information to better understand photochemical formation of ozone and fine particles in Shanghai during summertime, which is useful for designing collaborative strategies to mitigate emissions of precursor pollutants.
Collapse
Affiliation(s)
- Ka Lok Chan
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China; Meteorological Institute, Ludwig-Maximilians-Universität München, Munich 80333, Germany
| | - Shanshan Wang
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid 28006, Spain; Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
| | - Cheng Liu
- School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China; Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
| | - Bin Zhou
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
| | - Mark O Wenig
- Meteorological Institute, Ludwig-Maximilians-Universität München, Munich 80333, Germany
| | - Alfonso Saiz-Lopez
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP(3)), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid 28006, Spain
| |
Collapse
|
636
|
Li Y, Pan Y, Lian L, Yan S, Song W, Yang X. Photosensitized degradation of acetaminophen in natural organic matter solutions: The role of triplet states and oxygen. WATER RESEARCH 2017; 109:266-273. [PMID: 27914257 DOI: 10.1016/j.watres.2016.11.049] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 11/11/2016] [Accepted: 11/20/2016] [Indexed: 06/06/2023]
Abstract
The photolysis of acetaminophen, a widely used pharmaceutical, in simulated natural organic matter solutions was investigated. The triplet states of natural organic matter (3NOM*) were found to play the dominant role in its photodegradation, while the contributions from hydroxyl radicals and singlet oxygen were negligible. Dissolved oxygen (DO) plays a dual role. From anaerobic to microaerobic (0.5 mg/L DO) conditions, the degradation rate of acetaminophen increased by 4-fold. That suggests the involvement of DO in reactions with the degradation intermediates. With increasing oxygen levels to saturated conditions (26 mg/L DO), the degradation rate became slower, mainly due to DO's quenching effect on 3NOM*. Superoxide radical (O2-) did not react with acetaminophen directly, but possibly quenched the intermediates to reverse the degradation process. The main photochemical pathways were shown to involve phenoxyl radical and N-radical cations, finally yielding hydroxylated derivatives, dimers and nitrosophenol. A reaction mechanism involving 3NOM*, oxygen and O2- is proposed.
Collapse
Affiliation(s)
- Yanyun Li
- School of Environmental Science and Engineering, Key Laboratory of Aquatic Product Safety of Ministry of Education, Sun Yat-sen University, Guangzhou 510275, China
| | - Yanheng Pan
- School of Environmental Science and Engineering, Key Laboratory of Aquatic Product Safety of Ministry of Education, Sun Yat-sen University, Guangzhou 510275, China
| | - Lushi Lian
- Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China
| | - Shuwen Yan
- Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China
| | - Weihua Song
- Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China.
| | - Xin Yang
- School of Environmental Science and Engineering, Key Laboratory of Aquatic Product Safety of Ministry of Education, Sun Yat-sen University, Guangzhou 510275, China.
| |
Collapse
|
637
|
Luo C, Wang H, Dong W, Zhang X. Theoretical investigation on the mechanism of the OH-initiated degradation process of reactive red 2 azo dye. RSC Adv 2017. [DOI: 10.1039/c7ra05727j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The dual descriptor (Δf) data of azo form (a, RR2) and hydrazone form (b, HRR2) of RR2 dianion. For Δf> 0 (green), the site is favorable for nucleophilic attack, for Δf< 0 (blue), the site is favorable for electrophilic attack. Key bond lengths in Å.
Collapse
Affiliation(s)
- Cheng Luo
- Harbin Institute of Technology Shenzhen Graduate School
- Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control
- Shenzhen 518055
- China
| | - Hongjie Wang
- Harbin Institute of Technology Shenzhen Graduate School
- Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control
- Shenzhen 518055
- China
| | - Wenyi Dong
- Harbin Institute of Technology Shenzhen Graduate School
- Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control
- Shenzhen 518055
- China
| | - Xianbing Zhang
- Harbin Institute of Technology Shenzhen Graduate School
- Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control
- Shenzhen 518055
- China
- Chongqing Jiaotong University
| |
Collapse
|
638
|
Subramanian G, Madras G. Remarkable enhancement of Fenton degradation at a wide pH range promoted by thioglycolic acid. Chem Commun (Camb) 2017; 53:1136-1139. [DOI: 10.1039/c6cc09962a] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Thioglycolic acid efficiently recycles Fe(ii) and significantly enhances the Fenton degradation of organic and microbial pollutants at a broad pH range.
