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氮掺杂Bi2O3光催化剂可见光催化降解2,4-二氯酚

卢远刚,杨迎春*,刘盛余,叶芝祥   

  1. (成都信息工程学院资源环境学院，大气环境模拟与污染控制四川省高校重点实验室 成都 610225)
  • 收稿日期:2011-10-27 修回日期:2011-12-05 出版日期:2012-09-10 发布日期:2012-09-10
  • 通讯作者: 杨迎春，教授; Tel:028-85966941; Fax:028-85966089; E-mail:yangyingchun@cuit.edu.cn; 研究方向：光催化与污染控制
  • 基金资助:
    四川省教育厅重点基金项目(07ZA012)

Photocatalytic Degradation of 2,4-Dichlorophenol under Visible-light Irradiation Using Nitrogen-doped Bi2O3 Photocatalyst

LU Yuangang, YANG Yingchun*, LIU Shengyu, YE Zhixiang   

  1. (Air Environmental Modeling and Pollution Controlling Key Laboratory of Sichuan
    Higher Education Institutes,Department of Resources and Environment,
    Chengdu University of Information Technology,Chengdu 610225)
  • Received:2011-10-27 Revised:2011-12-05 Published:2012-09-10 Online:2012-09-10
  • Contact: Yang yingchun

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摘要： 采用自制的Bi2O3及氮掺杂Bi2O3（N-Bi2O3）光催化剂，以卤钨灯为光源，在可见光下对2,4-二氯酚进行光催化降解。 结果表明，N-Bi2O3较Bi2O3具有更高的可见光催化活性。 当N-Bi2O3光催化剂投加量为2.0 g/L、2,4-二氯酚初始浓度为20 mg/L和pH=7时，光催化反应320 min，2,4-二氯酚的降解率最高可达到91.5%。 2,4-二氯酚的光催化反应初活性与其浓度之间的关系符合Langmuir-Hinshelwood动力学速率模型。 对降解过程中总有机碳及Cl-测试结果表明，N-Bi2O3光催化剂能较好地完成对2,4-二氯酚的深度矿化及脱氯。

关键词: 氮掺杂Bi2O3, 光催化, 可见光, 二氯酚, 动力学

Abstract: The photocatalytic degradation of 2,4-dichlorophenol was carried out using un-doped and nitrogen-doped bismuth oxide as catalysts under visible-light irradiation. The results indicated that the nitrogen-doped bismuth oxide exhibited a higher photocatalytic activity than that of the un-doped bismuth oxide. When 2.0 g/L of nitrogen-doped bismuth oxide was added to 20 mg/L of 2,4-dichlorophenol aqueous solution with initial pH=7, the degradation rate could reach 91.5%. Moreover, the relationship between 2,4-dichlorophenol degradation rate and its initial concentration follows the Langmuir-Hinshelwood model. The variations of total organic carbon and Cl- were also inspected during the photocatalytic reaction. It is suggested that it is beneficial for the mineralization and dechlorination for 2,4-dichlorophenol by using nitrogen-doped bismuth oxide as photocatalyst.

Key words: nitrogen-doped bismuth oxide, photocatalysis, visible-light, dichlorophenol, kinetics

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