研究论文

喷雾燃烧热分解制备Cr掺杂TiO2纳米粒子的可见光催化性能

  • 田宝柱 ,
  • 李春忠 ,
  • 顾 锋 ,
  • 姜海波 ,
  • 胡彦杰
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  • 华东理工大学 材料科学与工程学院 超细材料制备与应用教育部重点实验室, 上海200237

收稿日期: 2008-10-06

  修回日期: 2008-12-02

  网络出版日期: 2009-07-20

Visible-light Photocataltic Activity of Cr-doped TiO2 Nanoparticles Synthesized by Flame Spray Pyrolysis

  • TIAN Bao-Zhu ,
  • LI Chun-Zhong ,
  • GU Feng ,
  • JIANG Hai-Bo ,
  • HU Yan-Jie
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  • Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai200237, China

Received date: 2008-10-06

  Revised date: 2008-12-02

  Online published: 2009-07-20

摘要

采用一步喷雾燃烧热解法制备了Cr掺杂TiO2纳米粒子,研究了Cr掺杂对样品微结构、吸光特性和可见光催化活性的影响. 结果表明:增加Cr掺杂量抑制锐钛矿相的形成,同时促进金红石相的形成. 在低Cr掺杂量下(≤1%),Cr主要以Cr3+的形态进入TiO2晶格,而Cr掺杂量过大时,易于形成Cr2O3团簇. 光催化降解2,4-二氯苯酚结果表明,适量的Cr3+掺杂可以有效地提高TiO2的可见光催化活性,获得最高光催化活性的Cr3+掺杂量为1at%. 样品可见光催化活性的提高主要与Cr掺杂引起的可见光吸收增强、晶相组成改善以及光生电子和空穴传输效率提高有关.

本文引用格式

田宝柱 , 李春忠 , 顾 锋 , 姜海波 , 胡彦杰 . 喷雾燃烧热分解制备Cr掺杂TiO2纳米粒子的可见光催化性能[J]. 无机材料学报, 2009 , 24(4) : 661 -665 . DOI: 10.3724/SP.J.1077.2009.00661

Abstract

Cr-doped TiO2 nanoparticles were synthesized by one-step flame spray pyrolysis technique. The effects of Cr3+ doping on the microstructure, light absorption property, and photocatalytic activity of the samples were investigated. It is found that increasing Cr3+ concentration restrains the formation of anatase and simultaneously favors the formation of rutile. At low concentration (≤1%), Cr is mainly incorporated into the crystal lattice of TiO2 in the form of Cr3+, while high Cr concentration promotes the formation of Cr2O3 clusters. The result of photocatalytic degradation of 2,4-dichlorophenol demonstrates that appropriate Cr3+ doping can evidently enhance the visible-light photocatalytic activity of TiO2. The optimal Cr3+ concentration to obtain the highest photocatalytic activity is 1at%. The improvement of visible-light photocatalytic activity derived from Cr doping is mainly related to the enhancement of visible light absorption, appropriate crystalline composition, and improved transfer efficiency of photogenerated electrons and holes.

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