551
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Law JCF, Leung KSY. Redox mediators and irradiation improve fenton degradation of acesulfame. CHEMOSPHERE 2019; 217:374-382. [PMID: 30419391 DOI: 10.1016/j.chemosphere.2018.11.032] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 11/02/2018] [Accepted: 11/03/2018] [Indexed: 06/09/2023]
Abstract
Widely recognized as a promising approach to degrading recalcitrant pollutants, Advanced Oxidation Processes (AOPs) have drawn much attention for their effectiveness and efficiency. Among all the AOPs, the Fenton system has been widely applied for oxidation and mineralization of micropollutants due to its ease of implementation and high catalytic efficiency. However, the necessity of preceding acidification, together with rapid consumption and slow regeneration of Fe(II) resulting in deterioration of reactivity, has reduced its competitiveness as a practical option for water treatment. Acknowledging the above drawbacks, this study investigates the potential viable option to enhance the Fenton system. Acesulfame was chosen as the model compound due to its ubiquitous occurrence and persistence in the environment. UV-assisted photo-Fenton treatment was found to remove the parent compound effectively; the transformation profile of acesulfame was identified and elucidated with the ultra-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry. Prolonged UV photo-Fenton treatment was effective for mineralization of the majority of the transformation products, without increasing the overall toxicity as indicated by Vibrio fischeri bioluminescence assay. The positive effects of the addition of redox mediators to Fenton systems at neutral pH were confirmed in this study. The results could be the basis for further development of homogeneous catalytic degradation techniques for the oxidation of environmental contaminants at circumneutral pHs to neutral pHs.
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Affiliation(s)
- Japhet Cheuk-Fung Law
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong Special Administrative Region
| | - Kelvin Sze-Yin Leung
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong Special Administrative Region; HKBU Institute of Research and Continuing Education, Shenzhen Virtual University Park, Shenzhen, China; School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, 510632, China.
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552
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Xu L, Li W, Désesquelles P, Van-Oanh NT, Thomas S, Yang J. A Statistical Model and DFT Study of the Fragmentation Mechanisms of Metronidazole by Advanced Oxidation Processes. J Phys Chem A 2019; 123:933-942. [DOI: 10.1021/acs.jpca.8b10554] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Lejin Xu
- Department of Nuclear Engineering and Technology, School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan 430074, People’s Republic of China
| | - Wuyang Li
- Department of Nuclear Engineering and Technology, School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan 430074, People’s Republic of China
| | - Pierre Désesquelles
- Department of Nuclear Engineering and Technology, School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan 430074, People’s Republic of China
- Centre des Sciences Nucléaires et des Sciences de la Matière (CSNSM), Université Paris-Sud and CNRS-IN2P3, Université Paris-Saclay, Bâtiment 104, 15 rue Clemenceau, F91405 Orsay Cédex, France
| | - Nguyen-Thi Van-Oanh
- Laboratoire de Chimie Physique (LCP), CNRS UMR 8000, Université Paris-Sud, Université Paris-Saclay, F91405 Orsay Cédex, France
| | - Sébastien Thomas
- Centre des Sciences Nucléaires et des Sciences de la Matière (CSNSM), Université Paris-Sud and CNRS-IN2P3, Université Paris-Saclay, Bâtiment 104, 15 rue Clemenceau, F91405 Orsay Cédex, France
- Laboratoire de Chimie Physique (LCP), CNRS UMR 8000, Université Paris-Sud, Université Paris-Saclay, F91405 Orsay Cédex, France
| | - Jun Yang
- Department of Nuclear Engineering and Technology, School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan 430074, People’s Republic of China
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553
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Zhang J, An J, Qu Y, Liu X, Chen Y. Impacts of potential HONO sources on the concentrations of oxidants and secondary organic aerosols in the Beijing-Tianjin-Hebei region of China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 647:836-852. [PMID: 30096673 DOI: 10.1016/j.scitotenv.2018.08.030] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2018] [Revised: 08/02/2018] [Accepted: 08/03/2018] [Indexed: 06/08/2023]
Abstract
We first coupled indoor emissions and biomass burning emissions into the WRF-Chem model besides the other four potential HONO sources (i.e., traffic emissions, soil emissions, and heterogeneous reactions on aerosol and ground surfaces). Eight simulations were performed in the Beijing-Tianjin-Hebei region (BTH) of China in August of 2006. The results indicated that traffic emissions and heterogeneous reactions on ground and aerosol surfaces were the key sources of HONO at night, accounting for ~41%, ~27% and ~20% of the nighttime simulated HONO concentrations, respectively. The two heterogeneous reactions were the main contributors during the day, accounting for ~66% (ground surfaces) and ~19% (aerosol surfaces) of the daytime simulated HONO concentrations. The indoor emission source could be the second largest contributor during nighttime and led to a maximum hourly enhancement of 0.59 and 0.76 ppb at the central urban sites of Beijing and Tianjin, respectively. The six potential HONO sources enhanced the monthly meridional-mean concentrations of O3, OH and HO2 by 5-44%, 5~>150% and 5~>200%, respectively, leading to an enhancement of 1-3 μg m-3 in the monthly averaged concentrations of secondary organic aerosol (SOA), and that of 10-35 μg m-3 in the largest hourly concentrations of SOA within 1000 m above the ground in the BTH. The major precursors of the enhanced SOA were Xylenes, Toluene and BIGALK (lumped alkanes C > 3). The inclusion of the six potential HONO sources in the WRF-Chem model considerably improved the HONO simulations at both urban and suburban sites compared with the corresponding observations. The above results suggested that the six potential HONO sources significantly enhanced the atmospheric oxidation capacity and thus accelerated SOA chemical aging in the BTH of China, leading to large enhancements in the hourly SOA concentrations and aggravating haze events in this region.
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Affiliation(s)
- Jingwei Zhang
- State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029, China; University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Junling An
- State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029, China; University of the Chinese Academy of Sciences, Beijing 100049, China; Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 36102, China.
| | - Yu Qu
- State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029, China
| | - Xingang Liu
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China
| | - Yong Chen
- State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, Beijing 100029, China
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554
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Pang H, Zhang Q, Wang H, Cai D, Ma Y, Li L, Li K, Lu X, Chen H, Yang X, Chen J. Photochemical Aging of Guaiacol by Fe(III)-Oxalate Complexes in Atmospheric Aqueous Phase. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:127-136. [PMID: 30484312 DOI: 10.1021/acs.est.8b04507] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Fe(III)-oxalate complexes are likely abundant in clouds, fogs and aerosol water. They are photoreactive and can act as an important source of reactive oxygen species (·OH, H2O2 and HO2·) in tropospheric aqueous phases. Although the mechanisms involved in ferrioxalate photolysis have been investigated extensively, few kinetic and mechanistic information is available on the aging of dissolved organic compounds by this photochemical system. In this work, the Fe(III)-oxalate mediated photooxidation of guaiacol (GUA), a model for phenolic compounds emitted from biomass burning, was investigated under typical pH conditions of the atmospheric water. The effect of Fe(III) concentration, oxalate concentration and pH on the photooxidation of GUA was studied in detail. Our results revealed that oxalate can inhibit the oxidation of GUA by Fe(III) under the dark condition. However, the iron-catalyzed photooxidation of GUA can be strongly promoted in the presence of oxalate due to the formation of photoactive Fe(III)-oxalate complexes. GUA was rapidly oxidized to form a number of polymeric, functionalized and open-ring products with low volatility. Detailed reaction pathways for the photooxidation of GUA by Fe(III)-oxalate complexes were proposed based on the results of high-resolution mass spectrometry. This work suggests that ferrioxalate photochemistry can play an important role in the transformation of dissolved organics in atmospheric aqueous phases.
