CeO_2-TiO_2/[CoW_(12)O_(40)]^(5-)-HTLC的制备及光催化性能  

Preparation and Photo - catalytic Performance of TiO_2 - CeO_2 /[CoW_(12)O_(40) ]^(5-) Pillared Hydrotalcite

作　　者：薛茹君[1] 周敏[1] 陈淑芬[1] 陈春阳[1] 

机构地区：[1]安徽理工大学化学工程学院,安徽淮南232001

出　　处：《安徽理工大学学报（自然科学版）》2013年第1期5-9,共5页Journal of Anhui University of Science and Technology:Natural Science

基　　金：安徽省教育厅自然科学研究基金资助项目(ZD200903);淮南市科技专项基金资助项目

摘　　要：为了克服杂多酸易溶于极性溶剂,较难回收重复使用的缺点,采用共沉淀法制备了镁铝水滑石;并以硝酸根型水滑石作为前体,通过插层组装合成了杂多阴离子[CoW12O40]5--HTLC;再采用微乳液法将CeO2掺杂的TiO2负载到[CoW12O40]5--HTLC上,焙烧后得到CeO2-TiO2/[CoW12O40]5--HTLC光催化剂。采用XRD、FT-IR、SEM-EDS和UV-Vis漫反射光谱等手段对催化剂进行了表征;以甲基橙为模拟污染物,考察了催化剂样品的光催化性能。实验结果表明:CeO2掺杂TiO2复合粒子在可见光区吸光性能高于TiO2;CeO2掺杂TiO2与杂多阴离子[CoW12O40]5-有协同光催化作用,CeO2-TiO2/[CoW12O40]5--HTLC光催化剂对可见光的吸收大大增强。经模拟日光照射2 h,15%(CeO2-TiO2)/5%[CoW12O40]5--HTLC催化剂对甲基橙的脱色率达到93%。MgAl- hydrotalcite was prepared by coprecipitation. With the NO3- -HTLC as precursor, hetero- polyanion [CoW_12 O_40 ]^5- _ HTLC was synthesized by intercalating assembly. Moreover, CeO2 doped TiO2 was loaded on the surface of the pillared hydrotalcite via microemulsion method. After calcination, CeO2 -TiO2/ [ CoW_12 O_40 ]^5- _ HTLC photocatalyst was obtained at last. The catalyst was characterized by means of XRD, l^r -IR, SEM -EDS and UV -Vis diffuse reflectance spectroscopy. With methyl orange as the aim pollutant, the photocatalytic performance of the catalyst sample was investigated under simulated sunlight irradiation. The ex- perimental results show that： the absorption performance for visible light of the CeO2 -TiO2 composite particles was higher than that of TiO2. There is synergistic photocatalysis between the CeO2 - TiO2 and heteropolyanion [CoW_12 O_40]^5-. The absorption for visible light of the CeO2 -TiO2/ [CoW_12 O_40]^5-- _ HTLC photocatalyst is greatly enhanced. Under simulating sunlight irradiation for 2 h, the decolorization degree for methyl orange of 15% （ CeO2 - TiO2 ）/5% [CoW_12 O_40]^5- _ HTLC catalyst reaches 93%.

关 键 词：CeO2-TiO2/[CoW12O40]5--HTLC 光催化剂 制备 性能 

分 类 号：O643[理学—物理化学] TQ426[理学—化学]