【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。更多还原

【Abstract】 Solar photocatalytic degradation within 6h of Sodium Dodecyl Benzene Sulfonate(SDBS)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‰,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.更多还原