Yb-La共掺杂TiO_2光催化降解炼油废水

采用溶胶凝胶法制备了镱镧共掺杂TiO2(Yb-La/TiO2)催化剂,将其用于光催化降解炼油废水,优化了光催化反应条件,对反应动力学进行了研究,并利用XRD,IR,BET等手段对催化剂的结构进行了表征。实验结果表明,Yb-La/TiO2光催化降解炼油废水的最佳工艺条件为:催化剂用量4.0 g/L,体系pH=5,紫外光照射时间3 h。在此条件下,炼油废水的COD降解率(η)可达90.90%。光催化降解反应符合一级反应动力学特征,其反应速率方程为:ln1/(1-η)]=0.808t-0.169 4(t为时间)。表征结果显示,镧镱共掺杂TiO2降低了颗粒粒径,增大了比表面积,提高了催化剂的活性,镧镱共掺杂具有协同效应。

Photocatalytic Degradation of Refinery Water over Yb and La Co-Doped TiO2

A photocatalyst,ytterbium and lanthanum co-doped TiO2(Yb-La/TiO2) was prepared by a sol-gel method and characterized by means of XRD,IR and BET techniques.The photocatalytic degradation of refinery water was carried out over the Yb-La/TiO2 photocatalyst under ultraviolet light and the photocatalytic degradation conditions were optimized.The kinetics of the degradation reaction was studied.The results show that under the optimum reaction conditions for the degradation over Yb-La/TiO2 photocatalyst of Yb-La/TiO2 catalyst dosage 4.0 g/L,system pH 5 and lighting time of ultraviolet light 3 h,the COD removal rate(η) for the refinery water can reach 90.90%.The photocatalytic degradation conforms to first-order reaction kinetics,and its reaction rate equation is: ln1/(1-η)]=0.808t-0.169 4.Due to co-doping Yb and La,the particle size of the catalyst is lowered and its specific surface area increases,which leads to the improvement of the catalyst activity.The doping for the catalyst showed a synergetic effect.