Citation: YU Chang-Lin, CAO Fang-Fang, SHU Qing, BAO Yu-Long, XIE Zhi-Peng, YU Jimmy C, YANG Kai. Preparation, Characterization and Photocatalytic Performance of Ag/BiOX (X=Cl, Br, I) Composite Photocatalysts[J]. Acta Physico-Chimica Sinica, ;2012, 28(03): 647-653. doi: 10.3866/PKU.WHXB201201051 shu

Preparation, Characterization and Photocatalytic Performance of Ag/BiOX (X=Cl, Br, I) Composite Photocatalysts

1.
1. School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi Province, P. R. China;
2. Fujian Provincial Key Laboratory of Photocatalysis-State Key Laboratory Breeding Base, Fuzhou University, Fuzhou 350002, P. R. China;
3. Department of Chemistry, The Chinese University of Hong Kong, Hong Kong, P. R. China

Received Date: 13 September 2011
Available Online: 5 January 2012
Fund Project: 国家自然科学基金(21067004) (21067004) 江西省自然科学基金(2010GZH0048) (2010GZH0048) 江西省教育厅科技项目(GJJ12344) (GJJ12344)固体表面物理化学国家重点实验室(厦门大学)开放基金(200906)资助项目 (厦门大学)开放基金(200906)

A series of novel bismuth oxyhalide Ag/BiOX (X=Cl, Br, I) composite photocatalysts were synthesized by a solution-based photodeposited method at room temperature. The resulting products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) emission spectroscopy, UV-Vis diffuse reflectance spectroscopy (DRS), and N₂ physical adsorption. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of acid orange II under visible light (420 nm< λ <660 nm) irradiation. Analysis by N₂ physical adsorption showed that deposition of Ag decreased the specific surface area of the catalyst. UV-Vis DRS analysis indicated that the presence of Ag could result in surface plasmon absorption, effectively increasing the visible light absorption ability of BiOCl and BiOBr. Furthermore, PL analysis indicated that Ag could effectively suppress the recombination of photogenerated electron (e^-)-hole (h⁺) pairs of Ag/BiOX. Activity testing indicated that the deposition of an optimal amount of 1%-2% (w, mass fraction) Ag brought about 10, 13, and 2 fold increases in the photocatalytic activity of BiOCl, BiOBr, and BiOI, respectively. The high photocatalytic performance of the composite photocatalysts could be attributed to the strong visible light absorption, silver plasmon photocatalysis role and the recombination restraint of the e^-/h⁺ pairs resulting from the presence of metal silver particles.
- Bismuth oxyhalide,
- Silver deposition,
- Photocatalysis,
- Visible light,
- Promotion,
- Acid orange II
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