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Affiliation(s)
- Hongwei Pang
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering , Fudan University , Shanghai 200433 , China
| | - Qi Zhang
- Department of Environmental Toxicology , University of California , Davis , California 95616 , United States
| | - Hongli Wang
- State Environmental Protection Key Laboratory of Formation and Prevention of the Urban Air Pollution Complex , Shanghai Academy of Environmental Sciences , Shanghai 200233 , China
| | - Dongmei Cai
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering , Fudan University , Shanghai 200433 , China
| | - Yingge Ma
- State Environmental Protection Key Laboratory of Formation and Prevention of the Urban Air Pollution Complex , Shanghai Academy of Environmental Sciences , Shanghai 200233 , China
| | - Li Li
- State Environmental Protection Key Laboratory of Formation and Prevention of the Urban Air Pollution Complex , Shanghai Academy of Environmental Sciences , Shanghai 200233 , China
| | - Kangning Li
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering , Fudan University , Shanghai 200433 , China
| | - Xiaohui Lu
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering , Fudan University , Shanghai 200433 , China
| | - Hong Chen
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering , Fudan University , Shanghai 200433 , China
| | - Xin Yang
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering , Fudan University , Shanghai 200433 , China
- Shanghai Institute of Pollution Control and Ecological Security , Shanghai 200092 , China
| | - Jianmin Chen
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering , Fudan University , Shanghai 200433 , China
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555
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Oxidative stability of plant hydroalcoholic extracts assessed by EPR spin trapping under forced ageing conditions: A myrtle case study. Food Chem 2019; 271:753-761. [DOI: 10.1016/j.foodchem.2018.07.156] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 07/06/2018] [Accepted: 07/24/2018] [Indexed: 11/21/2022]
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556
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Tabrizi L, Nguyen TLA, Dao DQ. Experimental and theoretical investigation of cyclometalated phenylpyridine iridium(iii) complex based on flavonol and ibuprofen ligands as potent antioxidant. RSC Adv 2019; 9:17220-17237. [PMID: 35519868 PMCID: PMC9064460 DOI: 10.1039/c9ra02726b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 05/14/2019] [Indexed: 12/13/2022] Open
Abstract
An Ir(iii) complex was synthesized using mixed ligands of biological importance, namely ibuprofen, flavonol and 2-phenylpyridine. The compound was characterized by 1H-NMR, 13C-NMR and TOF-MS spectroscopies and elemental analysis. Structures of the complex and its ligands were also calculated by density functional theory using B3LYP/Lanl2dz//6-31G(d) level of theory. Analyses of electrostatic potential, natural population, and frontier orbitals of the molecules as well as the calculation of intrinsic thermochemical properties such as bond dissociation enthalpy, ionization potential, electron affinity and proton affinity in the gas phase and in solvents (water and pentylethanoate) give the first indication that the complex is a potential antioxidant. The latter even shows better antioxidant capacity than the parent ligands. The antioxidant properties of the complex and its ligands were experimentally evaluated by studying the free radical scavenging activity towards HO˙, NO˙, DPPH˙ and ABTS˙+ radicals. Further computational work on the antioxidant processes such as the single electron transfer, the proton loss, the formal hydrogen transfer (FHT) and the radical adduct formation reactions was conducted. Results show that the FHT reaction is the mechanism responsible for the radical scavenging activity of the complex towards HO˙, HOO˙, NO˙ and DPPH˙ radicals while ABTS˙+ seems to be scavenged by an electron-donating mechanism. The FHT was further determined as a hydrogen-atom transfer but not a proton-couple electron transfer mechanism. A cyclometalated phenylpyridine iridium(iii) complex based on flavonol and ibuprofen was designed and its antioxidant activity was evaluated via experimental and theoretical studies.![]()
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Affiliation(s)
- Leila Tabrizi
- School of Chemistry
- National University of Ireland
- Galway
- Ireland
| | - Thi Le Anh Nguyen
- Institute of Research and Development
- Duy Tan University
- Danang
- Vietnam
| | - Duy Quang Dao
- Institute of Research and Development
- Duy Tan University
- Danang
- Vietnam
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557
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Radio-Protective Effects of Loliolus beka Gray Meat Consisted of a Plentiful Taurine Against Damages Caused by Gamma Ray Irradiation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1155:729-738. [DOI: 10.1007/978-981-13-8023-5_63] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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558
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Salnikov DS, Makarov SV. Kinetics and mechanism of the reaction of cyanocobalamin with potassium hydroxide in non-aqueous media. NEW J CHEM 2019. [DOI: 10.1039/c9nj01361j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The reaction of cyanocobalamin (CNCbl) with potassium hydroxide (KOH) was studied in isopropyl alcohol (iPrOH) and dimethyl sulfoxide (DMSO) under anaerobic conditions.
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Affiliation(s)
- D. S. Salnikov
- Ivanovo State University of Chemistry and Technology
- 153000 Ivanovo
- Russia
| | - S. V. Makarov
- Ivanovo State University of Chemistry and Technology
- 153000 Ivanovo
- Russia
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559
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Welsch R. Kinetic isotope effects in the water forming reaction H2/D2 + OH from rigorous close-coupling quantum dynamics simulations. Phys Chem Chem Phys 2019; 21:17054-17062. [DOI: 10.1039/c9cp02323b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rigorous quantum dynamics simulations of thermal rate constants and kinetic isotope effects for the water-forming H2/D2 + OH reaction are presented, which show increased tunneling below 300 K and can serve as benchmarks for approximate methods.
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Affiliation(s)
- Ralph Welsch
- Center for Free-Electron Laser Science
- DESY
- 22607 Hamburg
- Germany
- The Hamburg Centre for Ultrafast Imaging
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560
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Tang Y, Lu C, Sun J, Shao Y, Gao Y, Fu Z. Computational investigations on the HO 2 + CHBr 2O 2 reaction: mechanisms, products, and atmospheric implications. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:2345-2352. [PMID: 30467745 DOI: 10.1007/s11356-018-3767-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 11/14/2018] [Indexed: 06/09/2023]
Abstract
Using quantum chemistry methods, mechanisms and products of the CHBr2O2 + HO2 reaction in the atmosphere were investigated theoretically. Computational result indicates that the dominant product is CHBr2OOH + O2 formed on the triplet potential energy surface (PES). While CBr2O + OH + HO2 produced on the singlet PES is subdominant to the overall reaction under the typical atmospheric condition below 300 K. Due to higher energy barriers surmounted, other products including CBr2O2 + H2O2, CBr2O + HO3H, CH2O + HO3Br, CHBrO + HO3 + Br, and CHBr2OH + O3 make minor contributions to the overall reaction. In the presence of OH radical, CHBr2OOH generates CHBr2O2 and CBr2O2 + H2O subsequently, which enters into new Br-cycle in the atmosphere. The substitution effect of alkyl group and halogens plays negligible roles to the dominant products in the RO2 + HO2 (X = H, CH3, CH2OH, CH2F, CH2Cl, CH2Br, CH2Cl, and CH2Br) reactions in the atmosphere.
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Affiliation(s)
- Yizhen Tang
- School of Environmental and municipal engineering, Qingdao University of Technology, Fushun Road 11, Qingdao, Shandong, 266033, People's Republic of China.
| | - Chenggang Lu
- School of Environmental and municipal engineering, Qingdao University of Technology, Fushun Road 11, Qingdao, Shandong, 266033, People's Republic of China
| | - Jingyu Sun
- College of Chemistry and Environmental engineering, Hubei Normal University, Cihu Road 11, Huangshi, Hubei, 435002, People's Republic of China
| | - Youxiang Shao
- School of Materials Science and Engineering, PCFM Lab, Sun Yat-sen University, Guangzhou, 510275, People's Republic of China
| | - Ying Gao
- School of Environmental and municipal engineering, Qingdao University of Technology, Fushun Road 11, Qingdao, Shandong, 266033, People's Republic of China
| | - Zhihao Fu
- School of Environmental and municipal engineering, Qingdao University of Technology, Fushun Road 11, Qingdao, Shandong, 266033, People's Republic of China
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561
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Ren T, Qi W, Su R, He Z. Promising Techniques for Depolymerization of Lignin into Value-added Chemicals. ChemCatChem 2018. [DOI: 10.1002/cctc.201801428] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Tianyu Ren
- Chemical Engineering Research Center School of Chemical Engineering and Technology; Tianjin University; Tianjin 300072 P.R. China
| | - Wei Qi
- Chemical Engineering Research Center School of Chemical Engineering and Technology; Tianjin University; Tianjin 300072 P.R. China
- State Key Laboratory of Chemical Engineering; Tianjin University; Tianjin 300072 P.R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin); Tianjin 300072 P.R. China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology; Tianjin University; Tianjin 300072 P.R. China
| | - Rongxin Su
- Chemical Engineering Research Center School of Chemical Engineering and Technology; Tianjin University; Tianjin 300072 P.R. China
- State Key Laboratory of Chemical Engineering; Tianjin University; Tianjin 300072 P.R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin); Tianjin 300072 P.R. China
- Tianjin Key Laboratory of Membrane Science and Desalination Technology; Tianjin University; Tianjin 300072 P.R. China
| | - Zhimin He
- Chemical Engineering Research Center School of Chemical Engineering and Technology; Tianjin University; Tianjin 300072 P.R. China
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562
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Vione D, Koehler B. Modelled phototransformation kinetics of the antibiotic sulfadiazine in organic matter-rich lakes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 645:1465-1473. [PMID: 30248868 DOI: 10.1016/j.scitotenv.2018.07.206] [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: 04/25/2018] [Revised: 07/06/2018] [Accepted: 07/16/2018] [Indexed: 06/08/2023]
Abstract
Xenobiotic compounds are commonly detected in inland waters. Sunlight-induced photochemical reactions contribute to xenobiotic degradation, but the role of different photoreactions on large geographic scales remains poorly understood. Here, we used a combination of photochemical modelling and large-scale field data from 1020 lakes across Sweden to elucidate the photodegradation kinetics of the commonly used antibiotic sulfadiazine (SDZ) in organic matter-rich lakes. SDZ occurs in two forms, namely acidic HSDZ (pKa = 6.5) and basic/deprotonated SDZ-. Both species are oxidised fast by the photogenerated triplet states of natural organic matter (3NOM*). However, they also undergo efficient back reactions because the partially oxidised HSDZ (and SDZ- to a larger extent) can be reduced back to the initial compounds by the phenolic moieties contained in NOM. Typical lakes in Sweden are rich in NOM and have low pH, with the consequence that SDZ photochemistry would be dominated by HSDZ. Our simulation results showed that SDZ photodegradation kinetics in Swedish lakes would become significantly slower with increasing water depth and pH, while it depended little on latitude, which affects irradiance, or on organic matter content. As a consequence, SDZ would be particularly persistent in lakewater in some densely populated areas with relatively deep and high-pH lakes such as, most notably, the Stockholm region. Here the surface waters could be more heavily contaminated by pharmaceuticals compared to the scarcely populated regions in the centre-north of the country, where lakewater could otherwise promote an efficient photodegradation of SDZ.
