以钛酸四丁酯(TBOT)为钛源,硝酸镧为镧源,尿素为氮源,采用溶胶-凝胶法合成了La-N共掺杂的TiO2光催化剂,并探究了其对孔雀石绿氧化降解的性能.结果表明该反应遵循一级动力学,得到动力学模型;其中外加偏电压的反应分级数(0.935 8)高于pH的反应分级数(0.611 9)以及初始浓度的反应分级数(0.335),表明外加偏电压对反应的影响最大.模型值与实验值吻合良好(R2为0.910～0.996 1),说明该反应动力学模型能较好地描述光电催化降解孔雀石绿过程. La-N co-doped TiO2 photocatalyst was synthesized by sol-gel method using tetrabutyl titanate (TBOT) as titanium source, lanthanum nitrate as lanthanum source and urea as nitrogen source. The results showed that the reaction followed the first order kinetics and the kinetic model was obtained. The partial reaction voltage (0.935 8) was higher than that of pH (0.611 9) and the initial reaction grade (0.335), indicating that the applied bias voltage has the most significant effect on the reaction.The model values ​​are in good agreement with the experimental data (R2 is 0.910 ~ 0.996 1), indicating that the reaction kinetic model can better describe the degradation of malachite green by photoelectrocatalysis.