流化型TiO_2光催化处理邻苯二甲酸二甲酯微污染水  

PHOTOCATALYTIC DIMETHYL PHTHALATE MICRO-POLLUTED WATER BY FLUIDIZED TiO_2 CATALYST

作　　者：吴楚萍[1] 尹平河[1] 赵玲[1] 梁凤颜[1] 

机构地区：[1]暨南大学生命科学技术学院,广东广州510632

出　　处：《水处理技术》2010年第12期63-66,共4页Technology of Water Treatment

基　　金：国家自然科学基金(40673062);广东省自然科学基金重点研究项目(04105835)

摘　　要：以浮石为载体、TiO2粉末浸渍法制备TiO2/浮石催化剂,光催化处理邻苯二甲酸二甲酯(DMP)微污染水,对催化剂的催化效率、耐用性进行考察,并探讨水体pH、HCO3-、Cl-、SO42-和腐殖酸对降解效率的影响。结果表明,当DMP初始质量浓度20 mg.L-1,催化剂投加量10 g.L-1,光降解100 min DMP降解率达94.5%,催化剂重复使用二次后DMP降解率仍在80%以上;当溶液pH为3.0时降解率下降至76.5%,表明酸性体系不利于DMP的光催化降解;3种阴离子对降解反应都有抑制作用,抑制强度为HCO3->Cl->SO42-;腐殖酸对该降解反应抑制作用明显,抑制作用随浓度增大而增强。TiO2/浮石催化剂在曝气条件下形成流化状态,使TiO2充分接触水样和吸收光源而具备较高催化效率,另外涂膜稳定牢固,可反复使用。The dimethyl phthalate micro-polluted water was photocatalytic degradation by Fluidized catalyst TiO2/pumices,which was prepared by TiO2 nanopower coated on pumices.The performance of TiO2/pumices catalyst,effects of initial pH value,anions and humate acid were studied.The results showed that the degradation efficiency reached 94.5% at 100 minute under the conditions of initial concentration of DMP of 20.0 mg·L-1,TiO2/pumices dose of 10 g·L-1.The catalyst also had a good catalytic performances after using three times.When the pH value changed to 3.0 the degradation efficiency of DMP dropped to 76.5%.The anions HCO3-,Cl-and SO42-had restrained effects of the degradation,the sequence of inhibition was HCO3-Cl-SO42-.And the efficiency was also inhibited by humic acid significantly,while the higher concentration the more inhibition increased.TiO2/pumices have a good performance because it can be stirred and illumnated adequately under aerating.The catalyst can be reused many times as the the TiO2 coating films were firmly.

关 键 词：邻苯二甲酸二甲酯 二氧化钛 浮石 催化效率 pH 阴离子 腐殖酸 

分 类 号：TQ031.7[化学工程] X703.1[环境科学与工程—环境工程]