凹土负载TiO_2光催化剂降解印染废水的研究

Attapulgite of Loaded TiO_2 to Degradation of Direct Dark Blue

通过溶胶-凝胶法制备纳米TiO2,并将其负载在凹土上,制备出不同TiO2负载量的TiO2/凹土光催化剂,用XRD、SEM对光催化剂进行表征。用制备的光催化剂处理直接深蓝模拟印染废水,通过改变TiO2/凹土光催化剂投加量、pH值,考察TiO2/凹土光催化剂对直接深蓝模拟印染废水的脱色情况,同时考察了TiO2/凹土光催化剂的重复使用能力。结果表明:负载量25%,催化剂用量8 g/L,pH=3时处理效果最佳;重复使用7次,其脱色率仍高达91.30%。

TiO2/attapulgite photocatalyst loaded with different TiO2 was prepared through attapulgite loading TiO2 nanopowder synthesized by Sol-gel,the composition and crystal phase of TiO2/Attapulgite was analysed taking advantage of XRD and SEM.Using the samples of TiO2/attapulgite prepared as photocatalysts,the effects of some factors,such as dosage of catalyst,and pH values on the photodegradation of direct dark blue are discussed and the feasibility of repeated utilization is confirmed.The experimental results show that the maximum removal rate is achieved when TiO2 loading is 25%,the amount of TiO2/attapulgite photocatalyst is 8 g/L,the pH is 3,and the decolorization ratio is 91.30% when used 7 times.