负载型纳米TiO_2/AC对偶氮染料的光催化降解研究

Photocatalytic degradation of azo dyes using nanometer-sized TiO_2 photocatalyst immobilized on activated carbon

以钛酸四丁酯和粒状活性炭(AC)为主要原料,采用溶胶凝胶浸渍法制备出负载型纳米TiO2/AC催化剂。在流化床反应器中分别对2种典型的偶氮类染料橙黄G、活性艳红X3B模拟废水进行了光催化降解研究,探讨了pH值、外加氧化剂对光催化降解率的影响,并对催化剂进行了回收再生利用试验.结果表明,TiO2/AC催化剂具有良好的光催化活性、吸附特性及可再生性,60min后对2种染料反应的光催化降解率分别可达到99.71%和97.12%,反应180min后的TOC去除率分别达到81.54%和81.99%;反应后TiO2/AC催化剂回收率大于95%,经焙烧再生后对橙黄G反应60min的光催化降解率仍高达95.93%.

Using tetrabutyl titanate and granular activated carbon as the raw material, nanometer-sized TiO2 photocatalyst immobilized on activated carbon （TiO2/AC）was prepared by sol-gel-dip method. The photocatalytic degradation of 2 azo dyes orange G and reactive brilliant red X-3 B in simulated wastewater were studied in a fluidized photoeatalytic reactor. The influences of pH value, additive oxidants to the photocatalyie degradation rate were investigated. The recovered efficiency and catalytic activity of the regenerated photocatalyst was also tested. The results indicated that TiO2/AC photocatalyst showed high photocatalytic activity, absorbability and regenerating property. The photocatalytic degradation rates of orange G and reactive brilliant red X-3B were achieved 99.71% and 97.12% in 60mins, the TOC removal rates were achieved 81.54% and 81.99% after 180mins reaction respectively. The recovery rate of TiO2/AC photocatalyst was more than 95% , and the photocatalytic degradation rates of orange G was achieved 95.93% by calcination regenerated TiO2/AC especially.