耐晒大红BBN与表面活性剂双组分光催化降解

以表面活性剂十六烷基三甲基溴化铵(CTAB)和难溶有机颜料耐晒大红BBN(简称BBN)为双组分降解底物, 以TiO2为光催化剂, 研究双组分底物的光催化降解的快慢及规律, 双组分降解的相互影响, 初步建立双组分和催化剂之间的作用模型. 结果表明, pH值及底物的浓度对双组分体系的降解都有显著影响, 碱性条件更适合体系的降解, 在中性(pH=6.8)环境中两种底物的降解效果明显高于单组分的降解. 在碱性条件下(pH=9.2), 加入BBN使CTAB的降解速率略有下降. CTAB的浓度对BBN褪色速率影响较大, 当CTAB 的浓度为1 cmc 时, BBN和CTAB的降解速率都达到最快. BBN在TiO2表面吸附性强, 且被优先降解.

Photocatalytic Degradation of Light Fast Scarlet BBN and Surfactant Bicomponents

The photocatalytic degradation of surfactant cetyltrimethylammonium bromide (CRAB) and organic pigment light fast scarlet BBN (barium 4.-[(5-chloro4-methyl-2-sulfophenyl) azo]-3-hydroxy-2-naphthalenecarboxylate, BBN) was investigated using TiO_2 as photocatalyst in aqueous solution under ultraviolet light irradiation.Decolofization rate and interaction mechanism of the surfactant and BBN were discussed,and the adsorption model of BBN and surfactant on TiO_2 was also shown.The results showed that the degradation of the bicomponents depended on pH and substrate concentration obviously.The alkaline medium was favorable to the degradation of BBN and CTAB.The degradation of the two compounds system was faster than individual organic compounds in neutral condition (pH=6.8). The degradation of CTAB was slightly slower than that without BBN in alkaline (pH=9.2).The concentration of CTAB greatly affected the discoloration of BBN.When the concentration of CrAB was 1 cmc,the degradation rates of BBN and CTAB were the fastest.BBN was adsorbed strongly on TiO_2 surface,and was preferentially degraded.