Collapse
Affiliation(s)
| | - Giridhar Madras
- Dept. of Chemical Engineering
- Indian Institute of Science
- Bangalore 560012
- India
| |
Collapse
|
639
|
Effect of organic co-solvents in the evaluation of the hydroxyl radical scavenging activity by the 2-deoxyribose degradation assay: The paradigmatic case of α-lipoic acid. Biophys Chem 2017; 220:1-6. [DOI: 10.1016/j.bpc.2016.10.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 10/26/2016] [Accepted: 10/26/2016] [Indexed: 11/18/2022]
|
640
|
Abstract
We theoretically investigate the rate constantk(T,p) of the OH + SO2reaction with experimental accuracy.
Collapse
Affiliation(s)
- Bo Long
- College of Material Science and Engineering
- Guizhou Minzu University
- Guiyang
- China
- Department of Chemistry
| | - Junwei Lucas Bao
- Department of Chemistry
- Chemical Theory Center, and Supercomputing Institute
- University of Minnesota
- Minneapolis
- USA
| | - Donald G. Truhlar
- Department of Chemistry
- Chemical Theory Center, and Supercomputing Institute
- University of Minnesota
- Minneapolis
- USA
| |
Collapse
|
641
|
Moore PW, Hooker JP, Zavras A, Khairallah GN, Krenske EH, Bernhardt PV, Quach G, Moore EG, O'Hair RAJ, Williams CM. Hydroxyl Radicals via Collision-Induced Dissociation of Trimethylammonium Benzyl Alcohols. Aust J Chem 2017. [DOI: 10.1071/ch16602] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The hydroxyl radical is a well known reactive oxygen species important for interstellar, atmospheric, and combustion chemistry in addition to multiple biochemical processes. Although there are many methods to generate the hydroxyl radical, most of these are inorganic based, with only a few originating from organic precursor molecules. Reported herein is the observation that trimethylammonium benzyl alcohols and their corresponding deuterated isotopologues act as a good source of hydroxyl and deuteroxyl radicals in the gas-phase under collision-induced dissociation (CID) conditions. Attempts to replicate this chemistry in the condensed phase are described.
Collapse
|
642
|
Lau SS, Abraham SM, Roberts AL. Chlorination Revisited: Does Cl - Serve as a Catalyst in the Chlorination of Phenols? ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:13291-13298. [PMID: 27993072 DOI: 10.1021/acs.est.6b03539] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The aqueous chlorination of (chloro)phenols is one of the best-studied reactions in the environmental literature. Previous researchers have attributed these reactions to two chlorine species: HOCl (at circum-neutral and high pH) and H2OCl+ (at low pH). In this study, we seek to examine the roles that two largely overlooked chlorine species, Cl2 and Cl2O, may play in the chlorination of (chloro)phenols. Solution pH, chloride concentration, and chlorine dose were systematically varied in order to assess the importance of different chlorine species as chlorinating agents. Our findings indicate that chlorination rates at pH < 6 increase substantially when chloride is present, attributed to the formation of Cl2. At pH 6.0 and a chlorine dose representative of drinking water treatment, Cl2O is predicted to have at best a minor impact on chlorination reactions, whereas Cl2 may contribute more than 80% to the overall chlorination rate depending on the (chloro)phenol identity and chloride concentration. While it is not possible to preclude H2OCl+ as a chlorinating agent, we were able to model our low-pH data by considering Cl2 only. Even traces of chloride can generate sufficient Cl2 to influence chlorination kinetics, highlighting the role of chloride as a catalyst in chlorination reactions.