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Affiliation(s)
- Davide Vione
- Department of Chemistry, University of Torino, Via Pietro Giuria 5, 10125 Torino, Italy; NatRisk Inter-Department Centre, University of Torino, Largo Paolo Braccini 2, 10095 Grugliasco (TO), Italy.
| | - Birgit Koehler
- Department of Ecology and Genetics/Limnology, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18 D, 75236 Uppsala, Sweden
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563
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Bissaro B, Várnai A, Røhr ÅK, Eijsink VGH. Oxidoreductases and Reactive Oxygen Species in Conversion of Lignocellulosic Biomass. Microbiol Mol Biol Rev 2018; 82:e00029-18. [PMID: 30257993 PMCID: PMC6298611 DOI: 10.1128/mmbr.00029-18] [Citation(s) in RCA: 154] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Biomass constitutes an appealing alternative to fossil resources for the production of materials and energy. The abundance and attractiveness of vegetal biomass come along with challenges pertaining to the intricacy of its structure, evolved during billions of years to face and resist abiotic and biotic attacks. To achieve the daunting goal of plant cell wall decomposition, microorganisms have developed many (enzymatic) strategies, from which we seek inspiration to develop biotechnological processes. A major breakthrough in the field has been the discovery of enzymes today known as lytic polysaccharide monooxygenases (LPMOs), which, by catalyzing the oxidative cleavage of recalcitrant polysaccharides, allow canonical hydrolytic enzymes to depolymerize the biomass more efficiently. Very recently, it has been shown that LPMOs are not classical monooxygenases in that they can also use hydrogen peroxide (H2O2) as an oxidant. This discovery calls for a revision of our understanding of how lignocellulolytic enzymes are connected since H2O2 is produced and used by several of them. The first part of this review is dedicated to the LPMO paradigm, describing knowns, unknowns, and uncertainties. We then present different lignocellulolytic redox systems, enzymatic or not, that depend on fluxes of reactive oxygen species (ROS). Based on an assessment of these putatively interconnected systems, we suggest that fine-tuning of H2O2 levels and proximity between sites of H2O2 production and consumption are important for fungal biomass conversion. In the last part of this review, we discuss how our evolving understanding of redox processes involved in biomass depolymerization may translate into industrial applications.
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Affiliation(s)
- Bastien Bissaro
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Aas, Norway
| | - Anikó Várnai
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Aas, Norway
| | - Åsmund K Røhr
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Aas, Norway
| | - Vincent G H Eijsink
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Aas, Norway
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564
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Moßhammer M, Schrameyer V, Jensen PØ, Koren K, Kühl M. Extracellular hydrogen peroxide measurements using a flow injection system in combination with microdialysis probes - Potential and challenges. Free Radic Biol Med 2018; 128:111-123. [PMID: 29860128 DOI: 10.1016/j.freeradbiomed.2018.05.089] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 05/14/2018] [Accepted: 05/29/2018] [Indexed: 12/29/2022]
Abstract
There is a strong need for techniques that can quantify the important reactive oxygen species hydrogen peroxide (H2O2) in complex media and in vivo. We combined chemiluminescence-based H2O2 measurements on a commercially available flow injection analysis (FIA) system with sampling of the analyte using microdialysis probes (MDPs), typically used for measurements in tissue. This allows minimally invasive, quantitative measurements of extracellular H2O2 concentration and dynamics utilizing the chemiluminescent reaction of H2O2 with acridinium ester. By coupling MDPs to the FIA system, measurements are no longer limited to filtered, liquid samples with low viscosity, as sampling via a MDP is based on a dynamic exchange through a permeable membrane with a specific cut-off. This allows continuous monitoring of dynamic changes in H2O2 concentrations, alleviates potential pH effects on the measurements, and allows for flexible application in different media and systems. We give a detailed description of the novel experimental setup and its measuring characteristics along with examples of application in different media and organisms to highlight its broad applicability, but also to discuss current limitations and challenges. The combined FIA-MDP approach for H2O2 quantification was used in different biological systems ranging from marine biology, using the model organism Exaiptasia pallida (light stress induced H2O2 release up to ~ 2.7 µM), over biomedical applications quantifying enzyme dynamics (glucose oxidase in a glucose solution producing up to ~ 60 µM H2O2 and the subsequent addition of catalase to monitor the H2O2 degradation process) and the ability of bacteria to modify their direct environment by regulating H2O2 concentrations in their surrounding media. This was shown by the bacteria Pseudomonas aeruginosa degrading ~ 18 µM background H2O2 in LB-broth. We also discuss advantages and current limitations of the FIA-MDP system, including a discussion of potential cross-sensitivity and interfering chemical species.
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Affiliation(s)
- Maria Moßhammer
- Marine Biological Section, Department of Biology, University of Copenhagen, Denmark
| | - Verena Schrameyer
- Marine Biological Section, Department of Biology, University of Copenhagen, Denmark
| | - Peter Ø Jensen
- Department of Clinical Microbiology, Rigshospitalet, Denmark; Department of Immunology and Microbiology, Costerton Biofilm Center, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Klaus Koren
- Marine Biological Section, Department of Biology, University of Copenhagen, Denmark; Department of Bioscience - Microbiology, University of Aarhus, Denmark.
| | - Michael Kühl
- Marine Biological Section, Department of Biology, University of Copenhagen, Denmark; Climate Change Cluster, University of Technology Sydney, Australia.
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565
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Verdes M. A systematic ab initio optimization of monohydrates of HCl•HNO 3•H 2SO 4 aggregates. J Mol Graph Model 2018; 86:256-263. [PMID: 30415121 DOI: 10.1016/j.jmgm.2018.10.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 10/03/2018] [Accepted: 10/27/2018] [Indexed: 11/30/2022]
Abstract
Hydrates of HCl, HNO3 and H2SO4 involved in polar stratospheric clouds capture the attention of researchers due to the mixtures composed with them. The molecular aggregates generated with these strong acids show different behaviors, geometries and nucleation reactions at atmospheric temperatures. Here is presented a systematic ab initio optimization study of monohydrates of HCl•HNO3•H2SO4 using the Density Functional Theory, by means of geometry optimizations carried out with B3LYP hybrid method and aug-cc-pVTZ basis set, a high level of theory, within Gaussian 09 program. This systematic optimization procedure consists to situate systematically the H2O molecule around the cluster in study, on the favorable positions to develop higher quantity of hydrogen bonds as possible, in order to obtain major quantity of different electronic structures of these monohydrates. Applying this systematic optimization methodology over previously optimized complexes of HCl, HNO3 and H2SO4, the present theoretical approach provides thirty-two different optimized electronic structures of monohydrates that were yielded from seven initial groups of (HCl•HNO3•H2SO4)-complex, placing the H2O in eight positions around them. Moreover, their Infrared spectra have been predicted for all (HCl•HNO3•H2SO4)-monohydrates achieved. Likewise, It is shown the outcomes of the electronic energies, relative Gibbs free energies, Infrared spectra, the wavenumbers of hydrogen bonds, inter-monomeric parameters, electronic structures of (HCl•HNO3•H2SO4)-monohydrates. These monohydrates could be considered precursors of the atmospheric heterogeneous nucleation reactions. These results can be useful to experimentalists of Catalysis, Astrophysics, Corrosion of metals and ceramics, aromatic compounds reactions, even environmental pollution and industrial smog.
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Affiliation(s)
- Marian Verdes
- Autonomous University of Madrid, Sciences Faculty, Applied Physical Chemistry Department, C-14 Avda. Tomas y Valiente, 7, Cantoblanco, 28049, Madrid, Spain.
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566
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Lei Y, Zhu C, Lu J, Zhu Y, Zhang Q, Chen T, Xiong H. Photochemical oxidation of di-n-butyl phthalate in atmospheric hydrometeors by hydroxyl radicals from nitrous acid. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:31091-31100. [PMID: 30187409 DOI: 10.1007/s11356-018-3091-y] [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: 01/15/2018] [Accepted: 08/27/2018] [Indexed: 06/08/2023]
Abstract
The photochemical oxidation of di-n-butyl phthalate (DBP) by •OH radicals from nitrous acid (HONO) in atmospheric hydrometeors was explored by two techniques, steady-state irradiation, and laser flash photolysis (LFP). The effects of atmospheric liquid parameters on DBP transformation were systematically evaluated, showing that DBP does not react with HONO directly and •OH-initiated reactions are crucial steps for consumption and transformation of DBP. Two reaction channels are operative: •OH addition and hydrogen atom abstraction. The overall rate constant for the reaction of DBP with •OH is 5.7 × 109 M-1 s-1, and its specific rate constant for addition is 3.7 × 109 M-1 s-1 determined by using laser flash photolysis technique. Comparing the individual reaction rate constant for aromatic ring addition with the total rate constant, the majority of the •OH radicals (about 65%) attack the aromatic ring. The major transformation products were identified by GC-MS, and the trends of their yields derived from both ring addition and H-abstraction with time are discussed. These results provide important insights into the photochemical transformation of DBP in atmospheric hydrometeors and contribute to atmospheric aerosol chemistry.
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Affiliation(s)
- Yu Lei
- Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, People's Republic of China
| | - Chengzhu Zhu
- Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, People's Republic of China.
| | - Jun Lu
- Center of Analysis and Measurement, Hefei University of Technology, Hefei, 230009, People's Republic of China
| | - Yongchao Zhu
- Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, People's Republic of China
| | - Qiuyue Zhang
- Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, People's Republic of China
| | - Tianhu Chen
- Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, People's Republic of China
| | - Hongbin Xiong
- Institute of Atmospheric Environment and Pollution Control, School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, People's Republic of China.
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567
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Deoli NT, Hasenstein KH. Irradiation effects of MeV protons on dry and hydrated Brassica rapa seeds. LIFE SCIENCES IN SPACE RESEARCH 2018; 19:24-30. [PMID: 30482278 DOI: 10.1016/j.lssr.2018.08.004] [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: 05/15/2018] [Revised: 07/27/2018] [Accepted: 08/15/2018] [Indexed: 06/09/2023]
Abstract
Although space radiation is a known risk for space travel and eventual colonization of Moon or Mars, relatively few data exist on radiation effects on potential crop plants. We studied Brassica rapa to assess the tolerance of seeds and seedlings to radiation by exposing dry and hydrated B. rapa seeds to 1, 2 and 3 MeV proton ions of various fluences and examined the effect on germination and root growth. Modeling penetration depth with SRIM code indicated that the applied energy was insufficient to penetrate the seeds; therefore, all energy was deposited into the tissue. Subsequent germination varied based on the incident ion energy and fluence (dose). Dry and hydrated seeds germinate after ion fluence (1013 ions cm-2) irradiation, but the germination percentage decreased with increasing fluence for ions that could penetrate the seed coat (> 1 MeV). Despite their greater volume and mass, hydrated seeds were more sensitive to irradiation than dry seeds. Damage of the seed coat after irradiation led to faster germination and initial seedling growth. Our results suggest that the seed coat represents a valuable natural radiation protection and that low energy protons, the prevailing solar radiation, are suitable for studying radiation effects in seeds and plants.
