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Xiang W, Xu F, Wan D, Wang X, Luo F, Chen Y. Mechanistic investigation of direct photodegradation of chloroquine phosphate under simulated sunlight. CHEMOSPHERE 2023; 335:139093. [PMID: 37268224 DOI: 10.1016/j.chemosphere.2023.139093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 05/19/2023] [Accepted: 05/30/2023] [Indexed: 06/04/2023]
Abstract
Chloroquine phosphate (CQ) is an antiviral drug for Coronavirus Disease 2019 and an old drug for treatment of malaria, which has been detected in natural waters. Despite its prevalence, the environmental fate of CQ remains unclear. In this study, the direct photodegradation of CQ under simulated sunlight was investigated. The effect of various parameters such as pH, initial concentration and environmental matrix were examined. The photodegradation quantum yield of CQ (4.5 × 10-5-0.025) increased with the increasing pH value in the range of 6.0-10.0. The electron spin resonance (ESR) spectrometry and quenching experiments verified that the direct photodegradation of CQ was primarily associated with excited triplet states of CQ (3CQ*). The common ions had negligible effect and humic substances exhibited a negative effect on CQ photodegradation. The photoproducts were identified using high-resolution mass spectrometry and the photodegradation pathway of CQ was proposed. The direct photodegradation of CQ involved the cleavage of the C-Cl bond and substitution of the hydroxyl group, followed by further oxidation to yield carboxylic products. The photodegradation processes were further confirmed by the density functional theory (DFT) computation for the energy barrier of CQ dichlorination. The findings contribute to the assessment of the ecological risk associated with the overuse of Coronavirus drugs during global public health emergencies.
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Affiliation(s)
- Weiming Xiang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China
| | - Fahao Xu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China
| | - Dong Wan
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, PR China
| | - Xing Wang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China
| | - Fan Luo
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China.
| | - Yong Chen
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China.
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Fan X, Xie Y, Qian S, Xiang Y, Chen Q, Yang Y, Liu J, Zhang J, Hou J. Insights into the characteristics, adsorption and desorption behaviors of microplastics aged with or without fulvic acid. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:10484-10494. [PMID: 36076135 DOI: 10.1007/s11356-022-22897-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 09/01/2022] [Indexed: 06/15/2023]
Abstract
Many aging experiments on microplastics (MPs) have been carried out using UV radiation or strong oxidants. Little attention has been paid to the role of water environmental factors such as dissolved organic matter (DOM). In this study, the role of fulvic acid (FA), the main component of DOM, in the UV-aging process of MPs was explored. MPs aged under UV, and UV along with 0.5 mg/L and 2 mg/L FA, were selected as subjects. The results showed that (1) FA accelerated the aging process of polyethylene (PE). PE aged with FA had a larger specific area (SBET), with more holes and cracks on the surface. (2) FA enhanced the adsorption capacity of PE. The TC adsorption quantities of 0, 0.5, and 2 mg/L FA-aged PE were 1.100, 1.447, and 1.812 mg/L, respectively. (3) The quantity of TC desorbed by PE increased, whereas the desorption rate decreased as the FA concentration increased. The desorption rates of TC at 0, 0.5, and 2 mg/L FA-aged PE were 25.16%, 22.05%, and 19.52% in water, and 72.10%, 70.36%, and 59.51% in simulated intestinal fluid. This study explored the role of FA in the aging process of MPs. Moreover, research on the aging mechanism of MPs is enriched.
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Affiliation(s)
- Xiulei Fan
- School of Environmental Engineering, Xuzhou University of Technology, Xuzhou, 221018, China.
- College of Environment, Hohai University, Nanjing, 210098, China.
- Suzhou Litree Ultra-Filtration Membrane Technology Co., Ltd, Suzhou, 215000, China.
| | - Ya Xie
- School of Environmental Engineering, Xuzhou University of Technology, Xuzhou, 221018, China
| | - Shenwen Qian
- School of Environmental Engineering, Xuzhou University of Technology, Xuzhou, 221018, China
| | - Yuan Xiang
- School of Environmental Engineering, Xuzhou University of Technology, Xuzhou, 221018, China
| | - Qing Chen
- Suzhou Litree Ultra-Filtration Membrane Technology Co., Ltd, Suzhou, 215000, China
| | - YangYang Yang
- School of Environmental Engineering, Xuzhou University of Technology, Xuzhou, 221018, China
| | - Jiaqiang Liu
- School of Environmental Engineering, Xuzhou University of Technology, Xuzhou, 221018, China
| | - Jiankun Zhang
- School of Environmental Engineering, Xuzhou University of Technology, Xuzhou, 221018, China
| | - Jun Hou
- College of Environment, Hohai University, Nanjing, 210098, China
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Wan D, Wang J, Chen T, Xiang W, Selvinsimpson S, Chen Y. Effect of disinfection on the photoreactivity of effluent organic matter and photodegradation of organic contaminants. WATER RESEARCH 2022; 219:118552. [PMID: 35550969 DOI: 10.1016/j.watres.2022.118552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Revised: 04/28/2022] [Accepted: 05/03/2022] [Indexed: 06/15/2023]
Abstract
Chlorine, UV254, and ozone are three typical processes commonly used for wastewater disinfection, which could change the photoreactivity of dissolved organic matter (DOM) in effluents of wastewater treatment plants (WWTPs). The photoinduced reactive species (RS) from DOM, primarily including the excited triplet state of DOM (3DOM*), singlet oxygen (1O2), and hydroxyl radical (•OH), play important roles in the attenuation of contaminants. However, the effect of disinfection processes on the photosensitized degradation of contaminants is poorly understood. This paper presents the first evidence that 3DOM*, 1O2, and •OH interaction with three typical contaminants (diphenhydramine, cimetidine, and N,N-diethyl-m-toluamide (DEET)) was largely impacted by DOM after disinfection. The results of electron spin resonance (ESR) spectrometry and laser flash photolysis (LFP) experiments demonstrated that the chlorination increased the formation rate of 3DOM* and 1O2, while UV254 irradiation and ozonation decreased the formation rate of these RS. All these three disinfection processes promoted the photoproduction of •OH and increased the photodegradation rate constants (kobs) of DEET by 26-361%. The kobs of diphenhydramine, cimetidine, and DEET correlated positively with the formation rate of 3DOM*, 1O2, and •OH, respectively. The bimolecular reaction rate constant of 3DOM* with diphenhydramine increased by ∼41% after chlorination. These findings suggest that disinfection processes altered the photogeneration of RS from DOM, which significantly impacts the fate of trace pollutants in aquatic environments.
