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Integration of •SO4--based AOP mediated by reusable iron particles and a sulfidogenic process to degrade and detoxify Orange II.
Water Res. 2020 May 01; 174:115622.WR

Abstract

The sulfate radical (•SO4-)-based advanced oxidation processes (AOPs) for the degradation of refractory organic pollutants consume a large amount of persulfate activators and often generate toxic organic by-products. In this study, we proposed a novel iron-cycling process integrating •SO4--based AOP mediated by reusable iron particles and a sulfidogenic process to degrade and detoxify Orange II completely. The rusted waste iron particles (Fe0@FexOy), which contained FeII/FeIII oxides (FexOy) on the shell and zero-valent iron (Fe0) in the core, efficiently activated persulfate to produce •SO4- and hydroxyl radicals (•OH) to degrade over 95% of Orange II within 120 min. Both •SO4- and •OH destructed Orange II through a sequence of electron transfer, electrophilic addition and hydrogen abstraction reactions to generate several organic by-products (e.g., aromatic amines and phenol), which were more toxic than the untreated Orange II. The AOP-generated organic by-products were further mineralized and detoxified in a sulfidogenic bioreactor with sewage treatment together. In a 170-d trial, the organic carbon removal efficiency was up to 90%. The inhibition of the bioreactor effluents on the growth of Chlorella pyrenoidosa became negligible, due to the complete degradation and mineralization of toxic AOP-generated by-products by aromatic-degrading bacteria (e.g., Clostridium and Dechloromonas) and other bacteria. The sulfidogenic process also well recovered the used Fe0@FexOy particles through the reduction of surface FeIII back into FeII by hydrogen sulfide formed and iron-reducing bacteria (e.g., Sulfurospirillum and Paracoccus). The regenerated Fe0@FexOy particles had more reactive surface FeII sites and exhibited much better reactivity in activating persulfate in at least 20 reuse cycles. The findings demonstrate that the integrated process is a promising solution to the remediation of toxic and refractory organic pollutants because it reduces the chemical cost of persulfate activation and also completely detoxifies the toxic by-products.

Authors+Show Affiliations

Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety, MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, China; Department of Environmental Engineering, Guangdong Polytechnic of Environmental Protection Engineering, Foshan, 528216, China.Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety, MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, China.Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety, MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, China.Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety, MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, China.Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety, MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, China.School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510006, China.School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510006, China. Electronic address: dr.jiangf@gmail.com.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32145554

Citation

Yu, Xiaoyu, et al. "Integration of •SO4--based AOP Mediated By Reusable Iron Particles and a Sulfidogenic Process to Degrade and Detoxify Orange II." Water Research, vol. 174, 2020, p. 115622.
Yu X, Sun J, Li G, et al. Integration of •SO4--based AOP mediated by reusable iron particles and a sulfidogenic process to degrade and detoxify Orange II. Water Res. 2020;174:115622.
Yu, X., Sun, J., Li, G., Huang, Y., Li, Y., Xia, D., & Jiang, F. (2020). Integration of •SO4--based AOP mediated by reusable iron particles and a sulfidogenic process to degrade and detoxify Orange II. Water Research, 174, 115622. https://doi.org/10.1016/j.watres.2020.115622
Yu X, et al. Integration of •SO4--based AOP Mediated By Reusable Iron Particles and a Sulfidogenic Process to Degrade and Detoxify Orange II. Water Res. 2020 May 1;174:115622. PubMed PMID: 32145554.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Integration of •SO4--based AOP mediated by reusable iron particles and a sulfidogenic process to degrade and detoxify Orange II. AU - Yu,Xiaoyu, AU - Sun,Jianliang, AU - Li,Guibiao, AU - Huang,Yi, AU - Li,Yu, AU - Xia,Dehua, AU - Jiang,Feng, Y1 - 2020/02/15/ PY - 2019/07/06/received PY - 2019/12/26/revised PY - 2020/02/12/accepted PY - 2020/3/8/pubmed PY - 2020/3/25/medline PY - 2020/3/8/entrez KW - Advanced oxidation KW - Detoxification KW - Iron reduction KW - Sulfate radicals KW - Sulfate-reducing bacteria SP - 115622 EP - 115622 JF - Water research JO - Water Res. VL - 174 N2 - The sulfate radical (•SO4-)-based advanced oxidation processes (AOPs) for the degradation of refractory organic pollutants consume a large amount of persulfate activators and often generate toxic organic by-products. In this study, we proposed a novel iron-cycling process integrating •SO4--based AOP mediated by reusable iron particles and a sulfidogenic process to degrade and detoxify Orange II completely. The rusted waste iron particles (Fe0@FexOy), which contained FeII/FeIII oxides (FexOy) on the shell and zero-valent iron (Fe0) in the core, efficiently activated persulfate to produce •SO4- and hydroxyl radicals (•OH) to degrade over 95% of Orange II within 120 min. Both •SO4- and •OH destructed Orange II through a sequence of electron transfer, electrophilic addition and hydrogen abstraction reactions to generate several organic by-products (e.g., aromatic amines and phenol), which were more toxic than the untreated Orange II. The AOP-generated organic by-products were further mineralized and detoxified in a sulfidogenic bioreactor with sewage treatment together. In a 170-d trial, the organic carbon removal efficiency was up to 90%. The inhibition of the bioreactor effluents on the growth of Chlorella pyrenoidosa became negligible, due to the complete degradation and mineralization of toxic AOP-generated by-products by aromatic-degrading bacteria (e.g., Clostridium and Dechloromonas) and other bacteria. The sulfidogenic process also well recovered the used Fe0@FexOy particles through the reduction of surface FeIII back into FeII by hydrogen sulfide formed and iron-reducing bacteria (e.g., Sulfurospirillum and Paracoccus). The regenerated Fe0@FexOy particles had more reactive surface FeII sites and exhibited much better reactivity in activating persulfate in at least 20 reuse cycles. The findings demonstrate that the integrated process is a promising solution to the remediation of toxic and refractory organic pollutants because it reduces the chemical cost of persulfate activation and also completely detoxifies the toxic by-products. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/32145554/Integration_of_•SO4__based_AOP_mediated_by_reusable_iron_particles_and_a_sulfidogenic_process_to_degrade_and_detoxify_Orange_II_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(20)30158-5 DB - PRIME DP - Unbound Medicine ER -