微波辅助光催化降解阿特拉津的表观动力学

以内分泌干扰物阿特拉津为目标物,建立循环流化床微波辅助光催化体系,研究其微波辅助光催化降解规律。表观动力学研究发现,当阿特拉津初始浓度较低时,其在微波辅助光催化体系中的降解符合表观一级反应动力学特征。降解反应速率常数与阿特拉津初始浓度呈负线性相关,与紫外光强呈正线性相关,与催化剂浓度呈抛物线性相关。表观反应速率常数kobs=3.95×10-4c-0.27030I1.2224W0.3283,该模型计算值与实验值吻合较好,平均相对偏差仅为0.5%,可用于预测微波辅助光催化降解低浓度有机污染物的反应规律。

Apparent kinetics study on degradation of atrazine by microwave-assisted photocatalytic process

The degradation pattern of typical endocrine disruptor atrazine in microwave-assisted photocatalytic process was studied using a circulating fluidized bed photo-reactor.According to the apparent kinetics study,the degradation of atrazine in microwave-assisted photocatalytic process obeyed the apparent first order kinetics when the initial concentration of atrazine was low.The reaction rate constant showed a negative linear correlation with the initial concentration of atrazine,while it was linearly related to the ultraviolet intensity and parabolic related to the catalyst dosage.Furthermore,the apparent reaction rate constant followed the equation of k_obs=3.95×10^-4c₀^-0.2703I^1.2224W^0.3283 after linear regression fitting of experimental data.The calculated value from this model almost agreed with the experimental result,with a mean standard deviation of 0.5%.Therefore,the kinetics model could be used to predict the degradation pattern of organic pollutant of low concentration in microwave-assisted photocatalytic process.