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Affiliation(s)
- Dong Wan
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Jie Wang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Tong Chen
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - Weiming Xiang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | | | - Yong Chen
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
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Guo Y, Guo Z, Zhang L, Yoshimura C, Ye Z, Yu P, Qian Y, Hatano Y, Wang J, Niu J. Photodegradation of propranolol in surface waters: An important role of carbonate radical and enhancing toxicity phenomenon. CHEMOSPHERE 2022; 297:134106. [PMID: 35227754 DOI: 10.1016/j.chemosphere.2022.134106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 02/10/2022] [Accepted: 02/23/2022] [Indexed: 06/14/2023]
Abstract
Antihypertensive propranolol (PRO) is frequently detected in surface waters and has adverse effects on aquatic organisms. In this study, its photochemical fate in surface water with the aspect of kinetics, products and toxicity were investigated employing steady-state photochemistry experiments and ecotoxicity tests. The results showed that photodegradation of PRO was enhanced in river water than that in phosphate buffer where dissolved organic matter (DOM), NO3-, and HCO3- played important roles. DOM accelerated the photodegradation mainly through generation of excited triplet-state DOM while NO3- played dual roles in the photodegradation. The reaction between excited triplet-state PRO and HCO3- can generate carbonate radical (CO3·-) to promote the photodegradation. The second-order reaction rate constant between PRO and CO3·- was determined to be (3.4 ± 0.8) × 108 M-1 s-1. Eight photodegradation products were identified in the studied river water sample. Finally, the toxicity evaluated by Vibrio fischeri increased after photodegradation and three photodegradation products were responsible for the increasing toxicity, which was concluded from the significant correlation between toxicity parameters and quantity of the photodegradation products.
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Affiliation(s)
- Yuchen Guo
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, China
| | - Zhongyu Guo
- Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152-8552, Japan
| | - Lilan Zhang
- Key Laboratory of Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Chihiro Yoshimura
- Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152-8552, Japan
| | - Zimi Ye
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, China
| | - Pengfei Yu
- Key Laboratory of Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Yao Qian
- Key Laboratory of Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Yuta Hatano
- Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152-8552, Japan
| | - Jieqiong Wang
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, China.
| | - Junfeng Niu
- School of Water Resources and Hydropower Engineering, North China Electric Power University, Beijing, 102206, China
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Kovács K, Tóth T, Wojnárovits L. Evaluation of advanced oxidation processes for β-blockers degradation: a review. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2022; 85:685-705. [PMID: 35100147 DOI: 10.2166/wst.2021.631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
This study summarizes the results of scientific investigations on the removal of the three most often used β-blockers (atenolol, metoprolol and propranolol) by various advanced oxidation processes (AOP). The free radical chemistry, rate constants, degradation mechanism and elimination effectiveness of these compounds are discussed together with the technical details of experiments. In most AOP the degradation is predominantly initiated by hydroxyl radicals. In sulfate radical anion-based oxidation processes (SROP) both hydroxyl radicals and sulfate radical anions greatly contribute to the degradation. The rate constants of reactions with these two radicals are in the 109-1010 M-1 s-1 range. The degradation products reflect ipso attack, hydroxylation on the aromatic ring and/or the amino moiety and cleavage of the side chain. Among AOP, photocatalysis and SROP are the most effective for degradation of the three β-blockers. The operating parameters have to be optimized to the most suitable effectiveness.
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Affiliation(s)
- Krisztina Kovács
- Institute for Energy Security and Environmental Safety, Centre for Energy Research, Konkoly-Thege Miklós út 29-33, H-1121, Budapest, Hungary E-mail:
| | - Tünde Tóth
- Institute for Energy Security and Environmental Safety, Centre for Energy Research, Konkoly-Thege Miklós út 29-33, H-1121, Budapest, Hungary E-mail: ; Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111, Budapest, Hungary
| | - László Wojnárovits
- Institute for Energy Security and Environmental Safety, Centre for Energy Research, Konkoly-Thege Miklós út 29-33, H-1121, Budapest, Hungary E-mail:
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Wang Y, Gong X, Dong X. Photo-oxidation of arsenite in acidic waters containing Suwannee River fulvic acid: roles of 3SRFA* and hydroxyl radical. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:45144-45154. [PMID: 33864218 DOI: 10.1007/s11356-021-13900-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Accepted: 04/07/2021] [Indexed: 06/12/2023]
Abstract
The photo-oxidation of arsenite (As(III)) in solution containing Suwannee River fulvic acid (SRFA) under the ultraviolet A (UVA) irradiation (λmax = 365 nm) was studied. In a solution containing 100.0 μg·L-1 As(III) and 10.0 mg·L-1 SRFA at pH 3.0, SRFA induced As(III) photo-oxidation by producing the triplet excited state of SRFA (3SRFA*) and hydroxyl radical(HO˙). Approximately 82% of As(III) oxidation was attributed to HO˙ which depended strongly on HO2˙/O2˙-. The remaining 18% of As(III) oxidation was attributed to the direct reaction between As(III) and 3SRFA*. The photo-oxidation of As(III) was significantly affected by solution pH. Excess SRFA inhibited As(III) photo-oxidation. The addition of a low concentration of ferric ions retarded the photo-oxidation of As(III) due to the poor photo-activity of Fe(III)-SRFA complexes. In contrast, the addition of ferric ions at high concentration greatly accelerated As(III) photo-oxidation because of the high photo-activity of Fe(III)-OH complexes. The fractions of SRFA with different molecular weight showed different oxidizing capacities under UV irradiation which was possibly related to the different contents of phenolic OH groups. The findings have important environmental implications for the photo-transformation behavior of As(III) in natural surface waters containing dissolved organic matter, especially acidic waters.