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Affiliation(s)
- Naresh T Deoli
- Louisiana Accelerator Center, University of Louisiana at Lafayette, Lafayette, LA, 70504-43600, USA
| | - Karl H Hasenstein
- Louisiana Accelerator Center, University of Louisiana at Lafayette, Lafayette, LA, 70504-43600, USA; Department of Biology, University of Louisiana at Lafayette, Lafayette, LA 70504-43602, USA.
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568
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Jeon TH, Koo MS, Kim H, Choi W. Dual-Functional Photocatalytic and Photoelectrocatalytic Systems for Energy- and Resource-Recovering Water Treatment. ACS Catal 2018. [DOI: 10.1021/acscatal.8b03521] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Tae Hwa Jeon
- Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - Min Seok Koo
- Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - Hyejin Kim
- Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
| | - Wonyong Choi
- Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
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569
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Chen Y, Tong S, Wang J, Peng C, Ge M, Xie X, Sun J. Effect of Titanium Dioxide on Secondary Organic Aerosol Formation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:11612-11620. [PMID: 30232878 DOI: 10.1021/acs.est.8b02466] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Secondary organic aerosol (SOA), a dominant air pollutant in many countries, threatens the lives of millions of people. Extensive efforts have been invested in studying the formation mechanisms and influence factors of SOA. As promising materials in eliminating air pollutants, the role of photocatalytic materials in SOA formation is unclear. In this study, TiO2 was employed to explore its impact on SOA formation during the photooxidation of m-xylene with NO x in a smog chamber. We found that the presence of TiO2 strongly suppressed SOA formation. The yields of SOA in the photooxidation experiments of m-xylene with NO x were 0.3-4%, whereas negligible SOA was formed when TiO2 was added. When ((NH4)2SO4) was introduced as seed particles, the presence of TiO2 decreased the yields of SOA from 0.3-6% to 0.3-1.6%. The sharply decreased concentrations of reactive carbonyl compounds were the direct cause of the suppression effect of TiO2 on SOA formation. However, the suppression effect was influenced by the addition of seed particles and the initial concentration of NO x. Reaction mechanisms of the photocatalysis of m-xylene with and without NO x were proposed.
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Affiliation(s)
- Yi Chen
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
- BNLMS, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Shengrui Tong
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China
| | - Jing Wang
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China
| | - Chao Peng
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Maofa Ge
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
- Center for Excellence in Regional Atmospheric Environment , Institute of Urban Environment, Chinese Academy of Sciences , Xiamen 361021 , China
| | - Xiaofeng Xie
- Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , China
| | - Jing Sun
- Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , China
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570
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Probing the Migration of Free Radicals in Solid and Liquid Media via Cr(VI) Reduction by High-Energy Electron Beam Irradiation. Sci Rep 2018; 8:15196. [PMID: 30315201 PMCID: PMC6185987 DOI: 10.1038/s41598-018-33676-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 04/04/2018] [Indexed: 11/16/2022] Open
Abstract
To probe the migration of free radicals (FRs), the reduction behaviours of hexavalent chromium (Cr(VI)) in water and ice by high-energy electron beam (HEEB) irradiation were investigated. Interestingly, the reductive efficiency (RE) of Cr(VI) in water was appreciably higher than that in ice. Thus, it was proposed that the migration ability of FRs in water is distinctly higher than that in ice, likely because the migration performance of FRs is closely related to the intermolecular distance of water molecules. Furthermore, the RE of Cr(VI) in ice decreased gradually with the distance from the irradiated area, indicating that FRs could migrate in ice and that the migration performance was closely related to the RE. Additionally, FRs (hydrated electrons (\documentclass[12pt]{minimal}
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\begin{document}$${{\rm{e}}}_{{\rm{aq}}}^{-}$$\end{document}eaq−) and hydrogen radicals (·H)) generated during the irradiation process played a key role in the reduction of Cr(VI). Hydroxyl radicals (·OH) and H2O2 were the dominant negative factors for the reduction because of their oxidizing effects, but these factors could be eliminated by the removal of ·OH. This work reveals the migration performance of FRs in different media for the first time. This result may be useful for basic and applied studies in fields of environmental science related to FRs.
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571
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Johnson EM, Waggoner AR, Xia S, Luk HL, Hadad CM, Poole JS. Reactivity of Hydroxyl Radical in Nonaqueous Phases: Addition Reactions. J Phys Chem A 2018; 122:8326-8335. [DOI: 10.1021/acs.jpca.8b08463] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Erica M. Johnson
- Department of Chemistry, Ball State University, Muncie, Indiana 47306, United States
| | - Abygail R. Waggoner
- Department of Chemistry, Ball State University, Muncie, Indiana 47306, United States
| | - Shijing Xia
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Hoi Ling Luk
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Christopher M. Hadad
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - James S. Poole
- Department of Chemistry, Ball State University, Muncie, Indiana 47306, United States
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572
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Vione D. A model assessment of the role played by the carbonate (CO 3-) and dibromide (Br 2-) radicals in the photodegradation of glutathione in sunlit fresh- and salt-waters. CHEMOSPHERE 2018; 209:401-410. [PMID: 29936114 DOI: 10.1016/j.chemosphere.2018.06.066] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 06/06/2018] [Accepted: 06/08/2018] [Indexed: 06/08/2023]
Abstract
Glutathione (GLU) is a peptidic thiol that plays important anti-oxidant roles in organisms and that occurs in both freshwater and seawater, where it can undergo both bio- and photodegradation. Recent results have elucidated the role played by OH, 1O2, H2O2 and other yet unidentified transients in GLU photochemistry, but very little is known of the role of CO3-. This is an important gap because CO3- is usually very reactive towards electron-rich compounds including thiols and mercaptans. Very little is also known on the environmental importance of the reaction between GLU and Br2-, which could account for the literature finding that GLU phototransformation is enhanced in simulated seawater compared to freshwater. By means of a photochemical model approach based on the APEX software (Aqueous Photochemistry of Environmentally-occurring Xenobiotics), here we provide an assessment of the role that several photoreactants, including most notably CO3- and Br2-, have in the photodegradation of GLU (both the whole substance and the separate neutral and mono-anionic species) under representative fresh- and saltwater conditions. Our model suggests that CO3- would dominate the photodegradation of GLU in low-DOC and high-pH freshwater, which are the only freshwater conditions that really ensure GLU photodegradation to be competitive with biotransformation. This result supports the potential key importance of CO3- in the environmental photochemistry of GLU. In surface seawater and in brackish water, GLU phototransformation might be dominated by the Br2- reaction (the role of additional halogen species such as Cl2- and ClBr- is still unknown).
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Affiliation(s)
- Davide Vione
- Dipartimento di Chimica, Università di Torino, Via Pietro Giuria 5, 10125 Torino, Italy; Università di Torino, Centro Interdipartimentale NatRisk, Largo Paolo Braccini 2, 10095 Grugliasco TO, Italy.
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573
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Waiskopf N, Ben-Shahar Y, Banin U. Photocatalytic Hybrid Semiconductor-Metal Nanoparticles; from Synergistic Properties to Emerging Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1706697. [PMID: 29656489 DOI: 10.1002/adma.201706697] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 01/09/2018] [Indexed: 05/07/2023]
Abstract
Hybrid semiconductor-metal nanoparticles (HNPs) manifest unique combined and often synergetic properties stemming from the materials combination. These structures exhibit spatial charge separation across the semiconductor-metal junction upon light absorption, enabling their use as photocatalysts. So far, the main impetus of photocatalysis research in HNPs addresses their functionality in solar fuel generation. Recently, it was discovered that HNPs are functional in efficient photocatalytic generation of reactive oxygen species (ROS). This has opened the path for their implementation in diverse biomedical and industrial applications where high spatially temporally resolved ROS formation is essential. Here, the latest studies on the synergistic characteristics of HNPs are summarized, including their optical, electrical, and chemical properties and their photocatalytic function in the field of solar fuel generation is briefly discussed. Recent studies are then focused concerning photocatalytic ROS formation with HNPs under aerobic conditions. The emergent applications of this capacity are then highlighted, including light-induced modulation of enzymatic activity, photodynamic therapy, antifouling, wound healing, and as novel photoinitiators for 3D-printing. The superb photophysical and photocatalytic properties of HNPs offer already clear advantages for their utility in scenarios requiring on-demand light-induced radical formation and the full potential of HNPs in this context is yet to be revealed.
