纳米GO/TiO_2对饮用水中腐殖酸的光催化研究

本文分别用水热法和溶胶法制备了GO/TiO_2复合材料,对饮用水中常见的腐殖酸进行光催化降解研究。实验结果表明,GO-TiO_2对光的吸收利用率和吸附催化效果都好于TiO_2;暗态吸附实验中,GO/TiO_2对腐殖酸的吸附率分别达到13%～18%左右,20～30min左右能达到稳定;对10mg/L和25mg/L的腐殖酸的光解率分别达到87%和94%;制备方法比较来看,水热法制成的催化材料催化速度优于溶胶凝胶法制成的材料。

TiO2/Graphite oxide(GO) composite materials are synthesized,by which photocatalytic degradation of humic acid in drinking water was studied. Experimental results show that The absorption efficiency of light and adsorptive catalysis of TiO2-GO is better than that of TiO2;When the initial concentrations of 10 and 25 mg/L humic acid were catalyzed by GO/TiO2,the adsorption rate reached about 13% and 18% respectively and can be maintained in 20~30 min. In subsequent photocatalytic degradation experiments,photodegradation rate is about 87%and 94% about 1 h and 3.5 h, respectively. There was no significant difference in photodegradation effect by catalysts made by hydrothermal method and sol-gel method on 10 mg/L humic acid solution. But on 25 mg/L humic acid solution, the catalytic rate of catalysts made by hydrothermal method is significantly superior catalysts made by solgel method.