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Affiliation(s)
- Yajie Wang
- School of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang, 550025, People's Republic of China.
| | - Xianhe Gong
- School of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang, 550025, People's Republic of China
| | - Xin Dong
- School of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang, 550025, People's Republic of China
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Wang J, Wang K, Guo Y, Ye Z, Guo Z, Lei Y, Yang X, Zhang L, Niu J. Dichlorine radicals (Cl 2•-) promote the photodegradation of propranolol in estuarine and coastal waters. JOURNAL OF HAZARDOUS MATERIALS 2021; 414:125536. [PMID: 33667804 DOI: 10.1016/j.jhazmat.2021.125536] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Revised: 02/20/2021] [Accepted: 02/23/2021] [Indexed: 06/12/2023]
Abstract
Propranolol (PRO) is frequently detected in estuarine and coastal waters, which has adverse effects on estuarine and coastal ecosystems. In this study, the effects of halide ions and DOM from estuarine and coastal waters on the photochemical transformation of PRO were investigated. The results demonstrated that the presence of Br- alone exhibited slight effect on photochemical transformation of PRO, while photodegradation rates of PRO increased with the addition of 0.1-0.54 M Cl-. The quenching experiments and the laser flash photolysis experiments together demonstrated the generation of Cl2•- in the photolytic systems. Cl2•- is possibly produced through the charge separation of exciplex of 3PRO* and Cl- rather than via direct oxidation of Cl-. Additional experiments indicated that addition of seawater DOM inhibited the halide ions-sensitized photodegradation rates of PRO, which may be due to the quenching of Cl2•- by phenolic substances in DOM molecules. Compared with pure water, three new photochemical intermediates were identified in the presence of DOM or Cl-. The direct photolysis of PRO mainly reacted by hydroxyl additions, hydroxyl elimination and de-propylation, whereas electron transfer coupled with H-abstraction by Cl2•- and 3DOM* was proposed as the primary role for PRO degradation in the presence of Cl- or DOM.
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Affiliation(s)
- Jieqiong Wang
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Kai Wang
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Yuchen Guo
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Zimi Ye
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Zhongyu Guo
- Department of Civil and Environmental Engineering, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan
| | - Yu Lei
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Xin Yang
- School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
| | - Lilan Zhang
- Key Laboratory of Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Chongqing University, Chongqing 400045, China.
| | - Junfeng Niu
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan 523808, China
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Wan D, Wang J, Dionysiou DD, Kong Y, Yao W, Selvinsimpson S, Chen Y. Photogeneration of Reactive Species from Biochar-Derived Dissolved Black Carbon for the Degradation of Amine and Phenolic Pollutants. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:8866-8876. [PMID: 34165300 DOI: 10.1021/acs.est.1c01942] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Due to agricultural waste combustion and large-scale biochar application, biochar-derived dissolved black carbon (DBC) is largely released into surface waters. The photogeneration of reactive species (RS) from DBC plays an important role in organic pollutant degradation. However, the mechanistic interactions between RS and pollutants are poorly understood. Here, we investigated the formation of DBC triplet states (3DBC*), singlet oxygen (1O2), and hydroxyl radical (•OH) in straw biochar-derived DBC solutions and photodegradation of typical pharmaceuticals and personal care products (PPCPs). Laser flash photolysis and electron spin resonance spectrometry showed that DBC exhibited higher RS quantum yields than some well-studied dissolved organic matter. The RS caused rapid degradation of atenolol, diphenhydramine, and propylparaben, selected as target PPCPs in this study. The 3DBC* contributed primarily to the oxidation of selected PPCPs via one-electron-transfer interaction, with average reaction rate constants of 1.15 × 109, 1.41 × 109, and 0.51 × 109 M-1 s-1, respectively. •OH also participated in the degradation and accounted for approximately 2.7, 2.5, and 18.0% of the total removal of atenolol, diphenhydramine, and propylparaben, respectively. Moreover, the photodegradation products were identified using high-resolution mass spectrometry, which further confirmed the electron transfer and •OH oxidation mechanisms. These findings suggest that DBC from the combustion process of agricultural biomass can efficiently induce the photodegradation of organic pollutants under sunlight in aquatic environments.
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Affiliation(s)
- Dong Wan
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Jie Wang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Dionysios D Dionysiou
- Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Yaqian Kong
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Wanying Yao
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | | | - Yong Chen
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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10
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Pozdnyakov IP, Tyutereva YE, Parkhats MV, Grivin VP, Fang Y, Liu L, Wan D, Luo F, Chen Y. Mechanistic investigation of humic substances assisted photodegradation of imipramine under simulated sunlight. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 738:140298. [PMID: 32806347 DOI: 10.1016/j.scitotenv.2020.140298] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 06/07/2020] [Accepted: 06/15/2020] [Indexed: 06/11/2023]
Abstract
Imipramine (IMI) is a frequently prescribed tricyclic antidepressant and widely detected in the natural waters, while the environmental fate of IMI is yet poorly understood. Here, we investigated the photodegradation of IMI under simulated sunlight in the presence of humic substances (HS), typically including humic acid (HA) and fulvic acid (FA). The direct and indirect IMI photodegradation was found to increase both with increasing pH and with deoxygenation of the reaction solutions. The excited triplet state of HS (3HS⁎) was mainly responsible for the photosensitized degradation of IMI according to the steady-state quenching and direct time-resolved experiments. The electron transfer interaction between 3HS⁎ and IMI was observed by laser flash photolysis (LFP) with bimolecular reaction rate constants of (4.9 ± 0.4) × 109 M-1 s-1. Evidence of electron transfer from IMI to 3HS⁎ was further demonstrated by the photoproduct analysis. The indirect photodegradation was triggered off in the side chain of IMI with the nonbonding nitrogen electron transferring to 3HS⁎, followed by hydroxylation, demethylation and cleavage of the side chain. Very important that HS photosystem does not lose its efficiency with decreasing of IMI concentration, meaning that the studied photosystem still be used at environmentally relevant concentrations of IMI. These results suggest that photodegradation could be an important attenuation pathway for IMI in HS-rich and anaerobic natural waters.
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Affiliation(s)
- Ivan P Pozdnyakov
- Novosibirsk State University, 630090 Novosibirsk, Russian Federation; Voevodsky Institute of Chemical Kinetics and Combustion, 630090 Novosibirsk, Russian Federation
| | - Yuliya E Tyutereva
- Novosibirsk State University, 630090 Novosibirsk, Russian Federation; Voevodsky Institute of Chemical Kinetics and Combustion, 630090 Novosibirsk, Russian Federation
| | - Marina V Parkhats
- B.I. Stepanov Institute of Physics National Academy of Sciences of Belarus, 220072 Minsk, Belarus
| | - Vyacheslav P Grivin
- Novosibirsk State University, 630090 Novosibirsk, Russian Federation; Voevodsky Institute of Chemical Kinetics and Combustion, 630090 Novosibirsk, Russian Federation
| | - Yuan Fang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China
| | - Lu Liu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China
| | - Dong Wan
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China
| | - Fan Luo
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China
| | - Yong Chen
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China.
