TiO_2/BiNbO_4复合光催化剂的制备及降解气相苯性能  

Composite Photocatalyst TiO_2/BiNbO_4: Preparation and Degradation Performance for Gas Phase Benzene

作　　者：吴大旺[1,2] 李硕[2,3] 张秋林[2] 陈耀强[2] 龚茂初[2] 

机构地区：[1]黔南民族师范学院化学与化工系,都匀558000 [2]四川大学化学学院,成都610064 [3]烟台大学化学生物理工学院,烟台264001

出　　处：《无机化学学报》2012年第7期1383-1388,共6页Chinese Journal of Inorganic Chemistry

基　　金：贵州省教育厅自然科学基金(No.2005221);国家自然科学基金(No.20773090)资助项目

摘　　要：采用固相反应法制备出BiNbO4,将其与TiO2耦合,得到TiO2/BiNbO4复合光催化剂。考察了催化剂在紫外光照射下催化降解气相苯的活性。结果表明,TiO2与BiNbO4耦合后催化活性明显提高,其中36%TiO2/BiNbO4紫外光照5 h对苯的降解率是P-25的3.7倍。紫外-可见漫反射谱(UV-Vis DRS)、XRD、XPS和低温氮吸附-脱附等表征结果表明TiO2与BiNbO4的能级匹配,二者之间存在能带协同效应。耦合后的TiO2/BiNbO4的光生电子和空穴能有效分离,从而提高了催化剂催化活性。BiNbO4 was prepared by solid phase reaction method. TiO2/BiNbO4 composite photocatalysts were obtained by coupling TiO2 and BiNbO4. The photoeatalytic degradation for gas benzene was performed under UV irradiation. The results show that the catalytic activity is significantly enhanced by the coupling of TiO2 and BiNbO4. The catalytic activity of 36% TiO2/BiNbO4 is 3.7 times that of P-25. The characterization results of UV- Vis Diffused Reflectance Spectroeopy（UV-Vis DRS）, XRD, XPS and low temperature adsorption-desorption reveal that the energy level of TiO2 matches with BiNbO4, and there is synergistic effect for the coupled catalysts of TiO2/BiNbO4. After coupling of TiO2 and BiNbO4, the photogenerated electrons and holes are effectively separated,thus the photocatalytie activity is enhanced.

关 键 词：TiO2/BiNbO4 光催化 降解 气相苯 

分 类 号：O643.36[理学—物理化学] O614.411[理学—化学]