以自制的掺Fe³⁺锐钛矿型TiO₂(A-TiO₂)为光催化剂,以酸性刚果红为降解对象,研究酸性刚果红的初始浓度C₀、催化剂用量m和掺铁量χ等因素对自制A-TiO₂可见光催化降解反应动力学方程的影响和光催化剂对酸性刚果红的吸附性能。结果表明:在40W白炽灯照射下,当C₀=20mg/L、m=0.6g/L(pH=6)、χ=1.2%(摩尔分数)、室温(18℃)下反应t=56min时,酸性刚果红的降解率最大D=92.7%。酸性刚果红的光催化降解过程符合一级反应动力学方程,于上述最佳条件下其表观反应速率常数k达到最大,为0.0404min^-1。自制的光催化剂对C₀分别为20、30和40mg/L的酸性刚果红吸附率E随C₀增大而减小,110min达到吸附平衡,对20mg/L酸性刚果红的吸附率E达94.6%。D和E成正比。

Fe³⁺-doping anatase TiO₂ (i.e.A-TiO₂) photo-catalyst was prepared via hydrothermal method.The main influence factors including the acid Congo red's initial concentration C₀,TiO₂ dosage m,amount χ of Fe³⁺-doping in A-TiO₂ were investigated for the kinetic equation of Fe³⁺-doping A-TiO₂ under visible light,and the adsorption property was also studied under dark condition.The results showed that the degradation rate D=92.7% of acid Congo red was the maximum under follow optimal conditions:acid Congo red's initial concentration C₀=0mg/L(pH=6),catalyst dosage m=0.6g/L,amount of Fe³⁺-doping χ=1.2%(molar fraction),and irradiated by 40W filament lamp for t=56 min at room temperature (18℃).The kinetic procedure of photo-catalytic degradation of acid Congo red was corresponded to the first-order kinetics equation,the degradation observed rate constant k(0.0404min^-1) achieved the maximum under the above optimum condition.The adsorption rate E of as-prepared photo-catalyst on acid Congo red was decreased with the increase of C₀,when t=110min,the adsorption equilibrium was reached,and for 20mg/L acid Congo red solution,the adsorption rate E was 94.6%.D was proportional to E.