三维电极体系对SDBS模拟生活污水的电催化降解

Electrocatalytic Degradation of SDBS Surfactants in Simulated Domestic Sewage with Three-dimensional Electrode System

采用三维电极体系对十二烷基苯磺酸钠(SDBS)模拟生活污水进行了降解。考察了分别以阳离子表面活性剂、阴离子表面活性剂和非离子表面活性剂改性高岭土为粒子电极的电催化氧化效果,并探讨了实验过程中吸附与电解的协同作用。实验证明阳离子表面活性剂(十六烷基三甲基溴化铵,CTAB)改性时降解效果最好。在CTAB浓度为0.2 g/L,粒子电极投加量为13 g,SDBS浓度为300 mg/L,不调节pH(pH=9),电流密度50 mA/cm2,Na2SO4投加量2 g时,SDBS去除率和COD去除率分别为92.31%和84.41%。同时还用环境扫描电镜和物理吸附仪对CTAB改性前后的高岭土粒子电极进行了结构表征。

Sodium dodecylbenzene-sulphonate （SDBS） in water was degraded by three-dimensional electrode reactor. A series of particle electrodes were prepared by modifying kaolin with cationic surfactant, anionic surfactant and nonionic surfactant respectively. The synergistic effect of adsorption and electrolysis was also explored. Effective electrochemical oxidation was achieved assisted with cationic surfactant （cetyltrimethylammonium bromide, CTAB） modified kaolin. Results showed that 92.31% SDBS removal and 84.41% COD removal efficiency were obtained when concentration of CTAB was 0.2 g/L, particle electrodes dosage was 13 g at pH 9, current density 50 mA/cm2, Na2SO4 2 g. Meanwhile, the particle electrodes were structurally characterized by scanning electron microscope（SEM） and Brunauer-Emmett-Teller（BET）.