物理化学学报 >> 2012, Vol. 28 >> Issue (08): 1985-1991.doi: 10.3866/PKU.WHXB201205161

催化和表面科学 上一篇    下一篇

具有不同Bi/Ti摩尔比的BiOI/TiO2 (A)光催化剂的结构与性能

李慧泉1,2, 崔玉民1,2, 吴兴才3, 华林4, 洪文珊1   

  1. 1. 安徽阜阳师范学院化学化工学院, 安徽 阜阳 236041;
    2. 安徽环境污染物降解与监测省级实验室, 安徽 阜阳 236041;
    3. 南京大学配位化学国家重点实验室, 南京 210093;
    4. 新加坡Linovus技术有限公司研发中心, 新加坡 059818
  • 收稿日期:2012-03-19 修回日期:2012-05-15 发布日期:2012-07-10
  • 通讯作者: 崔玉民, 吴兴才 E-mail:cymlh@fync.edu.cn; wuxingca@nju.edu.cn
  • 基金资助:

    国家自然科学基金(21171091)和安徽省高校省级自然科学基金(KJ2012A217, KJ2012B136)资助项目

Structure and Properties of BiOI/TiO2 (A) Photocatalysts with Different Bi/Ti Molar Ratios

LI Hui-Quan1,2, CUI Yu-Min1,2, WU Xing-Cai3, HUA Lin4, HONG Wen-Shan1   

  1. 1. School of Chemistry and Chemical Engineering, Fuyang Normal College, Fuyang, 236041, Anhui Province, P. R. China;
    2. Anhui Provincical Key Laboratory for Degradation and Monitoring of Pollution of the Environment, Fuyang 236041, P. R. China;
    3. The State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, P. R. China;
    4. R&D center, Singapore Linovus Technology Pte Ltd, 059818, Singapore
  • Received:2012-03-19 Revised:2012-05-15 Published:2012-07-10
  • Contact: CUI Yu-Min, WU Xing-Cai E-mail:cymlh@fync.edu.cn; wuxingca@nju.edu.cn
  • Supported by:

    The project was support by the National Science Foundation of China (21171091) and Natural Science Foundation of Higher Education Institutions in Anhui Province, China (KJ2012A217, KJ2012B136).

摘要:

在室温条件下通过沉积法制备了BiOI敏化纳米锐钛矿TiO2 (A)光催化剂. 用X射线衍射(XRD),X射线光电子能谱(XPS), 光致发光(PL)光谱和紫外-可见漫反射(UV-Vis DRS)等手段对其进行了表征. 通过罗丹明B(RhB)催化降解实验评价了其光催化活性. 随BiOI含量增加, BiOI/TiO2 (A)在370-630 nm的吸收强度增强, 吸收带边红移增加, 紫外和可见光催化活性先增加, 当BiOI含量约为1.7% (质量分数)时, 各自达到最大值, 然后随BiOI含量的进一步增加而减小. 1.7% BiOI/TiO2 (A)的可见光活性明显高于P25, 它的紫外光活性也略高于P25. 在BiOI含量相近时, BiOI/TiO2 (A)比BiOI/P25具有更低的光催化活性. 和TiO2 (A)相比, 1.7% BiOI/TiO2 (A)明显具有更高的紫外和可见光催化活性, 这归功于它在370-630 nm的强吸收、吸收带边红移明显以及光生电子和空穴的有效转移, 减少了电子-空穴对的复合.

关键词: 沉积法, 敏化, 锐钛矿, BiOI含量, 光催化

Abstract:

BiOI-sensitized nano-anatase (TiO2 (A)) photocatalysts were prepared by a deposition method at room temperature, and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL), and UV-Vis diffuse reflectance spectra (UV-Vis DRS). The photocatalytic activities were evaluated by photo-degradation experiments of rhodamine B. With increasing BiOI content, the absorption intensity of BiOI/TiO2 (A) increases in the 370-630 nm region and the absorption band edge redshifts. The UV and visible light photocatalytic activities increase, reaching a maximum when the Bi/Ti molar ratio is 1.7% . The 1.7% BiOI/TiO2 (A) catalyst exhibits much higher visible-light photoactivity than P25, and its UV-light photoactivity is slightly higher than that of P25. The UV and visible light photocatalytic activities of BiOI/TiO2 (A) with similar BiOI content are lower than those of BiOI/P25 catalysts. Compared with TiO2 (A), 1.7% BiOI/TiO2 (A) shows higher UV and visible light photoactivities. This is attributed to the strong absorption in the 370-630 nm region, the redshift of the absorption band edge, and the effective transfer of the photogenerated electrons and holes, which reduces the recombination of electron-hole pairs.

Key words: Deposition method, Sensitized, Anatase, BiOI content, Photocatalysis

MSC2000: 

  • O644