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11
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Wan D, Wang H, Pozdnyakov IP, Wang C, Su J, Zhang Y, Zuo Y, Dionysiou DD, Chen Y. Formation and enhanced photodegradation of chlorinated derivatives of bisphenol A in wastewater treatment plant effluent. WATER RESEARCH 2020; 184:116002. [PMID: 32682078 DOI: 10.1016/j.watres.2020.116002] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2020] [Revised: 05/28/2020] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
There are many reports on the detection and removal of emerging pollutants in the wastewater effluents, while the fate of their chlorinated derivatives generated during chlorination is not well understood. Here we investigated the photodegradation of chlorinated derivatives of bisphenol A (CDBPAs), mainly including 3-chlorobisphenol A, 3,3'-dichlorobisphenol A, 3,5-dichlorobisphenol A, 3,3',5-trichlorobisphenol A, and 3,3',5,5'-tetrachlorobisphenol A, under simulated sunlight. Distinct from BPA, CDBPAs underwent rapid direct photodegradation due to a pronounced bathochromic shift of UV absorption. The photodegradation of CDBPAs was significantly enhanced by effluent organic matter (EfOM) from the wastewater effluent. A series of quenching experiments and laser flash photolysis analysis verified the contribution of triplet states of EfOM (3EfOM∗) for the indirect photodegradation of CDBPAs with rate constant of ∼109 M-1 s-1. Both direct and EfOM-induced indirect photodegradation of CDBPAs increased with a higher degree of chlorination. Furthermore, high-resolution mass spectrometry showed similar photoproducts for direct and indirect photodegradation of CDBPAs, mainly ascribed to the cleavage of C-Cl bond and hydroxylation with further cleavage of the benzene ring. The estrogenic activity of the photoproducts was diminished. These findings suggest that photodegradation is an important pathway for the removal and detoxication of CDBPAs from effluents and receiving natural waters under sunlight.
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Affiliation(s)
- Dong Wan
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, People's Republic of China
| | - Haiyan Wang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, People's Republic of China
| | - Ivan P Pozdnyakov
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya str, Novosibirsk, 630090, Russian Federation
| | - Chengjun Wang
- College of Resources and Environmental, South-Central University for Nationalities, Wuhan, 430074, People's Republic of China
| | - Jing Su
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, People's Republic of China
| | - Yanrong Zhang
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, People's Republic of China
| | - Yuegang Zuo
- University of Massachusetts Dartmouth, 285 Old Westport Road, North Dartmouth, MA, 02747-2300, United States
| | - Dionysios D Dionysiou
- Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH, 45221-0012, United States
| | - Yong Chen
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, People's Republic of China.
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Mordvinova ED, Snytnikova OA, Salomatova VA, Yanshole VV, Grivin VP, Pozdnyakov IP. Direct UVC photodegradation of imipramine in aqueous solutions: a mechanistic study. MENDELEEV COMMUNICATIONS 2020. [DOI: 10.1016/j.mencom.2020.09.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Jiao X, Li Z, He J, Wang C. Enhanced photodegradation of applied dithianon fungicides on plant leaves by dissolved substances in atmosphere under simulated sunlight. CHEMOSPHERE 2020; 254:126807. [PMID: 32334257 DOI: 10.1016/j.chemosphere.2020.126807] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 04/06/2020] [Accepted: 04/13/2020] [Indexed: 06/11/2023]
Abstract
Photolysis of pesticides has been widely investigated for evaluating their environmental behavior and agricultural effectiveness after crop spraying. However, little information about the effects of the water-soluble substances in atmosphere on photodegradation of pesticides is available. In current study, we found that photolysis of applied dithianon fungicides on real plant leaves was much faster than that in sealed stock aqueous suspensions under simulated sunlight. To simulate the natural conditions, for the first time, photodegradation of dithianon in air-saturated solutions containing typical dissolved atmospheric substances (DAS) including CO2 (HCO3-/CO32-), NO2 (NO3-), Fe3+ (Fe3+-complexes), and humic-like substances (HULIS) exposed to simulated solar irradiations were carried out in lab-scale. Fulvic acid (FA) was used as a surrogate for atmospheric HULIS in this study. The dithianon photodegradation was significantly enhanced in the presence of DAS and the photo-generated reactive species such as ·OH, 1O2, CO3·- and 3FA∗ play important roles according to the results of reactive species quenching, electron spin resonance spectroscopy, and laser flash photolysis experiments. Moreover, the photodegraded intermediates and final products of dithianon on plant leaves have been identified by HPLC-MS analysis, and its possible photodegradation pathways were proposed. This work indicated that, except for direct photolysis, indirect photosensitive degradation induced by the dissolved photo-active substances in atmosphere should be considered for evaluating the degradation of the applied pesticides on crops.
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Affiliation(s)
- Xiaoyu Jiao
- College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan, 430074, China
| | - Zhiling Li
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, China
| | - Jun He
- Department of Chemical and Environmental Engineering, University of Nottingham-Ningbo China, Ningbo, 315100, China
| | - Chengjun Wang
- College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan, 430074, China.
