|Comparative study of Rhodamine B degradation by the systems pyrite/H2O2 and pyrite/persulfate: Reactivity, stability, products and mechanism|
|Diao, ZH; Liu, JJ; Hu, YX; Kong, LJ; Jiang, D; Xu, XR; email@example.com
|Source Publication||SEPARATION AND PURIFICATION TECHNOLOGY
|Abstract||This study makes a comparison between the pyrite/H2O2 and pyrite/persulfate (PS) Fenton systems to investigate the degradation of Rhodamine B (RhB). The most relevant findings revealed that a significantly negative effect of carbonate and a narrow pH range of 2-4 were found in the pyrite/H2O2 system, whereas a relatively less negative effect of carbonate and a broad pH range of 2-11 were observed in the pyrite/PS system. It was demonstrated that the pyrite catalyst in the pyrite/PS system exhibited better structural stability and showed a relatively limited loss in performance upon reuse as compared to pyrite in the pyrite/H2O2 system. Experiments with different scavengers indicated that HO center dot radicals were the major reactive species responsible for RhB degradation by pyrite/H2O2. In this case the contribution of radical was in the order of HOHO center dot > O-2(center dot-) whereas the SO4 center dot- radicals prevailed over HO center dot in the pyrite/PS system. The role of O-2(center dot-) in the recycling of Fe(III) to Fe(II) was very important. The possible mechanism for RhB degradation by pyrite/H2O2 mainly involves the reaction of the dissolved Fe2+ released by the surface of the pyrite with added H2O2, whereas the reaction of the dissolved Fe2+ formed in the pyrite with PS triggers degradation in the pyrite/PS system. The degradation of RhB is initiated in both cases by N-deethylation, chromophore cleavage and ring opening processes, which leads to the production of a series of oxidation products with smaller molecular sizes. The pyrite/PS system is here proven to be a superior heterogeneous Fenton-like oxidant process for the removal of dyes from wastewater. (C) 2017 Elsevier B.V. All rights reserved.|
|Department||[Diao, Zeng-Hui; Liu, Jin-Jun; Hu, Yong-Xia; Xu, Xiang-Rong] Chinese Acad Sci, Guangdong Prov Key Lab Appl Marine Biol, Key Lab Trop Marine Bioresources & Ecol, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Liu, Jin-Jun; Hu, Yong-Xia] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Kong, Ling-Jun] Guangzhou Univ, Sch Environm Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China; [Jiang, Dan] South China Normal Univ, Res Resources Ctr, Guangzhou 510631, Guangdong, Peoples R China
Rhodamine b (Rhb)
Diao, ZH,Liu, JJ,Hu, YX,et al. Comparative study of Rhodamine B degradation by the systems pyrite/H2O2 and pyrite/persulfate: Reactivity, stability, products and mechanism[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2017,184:374-383.
Diao, ZH.,Liu, JJ.,Hu, YX.,Kong, LJ.,Jiang, D.,...&firstname.lastname@example.org.(2017).Comparative study of Rhodamine B degradation by the systems pyrite/H2O2 and pyrite/persulfate: Reactivity, stability, products and mechanism.SEPARATION AND PURIFICATION TECHNOLOGY,184,374-383.
Diao, ZH,et al."Comparative study of Rhodamine B degradation by the systems pyrite/H2O2 and pyrite/persulfate: Reactivity, stability, products and mechanism".SEPARATION AND PURIFICATION TECHNOLOGY 184(2017):374-383.
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