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Degradation of roxarsone in UV-based advanced oxidation processes: A comparative study.
J Hazard Mater. 2020 Nov 12 [Online ahead of print]JH

Abstract

Organoarsenicals such as roxarsone (ROX) pose a great threat to the eco-environment and human health. Herein, the degradation of ROX via UV-based advanced oxidation processes (AOPs) including UV/hydrogen peroxide (UV/H2O2), UV/peroxydisulfate (UV/PDS), and UV/peroxymonosulfate (PMS) processes are comparatively investigated. The removal efficiency of ROX in the UV-based AOPs follows the order of UV/H2O2 >UV/PDS>UV/PMS at pH 7.0, while UV/PDS is the most effective process in reducing the total organic carbon (TOC). The second-order rate constants of ROX with hydroxyl radicals (•OH) and sulfate radicals (SO4•-) are determined to be (2.71 ± 0.27)× 109 and (7.68 ± 0.37)× 108 M-1s-1, respectively. The degradation of ROX obeys the pseudo-first-order kinetics model, and the apparent rate constants (k) linearly increase with increasing the oxidants dosage from 0.10 to 1.0 mM. The solution pH (5.0-11.0) exhibits a limited effect on the oxidation of ROX in UV/H2O2 and UV/PDS processes, but a great enhancement is observed at pH 11.0 in UV/PMS process. Humic acid and bicarbonate obviously suppress the photodegradation of ROX. In addition, arsenic in ROX is mainly converted to As(V) in the three UV-based AOPs. Overall, this study provides essential information for the degradation of ROX via the traditional UV-based AOPs.

Authors+Show Affiliations

Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, 200 Xiao Ling Wei, Nanjing 210094, China.Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, 200 Xiao Ling Wei, Nanjing 210094, China. Electronic address: Li_HC@njust.edu.cn.Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, 200 Xiao Ling Wei, Nanjing 210094, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

33223319

Citation

Chen, Lu, et al. "Degradation of Roxarsone in UV-based Advanced Oxidation Processes: a Comparative Study." Journal of Hazardous Materials, 2020, p. 124558.
Chen L, Li H, Qian J. Degradation of roxarsone in UV-based advanced oxidation processes: A comparative study. J Hazard Mater. 2020.
Chen, L., Li, H., & Qian, J. (2020). Degradation of roxarsone in UV-based advanced oxidation processes: A comparative study. Journal of Hazardous Materials, 124558. https://doi.org/10.1016/j.jhazmat.2020.124558
Chen L, Li H, Qian J. Degradation of Roxarsone in UV-based Advanced Oxidation Processes: a Comparative Study. J Hazard Mater. 2020 Nov 12;124558. PubMed PMID: 33223319.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Degradation of roxarsone in UV-based advanced oxidation processes: A comparative study. AU - Chen,Lu, AU - Li,Hongchao, AU - Qian,Jieshu, Y1 - 2020/11/12/ PY - 2020/08/07/received PY - 2020/11/08/revised PY - 2020/11/10/accepted PY - 2020/11/23/entrez PY - 2020/11/24/pubmed PY - 2020/11/24/medline KW - AOPs KW - Organoarsenicals KW - UV irradiation KW - Water treatment SP - 124558 EP - 124558 JF - Journal of hazardous materials JO - J Hazard Mater N2 - Organoarsenicals such as roxarsone (ROX) pose a great threat to the eco-environment and human health. Herein, the degradation of ROX via UV-based advanced oxidation processes (AOPs) including UV/hydrogen peroxide (UV/H2O2), UV/peroxydisulfate (UV/PDS), and UV/peroxymonosulfate (PMS) processes are comparatively investigated. The removal efficiency of ROX in the UV-based AOPs follows the order of UV/H2O2 >UV/PDS>UV/PMS at pH 7.0, while UV/PDS is the most effective process in reducing the total organic carbon (TOC). The second-order rate constants of ROX with hydroxyl radicals (•OH) and sulfate radicals (SO4•-) are determined to be (2.71 ± 0.27)× 109 and (7.68 ± 0.37)× 108 M-1s-1, respectively. The degradation of ROX obeys the pseudo-first-order kinetics model, and the apparent rate constants (k) linearly increase with increasing the oxidants dosage from 0.10 to 1.0 mM. The solution pH (5.0-11.0) exhibits a limited effect on the oxidation of ROX in UV/H2O2 and UV/PDS processes, but a great enhancement is observed at pH 11.0 in UV/PMS process. Humic acid and bicarbonate obviously suppress the photodegradation of ROX. In addition, arsenic in ROX is mainly converted to As(V) in the three UV-based AOPs. Overall, this study provides essential information for the degradation of ROX via the traditional UV-based AOPs. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/33223319/Degradation_of_roxarsone_in_UV_based_advanced_oxidation_processes:_A_comparative_study_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(20)32548-6 DB - PRIME DP - Unbound Medicine ER -
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