TiO2/BiNbO4复合光催化剂的制备及降解气相苯性能

摘要

BiNbO4 was prepared by solid phase reaction method. TiO2/BiNbO4 composite photocatalysts were obtained by coupling TiO2 and BiNbO4. The photocatalytic 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 Spectrocopy(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 TiO/BiNbO4. After coupling of TiO2 and BiNbO4 the photogenerated electrons and holes are effectively separated,thus the photocatalytic activity is enhanced.%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％ TiO/BiNbO4紫外光照5h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.