【摘要】 以地下水中NO₃^-为目标污染物,研究氯型季胺特种树脂（CQASR）对NO₃^-的吸附动力学与热力学。结果表明:离子交换过程在60 min时达到吸附平衡,吸附动力学可用准二级动力学模型较好拟合,离子交换过程主要受液膜扩散控制;吸附等温线可用Freundlich模型较好拟合,吸附热力学表明离子交换过程为自发吸热反应;离子选择性说明CQASR可作为地下水中NO₃^-去除专用树脂;FTIR分析发现CQASR树脂本身存在甲胺盐酸盐官能团,可能与树脂选择性去除NO₃^-有关。更多还原

【Abstract】 The sorption kinetics and thermodynamics of NO₃^- removal in groundwater on chlorinated quaternary amine special resin（CQASR） are studied. The results show that the ion exchange process can reach equilibrium at 60 minutes,and the sorption kinetics can be well fitted by the pseudo-second-order kinetics model. Film diffusion is the dominant factor in the rate-limiting process of ion exchange. The sorption isotherm can be well fitted by Freundlich model. The sorption thermodynamics shows that the ion exchange process is spontaneous endothermic reaction. Ion selectivity indicates that CQASR can be used as a special resin for NO₃^- removal in groundwater. FTIR analysis shows that there are methylamine hydrochloride functional groups in CQASR resin,which may be related to the selective removal of NO₃^-.更多还原