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Keggin型铜取代磷钨杂多阴离子可见光催化降解罗丹明B

吴春燕,刘希龙,沈国英,黄文施,茅丹,华英杰,王崇太*   

  1. (海南师范大学化学与化工学院 海口 571158)
  • 收稿日期:2011-11-01 修回日期:2012-01-20 出版日期:2012-09-10 发布日期:2012-09-10
  • 通讯作者: 王崇太，教授; Tel:0898-65736636; E-mail:wct581@sina.com; 研究方向：光、电催化及其在能源、环境中的应用
  • 基金资助:
    国家自然科学基金（20963003;21161007）资助项目，海南省重点科技项目（090803），吉林省科技发展计划项目(20090595)，海南省教育厅高等学校科研基金项目 (HjKj2011-24)，海南师范大学开放实验室项目（kfsy11017），国家大学生创新性实验计划（101165811）

Visible Photocatalytic Degradation of Rhodamine B Using Copper-Substituted Tungstophosphate Heteropolyanion

WU Chunyan, LIU Xilong, SHEN Guoying, HUANG Wenshi, MAO Dan, HUA Yingjie, WANG Chongtai*   

  1. (School of Chemistry and Chemical Engineering,Hainan Normal University,Haikou 571158,China)
  • Received:2011-11-01 Revised:2012-01-20 Published:2012-09-10 Online:2012-09-10
  • Contact: guoying

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1440

被引次数

10 | 5

摘要： 以Keggin型铜取代杂多阴离子PW11O39Cu(Ⅱ)(H2O)5-[PW11Cu]为可见光催化剂，有机染料罗丹明B(RhB)为模型污染物，研究了在可见光照射下PW11Cu对RhB的可见光催化降解作用，提出了PW11Cu可见光催化作用的反应机理，同时考察了RhB初始浓度、PW11Cu初始浓度和溶液pH值对RhB光催化降解速率的影响。 实验结果表明，含有15.6 μmol/L PW11Cu+10 μmol/L RhB的水溶液在可见光照射下反应80 min，RhB的降解率达100%，总有机碳去除率约33%。 RhB的可见光催化降解服从准一级动力学方程，在RhB初始浓度为20、30和40 μmol/L的情况下，其表观一级速率常数分别为3.1×10-2、2.0×10-2和1.5×10-2 min-1。

关键词: 铜取代杂多阴离子, 均相光催化, 罗丹明B降解, 总有机碳

Abstract: Using Keggin-type copper-substituted heteropolyanion PW11O39Cu(Ⅱ)(H2O)5-(PW11Cu) as a visible photocatalyst, and organic dye Rhodamine B(RhB) as a model pollutant, this work reports a study on the visible photocatalysis of PW11Cu towards RhB degradation in aqueous solution under visible light irradiation. A visible photocatalysis mechanism is proposed. At the same time, influences of the initial RhB concentration, the initial PW11Cu concentration and the solution pH on the degradation rate of RhB are also examined. Experimental results show that 100% of RhB degradation is reached at 80 min under visible light irradiation of a solution containing 15.6 μmol/L PW11Cu and 10 μmol/L RhB, and a total organic carbon removal is about 33%. The visible photocatalytic degradation of RhB follows the quasi-first order kinetic regime and the observed rate constant is estimated to be 3.1×10-2, 2.0×10-2 and 1.5×10-2 min-1 corresponding to the initial RhB concentration of 20, 30 and 40 μmol/L, respectively.

Key words: copper-substitutes heteropolyanion, homogeneous photocatalysis, Degradation of Rhodamine B, total organic carbon

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