Original Articles
Ke Changzhong, Fang Jie, Liu Z
Abstract
The hypercrosslinked polymeric adsorbents containing multicarboxyl groups and modified with phthalic anhydride, 1,2,4-benzenetricarboxylic anhydride or pyromellitic dianhydride (respectively named FZH12,FZH124,FZH1245) were prepared and characterized. The static adsorption of single or binary system, adsorption characteristics for phthalimide or anthranilic acid in aqueous solution at the temperature range of 288~318K on above self-prepared hypercrosslinked polymeric adsorbents were studied by using bottle point method and the influence of pH or inorganic salt on adsorption efficiencies were carried out. The results indicated that adsorption isotherms for phthalimide and anthranilic acid in both single and binary systems can be well fitted by the Langmuir equation, while the individual adsorbed amounts of phthalimide or anthranilic acid on above adsorbents in binary systems is higher than those in single systems because of the hydrogen bonding or weak acid base interaction between phthalimide and anthranilic acid towards the adsorption sites, and the existence of chemisorption effects at the proper temperature between adsorbents and adsorbates was confirmed and interpreted by the approximate orbital energy level difference between adsorbents and adsorbates calculated with the semiempirical molecular orbital method PM3. It is unobvious for adsorption efficiencies with low concentration inorganic salts but the change of pH value has an obvious influence on both adsorption systems.