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为了研究光催化法对不同电荷类型表面活性剂的降解性能,在紫外光照射下,用TiO2光催化剂对阴离子表面活性剂十二烷基磺酸钠(SDS)、阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)和两性表面活性剂十八烷基甜菜碱(BS18)进行降解试验.同时,探讨了TiO2光催化剂加入量、表面活性剂初始质量浓度及初始pH对光降解的影响及其动力学过程.结果表明,3种表面活性剂的降解行为符合准一级动力学规律,3种表面活性剂降解速率快慢顺序为:BS18>CTAB>SDS.SDS和BS18的最佳TiO2催化剂用量为1 g.L-1,而CTAB的最优用量为2g.L-1;CTAB和BS18的光降解速率随着活性剂初始质量浓度的增大而线性减小,SDS的降解速率则随活性剂初始质量浓度的增加而缓慢增大;CTAB和BS18在偏碱性条件下降解最快,而SDS在弱酸条件下具有最大的动力学降解速率.
In order to study the photocatalytic degradation of different charge types of surfactants, under UV irradiation, the use of TiO2 photocatalyst anionic surfactant sodium dodecyl sulfate (SDS), cationic surfactant cetyl Trimethylammonium bromide (CTAB) and amphoteric surfactant octadecyl betaine (BS18) were studied in this paper.At the same time, the effects of TiO2 photocatalyst dosage, initial concentration of surfactant and initial pH on photodegradation The results showed that the degradation behaviors of the three surfactants were in accordance with the quasi-first-order kinetics. The order of the degradation rates of the three surfactants was BS18> CTAB> SDS and the best TiO2 The optimum amount of CTAB was 2g.L-1; the photodegradation rate of CTAB and BS18 decreased linearly with the increase of the initial concentration of active agent, and the degradation rate of SDS decreased with the increase of the activity The initial concentration of CTAB and BS18 increased slowly, while CTAB and BS18 had the fastest degradation under alkaline conditions, while SDS had the largest kinetic degradation rate under weak acid conditions.