物理化学学报 >> 2012, Vol. 28 >> Issue (03): 647-653.doi: 10.3866/PKU.WHXB201201051

催化和表面科学 上一篇    下一篇

Ag/BiOX (X=Cl, Br, I)复合光催化剂的制备、表征及其光催化性能

余长林1, 操芳芳1,2, 舒庆1, 包玉龙1, 谢志鹏1, YU Jimmy C3, 杨凯1   

  1. 1. 江西理工大学冶金与化学工程学院, 江西赣州 341000;
    2. 福建省光催化重点实验室—省部共建国家重点实验室培育基地,福州大学, 福州 350002;
    3. 香港中文大学化学系, 香港
  • 收稿日期:2011-09-13 修回日期:2011-12-26 发布日期:2012-02-23
  • 通讯作者: 余长林 E-mail:yuchanglinjx@163.com
  • 基金资助:

    国家自然科学基金(21067004), 江西省自然科学基金(2010GZH0048), 江西省教育厅科技项目(GJJ12344)和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

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

YU Chang-Lin1, CAO Fang-Fang1,2, SHU Qing1, BAO Yu-Long1, XIE Zhi-Peng1, YU Jimmy C3, YANG Kai1   

  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:2011-09-13 Revised:2011-12-26 Published:2012-02-23
  • Contact: YU Chang-Lin E-mail:yuchanglinjx@163.com
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21067004), Natural Science Foundation of Jiangxi Province, China (2010GZH0048), Technological Project of Jiangxi Province Education Office, China (GJJ12344), and Open Project Program of State Key Laboratory of Physical Chemistry of Solid Surfaces (Xiamen University), China (200906).

摘要: 采用光化学沉积法制备了一系列不同Ag含量的新型Ag/BiOX (X=Cl, Br, I)复合光催化剂, 应用X射线粉末衍射(XRD)、扫描电镜(SEM)、X射线光电子能谱(XPS)、光致发光(PL)谱、紫外-可见(UV-Vis)光谱和N2物理吸附等手段对催化剂进行表征, 并以420 nm< λ <660 nm的可见光为光源, 评价了该催化剂光催化降解酸性橙II 的活性, 考察了不同含量的Ag沉积对BiOX样品光催化性能的影响. N2物理吸附测试结果表明, 沉积银在一定程度降低了催化剂的比表面积. UV-Vis 测试结果表明, Ag 能产生表面等离子共振吸收, 有效增强BiOCl 和BiOBr 对可见光的吸收能力. PL测试结果则表明, Ag能显著抑制光生电子(e-)和空穴(h+)的复合. Ag的存在大幅度提高了BiOX 对染料的光催化降解活性. 当负载Ag 的质量分数(w)为1%-2%时, 可使BiOCl、BiOBr 和BiOI 光催化活性分别提高了10、13 和2 倍. Ag/BiOX 复合光催化剂具有更高催化活性的原因是复合光催化剂对可见光有很强的吸收能力, 同时产生了银等离子体光催化作用和银抑制了Ag/BiOX (X=Cl, Br, I)的光生电子-空穴的复合.

关键词: 铋氧卤化化合物, 银沉积, 光催化, 可见光, 促进, 酸性橙II

Abstract: 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.

Key words: Bismuth oxyhalide, Silver deposition, Photocatalysis, Visible light, Promotion, Acid orange II

MSC2000: 

  • O643