胺基修饰的高度交联聚苯乙烯树脂对间苯二酚吸附行为研究

研究了AH系列胺基修饰的超高交联树脂对水溶液中间苯二酚的静态吸附行为特征,结果表明,它们对间苯二酚的吸附容量明显高于母体交联树脂NDA-100和大孔弱碱性阴离子交换树脂D301.AH系列树脂与吸附质分子之间不仅有范德华作用力,还存在着氢键等作用力.该类树脂对间苯二酚的吸附为自发的放热过程,属于以物理作用为主兼有弱化学作用的吸附过程.吸附速率符合准一级动力学方程,表观吸附速率常数随树脂胺基含量的升高而降低.

ADSORPTION OF RESORCINOL FROM AQUEOUS SOLUTIONS ON HYPERCROSSLINKED POLYMERIC ADSORBENTS WITH TERTIARY AMINO GROUPS

Three hypererosslinked polymeric adsorbents AH-1, AH-2 and AH-3 with different contents of tertiary amino groups were employed to remove resoreinol from aqueous solutions through static experiments. A comparision of the thermodynamic behavior among the three aminated hypercrosslinked resins, the hypercrosslinked resin NDA-100, and the macroporous weakly anion exchange resin D301 was made. It was found that the aminated hypererosslinked resins had the highest adsorption capacities of resoreinol among the three types of polymers. The results indicated that the effective interactions causing different adsorption capacities of resoreinol on the three aminated hypererosslinked polymeric adsorbents were mainly the Van der Waals force and the hydrogen-bonding interaction. The adsorptions of resorcinol on the hypercrosslinked resins were all spontaneous exothermic processes of physical characters. A firstorder irreversible reaction rate equation was suitable to the adsorption process and the adsorption rate constants decreasing with increasing the content of tertiary amino groups in the resins.