Collapse
Affiliation(s)
- Stephanie S Lau
- Department of Environmental Health and Engineering, Johns Hopkins University , 313 Ames Hall, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Sonali M Abraham
- Department of Environmental Health and Engineering, Johns Hopkins University , 313 Ames Hall, 3400 North Charles Street, Baltimore, Maryland 21218, United States
- Institute of the Environment and Sustainability, University of California, Los Angeles , La Kretz Hall, 619 Charles E. Young Drive East #300, Los Angeles, California 90024, United States
| | - A Lynn Roberts
- Department of Environmental Health and Engineering, Johns Hopkins University , 313 Ames Hall, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| |
Collapse
|
643
|
Reed Harris AE, Doussin JF, Carpenter BK, Vaida V. Gas-Phase Photolysis of Pyruvic Acid: The Effect of Pressure on Reaction Rates and Products. J Phys Chem A 2016; 120:10123-10133. [DOI: 10.1021/acs.jpca.6b09058] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Allison E. Reed Harris
- Department
of Chemistry and Biochemistry, CIRES, University of Colorado, Boulder, Colorado 80309, United States
| | - Jean-Francois Doussin
- LISA,
UMR-CNRS 7583, Université Paris Est Créteil (UPEC),
Université Paris Diderot (UPD), Institut Pierre Simon Laplace (IPSL), 94010 Créteil, France
| | | | - Veronica Vaida
- Department
of Chemistry and Biochemistry, CIRES, University of Colorado, Boulder, Colorado 80309, United States
| |
Collapse
|
644
|
de Melo da Silva L, Pereira Cavalcante R, Fabbro Cunha R, Gozzi F, Falcao Dantas R, de Oliveira SC, Machulek A. Tolfenamic acid degradation by direct photolysis and the UV-ABC/H 2O 2 process: factorial design, kinetics, identification of intermediates, and toxicity evaluation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 573:518-531. [PMID: 27575359 DOI: 10.1016/j.scitotenv.2016.08.139] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Revised: 08/03/2016] [Accepted: 08/19/2016] [Indexed: 06/06/2023]
Abstract
This study employed direct UV-ABC photolysis and the UV-ABC/H2O2 process to investigate the degradation of tolfenamic acid (TA), a common anti-inflammatory drug used in both human and veterinary medicine. A 23 factorial design with added center point was used to evaluate the effect of three independent variables-namely, H2O2 concentration ([H2O2]), TA concentration ([TA]), and experiment time (time)-on TA degradation and H2O2 photolysis during UV-ABC/H2O2 treatment using a high-pressure mercury vapor lamp (photon flux of 2.6307 × 104 J s-1) as the UV irradiation source. The responses yielded similar values, revealing a linear behavior, with correlation coefficients R = 0.9968 and Radj = 0.9921 for TA degradation and R = 0.9828 and Radj = 0.9570 for H2O2 photolysis. The most efficient combination of variables was [H2O2] = 255 mg L-1 and [TA] = 25 mg L-1, resulting in 100% TA degradation and 98.87% H2O2 photolysis by 90 min of treatment. Additionally, the second-order kinetic constant of the reaction between TA and HO● was determined using a competitive kinetic model, employing 2,4-dichlorophenoxyacetic acid (2,4D) as the reference compound. The kinetic constant was 1.9 × 1010 M-1 s-1 in alkaline medium. TA degradation by direct photolysis generated quinone imines as by-products, responsible for the formation of a dark red "internal filter" that increased the value of acute toxicity to Artemia salina. The UV-ABC/H2O2 process did not promote formation of quinone imines by 90 min of treatment and therefore did not increase acute toxicity values. Several by-products generated during TA degradation were identified and possible degradation pathways for the UV-ABC and UV-ABC/H2O2 processes were proposed.
Collapse
Affiliation(s)
- Lucas de Melo da Silva
- Institute of Chemistry, Federal University of Mato Grosso do Sul; Av. Senador Filinto Muller, 1555; CP 549; Campo Grande, MS 79074-460, Brazil
| | - Rodrigo Pereira Cavalcante
- Institute of Chemistry, Federal University of Mato Grosso do Sul; Av. Senador Filinto Muller, 1555; CP 549; Campo Grande, MS 79074-460, Brazil
| | - Rebeca Fabbro Cunha
- Institute of Chemistry, Federal University of Mato Grosso do Sul; Av. Senador Filinto Muller, 1555; CP 549; Campo Grande, MS 79074-460, Brazil
| | - Fábio Gozzi
- Institute of Chemistry, Federal University of Mato Grosso do Sul; Av. Senador Filinto Muller, 1555; CP 549; Campo Grande, MS 79074-460, Brazil
| | - Renato Falcao Dantas
- School of Technology, University of Campinas; Rua Paschoal Marmo, 1888; Limeira, SP 13484-332, Brazil
| | - Silvio Cesar de Oliveira
- Institute of Chemistry, Federal University of Mato Grosso do Sul; Av. Senador Filinto Muller, 1555; CP 549; Campo Grande, MS 79074-460, Brazil
| | - Amilcar Machulek
- Institute of Chemistry, Federal University of Mato Grosso do Sul; Av. Senador Filinto Muller, 1555; CP 549; Campo Grande, MS 79074-460, Brazil.
