负载型TiO_2光催化剂对几种有机物的降解实验研究

Study on Several Organic Degradations by Immobilized TiO_2 Photocatalyst

以斜发沸石作为载体,用溶胶-凝胶法制备了TiO2/沸石光催化剂。利用IR、XRD等手段对其进行了表征。以太阳光为光源,光解率为评价指标,对几种不同结构有机物的降解实验表明,TiO2/沸石光催化剂对有机物的降解有明显的选择性。光催化效果在反应初期主要依靠沸石的吸附作用,最终的光解率由有机物的分子量及所带电荷决定,有机物的浓度越大,光解率越低。

By choosing clinoptilolite as immobilization of TiO2, TiO2/clinoptiolite photocatalyst is synthesized by sol-gel method. Photocatalyst is characterized with IR,XRD,etc. Using the sun as the light source to degrade orgainc and photodegration rate as appraisal target,degradation tests to differnent structural organics show that degradation of TiO2/clinoptilolite photocatalyst has obvious selectivity. The photocatalysis effect of initial stages of TiO2/clinoptilolite depends on the sorption of clinoptilolite. The final photodegration rate is determined by molecular weight and electric charge of organic. The higher concentration of solution is, the lower ohotodegration rate is.