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Yu Y, Pan L, Xiong H, Xie X, Zhang Q, Sun Q, Wang J, Liu D, Yuan B, Ding S. The Mechanism and Kinetics Model of Degradation of Dicarboxylic Acids by Hydroxyl Radicals under Atmospheric Conditions. J Phys Chem A 2022; 126:787-799. [PMID: 35100502 DOI: 10.1021/acs.jpca.2c00282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The atmospheric degradation mechanism of dicarboxylic acids (DCAs) initiated by hydroxyl radicals has been theoretically investigated at the DLPNO-CCSD(T)/def2-TZVP//BH&HLYP/6-311++G(d,p) level of theory. In the presence of O2, the degradation of DCAs by hydroxyl radicals takes place through a two-step mechanism: the α-H elimination and the degradation of the peroxyl radical intermediate. The latter degradation mechanism is easy to proceed for the exothermic process of radical recombination. Therefore, the degradation rate of DCAs is determined by an α-H elimination step, which is accelerated in the case of long carbon-chain DCAs with a lower energy barrier. Canonical variational transition state theory has been employed to estimate the rate constants of the H-elimination step of the DCA degradation reaction by hydroxyl radicals over the temperature range of 220-1000 K.
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Affiliation(s)
- Youqing Yu
- Green intelligence Environmental School, Yangtze Normal University, Chongqing 408100, China.,Chongqing Hyperspectral Remote Sensing Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China.,Chongqing Multiple-source Technology Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China
| | - Li Pan
- Chongqing Medical and Health school, Chongqing 408100, China
| | - Haihong Xiong
- Green intelligence Environmental School, Yangtze Normal University, Chongqing 408100, China
| | - Xiaohua Xie
- Green intelligence Environmental School, Yangtze Normal University, Chongqing 408100, China.,Chongqing Hyperspectral Remote Sensing Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China.,Chongqing Multiple-source Technology Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China
| | - Qinqin Zhang
- Green intelligence Environmental School, Yangtze Normal University, Chongqing 408100, China.,Chongqing Hyperspectral Remote Sensing Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China.,Chongqing Multiple-source Technology Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China
| | - Qiyao Sun
- Green intelligence Environmental School, Yangtze Normal University, Chongqing 408100, China.,Chongqing Hyperspectral Remote Sensing Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China.,Chongqing Multiple-source Technology Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China
| | - Jie Wang
- Green intelligence Environmental School, Yangtze Normal University, Chongqing 408100, China.,Chongqing Hyperspectral Remote Sensing Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China.,Chongqing Multiple-source Technology Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China
| | - Dongsheng Liu
- Green intelligence Environmental School, Yangtze Normal University, Chongqing 408100, China.,Chongqing Hyperspectral Remote Sensing Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China.,Chongqing Multiple-source Technology Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China
| | - Binfang Yuan
- Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China
| | - Shimin Ding
- Green intelligence Environmental School, Yangtze Normal University, Chongqing 408100, China.,Chongqing Hyperspectral Remote Sensing Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China.,Chongqing Multiple-source Technology Engineering Research Center for Ecological Environment Monitoring, Yangtze Normal University, Chongqing 408100, China
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Yeung CS, Tse HY, Lau CY, Guan J, Huang J, Phillips DL, Leu SY. Insights into unexpected photoisomerization from photooxidation of tribromoacetic acid in aqueous environment using ultrafast spectroscopy. JOURNAL OF HAZARDOUS MATERIALS 2021; 418:126214. [PMID: 34102359 DOI: 10.1016/j.jhazmat.2021.126214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 05/12/2021] [Accepted: 05/21/2021] [Indexed: 06/12/2023]
Abstract
Haloacetic acids are carcinogenic disinfection by-products (DPBs) and their photo-decomposition pathways, especially for those containing bromine and iodine, are not fully understood. In this study, femtosecond transient absorption (fs-TA) spectroscopy experiments were introduced for the first time to investigate the photochemistry of tribromoacetic acid. The fs-TA experiments showed that a photoisomerization intermediate species HOOCCBr2-Br (iso-TBAA) was formed within several picoseconds after the excitation of TBAA. The absorption wavelength of the iso-TBAA was supported by time-dependent density calculations. With the Second-order Møller-Plesset perturbation theory, the structures and thermodynamics of the OH-insertion reactions of iso-TBAA were elucidated when water molecules were involved in the reaction complex. The calculations also revealed that the isomer species were able to react with water with its reaction dynamics dramatically catalyzed by the hydrogen bonding network. The proposed water catalyzed OH-insertion/HBr elimination mechanism predicted three major photoproducts, namely, HBr, CO and CO2, which was consistent with the photolysis experiments with firstly reported CO formation rate and mass conversion yield as 0.096 min-1 and 0.75 ± 0.1 respectively. The spectroscopic technique, numerical tool and disclosed mechanisms provided insights on photodecomposition and subsequent reactions of polyhalo-DPBs contain heavy atom(s) (e.g., Br, I) with water, aliphatic alcohols or other nucleophiles.