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Affiliation(s)
- Nir Waiskopf
- The Institute of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
| | - Yuval Ben-Shahar
- The Institute of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
| | - Uri Banin
- The Institute of Chemistry and Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 91904, Israel
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574
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Welsch R. Low‐Temperature Thermal Rate Constants for the Water Formation Reaction H
2
+OH from Rigorous Quantum Dynamics Calculations. Angew Chem Int Ed Engl 2018; 57:13150-13153. [DOI: 10.1002/anie.201807666] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Ralph Welsch
- Center for Free-Electron Laser Science, DESY Notkestraße 85 22607 Hamburg Germany
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575
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Welsch R. Low‐Temperature Thermal Rate Constants for the Water Formation Reaction H
2
+OH from Rigorous Quantum Dynamics Calculations. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201807666] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ralph Welsch
- Center for Free-Electron Laser Science, DESY Notkestraße 85 22607 Hamburg Germany
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576
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Abstract
Due to the adverse effect of atmospheric aerosols on public health and their ability to affect climate, extensive research has been undertaken in recent decades to understand their sources and sinks, as well as to study their physical and chemical properties. Atmospheric aerosols are important players in the Earth’s radiative budget, affecting incoming and outgoing solar radiation through absorption and scattering by direct and indirect means. While the cooling properties of pure inorganic aerosols are relatively well understood, the impact of organic aerosols on the radiative budget is unclear. Additionally, organic aerosols are transformed through chemical reactions during atmospheric transport. The resulting complex mixture of organic aerosol has variable physical and chemical properties that contribute further to the uncertainty of these species modifying the radiative budget. Correlations between oxidative processing and increased absorptivity, hygroscopicity, and cloud condensation nuclei activity have been observed, but the mechanisms behind these phenomena have remained unexplored. Herein, we review environmentally relevant heterogeneous mechanisms occurring on interfaces that contribute to the processing of aerosols. Recent laboratory studies exploring processes at the aerosol–air interface are highlighted as capable of generating the complexity observed in the environment. Furthermore, a variety of laboratory methods developed specifically to study these processes under environmentally relevant conditions are introduced. Remarkably, the heterogeneous mechanisms presented might neither be feasible in the gas phase nor in the bulk particle phase of aerosols at the fast rates enabled on interfaces. In conclusion, these surface mechanisms are important to better understand how organic aerosols are transformed in the atmosphere affecting the environment.
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577
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Li H, Li X, Shi W, Xu Y, Ma H. Rationally Designed Fluorescence .
OH Probe with High Sensitivity and Selectivity for Monitoring the Generation of .
OH in Iron Autoxidation without Addition of H2
O2. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201808400] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Hongyu Li
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Analytical Chemistry for Living Biosystems; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- University of the Chinese Academy of Sciences; Beijing 100049 China
| | - Xiaohua Li
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Analytical Chemistry for Living Biosystems; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Wen Shi
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Analytical Chemistry for Living Biosystems; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Yanhui Xu
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Analytical Chemistry for Living Biosystems; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Huimin Ma
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Analytical Chemistry for Living Biosystems; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- University of the Chinese Academy of Sciences; Beijing 100049 China
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578
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Kong L, Fang G, Kong Y, Xie M, Natarajan V, Zhou D, Zhan J. Cu 2O@β-cyclodextrin as a synergistic catalyst for hydroxyl radical generation and molecular recognitive destruction of aromatic pollutants at neutral pH. JOURNAL OF HAZARDOUS MATERIALS 2018; 357:109-118. [PMID: 29870895 DOI: 10.1016/j.jhazmat.2018.05.065] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 05/28/2018] [Accepted: 05/29/2018] [Indexed: 06/08/2023]
Abstract
Wastewater systems contain a large number of compounds, such as anthropogenic aromatic pollutants and natural organic matter (NOM), and usually have pH higher than 4. Fenton-like reaction is the most widespread method for removal of organic pollutants, but their reactivity with H2O2 may be inhibited by NOM due to the competition of hydroxyl radicals and chelating agents. In this work, Cu2O@β-cyclodextrin was developed to achieve the collaboration between molecular recognition and Fenton-like catalysis to destruct aromatic pollutants at neutral pH. In Cu2O@β-CD, covalent CuOC bond was topotaxially converted from CuCl assisted by β-CD at room temperature. Covalently linked β-CD could keep humic acid from interfering catalytic performance of Cu2O surfaces and inhibit the leaching of copper. A higher catalytic ability was observed for Cu2O@β-CD with rate constant 0.0331 min-1 than Cu2O (0.0064 min-1) at neutral pH. A mechanism of synergistic catalysis was proposed on the basis of Cu+, β-CD and phenoxo-Cu2+ complexes in the Cu2O@β-CD/BPA/H2O2 system. The strategy of coupling molecular recognition into Fenton-like reaction provides an efficient and promising approach to the destruction of aromatic pollutants at neutral pH.
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Affiliation(s)
- Lingshuai Kong
- Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Department of Chemistry, Shandong University, Jinan 250100, China
| | - Guodong Fang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008, China
| | - Ya Kong
- Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Department of Chemistry, Shandong University, Jinan 250100, China
| | - Meng Xie
- Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Department of Chemistry, Shandong University, Jinan 250100, China
| | - Vinothkumar Natarajan
- Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Department of Chemistry, Shandong University, Jinan 250100, China
| | - Dongmei Zhou
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008, China
| | - Jinhua Zhan
- Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Department of Chemistry, Shandong University, Jinan 250100, China.
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579
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Chen N, Fang G, Liu G, Zhou D, Gao J, Gu C. The effects of Fe-bearing smectite clays on OH formation and diethyl phthalate degradation with polyphenols and H 2O 2. JOURNAL OF HAZARDOUS MATERIALS 2018; 357:483-490. [PMID: 29936346 DOI: 10.1016/j.jhazmat.2018.06.030] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2018] [Revised: 05/19/2018] [Accepted: 06/13/2018] [Indexed: 06/08/2023]
Abstract
The natural formation of hydroxyl radicals (OH) is important for the attenuation of organic contaminants. In this study, seven model polyphenols were selected to react with four types of smectite clays with varied Fe contents in the presence of H2O2. Diethyl phthalate (DEP) was selected as a model organic contaminant due to its wide distribution in environment. The results show the appearance of Fe-bearing smectite clays can significantly promote ·OH formation with polyphenols and H2O2 under anoxic conditions; clay particle size, the content and location of lattice Fe in smectite clays greatly affect OH formation. Hydrogen bond between phenolic group and smectite surfaces, and cation assisted hydrogen bond between carboxylic group and clay surfaces are important types of complexation. Electrons can be transferred from coordinated polyphenols to structural Fe(III) atoms in tetrahedral layers or at broken edges to form structural Fe(II) and/or semiquinone radicals, both of which can induce H2O2 decomposition to OH. DEP can be degraded by OH attack, and the main products are proposed as phthalic acid, monomethyl phthalate, hydroxyl-diethyl phthalates. Our findings suggest that Fe(III)-bearing smectite clay can be reduced by polyphenol and produce OH in anoxic environments, which can induce organic contaminants transformation.
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Affiliation(s)
- Ning Chen
- Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science, CAS, Nanjing, Jiangsu Province, 210008, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Guodong Fang
- Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science, CAS, Nanjing, Jiangsu Province, 210008, China
| | - Guangxia Liu
- Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science, CAS, Nanjing, Jiangsu Province, 210008, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Dongmei Zhou
- Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science, CAS, Nanjing, Jiangsu Province, 210008, China
| | - Juan Gao
- Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science, CAS, Nanjing, Jiangsu Province, 210008, China.
| | - Cheng Gu
- State Key Laboratory of Pollution Control and Resource Reuse School of the Environment, Nanjing University, Nanjing, Jiangsu Province, 210023, China.
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580
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Li H, Li X, Shi W, Xu Y, Ma H. Rationally Designed Fluorescence .
OH Probe with High Sensitivity and Selectivity for Monitoring the Generation of .
OH in Iron Autoxidation without Addition of H2
O2. Angew Chem Int Ed Engl 2018; 57:12830-12834. [DOI: 10.1002/anie.201808400] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 08/13/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Hongyu Li
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Analytical Chemistry for Living Biosystems; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- University of the Chinese Academy of Sciences; Beijing 100049 China
| | - Xiaohua Li
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Analytical Chemistry for Living Biosystems; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Wen Shi
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Analytical Chemistry for Living Biosystems; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Yanhui Xu
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Analytical Chemistry for Living Biosystems; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Huimin Ma
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Analytical Chemistry for Living Biosystems; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- University of the Chinese Academy of Sciences; Beijing 100049 China
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581
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Ofori I, Maddila S, Lin J, Jonnalagadda SB. Ozone initiated inactivation of Escherichia coli and Staphylococcus aureus in water: Influence of selected organic solvents prevalent in wastewaters. CHEMOSPHERE 2018; 206:43-50. [PMID: 29730564 DOI: 10.1016/j.chemosphere.2018.04.164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 04/26/2018] [Accepted: 04/27/2018] [Indexed: 06/08/2023]
Abstract
Absorption, stability and reactivity of ozone in water are critical parameters to determine its efficiency in microbial inactivation. In this study, the influence of four water-soluble organic solvents commonly discharged from industrial lines into wastewater systems, namely; ethanol, methanol, ethyl acetate and dimethyl sulfoxide (DMSO) on the ozone-facilitated inactivation of Escherichia coli and Staphylococcus aureus in water was investigated. Ozone absorption (up to 12 min) as a function of ozone aeration time, and the decomposition rate were spectrophotometrically monitored in the presence of 2.5% and 5% concentrations of each organic solvent. Their consequent effect on bacterial inactivation was determined. The inactivation kinetics were described using the efficiency factor Hom model. Residual concentrations of absorbed ozone in solutions with ethyl acetate or DMSO were relatively higher than those in methanol or ethanol-containing solutions. DMSO and ethyl acetate enhanced the stability of ozone in water, characterised by a lower decomposition rate constant in DMSO (kd = 3.81 × 10-2 M-1 s-1) and ethyl acetate (kd = 4.45 × 10-2 M-1 s-1) solutions, in contrast with that in methanol (kd = 1.13 × 10-1 M-1 s-1), where the decomposition rate was higher. The faster absorption and stability of ozone in ethyl acetate and DMSO corresponded with an observed increase in the log inactivation of E. coli and S. aureus by approximately 2-fold relative to that in methanol.
