TiO_2纳米管/UV/O_3对腐殖酸的降解动力学  

Kinetics of humic acid degradation by TiO_2 nanotubes/UV/O_3

作　　者：潘留明[1,2] 季民[1] 王秀朵[2] 赵乐军[2] 陆彬[1] 

机构地区：[1]天津大学环境科学与工程学院,天津300072 [2]天津市市政工程设计研究院,天津300051

出　　处：《化工学报》2009年第9期2215-2220,共6页CIESC Journal

基　　金：教育部天南大合作项目~~

摘　　要：Titanium dioxide nanotubes(TNTs)were prepared and used as catalysts for degradation of humic acid by titanium dioxide nanotubes/UV/O3.With a view of kinetics,the effect of calcination temperature and the synergistic effect of photocatalysis and ozonation were analyzed.The influences of reaction temperature,original pH value,dosage of TNTs and dosage of ozone on the reaction kinetics were also investigated,and the reaction kinetics model was established.The result showed that photocatalysis and ozonation had a good synergistic effect and the best reaction temperature of TNTs was 400℃.The TOC removal of humic acid followed zero-order kinetics.In the model,the best reaction kinetics k was obtained under the condition with original pH value of 7.35,TNTs dosage of 0.806 g·L-1 and ozone dosage of 0.49 g·h-1.It was 0.8095 mg·L-1·min-1 when the reaction temperature was 25℃ while 0.8231 mg·L-1·min-1 at 30℃.The theoretical predictions were in good agreement with the experimental data.Titanium dioxide nanotubes（TNTs）were prepared and used as catalysts for degradation of humic acid by titanium dioxide nanotubes/UV/O3.With a view of kinetics,the effect of calcination temperature and the synergistic effect of photocatalysis and ozonation were analyzed.The influences of reaction temperature,original pH value,dosage of TNTs and dosage of ozone on the reaction kinetics were also investigated,and the reaction kinetics model was established.The result showed that photocatalysis and ozonation hada good synergistic effect and the best reaction temperature of TNTs was 400℃. The TOC removal of humic acid followed zero-order kinetics. In the model, the best reaction kinetics k was obtained under the condition with original pH value of 7.35, TNTs dosage of 0. 806 g · L^-1 and ozone dosage of 0. 49 g · h^-1. It was 0. 8095 mg · L^-1· min^-1 when the reaction temperature was 25℃ while 0. 8231 mg · L^-1 · min^-1 at 30℃. The theoretical predictions were in good agreement with the experimental data.

关 键 词：TIO2纳米管 腐殖酸 光催化 臭氧化 动力学 

分 类 号：TQ426[化学工程] O643[理学—物理化学]