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Comparison of radical and non-radical activated persulfate systems for the degradation of imidacloprid in water.
Ecotoxicol Environ Saf. 2020 Jan 30; 188:109891.EE

Abstract

The study focuses on degradation efficiency of non-radical activation and radical activation systems of persulfate (PS) to degrade imidacloprid (IMI) by using sodium persulfate (SPS) as PS source. Copper oxide (CuO)-SPS and CuO/biochar (BC)-SPS were selected as PS non-radical activation systems, and pyrite (PyR)-SPS was selected as PS radical activation system. The degradation by CuO-SPS, CuO/BC-SPS and PyR-SPS systems was investigated from acidic to basic conditions (pH 3.0-11.0). Highest degradation by CuO-SPS and CuO/BC-SPS systems was achieved over pH 11.0. In contrast, highest degradation by PyR-SPS system was achieved over pH 3.0, however, PyR-SPS system was also found effective up to pH 9.0. It was found that degradation was more efficient in PS radical activation system, indicating that IMI could be oxidized by radicals rather than by activated PS. Electron paramagnetic resonance (EPR) analysis was carried out to investigate the generation of sulfate (SO4-) and hydroxyl (OH) radicals, which indicated the presence of SO4- and OH in CuO-SPS, CuO/BC and PyR-SPS systems. However, free radical quenching analysis indicated that radicals were main reactive oxygen species for degradation. The lower degradation in PS non-radical activation systems was probably resulted from radicals existed as minor reactive oxygen species. The findings indicated that non-radical oxidation systems showed low reality for degradation and good degradation could be achieved by radical oxidation system. The degradation was also carried out in real waters to investigate the potential applicability of applied systems, which supported PyR-SPS system for effective degradation.

Authors+Show Affiliations

School of Environment and Energy, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou, 510006, China.School of Environment and Energy, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou, 510006, China; The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, China; State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China. Electronic address: zhangyq@scut.edu.cn.School of Environment and Energy, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou, 510006, China.School of Environment and Energy, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou, 510006, China. Electronic address: chshuang@scut.edu.cn.School of Environment and Energy, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou, 510006, China.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31740236

Citation

Hayat, Waseem, et al. "Comparison of Radical and Non-radical Activated Persulfate Systems for the Degradation of Imidacloprid in Water." Ecotoxicology and Environmental Safety, vol. 188, 2020, p. 109891.
Hayat W, Zhang Y, Hussain I, et al. Comparison of radical and non-radical activated persulfate systems for the degradation of imidacloprid in water. Ecotoxicol Environ Saf. 2020;188:109891.
Hayat, W., Zhang, Y., Hussain, I., Huang, S., & Du, X. (2020). Comparison of radical and non-radical activated persulfate systems for the degradation of imidacloprid in water. Ecotoxicology and Environmental Safety, 188, 109891. https://doi.org/10.1016/j.ecoenv.2019.109891
Hayat W, et al. Comparison of Radical and Non-radical Activated Persulfate Systems for the Degradation of Imidacloprid in Water. Ecotoxicol Environ Saf. 2020 Jan 30;188:109891. PubMed PMID: 31740236.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Comparison of radical and non-radical activated persulfate systems for the degradation of imidacloprid in water. AU - Hayat,Waseem, AU - Zhang,Yongqing, AU - Hussain,Imtyaz, AU - Huang,Shaobin, AU - Du,Xiaodong, Y1 - 2019/11/15/ PY - 2019/07/13/received PY - 2019/10/24/revised PY - 2019/10/27/accepted PY - 2019/11/20/pubmed PY - 2019/11/20/medline PY - 2019/11/20/entrez KW - Heterogeneous degradation KW - Metal activators KW - Persulfate oxidation KW - Pesticides KW - Radical activation SP - 109891 EP - 109891 JF - Ecotoxicology and environmental safety JO - Ecotoxicol. Environ. Saf. VL - 188 N2 - The study focuses on degradation efficiency of non-radical activation and radical activation systems of persulfate (PS) to degrade imidacloprid (IMI) by using sodium persulfate (SPS) as PS source. Copper oxide (CuO)-SPS and CuO/biochar (BC)-SPS were selected as PS non-radical activation systems, and pyrite (PyR)-SPS was selected as PS radical activation system. The degradation by CuO-SPS, CuO/BC-SPS and PyR-SPS systems was investigated from acidic to basic conditions (pH 3.0-11.0). Highest degradation by CuO-SPS and CuO/BC-SPS systems was achieved over pH 11.0. In contrast, highest degradation by PyR-SPS system was achieved over pH 3.0, however, PyR-SPS system was also found effective up to pH 9.0. It was found that degradation was more efficient in PS radical activation system, indicating that IMI could be oxidized by radicals rather than by activated PS. Electron paramagnetic resonance (EPR) analysis was carried out to investigate the generation of sulfate (SO4-) and hydroxyl (OH) radicals, which indicated the presence of SO4- and OH in CuO-SPS, CuO/BC and PyR-SPS systems. However, free radical quenching analysis indicated that radicals were main reactive oxygen species for degradation. The lower degradation in PS non-radical activation systems was probably resulted from radicals existed as minor reactive oxygen species. The findings indicated that non-radical oxidation systems showed low reality for degradation and good degradation could be achieved by radical oxidation system. The degradation was also carried out in real waters to investigate the potential applicability of applied systems, which supported PyR-SPS system for effective degradation. SN - 1090-2414 UR - https://www.unboundmedicine.com/medline/citation/31740236/Comparison_of_radical_and_non_radical_activated_persulfate_systems_for_the_degradation_of_imidacloprid_in_water_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0147-6513(19)31222-9 DB - PRIME DP - Unbound Medicine ER -