固化单宁大孔吸附树脂的制备及吸附性能研究

利用Mannich反应将黑荆树单宁固定在氯甲基化聚苯乙烯树脂表面,成功地制备出一种新型固化单宁大孔吸附树脂(MARIT),并通过正交试验得出适宜的合成条件.苯酚在MARIT上的平衡吸附数据符合Freundlich吸附等温方程.利用热力学函数关系计算了等量吸附焓、吸附自由能和吸附熵,等量吸附焓在8.95～13.41 kJ/mol之间,推测吸附过程为氢键吸附.比较MARIT对苯酚的水溶液和环己烷溶液中苯酚的吸附性能,及对溶液中苯酚、间苯二酚和邻硝基苯酚的吸附性能,进一步讨论了MARIT对苯酚吸附时的氢键作用.

Preparation of Macroporous Adsorption Resin of Immobilized Tannins and Its Adsorption Behavior

Using chloromethyl polystyrene resin as matrix,a new macroporous adsorption resin of immobilized black wattle tannins(MARIT) was prepared through Mannich reaction.The condition of reaction was determined by means of orthognonal experiment.Equilibrium data for the adsorption of phenol from aqueous solution by macroporous adsorption resin as adsorbent had been obtained which were correlated with Freundlich isotherm equation.Isosteric adsorption enthalpy,adsorption free energy and adsorption entropy were calculated according to the relationship of thermodynamic function.Isosteric adsorption enthalpy was 8.95-13.41 kJ/mol,which reveals a hydrogen-bonding adsorption mechanism.Difference of adsorption properties of phenol onto MARIT from aqueous solution and cyclohexane solution,as well as difference of adsorptions of phenol,resorcinol and o-nitrophenol from aqueous solution were studied,and the results further demonstrated the hydrogen-bonding based adsorption for phenol from non-aqueous solution.