小型光催化滤池降解SDBS的实验研究

Experimental Study on the Degradation of SDBS Using a Small Photocatalytic Filter

摘要: 利用小型光催化滤池对十二烷基苯磺酸钠（SDBS）进行了光催化氧化降解实验。结果表明，在中性及酸性条件下，SDBS降解率保持在70%左右；当pH ＞ 9.0时，SDBS降解率随pH的升高而下降；当水体温度为50℃时，SDBS的降解效率最高。光电催化测试结果表明，预吸附时间为700 s时，水和SDBS分子在TiO2膜表面的吸附达到饱和，此时的积分电量分别为235 μC和91 μC；SDBS吸附较快，为多分子层吸附。从微观角度探讨了光催化膜表面吸附降解SDBS的过程和机理。

Abstract: The degradation experiments of sodium dodecyl benzene sulfonate (SDBS) were performed in this work by catalytic oxidation using a small photocatalytic filter. The results show that the degradation rate of SDBS keeps the value of about 70% when pH ≤ 9.0 while the value can decrease with the increase of pH once pH > 9.0, and the efficient degradation of SDBS can be received at 50℃. The test results of photoelectrochemistry also indicate that the adsorption of both water and SDBS molecules on the surface of nano TiO2 film would be saturated when the pre-adsorption time is 700 s with the integral electricity quantity of 235 μC and 91 μC, respectively. It is proved that the adsorption of SDBS molecules is a fast process with multiple layers on the surface of film. Furthermore, we discussed the adsorption process and mechanism of photocatalytic degradation about SDBS molecules in microcosmic level.