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14
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Lin W, Zhang X, Li P, Tan Y, Ren Y. Ultraviolet photolysis of metformin: mechanisms of environmental factors, identification of intermediates, and density functional theory calculations. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:17043-17053. [PMID: 32146661 DOI: 10.1007/s11356-020-08255-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 02/26/2020] [Indexed: 06/10/2023]
Abstract
As a commonly used anti-diabetic drug, metformin (MEF) is frequently detected in different water bodies which pose a potential threat to human health and the ecological environment. In this study, oxidative degradation of MEF under ultraviolet (UV) light was studied, and its influencing factors, photolysis mechanism, and intermediates identification carried out as well. The results showed that the hydroxyl radical contributed 73% during the 6 h MEF photolysis process among the reactive oxygen species (ROS). In addition, triplet excited-state organic matter and singlet oxygen also played a role in the photolysis process. The reaction rates of hydroxyl radical and singlet oxygen with MEF are (6.45 ± 0.4) × 109 and (5.4 ± 0.7) × 106 L·(mol s)-1, respectively. By calculating the light screening effect of environmental factors, it is found that the presence of NO3- and Cl- had a greater excitation effect on ROS than the screening effect, and generally promoted the photolysis rates of MEF from 90.3 to 193.5% and from 16.1 to 80.6% during the 6-h reaction process, respectively. For bicarbonate and fulvic acid, the light screening effects were dominant and inhibited photolysis rates by 10-52% and 13-71%, respectively. The results demonstrated that the photoreactivity of environmental factors in water is the cause of the different photodegradation rates of MEF. The oxidative degradation product of MEF under UV light was detected by UPLC/Q-TOF as methylbiguanide (MBG), 2,4-diamino-1,3,5-triazine (2,4-DAT), biguanide (BGN), 1,1-dimethylguanidine (1,1-DiMBG), 4-amino-2-imino-1-methyl-1,2-dihydro-1, 3,5-triazine (4,2,1-AIMT), and 2-amino-4-methylamino-1,3,5-triazine (2,4-AMT). The result which showed that the primary sites of ∙OH attacked is consistent with that of density functional theory calculation. Graphical abstract.
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Affiliation(s)
- Wenting Lin
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Panyu District, Guangzhou, 510006, People's Republic of China
| | - Xiaohan Zhang
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Panyu District, Guangzhou, 510006, People's Republic of China
| | - Ping Li
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Panyu District, Guangzhou, 510006, People's Republic of China
| | - Yongzhen Tan
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Panyu District, Guangzhou, 510006, People's Republic of China
| | - Yuan Ren
- School of Environment and Energy, South China University of Technology, Higher Education Mega Center, Panyu District, Guangzhou, 510006, People's Republic of China.
- The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, People's Republic of China.
- The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou, People's Republic of China.
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15
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Wang J, Wang K, Guo Y, Niu J. Photochemical degradation of nebivolol in different natural organic matter solutions under simulated sunlight irradiation: Kinetics, mechanism and degradation pathway. WATER RESEARCH 2020; 173:115524. [PMID: 32006808 DOI: 10.1016/j.watres.2020.115524] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 01/17/2020] [Accepted: 01/18/2020] [Indexed: 06/10/2023]
Abstract
Nebivolol (NEB) is widely used for the treatment of hypertension and chronic heart failure and has become an ubiquitous emerging organic pollutant. It has been shown to undergo direct photolysis, but the role of DOM in its degradation kinetics and mechanism is not well understood. In this study, we studied the photochemical behavior of NEB in the presence of seawater DOM (SW-DOM) and freshwater DOM (SRNOM) under simulated sunlight irradiation. SW-DOM had a promotion effect on NEB photodegradation, whereas SRNOM retarded its photolytic transformation. After eliminating the influence of light screening, we found that the indirect photodegradation rate of NEB in the presence of SRNOM was lower than that in the presence of SW-DOM. Results show that the indirect photodegradation pathway occurred by reaction with triplet-excited DOM (3DOM*). The second-order rate constants for 3SW-DOM* and 3SRNOM* reaction with NEB are 3.7 × 109 M-1 s-1 and 3.7 × 108 M-1 s-1, respectively. The electron donating capacity of SRNOM is higher than that of SW-DOM, indicating that SRNOM may contain more activated phenolic moieties. SRNOM may thus have higher antioxidant activity, leading a higher inhibitory effect on NEB photodegradation. A total of six degradation products were identified in the absence and presence of DOM by HPLC-ESI-MS/MS. The substitution of F by OH-groups and further oxidation a OH-group in the lateral chain to a ketone, and cleavage of N-C bond by the attack of 3DOM* are here proposed as the main degradation pathways.
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Affiliation(s)
- Jieqiong Wang
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, PR China
| | - Kai Wang
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, PR China
| | - Yuchen Guo
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, PR China
| | - Junfeng Niu
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, PR China.
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16
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Xu J, Kralles ZT, Hart CH, Dai N. Effects of Sunlight on the Formation Potential of Dichloroacetonitrile and Bromochloroacetonitrile from Wastewater Effluents. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:3245-3255. [PMID: 32068383 DOI: 10.1021/acs.est.9b06526] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Sunlight plays an important role in transforming effluent organic matter as wastewater effluents travel downstream, but the corresponding effects on the formation of haloacetonitriles (HANs), a group of toxic disinfection byproducts, in wastewater-impacted surface water have not been thoroughly investigated. In this study, we observed that sunlight preferentially attenuated the formation potential of bromochloroacetonitrile (BCAN-FP) over that of dichloroacetonitrile (DCAN-FP) in chlorine- and UV-disinfected secondary effluents. For four effluent samples from different plants, 36 h of irradiation by simulated sunlight removed 28-33% of DCAN-FP and 41-48% of BCAN-FP. Across a larger set of effluent samples (n = 18), 8 h of irradiation (equivalent to 2-3 d of natural sunlight) decreased the calculated cytotoxicity contributed by dihaloacetonitrile-FP in most samples. Similar behavior was observed for a mixture of wastewater and surface water (volume ratio 1:1). For UV-disinfected effluents, the higher the UV dose, the more likely was there a reduction in DCAN-FP and BCAN-FP in the subsequent sunlight irradiation. Experiments with model compounds showed that fulvic acid and UV photoproducts of tryptophan yield excited triplet-state organic matters during sunlight irradiation and play an important role in promoting the attenuation of HAN precursors.
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Affiliation(s)
- Jiale Xu
- Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Zachary T Kralles
- Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Christine H Hart
- Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Ning Dai
- Department of Civil, Structural and Environmental Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
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17
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Yu Q, Xiong X, He J, Zuo Y, Chen Y, Wang C. Photolysis of bis(2-ethylhexyl) phthalate in aqueous solutions at the presence of natural water photoreactive constituents under simulated sunlight irradiation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:26797-26806. [PMID: 31300990 DOI: 10.1007/s11356-019-05913-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Accepted: 07/03/2019] [Indexed: 06/10/2023]
Abstract
The photolysis of bis(2-ethylhexyl) phthalate (DEHP) under simulated sunlight in the presence of the natural water photoreactive constituents was investigated. The presence of nitrate or ferric ions facilitated the photodegradation of DEHP via oxidation by generation of •OH. The fulvic acids (FAs), at low concentrations, promoted the photolysis of DEHP via energy transfer from the photoreaction-generated 3FA*. However, the DEHP photolysis was inhibited with high concentrations of FAs since the excess FAs at the surface of solution could act as light screening agents to keep FAs in bulk solution from the light irradiation, further reducing the 3FA* generation. When low concentrations of FAs and chloride ions coexist, the reactive chloride species Cl• and Cl2•- could generate via energy transfer from 3FA* to chloride ions and react with DEHP to enhance its degradation. Furthermore, the direct and •OH-initiated DEHP photodegraded intermediates and end products were identified by HPLC-MS2 and its corresponding photolysis pathways were proposed.
