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	Enhancement of the visible light activity and stability of Ag2CO3 by formation of AgI/Ag2CO3 heterojunction
	Yu, Changlin1; Wei, Longfu1,2; Zhou, Wanqin1; Chen, Jianchai1; Fan, Qizhe1; Liu, Hong3
	2014-11-15
摘要	An insurmountable problem for silver-based semiconductor photocatalysts is their poor stability. Here, at room temperature, AgI with different concentrations (5%, 10%, 20% and 30%) were coupled into Ag2CO3, producing a series of novel AgI/Ag2CO3 composite photocatalysts. The effects of AgI addition on the Ag2CO3 catalyst for photocatalytic degradation of methyl orange (MO) under visible light irradiation have been investigated. Some physicochemical technologies like N-2 physical adsorption/desorption, powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectroscopy (UV-vis DRS) were applied to characterize these products. Results show that the photocatalytic degradation activity of AgI/Ag2CO3 photocatalyst is much higher than that of pure AgI and Ag2CO3. With the optimal content of AgI (20 wt%), the AgI/Ag2CO3 exhibits the highest photocatalytic degradation efficiency. Its first order reaction rate constant (0.54 h(-1)) is 20 times of that of AgI (0.026 h(-1)) and 3.6 times of that of Ag2CO3 (0.15 h(-1)). The characterizations and theory calculation show that AgI and Ag2CO3 have suitably matched band gap structures. The formation of AgI/Ag2CO3 heterojunction with intimate interface could effectively increase the separation efficiency of the pairs and promote the production of " OH and Of radicals, which brings about the fast degradation rate of the dye and an increase in photocatalytic stability. (C) 2014 Elsevier B.V. All rights reserved.
关键词	AgI Ag2CO3 Heterojunction Visible light Photocatalysis Methyl orange
DOI	10.1016/j.apsusc.2014.05.158
发表期刊	APPLIED SURFACE SCIENCE
ISSN	0169-4332
卷号	319页码:312-318
通讯作者	Yu, CL (reprint author), Jiangxi Univ Sci & Technol, Sch Met & Chem Engn, Ganzhou 341000, Jiangxi, Peoples R China.
收录类别	SCI
WOS记录号	WOS:000344616000045
语种	英语