Abstract: The technique of photocatalytic oxidation was used in the treatment of simulated wastewater with benzamide as a model pollutant.The photocatalytic oxidation performance and kinetics of the simulated organic wastewater in a circulating slurry photocatalytic reactor was investigated.The effects of operation conditions, such as dosage of photocatalyst, illumination time, initial benzamide concentration, pH value, anions and cations in wastewater, on the photocatalytic oxidation performance were discussed.The results showed that the application of photocatalytic oxidation to the treatment of wastewater was feasible and efficient, but it was affected by the operation conditions.There existed optimum value of the dosage of catalyst, initial benzamide concentration and pH value for the photocatalytic oxidation performance.H₂PO^-₄,Cl^-, Cu²⁺ and Al³⁺ showed obvious inhibition to the photocatalytic oxidation.Compared with the results obtained from a stirred slurry reactor and a bubble column slurry reactor, the circulating slurry photocatalytic reactor provided not only excellent blend of catalysts and reactants, but also high efficiency of UV light.It could increase the throughtput of treatment and reduce the dosage of catalyst.The kinetics study of the photocatalytic oxidation with different photocatalyst loadings and initial concentrations showed that the photocatalytic degradation rate followed pseudo-first order kinetics with respect to benzamide concentration,and the surface reaction rate constant (k₀)and adsorption equilibrium constant(K_TiO2) of TiO₂ catalyst were 0.0279 min^-1 and 17.99 L•g^-1 respectively.

摘要： 采用循环式浆态光催化反应器对苯甲酰胺模拟废水光催化氧化特性和动力学进行了研究，系统地考察了操作条件对模拟污染物光催化降解的影响，并与搅拌式和鼓泡床式浆态光催化反应器中苯甲酰胺的降解效果进行对比.结果表明，循环式浆态光催化反应器中光催化剂的用量、污染物的初始浓度和初始pH值对模拟污染物光催化降解性能的影响存在适宜值;体系中H₂PO^-₄、Cl^-、Cu²⁺、Al³⁺对其光催化降解过程有明显的抑制作用.与传统的搅拌式和鼓泡床式浆态光催化反应器相比，循环式浆态光催化反应器中催化剂和废水的混合效果较好，光利用率高，较大程度上减少催化剂的用量和提高废水处理能力.同时，对不同催化剂的用量和污染物初始浓度下的光催化氧化反应动力学研究表明，此过程符合拟一级动力学，催化剂表面反应速率常数k₀和催化剂吸附平衡常数K_TiO2分别为0.0279 min^-1和17.99 L•g^-1.