阳光下二氧化钛-膨润土对SDBS的降解  

SOLAR PHOTOCATALYTIC DEGRADATION OF SODIUM DODECYL BENZENE SULFONATE BY TiO_2-BENTONITE

作　　者：温淑瑶[1] 陈素云[2] 马占青[3] 高晓飞[1] 王晓岚[1] 

机构地区：[1]北京师范大学地理学与遥感科学学院,北京100875 [2]北京市勘察设计研究院有限公司,北京100038 [3]杭州职业技术学院化学工程系,浙江杭州310018

出　　处：《矿物岩石》2010年第1期106-110,共5页Mineralogy and Petrology

基　　金：国家基础科学人才培养基金项目(J0630532)

摘　　要：实验以阳光照射6h为条件研究0.5‰TiO2-膨润土对水中十二烷基苯磺酸钠(SDBS)的降解过程,结果表明:阳光照射下,TiO2-膨润土复合催化剂去除水中SDBS的性能不仅优于TiO2,而且解决了TiO2颗粒细、难回收再用的问题;且在照射的同一时间段内,阳光中紫外光强度越强,SDBS的去除率越高,即使在北方冬天紫外光强度十分弱的条件下(20μW/cm2～180μW/cm2),TiO2-膨润土复合催化剂仍能6h去除51.1%的SDBS。实验中还发现以太阳光为光源,TiO2-膨润土去除模拟废水中的SDBS的最佳条件是:pH值6.00,TiO2-膨润土的投加量约为0.5‰,模拟废水的初始浓度约为20mg/L,与以紫光灯为光源时的最佳条件相近。Solar photocatalytic degradation within 6h of Sodium Dodecyl Benzene Sulfonate （SD- BS） in aqueous solution by 0.5‰ TiO2-bentonite was studied. The results showed that： （1）TiO2 was very difficult to be recovered duo to the very small particle size of TiO2. The problem was solved by using TiO2-bentonite. Efficiency of SDBS removal by TiO2-bentonite was higher than that by TiO2 in the natural sunlight. （2）Natural sunlight as light source,the optimum condition that SDBS removal in aqueous solution by TiO2-bentonite was ： pH = 6.00, dosage of TiO2-bentonite =0. 5%0,original concentration of SDBS in aqueous solution = 20 mg/L. Above condition was similar to that as using ultraviolet light source. （3） In the same period,the higher the ultraviolet ray intensity of natural sunlight,the more of SDBS removal by TiO2-bentonite,even if ultraviolet ray intensity was very weak （ 20 μW/cm2-180 μW/cm2）,in such case, 51.1% SDBS was removed by TiO2-bentonite.

关 键 词：二氧化钛膨润土 太阳光 十二烷基苯磺酸钠 降解 

分 类 号：TK519[动力工程及工程热物理—热能工程]