纳米二氧化钛光催化降解染料废水动力学研究  

Study of dynamics and photocatalytic degradation of dyeing wastewater by nano-titanium dioxide

作　　者：张建斌[1,2] 田海锋[3] 查飞[3] 左国防[1,2] 雷新有[1,2] 唐惠安[1,2] 

机构地区：[1]天水师范学院,生命科学与化学学院,甘肃天水741001 [2]天水师范学院新型分子材料设计与功能重点实验室,甘肃天水741001 [3]西北师范大学化学化工学院,甘肃兰州730070

出　　处：《应用化工》2014年第8期1369-1372,共4页Applied Chemical Industry

基　　金：国家自然科学基金项目(21071110);天水师范学院重点学科基金项目(TSA1118)

摘　　要：以纳米二氧化钛为光催化剂,研究了光催化降解染料废水溶液的动力学规律及溶液的pH值、TiO2投加量和染料起始浓度对光催化降解活染料废水动力学的影响。结果表明,该反应符合Langmuir-Hinshelwood(L-H)动力学模型,且光催化过程符合一级反应动力学方程,一级反应动力学常数(K')随溶液pH值及染料起始浓度的降低而增大;TiO2的最佳投加量为2.0 g/L,低于或超过该值都会导致降解速率的下降。The dynamics of photocatalytic degradation of dyeing waste water has been investigated by using nano-TiO2 as photocatalyst. Furthermore,the effects of operation parameters such as initial dye concentra-tion,catalyst loading,and solution of the pH on the dynamics of photocatalytic degradation were dis-cussed. The results showed that the reaction accords with Langmuir-Hinshelwood（ L-H）model and the reaction is a first-order reaction and the reaction kinetics constant（ K＇）increase with the decrease of pH value and the initial concentration of dye. Meanwhile,the K＇ value would decrease when the addition of TiO2 is beyond or below the optimum amounts of TiO2 2. 0 g/L.

关 键 词：二氧化钛 光催化降解 染料废水 动力学 

分 类 号：TQ426.8[化学工程]