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Affiliation(s)
- Qian Yu
- College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan, 430074, China
| | - Xiyao Xiong
- College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan, 430074, China
| | - Jun He
- Department of Chemical and Environmental Engineering, The University of Nottingham Ningbo China, Ningbo, 315100, China
| | - Yuegang Zuo
- Department of Chemistry and Biochemistry, University of Massachusetts Dartmouth, North Dartmouth, MA, 02747, USA
| | - Yong Chen
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Chengjun Wang
- College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan, 430074, China.
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18
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Intermolecular interactions between natural humic substances and tricyclic antidepressants. MENDELEEV COMMUNICATIONS 2019. [DOI: 10.1016/j.mencom.2019.07.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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19
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Wan D, Chen Y, Su J, Liu L, Zuo Y. Ultraviolet absorption redshift induced direct photodegradation of halogenated parabens under simulated sunlight. WATER RESEARCH 2018; 142:46-54. [PMID: 29859391 DOI: 10.1016/j.watres.2018.05.039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 05/19/2018] [Accepted: 05/22/2018] [Indexed: 06/08/2023]
Abstract
As disinfection by-products of parabens, halogenated parabens are frequently detected in aquatic environments and exhibit higher persistence and toxicity than parabens themselves. An interesting phenomenon was found that UV absorption redshift (∼45 nm) occurs after halogenation of parabens at circumneutral pH, leading to overlap with the spectrum of terrestrial sunlight. This work presents the first evidence on the direct photodegradation of seven chlorinated and brominated parabens under simulated sunlight. These halogenated parabens underwent rapid direct photodegradation, distinguished from the negligible degradation of the parent compounds. The photodegradation rate depended on their forms and substituents. The deprotonation of halogenated parabens facilitated the direct photodegradation. Brominated parabens exhibited higher degradation efficiency than chlorinated parabens, and mono-halogenated parabens had higher degradation than di-halogenated parabens. The pseudo-first-order rate constants (kobs) for brominated parabens (0.075-0.120 min-1) were approximately 7-fold higher than those of chlorinated parabens (0.011-0.017 min-1). A quantitative structure-activity relationship (QSAR) model suggested that the photodegradation was linearly correlated with the C-X bond energies, electronic and steric effects of halogen substituents. The photodegradation products were identified using QTOF-MS analyses and a degradation pathway was proposed. The yeast two-hybrid estrogenicity assay revealed that the estrogenic activities of the photoproducts were negligible. These findings are important for the removal of halogenated parabens and predictions of their fate and potential impacts in surface waters.
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Affiliation(s)
- Dong Wan
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Yong Chen
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - Jing Su
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Lu Liu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Yuegang Zuo
- University of Massachusetts Dartmouth, 285 Old Westport Road, North Dartmouth, MA 02747-2300, USA
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20
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Peng N, Wang K, Lin S, Wu L. Effects of inorganic ions on the photolysis of propranolol in FA solution. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:26069-26078. [PMID: 29968220 DOI: 10.1007/s11356-018-2585-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 06/18/2018] [Indexed: 06/08/2023]
Abstract
Photolysis of the widely used beta-blocker propranolol (PRO) was investigated in the presence of fulvic acid (FA) and inorganic ions under simulated solar irradiation. PRO undergoes direct photolysis proceeding mainly via degradation of the triplet excited state, 3PRO*. FA and inorganic ions inhibited photolysis of PRO in the order of FA > Fe3+ > Cl- > Ca2+ > Mg2+ > NO3- > K+. An antagonistic effect between FA and inorganic ions toward the suppression of PRO photolysis was exhibited. The binding behaviors of PRO, FA, and inorganic ions were examined through fluorescence quenching experiments, which showed that inorganic ions affected the binding between FA and PRO through competing for the binding sites of FA or PRO. The correlation analysis demonstrated a positive correlation between the binding constant (KOC) of FA-PRO and the inhibition rate of FA on PRO photolysis. The observed rate constants of photolysis (kobs) have opposite correlations with the concentration of singlet oxygen (1O2). These findings strongly suggest that inorganic ions decrease the inhibition effect of FA on PRO photolysis via restraining the complexation of FA-PRO and production of 1O2.
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Affiliation(s)
- Na Peng
- School of Chemistry and Environment, Jiaying University, Meizhou, 514015, China
| | - Kaifeng Wang
- School of Chemistry and Environment, Jiaying University, Meizhou, 514015, China.
| | - Siwu Lin
- School of Chemistry and Environment, Jiaying University, Meizhou, 514015, China
| | - Libin Wu
- School of Chemistry and Environment, Jiaying University, Meizhou, 514015, China
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21
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Pozdnyakov IP, Sherin PS, Salomatova VA, Parkhats MV, Grivin VP, Dzhagarov BM, Bazhin NM, Plyusnin VF. Photooxidation of herbicide amitrole in the presence of fulvic acid. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:20320-20327. [PMID: 28233210 DOI: 10.1007/s11356-017-8580-x] [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: 12/08/2016] [Accepted: 02/06/2017] [Indexed: 06/06/2023]
Abstract
Fulvic acid (Henan ChangSheng Corporation) photoinduced degradation of non-UVA-absorbing herbicide amitrole (3-amino-1,2,4-triazole, AMT) as a way for its removal from polluted water was investigated in details. It was shown that the main primary species generated by fulvic acid under UVA radiation, triplet state and hydrated electron, are not directly involved in the herbicide degradation. AMT decays in reactions with secondary intermediates, reactive oxygen species, formed in reactions of the primary ones with dissolved oxygen. Singlet oxygen is responsible for 80% of herbicide oxidation, and •OH and O2-• radicals-for the remaining 20% of AMT. It was found that quantum yield of AMT photodegradation (ϕ 365nm) decreases linearly from 2.2 × 10-3 to 1.2 × 10-3 with the increase of fulvic acid concentration from 1.1 to 30 mg L-1. On the contrary, the increase of AMT concentration from 0.8 to 25 mg L-1 leads to practically linear growth of ϕ 365nm value from 1.8 × 10-4 to 4 × 10-3. Thus, the fulvic acid exhibits a good potential as UVA photooxidizer of organic pollutants sensitive to the singlet oxygen (ϕ 532nm(1O2) = 0.025 at pH 6.5).
