【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.更多还原

【Abstract】 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 Cu2+,Zn2+,Al3+,Mg2+) 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 Cu2+ accelerated the production of superoxide radical.Similar results were also found in the case of visible light irradiation.更多还原