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Affiliation(s)
- Chi Shun Yeung
- Department of Civil & Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong
| | - Ho-Yin Tse
- Department of Civil & Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong
| | - Chun Yin Lau
- Department of Civil & Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong
| | - Jianyu Guan
- Department of Civil & Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong
| | - Jinqing Huang
- Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong
| | - David Lee Phillips
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong.
| | - Shao-Yuan Leu
- Department of Civil & Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong.
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Zhang W, Du B. The gas-phase pyrolysis of methyl azidoformate in the absence and presence of water: a theoretical study. Mol Phys 2019. [DOI: 10.1080/00268976.2018.1490464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Weichao Zhang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, People’s Republic of China
| | - Benni Du
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, People’s Republic of China
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Salta Z, Papayannis DK, Kosmas AM. Computational study of the hydrogen bonding interactions in the [CH 2 XNO 2 ·H 2 O] clusters (X = H, F, Cl, Br, I). COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.05.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Li C, Chen J, Xie HB, Zhao Y, Xia D, Xu T, Li X, Qiao X. Effects of Atmospheric Water on ·OH-initiated Oxidation of Organophosphate Flame Retardants: A DFT Investigation on TCPP. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:5043-5051. [PMID: 28368609 DOI: 10.1021/acs.est.7b00347] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Tris(2-chloroisopropyl) phosphate (TCPP), a widely used organophosphate flame retardant, has been recognized as an important atmospheric pollutant. It is notable that TCPP has potential for long-range atmospheric transport. However, its atmospheric fate is unknown, restricting its environmental risk assessment. Herein we performed quantum chemical calculations to investigate the atmospheric transformation mechanisms and kinetics of TCPP initiated by ·OH in the presence of O2/NO/NO2, and the effects of ubiquitous water on these reactions. Results show the H-abstraction pathways are the most favorable for the titled reaction. The calculated gaseous rate constant and lifetime at 298 K are 1.7 × 10-10 cm3molecule-1 s-1 and 1.7 h, respectively. However, when considering atmospheric water, the corresponding lifetime is about 0.5-20.2 days. This study reveals for the first time that water has a negative role in the ·OH-initiated degradation of TCPP by modifying the stabilities of prereactive complexes and transition states via forming hydrogen bonds, which unveils one underlying mechanism for the observed persistence of TCPP in the atmosphere. Water also influences secondary reaction pathways of selected TCPP radicals formed from the primary H-abstraction. These results demonstrate the importance of water in the evaluation of the atmospheric fate of newly synthesized chemicals and emerging pollutants.
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Affiliation(s)
- Chao Li
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University , Changchun 130117, 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
| | - Hong-Bin Xie
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China
| | - Yuanhui Zhao
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University , Changchun 130117, China
| | - Deming Xia
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China
| | - Tong Xu
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China
| | - Xuehua Li
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China
| | - Xianliang Qiao
- Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology , Dalian 116024, China
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Kaur R, Vikas V. Exploring the role of a single water molecule in the tropospheric reaction of glycolaldehyde with an OH radical: a mechanistic and kinetics study. RSC Adv 2016. [DOI: 10.1039/c6ra01299j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This work reveals that though a single-water molecule decelerates the atmospheric reaction between the glycolaldehyde and OH radical, however, it facilitates the cis–trans interconversion along the hydrogen-abstraction pathways.
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Affiliation(s)
- Ramanpreet Kaur
- Quantum Chemistry Group
- Department of Chemistry & Centre of Advanced Studies in Chemistry
- Panjab University
- Chandigarh-160014
- India
| | - Vikas Vikas
- Quantum Chemistry Group
- Department of Chemistry & Centre of Advanced Studies in Chemistry
- Panjab University
- Chandigarh-160014
- India
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