论文部分内容阅读
通过氯甲基化的苯乙烯-二乙烯苯共聚物的后交联及单宁酸的化学修饰反应制备了单宁酸修饰的超高交联吸附树脂(TAMR),通过红外光谱、元素分析、扫描电镜和比表面孔径分析对TAMR树脂的结构特征和表面参数及形貌进行表征.通过等温吸附实验和吸附动力学实验研究了苯酚、对硝基苯酚和对氯苯酚在TAMR树脂上的吸附性能和吸附机理.结果表明,TAMR树脂具有较高的比表面积(780.1 m2/g)和较丰富的微孔(482.3 m2/g),树脂表面修饰了较丰富的羟基.TAMR树脂对苯酚、对硝基苯酚和对氯苯酚均具有较好的吸附性能,288 K时吸附量分别可达1.43、2.07和2.48 mmol/g(c0为500 mg/L).3种酚类化合物在TAMR树脂上的吸附为典型的物理吸附,其吸附焓变和熵变均为负值.当酚类化合物以分子形态存在时,有利于其被TAMR树脂吸附.Langmuir和Freundlich方程均能较好地拟合酚类化合物在TAMR树脂上的吸附等温线.吸附动力学过程符合准一级动力学方程,颗粒内扩散过程是TAMR树脂吸附这3种酚的吸附速率的主要控制步骤.
The tannic acid-modified ultra-high crosslinked resin (TAMR) was prepared by the post-crosslinking of the chloromethylated styrene-divinylbenzene copolymer and the chemical modification of tannic acid. Scanning electron microscopy and specific surface area analysis were used to characterize the structure, surface parameters and morphology of TAMR resin.The adsorption of phenol, p-nitrophenol and p-chlorophenol on TAMR resin was studied by isothermal adsorption experiment and adsorption kinetics experiment And adsorption mechanism.The results show that TAMR resin has a higher specific surface area (780.1 m2 / g) and a richer micropore (482.3 m2 / g) Both phenol and p-chlorophenol had good adsorption properties, and the adsorption capacities reached 1.43, 2.07 and 2.48 mmol / g at 288 K (500 mg / L c0) respectively. The adsorption of three phenolic compounds on TAMR resin Is a typical physical adsorption, the adsorption enthalpy change and entropy change are negative.When the phenolic compounds exist in the molecular form, it is conducive to its adsorption by TAMR resin.Langmuir and Freundlich equation can better fit the phenolic compounds Adsorption isotherms on TAMR resins Adsorption kinetics equations with pseudo first order kinetics, the particles are diffusion controlling step TAMR Adsorption The adsorption rate of the three types of phenols.