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Affiliation(s)
- Isaac Ofori
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban-4000, South Africa
| | - Suresh Maddila
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban-4000, South Africa
| | - Johnson Lin
- School of Life Sciences, Discipline of Microbiology, University of KwaZulu-Natal, Chiltern Hills, Durban- 4000, South Africa
| | - Sreekantha B Jonnalagadda
- School of Chemistry & Physics, University of KwaZulu-Natal, Westville Campus, Chiltern Hills, Durban-4000, South Africa.
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582
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Aguilar S, Rosado D, Moreno-Andrés J, Cartuche L, Cruz D, Acevedo-Merino A, Nebot E. Inactivation of a wild isolated Klebsiella pneumoniae by photo-chemical processes: UV-C, UV-C/H2O2 and UV-C/H2O2/Fe3+. Catal Today 2018. [DOI: 10.1016/j.cattod.2017.10.043] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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583
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de Melo da Silva L, Gozzi F, Sirés I, Brillas E, de Oliveira SC, Machulek A. Degradation of 4-aminoantipyrine by electro-oxidation with a boron-doped diamond anode: Optimization by central composite design, oxidation products and toxicity. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 631-632:1079-1088. [PMID: 29727934 DOI: 10.1016/j.scitotenv.2018.03.092] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 02/12/2018] [Accepted: 03/09/2018] [Indexed: 06/08/2023]
Abstract
Electro-oxidation with electrogenerated H2O2 (EO-H2O2) was applied to treat acidic aqueous solutions of 4-aminoantipyrine (4-AA), a persistent drug metabolite of dipyrone, in sulfate medium. Trials were made using a boron-doped diamond anode in the presence of H2O2 electrogenerated on site. A 24 central composite design (CCD) was employed to evaluate the effect of four independent variables, namely current density (j), pH, 4-AA concentration and electrolysis time, on the percentages of degradation and mineralization, as well as on mineralization current efficiency (MCE). Predicted responses agreed with observed values, showing linear trendlines with good R2 and R2adj values. The degradation was optimum at j=77.5mAcm-2, pH3.5 and 62.5mgL-1 4-AA, leading to 63% and 99% removal after 3 and 7min, respectively. For those solutions, the largest mineralization was found at j=77.5mAcm-2, attaining 45% abatement at 175min. Low MCE values were obtained in all electrolyses. An initial route for 4-AA degradation is proposed based on one dimer and eleven aromatic and aliphatic intermediates detected in the treated solutions at pH3.5 by LC-MS. The initial 62.5mgL-1 solution at pH3.5 presented acute toxicity on Artemia salina larvae, with LC50=13.6mgL-1, being substantially reduced after 3 and 7min of EO-H2O2 at j=77.5mAcm-2 due to the formation of less toxic derivatives.
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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
| | - 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
| | - Ignasi Sirés
- Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain.
| | - Enric Brillas
- Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, c/Martí i Franquès 1-11, 08028 Barcelona, Spain
| | - 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.
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584
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Lyngsie G, Krumina L, Tunlid A, Persson P. Generation of hydroxyl radicals from reactions between a dimethoxyhydroquinone and iron oxide nanoparticles. Sci Rep 2018; 8:10834. [PMID: 30018415 PMCID: PMC6050337 DOI: 10.1038/s41598-018-29075-5] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 07/04/2018] [Indexed: 11/25/2022] Open
Abstract
The hydroxyl radical (·OH) is a powerful oxidant that is produced in a wide range of environments via the Fenton reaction (Fe2+ + H2O2 → Fe3+ + ·OH + OH-). The reactants are formed from the reduction of Fe3+ and O2, which may be promoted by organic reductants, such as hydroquinones. The aim of this study was to investigate the extent of ·OH formation in reactions between 2,6-dimethoxyhydroquinone (2,6-DMHQ) and iron oxide nanoparticles. We further compared the reactivities of ferrihydrite and goethite and investigated the effects of the O2 concentration and pH on the generation of ·OH. The main finding was that the reactions between 2,6-DMHQ and iron oxide nanoparticles generated substantial amounts of ·OH under certain conditions via parallel reductive dissolution and catalytic oxidation reactions. The presence of O2 was essential for the catalytic oxidation of 2,6-DMHQ and the generation of H2O2. Moreover, the higher reduction potential of ferrihydrite relative to that of goethite made the former species more susceptible to reductive dissolution, which favored the production of ·OH. The results highlighted the effects of surface charge and ligand competition on the 2,6-DMHQ oxidation processes and showed that the co-adsorption of anions can promote the generation of ·OH.
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Affiliation(s)
- Gry Lyngsie
- Center of Environmental and Climate Research, Lund University, SE-223 62, Lund, Sweden
| | - Lelde Krumina
- Center of Environmental and Climate Research, Lund University, SE-223 62, Lund, Sweden.,Department of Biology, Lund University, SE-223 62, Lund, Sweden
| | - Anders Tunlid
- Department of Biology, Lund University, SE-223 62, Lund, Sweden
| | - Per Persson
- Center of Environmental and Climate Research, Lund University, SE-223 62, Lund, Sweden. .,Department of Biology, Lund University, SE-223 62, Lund, Sweden.
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585
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Bu Y, Wang L, Chen B, Niu R, Chen Y. Effects of typical water components on the UV 254 photodegradation kinetics of haloacetic acids in water. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2018.02.045] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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586
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Photochemical reaction kinetics and mechanisms of diethyl phthalate with N (III) in the atmospheric aqueous environment. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.05.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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587
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Sah C, Yadav AK, Venkataramani S. Deciphering Stability of Five-Membered Heterocyclic Radicals: Balancing Act Between Delocalization and Ring Strain. J Phys Chem A 2018; 122:5464-5476. [PMID: 29791155 DOI: 10.1021/acs.jpca.8b03145] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Computational studies on five-membered heterocycles with single heteroatom and their isomeric dehydro-borole 1a-1c, cyclopentadiene 2a-2c, pyrrole 3a-3c, furan 4b-4c, phosphole 5a-5c, and thiophene 6b-6c radicals have been carried out. Geometrical aspects through ground state electronic structures and stability aspects using bond dissociation energies (BDE) and radical stabilization energies (RSE) have been envisaged in this regard. Spin densities, electrostatic potentials (ESP), and natural bond orbital (NBO) analysis unveiled the extent of spin delocalization. The estimated nucleus-independent chemical shifts (NICS) values revealed the difference in aromaticity characteristics of radicals. Particularly the heteroatom centered radicals exhibit odd electron π-delocalized systems with a quasi-antiaromatic character. Various factors such as, the relative position of the radical center with respect to heteroatoms, resonance, ring strain and orbital interactions influence the stability that follows the order: heteroatom centered > β-centered > α-centered radicals. Among the influences of various factors, we confirmed the existence of a competition between delocalization and the ring strain, and the interplay of both decides the overall stability order.
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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
| | - Ajit Kumar Yadav
- 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
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588
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Kawade MN, Srinivas D, Upadhyaya HP. Gas Phase OH Radical Reaction with 2‐Chloroethyl Vinyl Ether in the 256–333 K Temperature Range: A Combined LP‐LIF and Computational Study. ChemistrySelect 2018. [DOI: 10.1002/slct.201800885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Monali N. Kawade
- Radiation & Photochemistry DivisionBhabha Atomic Research Centre, HBNI, Trombay Mumbai – 400 085 India
| | - Doddipatla Srinivas
- Radiation & Photochemistry DivisionBhabha Atomic Research Centre, HBNI, Trombay Mumbai – 400 085 India
| | - Hari P. Upadhyaya
- Radiation & Photochemistry DivisionBhabha Atomic Research Centre, HBNI, Trombay Mumbai – 400 085 India
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589
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Oladeinde A, Lipp E, Chen CY, Muirhead R, Glenn T, Cook K, Molina M. Transcriptome Changes of Escherichia coli, Enterococcus faecalis, and Escherichia coli O157:H7 Laboratory Strains in Response to Photo-Degraded DOM. Front Microbiol 2018; 9:882. [PMID: 29867797 PMCID: PMC5953345 DOI: 10.3389/fmicb.2018.00882] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 04/17/2018] [Indexed: 11/26/2022] Open
Abstract
In this study, we investigated gene expression changes in three bacterial strains (Escherichia coli C3000, Escherichia coli O157:H7 B6914, and Enterococcus faecalis ATCC 29212), commonly used as indicators of water quality and as control strains in clinical, food, and water microbiology laboratories. Bacterial transcriptome responses from pure cultures were monitored in microcosms containing water amended with manure-derived dissolved organic matter (DOM), previously exposed to simulated sunlight for 12 h. We used RNA sequencing (RNA-seq) and quantitative real-time reverse transcriptase (qRT-PCR) to compare differentially expressed temporal transcripts between bacteria incubated in microcosms containing sunlight irradiated and non-irradiated DOM, for up to 24 h. In addition, we used whole genome sequencing simultaneously with RNA-seq to identify single nucleotide variants (SNV) acquired in bacterial populations during incubation. These results indicate that E. coli and E. faecalis have different mechanisms for removal of reactive oxygen species (ROS) produced from irradiated DOM. They are also able to produce micromolar concentrations of H2O2 from non-irradiated DOM, that should be detrimental to other bacteria present in the environment. Notably, this study provides an assessment of the role of two conjugative plasmids carried by the E. faecalis and highlights the differences in the overall survival dynamics of environmentally-relevant bacteria in the presence of naturally-produced ROS.