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Affiliation(s)
- Ivan P Pozdnyakov
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya str, Novosibirsk, Russian Federation, 630090.
- Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russian Federation, 630090.
| | - Peter S Sherin
- Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russian Federation, 630090
- International Tomography Center, 3a Institutskaya str, Novosibirsk, Russian Federation, 630090
| | - Victoria A Salomatova
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya str, Novosibirsk, Russian Federation, 630090
| | - Marina V Parkhats
- B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 220072, Minsk, Belarus
| | - Vjacheslav P Grivin
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya str, Novosibirsk, Russian Federation, 630090
- Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russian Federation, 630090
| | - Boris M Dzhagarov
- B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 220072, Minsk, Belarus
| | - Nikolai M Bazhin
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya str, Novosibirsk, Russian Federation, 630090
| | - Victor F Plyusnin
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya str, Novosibirsk, Russian Federation, 630090
- Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russian Federation, 630090
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22
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Chen Y, Lu X, Liu L, Wan D, Chen H, Zhou D, Sharma VK. Oxidation of β-blockers by birnessite: Kinetics, mechanism and effect of metal ions. CHEMOSPHERE 2018; 194:588-594. [PMID: 29241133 DOI: 10.1016/j.chemosphere.2017.12.015] [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: 09/26/2017] [Revised: 12/02/2017] [Accepted: 12/04/2017] [Indexed: 06/07/2023]
Abstract
Manganese dioxides are ubiquitous in natural waters, soils, and sediments and play an important role in oxidative transformation of organic pollutants. This work presents the kinetics of the oxidation of selected β-blockers, betaxolol, metoprolol, and atenolol by birnessite (δ-MnO2) as a function of concentration of the β-blocker, dosage of δ-MnO2, and solution pH. The values of pseudo-first-order rate constants (kobs) of β-blockers decreased in the order betaxolol > atenolol > metoprolol, which was positively correlated with their acid dissociation constants (Ka). Effect of series of metal ions (Fe3+, Cr3+, Al3+, Pb2+, Cu2+, Zn2+, Ni2+, Cd2+, Mg2+, and Ca2+) on the degradation of β-blockers by δ-MnO2 was systematically examined. All of these metal ions inhibited the oxidation reaction under the same constant ionic strength. The inhibition efficiency was positively correlated with the logarithm of stability constant of metal ions in aqueous solution (logKMeOH). By LC-ESI-MS/MS analyses, the oxidation of β-blockers primarily involved hydroxylation and cleavage of the parent molecules to the short branched chain compounds. An electron transfer mechanism for the oxidation of β-blockers by δ-MnO2 was proposed. The oxidation was initiated by the electron transfer from the nonbonding electrons on nitrogen (N-electrons) of β-blockers to δ-MnO2, followed by transformation of radical intermediates. These findings will help to understand the oxidation processes of β-blockers and predict the effect of metal ions on the removal of pollutants by δ-MnO2 in the environment.
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Affiliation(s)
- Yong Chen
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China.
| | - Xiye Lu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Lu Liu
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Dong Wan
- School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Huabin Chen
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Danna Zhou
- Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Virender K Sharma
- Program for the Environment and Sustainability, Department of Environmental and Occupational Health, School of Public Health, Texas A&M University, College Station, TX 77843, USA
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23
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Chen Y, Liang J, Liu L, Lu X, Deng J, Pozdnyakov IP, Zuo Y. Photosensitized Degradation of Amitriptyline and Its Active Metabolite Nortriptyline in Aqueous Fulvic Acid Solution. JOURNAL OF ENVIRONMENTAL QUALITY 2017; 46:1081-1087. [PMID: 28991969 DOI: 10.2134/jeq2017.05.0181] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Amitriptyline is a frequently prescribed tricyclic antidepressant. Although amitriptyline and its active metabolite, nortriptyline, have been widely detected in natural waters, their environmental fate due to photodegradation is poorly understood. Here we describe a study conducted to investigate the photodegradation of amitriptyline and its active metabolite under simulated sunlight. Neither amitriptyline nor nortriptyline underwent direct photodegradation, but rapid photosensitized degradation did occur in fulvic acid (FA) solutions. The photodegradation of amitriptyline and nortriptyline followed pseudo-first-order kinetics with rate constants 0.24 and 0.16 h, respectively, at pH 8.0 in air-saturated FA solutions. The photodegradation of the substrates increased markedly with pH. The deprotonation of amitriptyline and nortriptyline facilitated the availability of nonbonding electrons on nitrogen (N-electrons). The excited triplet state of FA (FA*) was verified as the main reactive species responsible for the photosensitized degradation. An electron transfer mechanism for the interaction between substrates and FA* was proposed on the basis of a series of quenching experiments, kinetic model and photoproducts determination. Demethylation at the α-carbon of amine and hydroxylation were two primary photochemical processes initiated by the electron transfer reaction in the air-saturated FA solution; these were followed by generation of demethyl amine and mono-hydroxylation isomers. Our results suggest that indirect photodegradation is an important elimination process for amitriptyline and its active metabolite in natural waters.
