有机颜料与表面活性剂DBS混合物的光催化降解

Photocatalytic Degradation of Organic Pigment and Surfactant DBS

以TiO_2为光催化剂,研究了表面活性剂十二烷基苯磺酸钠(DBS)和有机颜料耐晒大红BBN(BBN)为混合组分的光催化降解,结果表明,pH值、底物的用量对体系的降解有显著影响,在碱性条件下,DBS的降解速率相对较快,而在酸性环境时,颜料的降解较快,在TiO_2等电点时,降解最慢,酸性条件下, TiO_2对BBN和DBS的吸附性比在碱性和中性环境中大,BBN/DBS体系中, DBS增大了BBN的水溶性,但是没有明显提高BBN的降解褪色速度,DBS浓度为0.42 g/L时,颜料降解最快,0.042 g/L时次之,2.1 g/L时最低,在BBN降解过程中DBS自身也被降解,且略有促进作用。

Photocatalytic degradation of surfactant sodium dodecyl benzenesulfonate（DBS） and organic pigment Light Fast Scarlet BBN （BBN） was investigated using TiO2 as photocatalyst in aqueous solution under ultraviolet light irradiation. Degradation rate and the interaction mechanism of DBS and BBN were discussed. The on pH and substrate concentraction results show that the degradation of the bicomponents depends obviously. The degradation rate of DBS was faster in alkaline medium, but the discoloration rate of BBN was faster in acidic medium. The adsorption of BBN and DBS by TiO2 in acid medium was better than inalkaline medium or in neutral condition. In the system of BBN/DBS, the degradation rate of BBN was slightly decreased by adding DBS. When the concentration of DBS was 0.42 g/L, the degradation rate of BBN was the fastest;while the concentration of DBS was 0. 042 g/L, the degradation was slightly fast; when the concentration of DBS was 2.1 g/L, the degradation was the lowest. DBS was degradated in the course of BBN degradation, and the degradation rate of DBS was slightly increased by adding DBS.