紫外和可见光照射下金属离子对TiO_2/沸石光降解罗丹明B的催化性能影响  

The Effect of Metal Ions on Photodegradation of RhB on TiO_2/zeolite Under UV and Visible Light Irradiation

作　　者：李静谊[1] 刘丽娜[1] 斯琴高娃[1] 白图雅[1] 

机构地区：[1]内蒙古大学化学化工学院,内蒙古呼和浩特010021

出　　处：《内蒙古师范大学学报（自然科学汉文版）》2008年第2期219-223,共5页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20567002);教育部春晖计划(Z2004-2-15030);内蒙古教育厅项目(NJ04093);内蒙古大学"513人才计划"资助项目;内蒙古大学科研启动基金资助项目

摘　　要：以钛酸四丁酯为钛源,采用溶胶-凝胶(Sol-Gel)法将TiO2负载到天然斜发沸石上,制备了TiO2/沸石催化剂.在紫外光和可见光照射下,以罗丹明B的降解率及COD去除率评价反应降解活性,同时用电子顺磁共振法(EPR)表征催化剂体系.以TiO2/沸石及P25为催化剂,分别在溶液中加入金属离子Cu2+、Zn2+、Al3+、Mg2+,考察其对光降解罗丹明B的影响.结果表明,在紫外光或可见光照射下,金属离子的加入阻碍光降解过程,Cu2+的加入促进超氧自由基的生成.另外,在可紫外光照射下,金属离子的加入还阻碍羟基自由基的生成.With tetrabutyl titanate the titanium source, TiO2 was loaded to the natural clinoptilolite and the TiO2/zeolite catalyst was prepared by using the sol-gel method. Under UV and visible light irradiation, its photodegradation activity was evaluated by the degradation rate of RhB and the change rate of COD. The catalytic system was characterized by EPR method. TiO2/zeolite and P25 were applied as catalysts. The metal ions （such as Cu^2＋ ,Zn^2＋ ,Al^3＋ ,Mg^2＋） were added to the solution and their effect on the photodegradation of RhB was investigated. The experimental results showed that the addition of metal ions blocked the photodegradation of RhB and hindered the production of hydroxyl radical under UV light irradiation. The addition of Cu^2＋ accelerated the production of superoxide radical. Similar results were also found in the case of visible light irradiation.

关 键 词：紫外光 可见光 金属离子 TiO2/沸石催化剂 

分 类 号：O644[理学—物理化学]