阳离子表面活性剂对有机颜料艳红6B光催化降解的影响

 研究了阳离子表面活性剂四丁基溴化铵(TBAB)和十六烷基三甲基溴化铵(CTAB)对TiO2光催化降解艳红6B(R6B)的影响,讨论了表面活性剂与R6B的相互作用,给出了二者与TiO2之间的吸附模型. 结果表明,相同条件下,阳离子表面活性剂的加入可增加R6B的降解褪色速率,但表面活性剂自身并不降解. 在强酸(pH=3.00)和强碱(pH=12.60)条件下,R6B的降解褪色速率较快. pH值相同时,体系中TBAB的浓度变化对R6B降解褪色速率的影响不大,而CTAB浓度的变化对R6B降解褪色速率的影响较为明显,CTAB浓度为0.4 g/L时R6B的降解褪色速率最快.

Effect of Cationic Surfactants on Photocatalytic Degradation of Organic Pigment Brilliant Red 6B

The photocatalytic degradation of organic pigment pollutants that are difficult to dissolve in water and two-component systems has been seldom reported up to now. The effects of two cationic surfactants, tetrabutylammonium bromide (TBAB) and cetyltrimethylammonium bromide (CTAB), on the photocatalytic degradation of organic pigment brilliant red 6B (R6B) in the presence of TiO_2 were studied in this paper. The interaction mechanism of the cationic surfactants and R6B was discussed, and the adsorption model of R6B on TiO_2 was also shown. The results indicate that the degradation of R6B can be accelerated by adding cationic surfactants, but the cationic surfactants themselves are not degraded. The discoloration of R6B in acidic (pH=3.00) and alkaline (pH=12.60) conditions are much faster than that in neutral conditions in the presence of TBAB and CTAB. The influence of TBAB concentration on the discoloration rate of R6B is not obvious, while CTAB concentration greatly affects the degradation rate at the same pH. When the concentration of CTAB is 0.4 g/L, the discoloration rate of R6B is the fastest.