镧掺杂磷酸铋光催化降解亚甲基蓝的动力学研究  

Photocatalysis Degradation Kinetics of Methylene Blue by La-doped BiPO_4

作　　者：全玉莲[1,2] 纪献兵[2] 康春莉[1] 

机构地区：[1]吉林大学环境与资源学院,吉林长春130021 [2]中国环境管理干部学院,河北秦皇岛066102

出　　处：《化学试剂》2016年第5期405-408,462,共5页Chemical Reagents

基　　金：河北省教育厅科学技术研究项目(QN20131032);中国环境管理干部学院科研基金项目(ZRZD201601)

摘　　要：以镧掺杂磷酸铋为光催化剂、亚甲基蓝为降解对象,研究多种因素对光催化降解的影响并建立动力学模型。模型的主要参数有亚甲基蓝初始浓度、紫外光照强度、La^(3+)-Bi PO_4投加量。当亚甲基蓝初始浓度较低时,La^(3+)-Bi PO_4对其光催化降解的反应较好地符合表观一级反应动力学特征。表观反应速率常数k'=0.025 4c_0^(-1.796 7)I^(1.148 8)M^(0.656 3),该模型计算值与实验值吻合较好,可用于预测紫外光催化降解低浓度亚甲基蓝的规律。With methylene blue as the target compound, the kinetics model for La-doped BiPO4-photocatalyzed degradation was investigated in suspending system. The main parameters involved in the model were initial concentration of methylene blue, the ultraviolet irradiation, La^3＋ -BiPO4 dosage. The photocatalytic degradation of the methylene blue with La^3＋ -BiPO4 obeyed the apparent first order kinetics when the initial concentration of methylene blue was low. The apparent reaction rate constant followed the equation of k＇ = 0. 025 4% I. 7967I^1. 148 8 M0. 656 3. The calculated value from this model almost agreed with the experimental result. Therefore, the kinetics model could be used to predict the photoeatalytic degradation pattern of methylene blue of low concentration under the UV light.

关 键 词：La^3+-BiPO4 光催化 亚甲基蓝 反应动力学 

分 类 号：O643.3[理学—物理化学]