The effect of transition metal substitution on the catalytic activity of magnetite in heterogeneous Fenton reaction: In interfacial view

	The effect of transition metal substitution on the catalytic activity of magnetite in heterogeneous Fenton reaction: In interfacial view
	Liang, XL; He, ZS; Zhong, YH; Tan, W; He, HP; Yuan, P; Zhu, JX; Zhang, J; Zhang J(张静)
刊名	COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
	2013
卷号	435 期号:SI 页码:28-35
关键词	Transition metal substituted magnetite Heterogeneous Fenton reaction Degradation kinetics Different dyes Interfacial view
英文摘要	Recently, growing interest has been evoked in the application of transition metal substituted magnetite as heterogeneous Fenton catalyst in the degradation of organic pollutants. In the present study, the effect of substitution on the heterogeneous Fenton catalytic activity of magnetite was investigated in interfacial view. The substitution of transition metals improved the degradation of organic pollutants by accelerating the (OH)-O-center dot free radical generation and enhancing the adsorption of pollutant and H2O2. As the octahedral sites were exclusively exposed at magnetite surface, V3+ and Cr3+ occupying the octahedral sites not only participated in H2O2 decomposition to produce (OH)-O-center dot, but also quickened the electron transfer in the inverse spinel structure to reduce Fe3+ to Fe2+ with higher Fenton activity. Ti4+, V3+ and Cr3+ increased the specific surface area and surface hydroxyl amount of magnetite, resulting in larger adsorption of methylene blue (MB) and H2O2 and accordingly faster degradation. In Ti-V co-doped magnetite, though Ti4+ was thermodynamically unfavorable for (OH)-O-center dot generation, Ti4+ showed a more prominent effect than V3+ on improving catalytic activity of magnetite, ascribed to its more significant effect on the increase of specific surface area and surface hydroxyl amount of magnetite. The catalytic efficiency was closely related to not only the nature of substituting metals, but also the pollutant characters. Due to the different adsorption behaviors, the degradation MB and acid orange II followed different degradation mechanism and was also described by different kinetics. The above results will be benefit for the application of transition metal substituted magnetite in environmental engineering. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	Chemistry
收录类别	SCI
WOS记录号	WOS:000324605700006
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/223773]
专题	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Liang, XL,He, ZS,Zhong, YH,et al. The effect of transition metal substitution on the catalytic activity of magnetite in heterogeneous Fenton reaction: In interfacial view[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2013,435(SI):28-35.
APA	Liang, XL.,He, ZS.,Zhong, YH.,Tan, W.,He, HP.,...&张静.(2013).The effect of transition metal substitution on the catalytic activity of magnetite in heterogeneous Fenton reaction: In interfacial view.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,435(SI),28-35.
MLA	Liang, XL,et al."The effect of transition metal substitution on the catalytic activity of magnetite in heterogeneous Fenton reaction: In interfacial view".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 435.SI(2013):28-35.