| |
Collapse
|
645
|
Gong Y, Yang C, Ji H, Chen C, Ma W, Zhao J. Mechanistic Studies of TiO2Photocatalysis and Fenton Degradation of Hydrophobic Aromatic Pollutants in Water. Chem Asian J 2016; 11:3568-3574. [DOI: 10.1002/asia.201601299] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Indexed: 01/03/2023]
Affiliation(s)
- Yuanzheng Gong
- Key Laboratory of Photochemistry; National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Chun Yang
- Key Laboratory of Photochemistry; National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Hongwei Ji
- Key Laboratory of Photochemistry; National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Chuncheng Chen
- Key Laboratory of Photochemistry; National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Wanhong Ma
- Key Laboratory of Photochemistry; National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| | - Jincai Zhao
- Key Laboratory of Photochemistry; National Laboratory for Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
- University of Chinese Academy of Sciences; Beijing 100049 P.R. China
| |
Collapse
|
646
|
Subramanian G, Madras G. Introducing saccharic acid as an efficient iron chelate to enhance photo-Fenton degradation of organic contaminants. WATER RESEARCH 2016; 104:168-177. [PMID: 27522633 DOI: 10.1016/j.watres.2016.07.070] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 07/26/2016] [Accepted: 07/28/2016] [Indexed: 06/06/2023]
Abstract
The identification of iron chelates that can enhance photo-Fenton degradation is of great interest in the field of advanced oxidation process. Saccharic acid (SA) is a polyhydroxy carboxylic acid and completely non-toxic. Importantly, it can effectively bind Fe(III) as well as induce photoreduction of Fe(III). Despite having these interesting properties, the effect of SA on photo-Fenton degradation has not been studied. Herein, we demonstrate the first assessment of SA as an iron chelate in photo-Fenton process using methylene blue (MB) as a model organic contaminant. Our results demonstrate that SA has the ability to (i) enhance the photo-Fenton degradation of MB by about 11 times at pH 4.5 (ii) intensify photochemical reduction of Fe(III) to Fe(II) by about 17 times and (iii) accelerate the rate of consumption of H2O2 in photo-Fenton process by about 5 times (iv) increase the TOC reduction by about 2 times and (v) improve the photo-Fenton degradation of MB in the presence of a variety of common inorganic ions and organic matter. The influential properties of SA on photo-Fenton degradation is attributed to the efficient photochemical reduction of Fe(III) via LMCT (ligand to metal charge transfer reaction) to Fe(II), which then activated H2O2 to generate OH and accelerated photo-Fenton degradation efficiency. Moreover, the effect of operational parameters such as oxidant: contaminant (H2O2: MB) ratio, catalyst: contaminant (Fe(III)SA: MB) ratio, Fe(III): SA stoichiometry and pH on the degradation of MB by photo-Fenton in the presence of SA is demonstrated. Importantly, SA assisted photo-Fenton caused effective degradation of MB and 4-Chlorophenol under natural sunlight irradiation in natural water matrix. The findings strongly support SA as a deserving iron chelate to enhance photo-Fenton degradation.
Collapse
Affiliation(s)
| | - Giridhar Madras
- Dept. of Chemical Engineering, Indian Institute of Science, Bangalore 560012, India
| |
Collapse
|
647
|
Minella M, Maurino V, Minero C, Vione D. A model assessment of the ability of lake water in Terra Nova Bay, Antarctica, to induce the photochemical degradation of emerging contaminants. CHEMOSPHERE 2016; 162:91-98. [PMID: 27487093 DOI: 10.1016/j.chemosphere.2016.07.049] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 07/06/2016] [Accepted: 07/15/2016] [Indexed: 06/06/2023]
Abstract
The shallow lakes located in Terra Nova Bay, Antarctica, are free from ice for only up to a couple of months (mid December to early/mid February) during the austral summer. In the rest of the year, the ice cover shields the light and inhibits the photochemical processes in the water columns. Previous work has shown that chromophoric dissolved organic matter (CDOM) in these lakes is very reactive photochemically. A model assessment is here provided of lake-water photoreactivity in field conditions, based on experimental data of lake water absorption spectra, chemistry and photochemistry obtained previously, taking into account the water depth and the irradiation conditions of the Antarctic summer. The chosen sample contaminants were the solar filter benzophenone-3 and the antimicrobial agent triclosan, which have very well known photoreactivity and have been found in a variety of environmental matrices in the Antarctic continent. The two compounds would have a half-life time of just a few days or less in the lake water during the Antarctic summertime, largely due to reaction with CDOM triplet states ((3)CDOM*). In general, pollutants that occur in the ice and could be released to lake water upon ice melting (around or soon after the December solstice) would be quickly photodegraded if they undergo fast reaction with (3)CDOM*. With some compounds, the important (3)CDOM* reactions might favour the production of harmful secondary pollutants, such as 2,8-dichlorodibenzodioxin from the basic (anionic) form of triclosan.
