TiO_2纳米管/UV/O_3对腐殖酸的降解及应用基础  

Degradation and Applied Basis of Humic Acid Treated 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：《天津大学学报》2010年第4期333-338,共6页Journal of Tianjin University(Science and Technology)

基　　金：天津市科技发展计划资助项目(06YFGZSH06700)

摘　　要：用自制的二氧化钛纳米管(TNTs)作为催化剂,对腐殖酸进行TNTs/UV/O3工艺降解研究,优化了工艺参数,对相应的应用基础进行了研究.结果表明,在最佳工艺条件下,本工艺对总有机碳(TOC)去除率高达80.12%,显示了很好的降解能力.投加叔丁醇的实验得出TNTs/UV/O3对腐殖酸的降解遵循羟基自由基理论.从无机碳(IC)的角度分析得出,高pH值易于CO2溶解,从而使原水IC值增大,有助于反应过程中IC值的积累,无机碳多以CO32-及HCO3-存在,对.OH有很强的抑制作用.随着反应时间的推移,催化剂污染越来越严重,一定阶段后污染率达到最大值,随后污染情况得到改善.TNTs对TiO2/UV/O3工艺具有很好的催化性能.In this paper, degradation of humic acid was studied by the combined technical of photocatalysis and ozona- tion which was catalyzed by TiO2 nanotubes （TNTs）. The technological parameters were optimized and the applied bases concerned were studied. The result shows that the rate of TOC removal of humic acid by TNTs/UV/O3 reaches 80.12% under the optimal condition. It proves that radical reaction played the main role in humic acid degradation by TNTs/UV/O3. The mechanism ofpH value on this technic was analyzed by inorganic carbon （IC）. At high pH value, CO2 was easily dissolved so that the value of original IC was increased, which easily accumulated IC in the reaction. The IC mainly existed in CO3^2- and HCO3 , which had obvious inhibition to ·OH. The pollution of catalyst was increased with time extending in the reaction. After a period of time, its pollution rate would reach the maximum. Then, its pollution would be improved. The study shows that TNTs are good catalysis for TiO2/UV/O3.

关 键 词：TIO2纳米管 腐殖酸 光催化 臭氧化 污染率 

分 类 号：X703.1[环境科学与工程—环境工程]