Promoted oxidation of diclofenac with ferrate (Fe(VI)): Role of ABTS as the electron shuttle

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	Promoted oxidation of diclofenac with ferrate (Fe(VI)): Role of ABTS as the electron shuttle
	Qu, Jiuhui; Dong, Huiyu; Qiang, Zhimin; Lian, Junfeng
刊名	JOURNAL OF HAZARDOUS MATERIALS
	2017-08-15
卷号	336 期号:0 页码:65-70
关键词	Ferrate Abts Diclofenac Electron Shuttle
英文摘要	Reaction of Fe(VI) with 2,2'-azino-bis-(3-ethylbenzothiazoline-6-sulfonate) (ABTS) is widely adopted to determine aqueous ferrate (Fe(VI)) concentration based on ABTS(center dot+) formation. Interestingly, this study found that the addition of ABTS could accelerate the oxidation of diclofenac (DCF) by Fe(VI) significantly. Observed first-order rate constant of DCF in the presence of 30 mu M ABTS was found to be 36.2 folds of that without ABTS, with values of 3.08 and 0.085 min(-1), respectively. It was partly attributed to the formation of ABTS(center dot+). The apparent second-order rate constant (k(app)) for the oxidation of ABTS(center dot+) by Fe(VI) at pH 7.0 was determined to be 1.1 x 10(6)M(-1) s(-1), which was 3-5 orders of magnitude higher than those for the reactions of ABTS(center dot+) with DCF(k(app),(center dot+)(ABTS)(-DCF) =2.8 x 10(3) M-1 s(-1)) and Fe(VI) with DCF(k(app),(Fe) ((VI)-DCF) =17.7 M-1 s(-1)). Both the k(app),(Fe(VI)-ABTS) and k(app,Fe(VI)-DCF) decreased obviously with increasing pH, while the k(app,ABTS)(-DCF)(center dot+) exhibited little pH dependency. By acting as the electron shuttle, ABTS could enhance the removal efficiency of DCF over wide pH and natural organic matter concentration ranges. This study provides new insights to reconsider the role of organic matter during Fe(VI) oxidation and highlights the potential for increasing the reactivity of Fe(VI). (C) 2017 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39552]
专题	生态环境研究中心_环境水质学国家重点实验室
推荐引用方式 GB/T 7714	Qu, Jiuhui,Dong, Huiyu,Qiang, Zhimin,et al. Promoted oxidation of diclofenac with ferrate (Fe(VI)): Role of ABTS as the electron shuttle[J]. JOURNAL OF HAZARDOUS MATERIALS,2017,336(0):65-70.
APA	Qu, Jiuhui,Dong, Huiyu,Qiang, Zhimin,&Lian, Junfeng.(2017).Promoted oxidation of diclofenac with ferrate (Fe(VI)): Role of ABTS as the electron shuttle.JOURNAL OF HAZARDOUS MATERIALS,336(0),65-70.
MLA	Qu, Jiuhui,et al."Promoted oxidation of diclofenac with ferrate (Fe(VI)): Role of ABTS as the electron shuttle".JOURNAL OF HAZARDOUS MATERIALS 336.0(2017):65-70.