Collapse
Affiliation(s)
- Marco Minella
- Università degli Studi di Torino, Dipartimento di Chimica, Via P. Giuria 5, 10125 Torino, Italy
| | - Valter Maurino
- Università degli Studi di Torino, Dipartimento di Chimica, Via P. Giuria 5, 10125 Torino, Italy
| | - Claudio Minero
- Università degli Studi di Torino, Dipartimento di Chimica, Via P. Giuria 5, 10125 Torino, Italy
| | - Davide Vione
- Università degli Studi di Torino, Dipartimento di Chimica, Via P. Giuria 5, 10125 Torino, Italy; Università degli Studi di Torino, Centro Interdipartimentale NatRisk, Via L. Da Vinci 44, 10095 Grugliasco, TO, Italy.
| |
Collapse
|
648
|
Sorathiya K, Mishra B, Kalarikkal A, Reddy KP, Gopinath CS, Khushalani D. Enhancement in Rate of Photocatalysis Upon Catalyst Recycling. Sci Rep 2016; 6:35075. [PMID: 27731347 PMCID: PMC5059627 DOI: 10.1038/srep35075] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 09/23/2016] [Indexed: 11/09/2022] Open
Abstract
Recyclability is an important aspect for heterogeneous photo-catalysts. Ease of recovery and stability of the photo-catalyst in terms of efficiency over the number of cycles are highly desired and in fact it is ideal if the efficiency is constant and it should not decrease marginally with each cycle. Presented here is a seminal observation in which the photocatalytic activity is shown to improve with increasing number of catalytic cycles (it is 1.7 times better after the 1st cycle and 3.1 times better after the 2nd cycle). Specifically, nanorods of pure TiO2 and TiO2 doped with controlled amount of tungsten have been used to degrade two model pollutants: Phenol and Rhodamine B under exclusive visible light illumination. It was found that, in case of 1 mol.% W incorporation, rate of photocatalysis and also the range of visible light absorption of the photocatalyst increased after the photocatalysis as
compared to before photocatalysis. This aspect is unique for doped TiO2 and hence provides an intriguing way to mitigate low photoactivity.
Collapse
Affiliation(s)
- Kalpesh Sorathiya
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Rd, Colaba, Mumbai, 400005 India
| | - Biswajit Mishra
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Rd, Colaba, Mumbai, 400005 India
| | - Abhishek Kalarikkal
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Rd, Colaba, Mumbai, 400005 India
| | - Kasala Prabhakar Reddy
- Catalysis Division and Center of Excellence on Surface Science, CSIR-National Chemical Laboratory, Pune, 411008 India
| | - Chinnakonda S Gopinath
- Catalysis Division and Center of Excellence on Surface Science, CSIR-National Chemical Laboratory, Pune, 411008 India
| | - Deepa Khushalani
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Rd, Colaba, Mumbai, 400005 India
| |
Collapse
|
649
|
Ma J, Zhang K, Huang M, Hector SB, Liu B, Tong C, Liu Q, Zeng J, Gao Y, Xu T, Liu Y, Liu X, Zhu Y. Involvement of Fenton chemistry in rice straw degradation by the lignocellulolytic bacterium Pantoea ananatis Sd-1. BIOTECHNOLOGY FOR BIOFUELS 2016; 9:211. [PMID: 27761153 PMCID: PMC5054592 DOI: 10.1186/s13068-016-0623-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 09/24/2016] [Indexed: 05/24/2023]
Abstract
BACKGROUND Lignocellulolytic bacteria have revealed to be a promising source for biofuel production, yet the underlying mechanisms are still worth exploring. Our previous study inferred that the highly efficient lignocellulose degradation by bacterium Pantoea ananatis Sd-1 might involve Fenton chemistry (Fe2+ + H2O2 + H+ → Fe3+ + OH· + H2O), similar to that of white-rot and brown-rot fungi. The aim of this work is to investigate the existence of this Fenton-based oxidation mechanism in the rice straw degradation process of P. ananatis Sd-1. RESULTS After 3 days incubation of unpretreated rice straw with P. ananatis Sd-1, the percentage in weight reduction of rice straw as well as its cellulose, hemicellulose, and lignin components reached 46.7, 43.1, 42.9, and 37.9 %, respectively. The addition of different hydroxyl radical scavengers resulted in a significant decline (P < 0.001) in rice straw degradation. Pyrolysis gas chromatography-mass spectrometry and Fourier transform infrared spectroscopy analysis revealed the consistency of chemical changes of rice straw components that exists between P. ananatis Sd-1 and Fenton reagent treatment. In addition to the increased total iron ion concentration throughout the rice straw decomposition process, the Fe3+-reducing capacity of P. ananatis Sd-1 was induced