天然金红石光催化降解藏红T实验研究  

The Photocatalysis Oxidation of Safranine T by Natural Rutile

作　　者：李巧荣[1] 鲁安怀[2] 李宁[2] 李改云[1] 杨欣[1] 

机构地区：[1]中国地质大学材料科学与工程学院,北京100083 [2]北京大学地球与空间科学学院,北京100871

出　　处：《矿物岩石地球化学通报》2003年第3期215-218,223,共5页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家重大基础研究前期研究专项 (2 0 0 1CCA0 2 40 0 );国家自然科学基金资助项目 (4 0 172 0 2 2 )

摘　　要：以低压汞灯为光源研究了天然金红石悬浆体系中藏红T的脱色条件及其光催化反应动力学 ,讨论了溶液初始pH值、催化剂投入量、光强、气流量、催化剂粒径、反应气氛等实验条件对藏红T脱色速率的影响 ,阐述了实验过程中无机离子的生成情况。结果表明 ,该反应基本上符合一级反应动力学 ;在酸性条件下尤其是当溶液初始 pH值为 2 .5时 ,藏红T的脱色速率要比在碱性和中性条件下快得多 ;增加光强度能较大地提高反应的降解速率 ;催化剂最佳投入量为 1.3g L ;在氧化气氛下该反应比在非氧化气氛快得多 ;通入气体的流量在 4 0L h最合适 ;反应溶液中有氯离子溶出说明有机物中的含氯部分被降解。本研究为光催化作用降解有机污染物提供了新的途径。In natural rutile suspension sys te m, the decolorization of safranine T and its reaction kinetics were studied usin g a lowpressure mercury vapor lamp as the light source. The effect of initial p H value of safranine T solution, dosage of catalyst, intensity of UV irradiation , granularity of the catalyst, airflow rate and reaction atmosphere on photocata lytic degration rate were investigated. The development of inorganic irons in th e experiment was discussed. The results showed that the decolorization rate of s afranine T in acidic condition was much higher than in neut and alkaline conditi ons,especially,when the pH value is 2.5. Enhancing intensity of UV irradiation c an improve the reaction rate greatly. In addition, the favourable dosages of catalystx is 1.3g/L and the reaction rate is much higher in oxidative atmosp here than that in reductive atmosphere.The appropriate airflow rate is 40L/h.Fin ally we observed the existence of Cl - in the solution,which indicated that th e organic contaminants can be mineralized into inorganic molecules and ions.We p rovided a new way to mineralize organic contaminants using photo-catalyzed meth ods.

关 键 词：天然金红石 光催化降解 藏红T 实验研究 脱色 无机离子 有机污染物 废水处理 TIO2 二氧化钛 

分 类 号：X703.5[环境科学与工程—环境工程]