铁炭微电解法降解TAIC废水

Degradation of TAIC by iron-carbon micro-electrolysis

TAIC(三烯丙基异氰脲酸酯)作为过氧化物交联或自由基反应交联的助交联剂被广泛应用。由于TAIC性质稳定难于生物降解,采用铁炭微电解法处理TAIC生产废水,并考察了铁炭比、进水pH值、反应时间对处理效果的影响,以及TAIC降解机理和反应动力学过程。结果表明,影响微电解工艺的因素主次关系为:pH>Fe/C质量比>反应时间;在最佳条件进水pH值为5,铁炭质量比为2∶1,反应时间为135 min时,COD的去除率达到46%以上,TAIC的去除率达到48%以上。TAIC去除机理研究表明,微电解对TAIC废水的作用主要通过·H的还原和铁离子的絮凝作用,其中·H的还原作用是TAIC降解的主要原因。反应动力学分析表明,铁炭微电解法处理TAIC的降解过程基本符合二级反应动力学规律,通过建立模型并拟合出了TAIC降解的二级反应动力学方程。

TAIC （triallyl isocyanurate） is widely used as a coagent for peroxide crosslinking or radical crosslinking. The iron-carbon micro-electrolysis was selected to treat TAIC in this study because it is stable and difficult to be biodegraded. The factors that affect the TAIC removal efficiency including Fe/C mass ratio,pH and reaction time were studied. Furthermore,the reaction kinetics and degradation mechanism were investigated. Orthogonal experiments were carried out to determine the order of different factors and optimal conditions as follows ： pH 〉 Fe/C mass ratio 〉 reaction time; pH = 5.0,Fe/C mass ratio = 2：1 ,reaction time = 135 min. Under opti- mum conditions,the removal efficiency of COD and TAIC was over 46% and 48% ,respectively. The reduction of · H and flocculation of iron ions were the main reasons of the TAIC degradation, and the reduction of · H played an important role in the degradation process. The results of kinetics indicated that the degradation of TAIC basically accorded with the second order kinetics,and a second order kinetic model was established.