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Affiliation(s)
- Adelumola Oladeinde
- National Exposure Research Laboratory, Student Volunteer, U.S. Environmental Protection Agency, Office of Research and Development, Athens, GA, United States.,Department of Environmental Health Science, University of Georgia, Athens, GA, United States
| | - Erin Lipp
- Department of Environmental Health Science, University of Georgia, Athens, GA, United States
| | - Chia-Ying Chen
- National Exposure Research Laboratory, National Research Council Associate, U.S. Environmental Protection Agency, Office of Research and Development, Athens, GA, United States
| | | | - Travis Glenn
- Department of Environmental Health Science, University of Georgia, Athens, GA, United States
| | - Kimberly Cook
- Bacterial Epidemiology and Antimicrobial Resistance Research Unit, U.S. National Poultry Research Center, Agricultural Research Service, United States Department of Agriculture, Athens, GA, United States
| | - Marirosa Molina
- National Exposure Research Laboratory, U.S. Environmental Protection Agency, Office of Research and Development, Athens, GA, United States
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590
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Deng F, Olvera-Vargas H, Garcia-Rodriguez O, Qiu S, Yang J, Lefebvre O. The synergistic effect of nickel-iron-foam and tripolyphosphate for enhancing the electro-Fenton process at circum-neutral pH. CHEMOSPHERE 2018; 201:687-696. [PMID: 29547857 DOI: 10.1016/j.chemosphere.2018.02.186] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 02/26/2018] [Accepted: 02/27/2018] [Indexed: 06/08/2023]
Abstract
A composite nickel-iron-foam (Ni-Fe-F) electrode was used as a cathode in the electro-Fenton (EF) process at circum-neutral pH in the presence of sodium tripolyphosphate (TPP) as supporting electrolyte. It was found that phenol degradation was dramatically improved by the synergistic effect of Ni-Fe-F and TPP, reaching 100% removal in 40 min, with kapp = (8.90 ± 0.12) × 10-2 min-1, which was about 18 times higher than that of Ni-Fe-F with sulfate as conventional electrolyte at pH 3.00 (kapp = (5.00 ± 0.14) × 10-3 min-1). A (75.00 ± 1.67)% mineralization yield was attained after 4-h treatment time. Ni-Fe-F proved capable of providing the Fe2+ ions necessary to catalyze the Fenton's reaction via a controlled chemical/electrochemical redox process. In addition, Ni-Fe-F promoted the chemical and electrochemical generation of H2O2. With respect to TPP, its chelation with Fe ions prevented iron precipitation at neutral and higher pH values, extending the pH range of the Fenton's reaction. Furthermore, the TPP ligand promoted the activation of molecular O2 for the chemical production of OH, enhancing the process efficiency. By overcoming these common limitations of conventional EF in K2SO4 electrolyte, the Ni-Fe-F/TPP system represents a more sustainable alternative for practical application of EF. A degradation pathway for phenol mineralization with homogeneous and heterogeneous OH produced by the EF Ni-Fe-F/TPP system is proposed based on the identification of the oxidation by-products.
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Affiliation(s)
- Fengxia Deng
- State Key Laboratory of Urban Water Resources Center, Department of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, PR China; Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Dr. 2, Singapore, 117576, Singapore
| | - Hugo Olvera-Vargas
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Dr. 2, Singapore, 117576, Singapore
| | - Orlando Garcia-Rodriguez
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Dr. 2, Singapore, 117576, Singapore
| | - Shan Qiu
- State Key Laboratory of Urban Water Resources Center, Department of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, PR China.
| | - Jixian Yang
- State Key Laboratory of Urban Water Resources Center, Department of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, PR China
| | - Olivier Lefebvre
- Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Dr. 2, Singapore, 117576, Singapore.
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591
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Welsch R. Rigorous close-coupling quantum dynamics calculation of thermal rate constants for the water formation reaction of H2 + OH on a high-level PES. J Chem Phys 2018; 148:204304. [DOI: 10.1063/1.5033358] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Ralph Welsch
- Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607 Hamburg, Germany
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592
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Rapf R, Perkins RJ, Dooley MR, Kroll JA, Carpenter BK, Vaida V. Environmental Processing of Lipids Driven by Aqueous Photochemistry of α-Keto Acids. ACS CENTRAL SCIENCE 2018; 4:624-630. [PMID: 29806009 PMCID: PMC5968514 DOI: 10.1021/acscentsci.8b00124] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Indexed: 06/08/2023]
Abstract
Sunlight can initiate photochemical reactions of organic molecules though direct photolysis, photosensitization, and indirect processes, often leading to complex radical chemistry that can increase molecular complexity in the environment. α-Keto acids act as photoinitiators for organic species that are not themselves photoactive. Here, we demonstrate this capability through the reaction of two α-keto acids, pyruvic acid and 2-oxooctanoic acid, with a series of fatty acids and fatty alcohols. We show for five different cases that a cross-product between the photoinitiated α-keto acid and non-photoactive species is formed during photolysis in aqueous solution. Fatty acids and alcohols are relatively unreactive species, which suggests that α-keto acids are able to act as radical initiators for many atmospherically relevant molecules found in the sea surface microlayer and on atmospheric aerosol particles.
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Affiliation(s)
- Rebecca
J. Rapf
- Department
of Chemistry and Biochemistry and Cooperative Institute for Research
in Environmental Sciences, University of
Colorado Boulder, Boulder, Colorado 80309, United States
| | - Russell J. Perkins
- Department
of Chemistry and Biochemistry and Cooperative Institute for Research
in Environmental Sciences, University of
Colorado Boulder, Boulder, Colorado 80309, United States
| | - Michael R. Dooley
- Department
of Chemistry and Biochemistry and Cooperative Institute for Research
in Environmental Sciences, University of
Colorado Boulder, Boulder, Colorado 80309, United States
| | - Jay A. Kroll
- Department
of Chemistry and Biochemistry and Cooperative Institute for Research
in Environmental Sciences, University of
Colorado Boulder, Boulder, Colorado 80309, United States
| | - Barry K. Carpenter
- School
of Chemistry and the Physical Organic Chemistry Centre, Cardiff University, Cardiff CF10 3AT, United
Kingdom
| | - Veronica Vaida
- Department
of Chemistry and Biochemistry and Cooperative Institute for Research
in Environmental Sciences, University of
Colorado Boulder, Boulder, Colorado 80309, United States
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593
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Vione D, Encinas A, Fabbri D, Calza P. A model assessment of the potential of river water to induce the photochemical attenuation of pharmaceuticals downstream of a wastewater treatment plant (Guadiana River, Badajoz, Spain). CHEMOSPHERE 2018; 198:473-481. [PMID: 29425948 DOI: 10.1016/j.chemosphere.2018.01.156] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2017] [Revised: 01/18/2018] [Accepted: 01/28/2018] [Indexed: 05/27/2023]
Abstract
We predicted the possible direct and indirect phototransformation kinetics of carbamazepine (CBZ), ibuprofen (IBU) and diclofenac (DIC) in river water, based on data of water chemistry obtained for the Guadiana River near Badajoz (Southwestern Spain) during a year-round sampling campaign. The three compounds were chosen, (i) because they occurred at the outlet of the wastewater treatment plant (WWTP) in Badajoz, as well as in river water sampled 1 km downstream of the WWTP, and (ii) because their photochemical fate in surface waters is known well enough to be modelled. The predicted phototransformation kinetics would be negligible in winter and fastest in April-August, with comparable rate constants in April through August despite differences in sunlight irradiance. Favourable water chemistry would in fact offset the lower irradiance, and vice versa. Half-life times of at least three weeks - one month are predicted for CBZ and IBU. Photodegradation may be an important attenuation pathway for biorecalcitrant CBZ, while IBU photochemistry is unlikely to be competitive with other processes including biodegradation. The predicted DIC photochemical half-life times of 7-10 days in April-August would be comparable with the biodegradation kinetics data reported in the literature. Photochemistry might not induce extensive phototransformation of xenobiotics in the Guadiana River under normal flow conditions, but it could become important in the case of low flow produced by water scarcity.
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Affiliation(s)
- Davide Vione
- Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy; Università di Torino, Centro Interdipartimentale NatRisk, Largo Paolo Braccini 2, 10095 Grugliasco TO, Italy.
| | - Angel Encinas
- FCC Aqualia S.A., C/ Montesinos 28, 06002, Badajoz, Spain
| | - Debora Fabbri
- Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy
| | - Paola Calza
- Università di Torino, Dipartimento di Chimica, Via Pietro Giuria 5, 10125 Torino, Italy
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594
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He CB, Pan KL, Chang MB. Catalytic oxidation of trichloroethylene from gas streams by perovskite-type catalysts. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:11584-11594. [PMID: 29429106 DOI: 10.1007/s11356-018-1440-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 01/30/2018] [Indexed: 06/08/2023]
Abstract
Three perovskite-type catalysts including LaMnO3, La0.8Ce0.2MnO3, and La0.8Ce0.2 Mn0.8Ni0.2O3 are prepared using citric acid sol-gel method and evaluated as catalyst for the oxidation of trichloroethylene (TCE) in air with temperature ranging from 100 to 600 °C. The physicochemical properties of three perovskite-type catalysts were characterized by SEM, EDS, XRD, BET, and XPS to investigate the relationship with catalytic activities. The results show that the removal efficiency of TCE achieved with La0.8Ce0.2Mn0.8Ni0.2O3 (the best one) reaches 100% at 400 °C and the mineralization efficiency reaches 100% at 600 °C. The enhanced activity can be attributed to the addition of Ce and Ni which increases the surface areas, active oxygen species, and the redox ability of the Mn4+/Mn3+ ratio on the catalyst surface. As La0.8Ce0.2Mn0.8Ni0.2O3 is applied for TCE oxidation, the main intermediate chlorinated byproduct detected is tetrachloroethylene (C2Cl4) which is generated by the reaction of TCE and chlorine (Cl2). The activation energy for the TCE oxidation with La0.8Ce0.2Mn0.8Ni0.2O3 catalyst is 51 kJ/mol using kinetic models of power-law type.
