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Simultaneous photocatalytic Cr(VI) reduction and ciprofloxacin oxidation over TiO2/Fe-omicron composite under aerobic conditions: Performance, durability, pathway and mechanism
Diao, ZH; Xu, XR; Jiang, D; Liu, JJ; Kong, LJ; Li, G; Zuo, LZ; Wu, QH; xuxr@scsio.ac.cn
2017
Source PublicationCHEMICAL ENGINEERING JOURNAL
Volume315Pages:167-176
AbstractCoexistence of organic compounds and heavy metals in aquaculture waters is a widespread problem. In this study, a rapid reduction of Cr(VI) and oxidation of ciprofloxacin (CIP) in a simultaneous manner was firstly reported through the photocatalysis of TiO2/Fe-omicron composite under aerobic conditions. The significantly enhanced removals of Cr(VI) and CIP by TiO2/Fe-omicron composite due to a synergetic effect between oxidation and reduction processes. Within 60 min UV light irradiation, the simultaneous removals of Cr(VI) and CIP by TiO2/Fe-omicron composite were 97.7 and 94.6%, respectively, whereas the corresponding values by TiO2 Were 57.9 and 68.7%. CIP oxidation process could be significantly accelerated under acidic and aerobic conditions. Intriguingly, a low Pb(II) concentration could induce an enhancement of CIP oxidation, whereas a negative effect on both Cr(VI) reduction and CIP oxidation was observed at a relatively high concentration. A low concentration of ethylene diamine tetra-acetic acid (EDTA) did positively affect both Cr(VI) reduction and CIP oxidation processes, whereas a negative effect on CIP oxidation was found at a relatively high concentration. A possible reaction pathway and mechanism between CIP oxidation and Cr(VI) reduction was proposed. CIP was attacked by HO- produced from the decomposition of water and photo-excited holes through substitution and hydroxylation processes, leading to the production of a series of intermediates, whereas the Cr(VI) was converted into Cr(III) through the capture of photo -excited electrons and Fe reduction. (C)2017 Elsevier B.V. All rights reserved.
Department[Diao, Zeng-Hui; Xu, Xiang-Rong; Liu, Jin-Jun; Li, Gang; Zuo, Lin-Zi] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol, Guangdong Prov Key Lab Appl Marine Biol, Guangzhou 510301, Guangdong, Peoples R China; [Jiang, Dan] South China Normal Univ, Res Resources Ctr, Guangzhou 510631, Guangdong, Peoples R China; [Liu, Jin-Jun] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Kong, Ling-Jun] Guangzhou Univ, Sch Environm Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China; [Wu, Qi-Hang] Guangzhou Univ, Collaborat Innovat Ctr Water Qual Safety & Protec, Guangzhou 510006, Guangdong, Peoples R China
KeywordTio2 Fe-omicron Ciprofloxacin Cr(Vi) Reduction Oxidation
Funding ProjectLMB
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/16272
Collection中科院海洋生物资源可持续利用重点实验室
Corresponding Authorxuxr@scsio.ac.cn
Recommended Citation
GB/T 7714
Diao, ZH,Xu, XR,Jiang, D,et al. Simultaneous photocatalytic Cr(VI) reduction and ciprofloxacin oxidation over TiO2/Fe-omicron composite under aerobic conditions: Performance, durability, pathway and mechanism[J]. CHEMICAL ENGINEERING JOURNAL,2017,315:167-176.
APA Diao, ZH.,Xu, XR.,Jiang, D.,Liu, JJ.,Kong, LJ.,...&xuxr@scsio.ac.cn.(2017).Simultaneous photocatalytic Cr(VI) reduction and ciprofloxacin oxidation over TiO2/Fe-omicron composite under aerobic conditions: Performance, durability, pathway and mechanism.CHEMICAL ENGINEERING JOURNAL,315,167-176.
MLA Diao, ZH,et al."Simultaneous photocatalytic Cr(VI) reduction and ciprofloxacin oxidation over TiO2/Fe-omicron composite under aerobic conditions: Performance, durability, pathway and mechanism".CHEMICAL ENGINEERING JOURNAL 315(2017):167-176.
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