Photosensitized oxidation of substituted phenols on aluminum phthalocyanine-intercalated organoclay

doi:10.1021/es0487630

CORC > 化学研究所 > 中国科学院化学研究所

	Photosensitized oxidation of substituted phenols on aluminum phthalocyanine-intercalated organoclay
	Xiong, ZG ; Xu, YM ; Zhu, LZ ; Zhao, JC
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2005-01-15
卷号	39 期号:2 页码:651-657
ISSN号	0013-936X
DOI	10.1021/es0487630
英文摘要	Bentonite modified with cationic surfactant, cetyltrimethylammonium bromide (CTMA), was an effective sorbent for organic pollutants in water. To make the sorbent recyclable, aluminum phthalocyanine (AIPc), a representative photosensitizer for generation of singlet oxygen, was inserted successfully into the interlamellar space of CTMA-modified bentonite. Under visible light ( gimel > 450 nm) irradiation, the composite catalyst exhibited a remarkable activity for degradation of the recalcitrant pollutants phenol, 4-chlorophenol, 4-nitrophenol, 2,4-dichlorophenol, and 2,4,6-trichlorophenol in an aerated aqueous medium. The initial rate of the heterogeneous photoreaction was found to increase with the initial amount of the substrate sorption onto the catalyst, the kinetics following the Langmuir-Hinshelwood equation. Loading of AIPc into the organoclay led to slight expansion of the clay basal spacings from 1.82 to 2.15 nm, but the sorption capacity was decreased notably. The optimal loading of AIPc was about 0.25 wt %. The result demonstrates that the surfactant-modified bentonite not only offers a hydrophobic zone for enrichment of organic contaminants but also provides a flexible environment for destruction of the sorbed pollutants by singlet oxygen generated in situ. It was noted, however, that during four repeated experiments, both the sorption and the degradation rate of 2,4,6-trichlorophenol were gradually decreased, due to some intermediates formed and sorbed onto the catalyst surface.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000226441300041
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/57513]
专题	中国科学院化学研究所
通讯作者	Xu, YM
作者单位	1.Zhejiang Univ, Dept Chem, Hangzhou 310027, Peoples R China 2.Zhejiang Univ, Dept Environm Sci, Hangzhou 310028, Peoples R China 3.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Lab Photochem, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Xiong, ZG,Xu, YM,Zhu, LZ,et al. Photosensitized oxidation of substituted phenols on aluminum phthalocyanine-intercalated organoclay[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2005,39(2):651-657.
APA	Xiong, ZG,Xu, YM,Zhu, LZ,&Zhao, JC.(2005).Photosensitized oxidation of substituted phenols on aluminum phthalocyanine-intercalated organoclay.ENVIRONMENTAL SCIENCE & TECHNOLOGY,39(2),651-657.
MLA	Xiong, ZG,et al."Photosensitized oxidation of substituted phenols on aluminum phthalocyanine-intercalated organoclay".ENVIRONMENTAL SCIENCE & TECHNOLOGY 39.2(2005):651-657.