by rice straw and predominantly contributed by aromatic compounds metabolites. The transcript levels of the glucose-methanol-choline oxidoreductase gene related to hydrogen peroxide production were significantly up-regulated (at least P < 0.01) in rice straw cultures. Higher activities of GMC oxidoreductase and less hydrogen peroxide concentration in rice straw cultures relative to glucose cultures may be responsible for increasing rice straw degradation, which includes Fenton-like reactions. CONCLUSIONS Our results confirmed the Fenton chemistry-assisted degradation model in P. ananatis Sd-1. We are among the first to show that a Fenton-based oxidation mechanism exists in a bacteria degradation system, which provides a new perspective for how natural plant biomass is decomposed by bacteria. This degradative system may offer an alternative approach to the fungi system for lignocellulosic biofuels production.
Collapse
Affiliation(s)
- Jiangshan Ma
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410008 Hunan People’s Republic of China
| | - Keke Zhang
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410008 Hunan People’s Republic of China
| | - Mei Huang
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410008 Hunan People’s Republic of China
| | - Stanton B. Hector
- Department of Genetics, Institute for Plant Biotechnology, Stellenbosch University, Private Bag X1, Matieland, 7602 South Africa
- DNA Sequencing Unit, Central Analytical Facility, Stellenbosch University, Private Bag X1, Matieland, 7602 South Africa
| | - Bin Liu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410008 Hunan People’s Republic of China
| | - Chunyi Tong
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410008 Hunan People’s Republic of China
| | - Qian Liu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410008 Hunan People’s Republic of China
| | - Jiarui Zeng
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410008 Hunan People’s Republic of China
| | - Yan Gao
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410008 Hunan People’s Republic of China
| | - Ting Xu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410008 Hunan People’s Republic of China
| | - Ying Liu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410008 Hunan People’s Republic of China
| | - Xuanming Liu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410008 Hunan People’s Republic of China
| | - Yonghua Zhu
- Hunan Province Key Laboratory of Plant Functional Genomics and Developmental Regulation, College of Biology, Hunan University, Changsha, 410008 Hunan People’s Republic of China
| |
Collapse
|
650
|
Jiang LX, Li XN, Li HF, Zhou ZX, He SG. Generation of Hydroxyl Radicals in the Reaction of Dihydrogen with AuNbO 4+ Cluster Cations. Chem Asian J 2016; 11:2730-2734. [PMID: 27017581 DOI: 10.1002/asia.201600144] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 03/09/2016] [Indexed: 11/05/2022]
Abstract
A molecular-level insight into the nature of reactive oxygen species involved in dihydrogen (H2 ) dissociation is of great importance to understand gold catalysis. In this study, laser ablation generated and mass-selected AuNbO4+ oxide cluster cations could dissociate H2 in an ion-trap reactor. The reaction has been characterized by time-of-flight mass spectrometric experiments and density functional calculations. The lowest energy isomer of AuNbO4+ contains two lattice oxygen (O2- ) and one superoxide (O2.- ) species. The gold atom anchors the H2 molecule in the first step and then delivers one hydrogen atom to the O2- ion in H2 dissociation. At the same time, O2.- is reduced into a peroxide unit that can accept the second hydrogen atom of H2 with the generation of a hydroxyl radical as the main product. In this study, the important roles of the O2.- unit in the dissociation of H2 have been identified.
Collapse
Affiliation(s)
- Li-Xue Jiang
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of, Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P.R. China
| | - Xiao-Na Li
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of, Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China.
| | - Hai-Fang Li
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of, Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P.R. China
| | - Zhen-Xun Zhou
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P.R. China
| | - Sheng-Gui He
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of, Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China.
| |
Collapse
|