纳米CuO/CoFe_2O_4-TiO_2模拟太阳光降解亚甲基蓝的性能  

Research on the properties of nano-catalyst CuO/CoFe_2O_4-TiO_2 for photocatalytic degradation of methylene blue under visible light

作　　者：陈浩[1,2] 蒋金芝[1] 阎建辉[1,2] 张丽[2] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]湖南理工学院化学化工系,湖南岳阳414000

出　　处：《工业催化》2011年第5期64-69,共6页Industrial Catalysis

基　　金：湖南省自然科学基金(05JJ30018)

摘　　要：采用溶胶-凝胶法制备CuO/CoFe_2O_4粒子,并与P25复合制备纳米催化剂CuO/CoFe_2O_4-TiO_2。通过模拟太阳光催化降解亚甲基蓝,对催化剂活性进行研究,采用SEM、TEM、XRD和UV-Vis DRS方法对催化剂进行表征。结果表明,CuO/CoFe_2O_4粒子均匀分散在P25微粒表面,平均粒径为60 nm。并考察催化剂类型、CuO/CoFe_2O_4-TiO_2中P25含量、光照强度、焙烧温度和亚甲基蓝的预吸附率等条件对降解过程的影响,发现催化活性较高的催化剂是质量分数70%的P25与CuO/CoFe_2O_4在550℃复合,催化性能较佳,经250 W的氙灯照射60 min,亚甲基蓝脱色率达99%。CuO/CoFe2O4 particles were prepared by solgel method and CuO/CoFe2O4TiO2 composite catalysts were synthesized by CuO/CoFe2O4 and Degussa P25.Photocatalytic activity of asprepared nanocomposites was investigated using the degradation of methylene blue aqueous solution under visible light irradiation as the probe reaction.The catalysts were characterized by XRD,SEM,TEM and UV-Vis DRS.The results showed that CuO/CoFe2O4 nanoparticles deposited on the surface of Degussa P25 nanopariticles were dispersed well and the average size was about 60 nm.The influence of catalyst types,P25 contents in CCFP（CuO/CoFe2O4 doped with P25）,light intensity,calcination temperature and methylene blue adsorption rate was studied.The results indicated that the catalyst CCFP-70 doped with 70wt% P25 for degradation of methylene blue exhibited better activity than that of pure TiO2 and P25.The degradation rate of methylene blue reached 99% under 250 W xenon lamp for 60 minutes.

关 键 词：催化化学 纳米催化剂CuO/CoFe2O4-TiO2 光催化降解 亚甲基蓝 

分 类 号：TQ034[化学工程] TB383[一般工业技术—材料科学与工程]