摘要
以钛酸四丁酯为原料,采用溶胶-凝胶法制备TiO2光催化剂,然后浸渍法制备出H3PW12O40/TiO2复合型光催化剂,并运用XRD、SEM、FT-IR和DRS对催化剂进行表征和分析.研究了可见光光照下H3PW12O40/TiO2对孔雀石绿降解的光催化活性,考察了浸渍量、催化剂用量、底物浓度、pH值对光催化降解率的影响.实验表明,在pH=5条件下,H3PW12O40/TiO2催化剂用量为0.3g.L-1,浓度为10mg·mL-1的孔雀石绿溶液在2L·min-1曝气、300W可见光下光照4h后光催化降解率为78%,比TiO2光催化活性提高了24%.
A composite H3PW12O40/TiO2 photocatalyst was prepared by impregnating H3PW12O40 onto nanosized TiO2,which was prepared by a sol-gel method with tetrabutyl titanate.The composite photocatalyst was characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,Fourier transform infrared spectrometry（FT-IR）and UV-Vis diffuse reflectance spectroscopy（DRS）.The photocatalytic activity of the catalyst toward decomposing malachite green（MG）was studied under visible-light irradiation.The influences of several operating parameters,such as impregnation volume,the dosage of catalyst,initial dye concentration,and pH,on the photocatalytic degradation of MG were investigated.The degradation rate of MG with H3PW12O40/TiO2 was 78% after being treated for 4 h under 300 W visible-light irradiation at pH 5,with 2 L·min^-1 aeration using 0.3 g·L^-1 H3PW12O40/TiO2 as the photocatalyst,which was higher than that when using TiO2 photocatalyst alone.
出处
《环境科学学报》
CAS
CSCD
北大核心
2010年第8期1642-1648,共7页
Acta Scientiae Circumstantiae
基金
教育部归国留学人员科研启动基金
江苏大学人才基金(No.06JDG030)~~
