陶粒负载纳米TiO_2光催化降解水中腐殖酸

Degradation of humic acid in aqueous solution by catalysis of nanosized TiO_2 supported on haydite

采用溶胶-凝胶法制备了以陶粒为载体的新型、高光催化活性的复合光催化剂TiO2/陶粒,使用XRD、TG-DTA、FT-IR进行表征;以腐殖酸为目标降解物,探讨了光催化氧化降解腐殖酸的规律,考察了催化剂投加量、腐殖酸溶液初始浓度、初始pH值、光强、反应时间、焙烧温度等因素对腐殖酸去除效果的影响.结果表明,在700℃温度下焙烧的催化剂具有最大光催化活性;腐殖酸的去除率随腐殖酸初始浓度和pH值的降低而增大;催化剂经重复使用几次后,仍具有较高的光催化性能.

This paper presented the results of photocatalysis degradation of humic acid by nanosized TiO2 supported on haydite.Catalysts are prepared by sol-sel method,and sintered in electrical resistance furnace.The XRD,TG-DTA,FT-IR are also used to characterize the catalysts.The photocatalysis capability of the catalysts and influencing factors of photocatalysis degradation are studied,such as the catalyst dosage,the initial concentration and the pH value of humic acid solution and the experiment of the catalyst repeated used.The photocatalysis capabilities of the catalysts at different sintered temperature are compared.The optimum sinter temperature is found for preparing the catalyst.The results indicates that when the catalyst is sintered at 700℃,it has the best property of photocatalysis;as the initial concentration and the pH value of humic acid solution decreases,the removing rate of humic acid increases.Besides,the catalyst showes good photocatalysis capability after repeated used.