Keggin型铬取代杂多阴离子/阴离子交换树脂的可见光催化性能  

Visible Light Catalysis of Keggin-type Cr-Substituted Heteropolyanion/Anion Exchange Resin

作　　者：李梦婷[1] 刘海城[1] 曾星[1] 徐孝南 邹晓梅[1] 华英杰[1] 王崇太[1] 

机构地区：[1]海南师范大学化学与化工学院,海口571158

出　　处：《应用化学》2014年第8期965-970,共6页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金资助项目(21161007);海南省国际科技合作项目(2012-GH004;KJHZ2014-08);海南省重点科技计划项目(ZDXM20130088;ZDXM2014099);国家大学生创新项目(201211658041)~~

摘　　要：将Keggin型铬取代磷钨杂多阴离子PW11O39Cr(Ⅲ)(H2O)4-(PW11Cr)负载于弱碱性阴离子交换树脂D301R表面,制备了固体光催化剂PW11Cr/D301R,并以模型污染物罗丹明B(RhB)的降解为探针评估了该催化剂的可见光催化活性,讨论了光催化反应机理,同时考察了催化剂剂量、溶液pH值和溶液中常见离子对RhB可见光催化降解反应的影响以及催化剂的稳定性。实验结果表明,当PW11Cr/D301R的剂量为100 mg时,10μmol/L RhB水溶液暴露在200 W金卤灯下进行照射,RhB完全降解所需的时间仅为30 min,比PW11Cr均相体系缩短了3倍;反应180 min总有机碳(TOC)去除率约为84%。催化剂剂量、溶液pH值和溶液中存在的Cl-、SO2-4和PO3-4对RhB光催化降解反应的速率均有一定影响。催化剂循环实验显示经循环使用7次后催化剂的活性几乎没有损失。A solid photocatalyst of Keggin-type Cr （Ⅲ） substituted heteropolytungstates immobilized on the surface of alkalescent anionic exchange resin D301R （PW11 Cr/D301R） was prepared. Its visible light photocatalytic activity was assessed through the degradation of a model pollutant rhodamine B （RhB）. The photocatalysis mechanism was discussed and influences of the PW. Cr/D301R dosage, the solution pH and the common anions existing in solution on the photocatalytic degradation rate of RhB were also examined. The time required to achieve a complete degradation of RhB is only 30 min in the presence of 100 mg PWll Cr/D301R when a solution containing 10 μmol/L RhB is exposed to irradiation of the 200 W metal halide lamp. This process is three times faster than that in the PW11Cr homogeneous system. Approximate 84% of the total organic carbon（TOC） removal is reached at 180 min. The PW11Cr/D301R dosage, the solution pH, and existing anion such as Cl^-, SO4^2- or PO4^3- all have an obvious influence on the photocatalytic degradation rate of RhB. There is no obvious lost of photocatalytic activity of PW11 Cr/D301R after seven repetitive uses.

关 键 词：铬取代杂多阴离子 可见光催化剂 罗丹明B降解 总有机碳 D301R树脂 

分 类 号：O643.3[理学—物理化学]