UV/固定化TiO_2对太湖源水中藻类胞内有机物的去除效能  

The removal efficiency of algal intracellular organic matter in Tai Lake by UV/immobilized TiO_2

作　　者：陈卫[1,2] 王嫚[2] 刘成[2] 曹喆[2] 

机构地区：[1]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,210098 [2]河海大学环境学院,南京210098

出　　处：《重庆大学学报（自然科学版）》2013年第3期114-120,共7页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(50908073);中央高校基本科研业务费专项资金资助项目(2009B17414)

摘　　要：采用溶胶凝胶法,以玻璃纤维网为载体负载TiO2薄膜,X射线衍射分析表明,其薄膜中TiO2晶相为锐钛矿型。基于UV/TiO2体系,研究其对太湖源水中藻类胞内有机物(IOM)的降解机制及其影响因素。与腐殖酸(HA)对比研究结果表明,IOM较难被光催化氧化工艺降解,反应60min时,UV254和DOC的降解率只有33.3%和19.1%,而HA的UV254和DOC降解率分别达到96.6%和57.3%;原因在于IOM主要是由大分子亲水性有机物组成,含有较多的氨基结构,而腐殖酸是强疏水性有机物,含有较多的芳香结构。同时,UV/TiO2体系的光强增强在一定程度上能提高IOM的降解效果;在pH=6.7时,IOM降解率达到最佳。The immobilized TiO2 film loaded on fiberglass mesh is prepared by sol-gel method,and the analysis result of X-ray diffraction（XRD） shows that the crystalline phase is anatase.On the basis of UV/TiO2 system,the degradation results and effect factors of algal intracellular organic matter（IOM） in Tai Lake are studied.The results show that the degradation of IOM is much harder by photocatalytic oxidation in comparison with humic acid（HA）.In 60 min,the IOM degradation of UV254 and DOC are 33.3% and 19.1%,but the HA solution are 96.6% and 57.3% respectively.The reason lies in that IOM is mainly comprised of macromolecular hydrophilic organic matter,containing more amino structures,while HA is strongly hydrophobic organic matter,containing more aromatic structures.Meanwhile,the degradation of IOM is improving as the increase of light intensity to a certain extent;the best degradation rate of IOM appears at pH=6.7.

关 键 词：玻璃纤维网负载TiO2 氧化 藻类胞内有机物 腐殖酸 太湖 

分 类 号：X703.1[环境科学与工程—环境工程]