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24
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Pozdnyakov IP, Romanova TE, Cai X, Salomatova VA, Plyusnin VF, Na P, Shuvaeva OV. Near-UV photooxidation of As(III) by iron species in the presence of fulvic acid. CHEMOSPHERE 2017; 181:337-342. [PMID: 28456035 DOI: 10.1016/j.chemosphere.2017.04.103] [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: 02/17/2017] [Revised: 04/05/2017] [Accepted: 04/23/2017] [Indexed: 06/07/2023]
Abstract
Photooxidation of As(III) in ternary As(III) - Fe(III) - Fulvic acid system at pH 4 was investigated by optical spectroscopy, steady-state photolysis (365 nm) and atomic-emission spectrometry with inductively coupled plasma techniques. It was found that at all values of [FA]/[Fe] ratio the main photoactive species is OH radical formed by photolysis of Fe(III) hydroxocomplexes. Addition of fulvic acid leads to mainly negative effect on As(III) photooxidation due to the following reasons: (i) slow dark reduction of photoactive Fe(III) species with formation of scattering particles and photoinert Fe(II) species; (ii) formation of photoreductive Fe(III)-FA complexes incapable to oxidize As(III), (iii) competition of both FA and Fe(III)-FA complexes for UVA quanta with FeOH2+ complex and for OH radicals with As(III). Aging of ternary system is also very important parameter leading to one order decrease of quantum yields of both Fe(II) formation and As(III) photooxidation.
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Affiliation(s)
- Ivan P Pozdnyakov
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya St., 630090 Novosibirsk, Russian Federation; Novosibirsk State University, 2 Pirogova St., 630090 Novosibirsk, Russian Federation.
| | - Tamara E Romanova
- Novosibirsk State University, 2 Pirogova St., 630090 Novosibirsk, Russian Federation; Nikolaev Institute of Inorganic Chemistry, 3 Acad. Lavrentiev Ave., 630090 Novosibirsk, Russian Federation
| | - Xiaojiao Cai
- Institute of Chemical Technology, Tianjin University, 92 Weijin Rd, 300072 Nankai, Tianjin, China
| | - Victoria A Salomatova
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya St., 630090 Novosibirsk, Russian Federation
| | - Victor F Plyusnin
- V.V. Voevodsky Institute of Chemical Kinetics and Combustion, 3 Institutskaya St., 630090 Novosibirsk, Russian Federation; Novosibirsk State University, 2 Pirogova St., 630090 Novosibirsk, Russian Federation
| | - Ping Na
- Institute of Chemical Technology, Tianjin University, 92 Weijin Rd, 300072 Nankai, Tianjin, China
| | - Olga V Shuvaeva
- Novosibirsk State University, 2 Pirogova St., 630090 Novosibirsk, Russian Federation; Nikolaev Institute of Inorganic Chemistry, 3 Acad. Lavrentiev Ave., 630090 Novosibirsk, Russian Federation
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25
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Ding W, Romanova TE, Pozdnyakov IP, Salomatova VA, Parkhats MV, Dzhagarov BM, Glebov EM, Wu F, Shuvaeva OV. Photooxidation of arsenic(III) in the presence of fulvic acid. MENDELEEV COMMUNICATIONS 2016. [DOI: 10.1016/j.mencom.2016.05.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Henriet T, Secrétan PH, Amrani F, Sadou-Yayé H, Bernard M, Solgadi A, Yagoubi N, Do B. Phototransformation patterns of the antiplatelet drug tirofiban in aqueous solution, relevant to drug delivery and storage. NEW J CHEM 2016. [DOI: 10.1039/c5nj01826a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tirofiban in aqueous solution mostly photodegrades through photosensitized oxidation reactions and the photoproducts formed are not structurally alerting for genotoxicity.
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Affiliation(s)
- Théo Henriet
- Université Paris Sud
- UFR de Pharmacie
- Groupe Matériaux et Santé
- 92296 Châtenay-Malabry
- France
| | | | - Fatma Amrani
- Université Paris Sud
- UFR de Pharmacie
- Groupe Matériaux et Santé
- 92296 Châtenay-Malabry
- France
| | - Hassane Sadou-Yayé
- Université Paris Sud
- UFR de Pharmacie
- Groupe Matériaux et Santé
- 92296 Châtenay-Malabry
- France
| | - Mélisande Bernard
- Université Paris Sud
- UFR de Pharmacie
- Groupe Matériaux et Santé
- 92296 Châtenay-Malabry
- France
| | - Audrey Solgadi
- Université Paris-Sud
- UFR de Pharmacie
- SAMM – Service d'Analyse des Médicaments et Métabolites
- Institut d'Innovation Thérapeutique
- 92296 Châtenay-Malabry
| | - Najet Yagoubi
- Université Paris Sud
- UFR de Pharmacie
- Groupe Matériaux et Santé
- 92296 Châtenay-Malabry
- France
| | - Bernard Do
- Université Paris Sud
- UFR de Pharmacie
- Groupe Matériaux et Santé
- 92296 Châtenay-Malabry
- France
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27
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Ren D, Huang B, Bi T, Xiong D, Pan X. Effects of pH and dissolved oxygen on the photodegradation of 17α-ethynylestradiol in dissolved humic acid solution. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2016; 18:78-86. [PMID: 26611276 DOI: 10.1039/c5em00502g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
To probe the mechanisms responsible for pH and dissolved oxygen (DO) affecting the photodegradation of 17α-ethynylestradiol (EE2) in dissolved humic acid (HA) solution, EE2 aqueous solutions with pH values ranging from 3.0 to 11.0 and different DO conditions were irradiated by using a 300 W mercury lamp equipped with 290 nm light cutoff filters. In 5.0 mg L(-1) HA solutions (pH 8.0), EE2 was degraded at a rate of 0.0739 h(-1) which was about 4-fold faster than that in Milli-Q water. The degradation of EE2 was mainly caused by the oxidation of photogenerated reactive species (RS), and the contribution of direct photodegradation to EE2 degradation was always lower than 27%. Both the direct and indirect photodegradation of EE2 were closely dependent on the EE2 initial concentration, pH value and DO concentration. The photodegradation rate of EE2 decreased with increased initial concentration of EE2 due to the limitation of photon flux. With pH and DO increasing, the degradation rate of EE2 increased significantly due to the increase in the yields of excited EE2 and RS. Among the photogenerated RS, HO˙ and (3)HA* were determined to be the key contributors, and their global contribution to EE2 photodegradation was about 50%. Although HA could generate more (1)O2 than HO˙, the contribution of (1)O2 to EE2 degradation was lower than 13% due to its low reactivity towards EE2. This study could enlarge our knowledge on the photochemical behaviors of steroid estrogens in natural sunlit waters.
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Affiliation(s)
- Dong Ren
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China.
| | - Bin Huang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China.
| | - Tingting Bi
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China.
| | - Dan Xiong
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China.
| | - Xuejun Pan
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China.
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