摘要
考察了不同酸、溶剂以及不同比例水制备的溶胶对TiO2光催化剂活性的影响进行了分析.结果表明,在盐酸、醋酸、草酸和甲基丙烯酸中,采用醋酸所得催化剂活性最好;在乙醇、正丙醇、异丙醇、正丁醇4种溶剂中,采用正丁醇作溶剂所得催化剂活性最好;最佳溶胶制备条件为钛酸丁酯∶水∶冰醋酸:正丁醇=1∶3∶8∶10(摩尔比);最优条件下制备的TiO2催化剂平均粒径为15·19nm,晶型为锐钛矿,对小于320nm的紫外光有良好的吸收;利用研制的TiO2光催化剂降解多菌灵废水,反应1h,COD去除率在35%左右;对9·606mg·l-1的苯酚溶液光降解半衰期为4·6min.
Effects of acids, dissolvent and their loading as well as water in preparation of sol on the photocatalytic activity of TiO2 were studied. Results indicate that the acetic acid is the optimal acid compared with hydrochloric acid, ethanedioic acid and methacryl acid, and n-butanol is the optimal dissolvent compared with ethanol, normal propyl alcohol and isopropanol. For the preparation of sol, the optimal molar scale of tetrabutylorthotitanate, water, acetic acid and n-butanol are 1, 3, 8 and 10. When the sol is heated for 1h at 500℃, the resulting crystalline form of TiO2 is anatase with a mean particle size of 15.19 nm, and its absorbance is good for the light with wave length less than or equal to 320 nm. Photo - degradation experiments with the optimal TiO2 show that the half-life time of phenol （9. 606 mg ·l^-1） is 4. 6 min and COD removal of carbendazol is 35 % from initial content of 3700 mg · l^-1
出处
《环境化学》
CAS
CSCD
北大核心
2005年第5期525-527,共3页
Environmental Chemistry
基金
国家863计划项目(2002AA601250)
高等学校博士学科点专项科研基金(20020284044)
海南省自然科学基金(20201)
