Comparative study of Rhodamine B degradation by the systems pyrite/H2O2 and pyrite/persulfate: Reactivity, stability, products and mechanism

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	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
刊名	SEPARATION AND PURIFICATION TECHNOLOGY
	2017
卷号	184 页码:374-383
关键词	Pyrite Fenton-like oxidation H2O2 Mechanism Rhodamine B (RhB)
通讯作者	xuxr@scsio.ac.cn
中文摘要	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.
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/16311]
专题	南海海洋研究所_中科院海洋生物资源可持续利用重点实验室
推荐引用方式 GB/T 7714	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.
APA	Diao, ZH,Liu, JJ,Hu, YX,Kong, LJ,Jiang, D,&Xu, XR.(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.
MLA	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.