Abstract:

Ce/TiO₂ nanoparticle has been prepared by sol-gel method,using tetrabutyl titanate as main raw materials, and Fe(OH)₃/Ce/TiO₂ composite nano-photocatalysts has been prepared by homo-precipitation coating method with-out being subjected to any high temperature treatment. The structure and property of the photocatalysts are charac-terized with XRD,BET and UV-Vis. The photocatalytic activity of this photocatalyst is studied,using 3BS as organic pollutant model compound. The results indicate that compared with pure TiO₂,the crystalline structure of TiO₂ has basically not been changed before or after modification. Also,the Fe(OH)₃/Ce/TiO₂ photocatalyst under visible light,has stronger adsorbing capacity,larger specific surface area and the photo-catalytic capacity of Red 3BS is higher to a great degree. The influences of photo-catalyst dosage,solution pH value,reaction time,and some other factors on 3BS degradation rates are investigated by orthogonal tests. The experimental results show that under sunshine irradiation,the optimum conditions for the catalytic degradation of the dye wastewater are as bellow:catalyst dosage is 0.8-1.0 g/L,pH=3,and degradation time 90 min. Under these conditions,the degradation rate of 3BS by composite photocatalysts is higher than 90% and COD removing rate is about 85%.

Key words: photocatalys, homo-precipitation coating method, visible light response, active red 3BS

摘要：

以钛酸丁酯为主要原料,用溶胶-凝胶法制备了Ce/TiO₂复合粒子,并采用均匀沉淀包覆法,不经高温煅烧处理,制备出了 Fe(OH)₃/Ce/TiO₂复合型光催化剂。通过XRD、比表面、UV-Vis反射等对光催化剂结构进行了表征,并以染料活性红3BS为有机污染物的模型化合物研究其光催化活性。结果表明,与纯TiO₂相比,在改性前后晶形基本不变,Fe(OH)₃/Ce/TiO₂光催化剂在可见光区吸收能力增强,比表面增大,降解3BS的光催化能力有较大提高。用正交实验探讨了催化剂用量、溶液pH、降解时间等因素对3BS降解率的影响,实验得出在太阳光照射下,催化降解该染料废水的最佳条件:催化剂用量为0.8~1.0 g/L,pH为3,降解时间为90 min,在此条件下复合光催化剂对染料3BS的降解率为90%以上,COD去除率约为85%。

关键词: 纳米光催化剂, 均匀沉淀包覆法, 可见光响应, 活性红3BS

CLC Number: 

• X703.1