Degradation of Acid Orange 7 using magnetic AgBr under visible light: The roles of oxidizing species

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	Degradation of Acid Orange 7 using magnetic AgBr under visible light: The roles of oxidizing species
	Li, Guoting; Wong, K. H.; Zhang, Xiwang; Hu, Chun; Yu, Jimmy C.; Chan, R. C. Y.; Wong, P. K.
刊名	CHEMOSPHERE
	2009-08
卷号	76 期号:9 页码:1185-1191
关键词	Magnetic Photocatalyst Agbr Ross Acid Orange 7 Visible Light
英文摘要	AgBr was creatively immobilized on a magnetic substrate (SiO(2)-coated Fe(3)O(4) nanoparticle, SFN) to achieve magnetic separation after visible light-driven photocatalytic oxidation (PCO). The resulted Ag/AgBr/SFN was characterized by TEM, vibrating sample magnetometer and other techniques. It is found that the average diameter of the Ag/AgBr/SFN particle is less than 20 nm. The typical superparamagnetic behavior of Ag/AgBr/SFN implies that the catalyst can be magnetically separated. The physicochemical features of the used Ag/AgBr/SFN after visible light irradiation were not dramatically changed by X-ray diffraction, UV-Vis diffuse reflectance spectra and Fourier transform-infrared analysis. SiO(2) interlayer was proven to slightly increase the degradation efficiency for an azo dye Acid Orange 7. UV-Vis spectra and HPLC analysis indicated that the dye was oxidized and decomposed. The photoactivity of Ag/AgBr/SFN was partly maintained after successive PCO under visible light. In order to evaluate the roles of e(-)-h(+) pairs and reactive oxygen species, the quenching effect was examined by employing Ag/AgBr/SFN and commercial TiO(2) (P-25) under visible light (lambda > 400 nm) and UV-A irradiation, respectively. Active h(+) and the resulting (center dot)OH played the major roles for degradation. The effect of active h(+) and (center dot)OH were proven to be highly dependent on the concentration of photocatalysts. The effect of (center dot)OH was more obvious for P-25, while that of active h(+) was more predominant for Ag/AgBr/SFN. (C) 2009 Elsevier Ltd. All rights reserved.
WOS记录号	WOS:000269780900003
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/21808]
专题	生态环境研究中心_中国科学院环境生物技术重点实验室
推荐引用方式 GB/T 7714	Li, Guoting,Wong, K. H.,Zhang, Xiwang,et al. Degradation of Acid Orange 7 using magnetic AgBr under visible light: The roles of oxidizing species[J]. CHEMOSPHERE,2009,76(9):1185-1191.
APA	Li, Guoting.,Wong, K. H..,Zhang, Xiwang.,Hu, Chun.,Yu, Jimmy C..,...&Wong, P. K..(2009).Degradation of Acid Orange 7 using magnetic AgBr under visible light: The roles of oxidizing species.CHEMOSPHERE,76(9),1185-1191.
MLA	Li, Guoting,et al."Degradation of Acid Orange 7 using magnetic AgBr under visible light: The roles of oxidizing species".CHEMOSPHERE 76.9(2009):1185-1191.