胺化聚苯乙烯树脂的制备及吸附对硝基酚

摘要

Two kinds of aminated polystyrene resins,PS-TETA and PS-Acyl-TETA were prepared with triethylenetetramine (TETA) by reacting with chloromethyl polystyrene resin (PS-Cl) and chloroacetylated polystyrene resin (PS-Acyl-TETA) , respectively. The structure of resins was charactered with FTIR and BET,and the adsorptions of p-nitrophenol (PNP) were investigated. The static and dynamic adsorption experimental results show that the adsorption processes for the PNP of two resins can be described by pseudo-second order kinetic equation. The main control steps of two kinds of resins adsorption PNP are governed by liquid film diffusion. The adsorption data of PNP on two kinds of resins are fitted into Freundlich isotherms,which belong to multilayer adsorption. The adsorptions are all spontaneous exothermic processes of physical characters. The adsorption capacity toward PNP of PS-TETA and PS-Acyl-TETA reaches 157.87mg/mL and 90.77mg/mL,respectively. The breakthrough volume of resins are 165BV and 80BV,respectively. The desorption efficiency of two resins are 98.4%and 98.9%,respectively.%以氯甲基化聚苯乙烯树脂（PS-Cl）和氯乙酰化聚苯乙烯树脂（PS-Acyl-Cl）为母体，引入三乙烯四胺（TETA）制备两种胺化聚苯乙烯树脂 PS-TETA 与 PS-Acyl-TETA。用红外光谱和表面孔径吸附仪对树脂进行表征，并用于对硝基酚（PNP）的吸附研究。静态和动态吸附实验结果表明，两种树脂对 PNP 的吸附过程都可以用准二级动力学方程来描述；液膜扩散为吸附PNP的主要控制步骤；吸附符合Freundlich等温方程，为多分子层吸附；吸附为自发的放热过程，属于以物理吸附为主的吸附过程；PS-TETA与PS-Acyl-TETA对PNP的饱和吸附量分别为157.87mg/mL、90.77mg/mL，穿透体积为165BV、80BV，动态脱附率为98.4%、98.9%。