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Affiliation(s)
- Cheng Bin He
- Graduate Institute of Environmental Engineering, National Central University, No.300, Jhongda Road, Jhongli District, Taoyuan City, 32001, Taiwan
| | - Kuan Lun Pan
- Graduate Institute of Environmental Engineering, National Central University, No.300, Jhongda Road, Jhongli District, Taoyuan City, 32001, Taiwan
| | - Moo Been Chang
- Graduate Institute of Environmental Engineering, National Central University, No.300, Jhongda Road, Jhongli District, Taoyuan City, 32001, Taiwan.
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595
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Folarin OR, Adaramoye OA, Akanni OO, Olopade JO. Changes in the brain antioxidant profile after chronic vanadium administration in mice. Metab Brain Dis 2018; 33:377-385. [PMID: 28744799 DOI: 10.1007/s11011-017-0070-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Accepted: 07/11/2017] [Indexed: 12/11/2022]
Abstract
Vanadium is known to induce reactive oxygen species (ROS) in biological systems. Exposure to vanadium has been linked to neurological defects affecting the central nervous system (CNS) early in life and culminates later to neurodegeneration. This study was designed to evaluate the effects of chronic vanadium exposure on antioxidant profile in mice, and progressive changes after withdrawal from treatment. A total of 85 male BALB/c mice (4 weeks old) were used for the experiment and were divided into three groups of vanadium exposed (3 mg/kg i.p at 3-18 months treatment), matched controls, and animals exposed to vanadium for three months and thereafter vanadium was withdrawn. Vanadium exposure caused significant increases (p<0.05) in levels of malondialdehyde (MDA), hydrogen peroxide (H2O2) generation and nitric oxide with a concomitant decrease (p<0.05) in the activities of superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione-S-transferase and a decline in the level of reduced glutathione (GSH) after 6 months of vanadium exposure in the brain. This trend continued in all vanadium-exposed groups (9, 12, 15 and 18 months) relative to the matched controls. Withdrawal after 3 months of vanadium exposure significantly reversed oxidative stress in intoxicated mice from 9 to 15 months after vanadium withdrawal. We have shown that chronic administration of vanadium led to oxidative stress in the brain which is reversible only after a long period of vanadium withdrawal.
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Affiliation(s)
- O R Folarin
- Department of Veterinary Anatomy, Faculty of Veterinary Medicine, University of Ibadan, Ibadan, Nigeria
- Department of Medical Laboratory Science, Ladoke Akintola University, Oshogbo, Nigeria
| | - O A Adaramoye
- Department of Biochemistry, Faculty of Basic Medical Sciences, University of Ibadan, Ibadan, Nigeria
| | - O O Akanni
- Department of Biochemistry, Faculty of Basic Medical Sciences, University of Ibadan, Ibadan, Nigeria
| | - J O Olopade
- Department of Veterinary Anatomy, Faculty of Veterinary Medicine, University of Ibadan, Ibadan, Nigeria.
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596
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Ge P, Yu H, Chen J, Qu J, Luo Y. Photolysis mechanism of sulfonamide moiety in five-membered sulfonamides: A DFT study. CHEMOSPHERE 2018; 197:569-575. [PMID: 29407819 DOI: 10.1016/j.chemosphere.2018.01.041] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 01/09/2018] [Accepted: 01/11/2018] [Indexed: 06/07/2023]
Abstract
Quantum chemical calculations have been performed to investigate the photolysis mechanism of relatively susceptible sulfonamide moiety of five-membered sulfonamide (SA) antibiotics, such as sulfamethoxazole, sulfisoxazole, sulfamethizole, and sulfathiazole. The results show that the ·OH-mediated indirect photolysis of sulfonamide linkage has two possible multi-step reaction pathways, viz., H-abstraction and electrophilic C1-attack, which is contrast to previously reported one-step cleavage manner. The newly proposed indirect photolysis mechanisms could be applied to six-membered SAs such as sulfadimethoxine. It has been found that the dissociation of SN bond is easier in direct photolysis than ·OH-mediated indirect photolysis. Wiberg bond index and LUMO-HOMO energy gap are investigated to clarify the origin of the discrepant reactivity of sulfonamide moiety of SAs at singlet and triplet states. In comparison with singlet states, the SN bond of SAs is weaker at triplet states of SAs and thus results in higher reactivity of sulfonamide moiety, as also suggested by smaller LUMO-HOMO energy gap. This study could add better understanding to the photolysis mechanisms of SAs, which would be also helpful in utilizing quantum chemistry calculation to investigate the behavior and fate of antibiotics in the aquatic environment.
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Affiliation(s)
- Pu Ge
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China
| | - Hang Yu
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China
| | - Jingwen Chen
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China
| | - Jingping Qu
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China
| | - Yi Luo
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China.
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597
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Secondary battery inspired α-nickel hydroxide as an efficient Ni-based heterogeneous catalyst for sulfate radical activation. Sci Bull (Beijing) 2018; 63:278-281. [PMID: 36658796 DOI: 10.1016/j.scib.2018.02.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 01/14/2018] [Accepted: 01/18/2018] [Indexed: 01/21/2023]
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598
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Zhang Q, Chen S, Wang H, Yu H. Exquisite Enzyme-Fenton Biomimetic Catalysts for Hydroxyl Radical Production by Mimicking an Enzyme Cascade. ACS APPLIED MATERIALS & INTERFACES 2018; 10:8666-8675. [PMID: 29457453 DOI: 10.1021/acsami.7b18690] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Hydrogen peroxide (H2O2) is a key reactant in the Fenton process. As a byproduct of enzymatic reaction, H2O2 can be obtained via catalytical oxidation of glucose using glucose oxidase in the presence of O2. Another oxidation product (gluconic acid) can suitably adjust the microenvironmental pH contributing to the Fe3+/Fe2+ cycle in the Fenton reaction. Enzymes are extremely efficient at catalyzing a variety of reactions with high catalytic activity, substrate specificity, and yields in living organisms. Inspired by the multiple functions of natural multienzyme systems, an exquisite nanozyme-modified α-FeOOH/porous carbon (PC) biomimetic catalyst constructed by in situ growth of glucose oxidase-mimicking Au nanoparticles and crystallization of adsorbed ferric ions within carboxyl into hierarchically PC is developed as an efficient enzyme-Fenton catalyst. The products (H2O2, ∼4.07 mmol·L-1) of the first enzymatic reaction are immediately used as substrates for the second Fenton-like reaction to generate the valuable •OH (∼96.84 μmol·L-1), thus mimicking an enzyme cascade pathway. α-FeOOH nanocrystals, attached by C-O-Fe bondings, are encapsulated into the mesoporous PC frameworks, facilitating the electron transfer between α-FeOOH and the PC support and greatly suppressing iron leaching. This study paves a new avenue for designing biomimetic enzyme-based Fenton catalysts mimicking a natural system for •OH production.
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Affiliation(s)
- Qi Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , China
| | - Shuo Chen
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , China
| | - Hua Wang
- School of Fisheries and Life Science , Dalian Ocean University , Dalian 116023 , China
| | - Hongtao Yu
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology , Dalian University of Technology , Dalian 116024 , China
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599
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Salminen K, Grönroos P, Härmä H, Kulmala S. Hot electron-induced electrochemiluminescence of calcein and calcein-Tb(III) complex at disposable oxide-covered aluminum and polyvinyl butyral-carbon black/metal composite electrodes in aqueous solutions. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.02.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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600
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Ulliman SL, McKay G, Rosario-Ortiz FL, Linden KG. Low levels of iron enhance UV/H 2O 2 efficiency at neutral pH. WATER RESEARCH 2018; 130:234-242. [PMID: 29227872 DOI: 10.1016/j.watres.2017.11.041] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 11/16/2017] [Accepted: 11/18/2017] [Indexed: 05/26/2023]
Abstract
While the presence of iron is generally not seen as favorable for UV-based treatment systems due to lamp fouling and decreased UV transmittance, we show that low levels of iron can lead to improvements in the abatement of chemicals in the UV-hydrogen peroxide advanced oxidation process. The oxidation potential of an iron-assisted UV/H2O2 (UV254 + H2O2 + iron) process was evaluated at neutral pH using iron levels below USEPA secondary drinking water standards (<0.3 mg/L). Para-chlorobenzoic acid (pCBA) was used as a hydroxyl radical (HO) probe to quantify HO steady state concentrations. Compounds degraded by different mechanisms including, carbamazepine (CBZ, HO oxidation) and N-nitrosodimethylamine (NDMA, direct photolysis), were used to investigate the effect of iron on compound degradation for UV/H2O2 systems. The effects of iron species (Fe2+ and Fe3+), iron concentration (0-0.3 mg/L), H2O2 concentration (0-10 mg/L) and background water matrix (low-carbon tap (LCT) and well water) on HO production and compound removal were examined. Iron-assisted UV/H2O2 efficiency was most influenced by the target chemical and the water matrix. Added iron to UV/H2O2 was shown to increase the steady-state HO concentration by approximately 25% in all well water scenarios. While CBZ removal was unchanged by iron addition, 0.3 mg/L iron improved NDMA removal rates in both LCT and well water matrices by 15.1% and 4.6% respectively. Furthermore, the combination of UV/Fe without H2O2 was also shown to enhance NDMA removal when compared to UV photolysis alone indicating the presence of degradation pathways other than HO oxidation.
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Affiliation(s)
- Sydney L Ulliman
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 4001 Discovery Drive, Boulder, CO 80303, USA
| | - Garrett McKay
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 4001 Discovery Drive, Boulder, CO 80303, USA
| | - Fernando L Rosario-Ortiz
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 4001 Discovery Drive, Boulder, CO 80303, USA
| | - Karl G Linden
- Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 4001 Discovery Drive, Boulder, CO 80303, USA.
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