Surface hydroxyl groups of synthetic alpha-FeOOH in promoting (OH)-O-center dot generation from aqueous ozone: Property and activity relationship

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	Surface hydroxyl groups of synthetic alpha-FeOOH in promoting (OH)-O-center dot generation from aqueous ozone: Property and activity relationship
	Zhang, Tao; Li, Chunjuan; Ma, Jun; Tian, Hai; Qiang, Zhimin
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2008-07-16
卷号	82 期号:2015-01-02 页码:131-137
关键词	synthetic alpha-FeOOH ATR-FTIR oxo-hydroxide surface hydroxyl group hydroxyl radical generation catalytic ozonation
英文摘要	This work investigated the relationship between the property of the surface hydroxyl groups of hydroxylated synthetic alpha-FeOOH and their catalytic activity in promoting hydroxyl radical ((OH)-O-center dot) generation from aqueous ozone. Nitrobenzene was used as an ozone-resistant probe to quantify (OH)-O-center dot generation. ATR-FTIR analysis reveals that sulfate and phosphate suppressed the catalytic activity of alpha-FeOOH through substituting its surface hydroxyl groups, which implies that the catalyst surface hydroxyl groups were active sites for promoting (OH)-O-center dot generation. Compared with other synthetic oxo-hydroxides such as beta-FeOOH, gamma-FeOOH and gamma-AlOOH, alpha-FeOOH achieved a highest R-c value (i.e., 1.11 x 10(-7), molar concentration ratio of (OH)-O-center dot to O-3) in catalytic ozonation. No correlation could be established between the surface hydroxyl density and the (OH)-O-center dot-promoting activity of the oxo-hydroxides. In contrast, their catalytic activity was found to be reversely related to the IR stretching frequencies of surface hydroxyl groups. The results indicate that not all surface hydroxyl groups of the oxo-hydroxides possessed the same high catalytic activity, but the weak surface MeO-H bonds were favorable sites for promoting (OH)-O-center dot generation from aqueous ozone. The surface hydroxyl-ozone interaction was thus proposed for the catalyzed (OH)-O-center dot generation, which can explain why neutral surface hydroxyl species of alpha-FeOOH was more active than protonated or deprotonated species. (C) 2008 Elsevier B.V. All rights reserved.
WOS记录号	WOS:000257943000014
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/22290]
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	Zhang, Tao,Li, Chunjuan,Ma, Jun,et al. Surface hydroxyl groups of synthetic alpha-FeOOH in promoting (OH)-O-center dot generation from aqueous ozone: Property and activity relationship[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2008,82(2015-01-02):131-137.
APA	Zhang, Tao,Li, Chunjuan,Ma, Jun,Tian, Hai,&Qiang, Zhimin.(2008).Surface hydroxyl groups of synthetic alpha-FeOOH in promoting (OH)-O-center dot generation from aqueous ozone: Property and activity relationship.APPLIED CATALYSIS B-ENVIRONMENTAL,82(2015-01-02),131-137.
MLA	Zhang, Tao,et al."Surface hydroxyl groups of synthetic alpha-FeOOH in promoting (OH)-O-center dot generation from aqueous ozone: Property and activity relationship".APPLIED CATALYSIS B-ENVIRONMENTAL 82.2015-01-02(2008):131-137.