Design of Functional Groups Modified into Adsorption Resins and Investigation of Mechanism for Adsorbing Gallic Acid in Water

摘要

Functional groups modified into adsorption resins were designed based on semiempirical molecular orbital theory, and the newly adsorption resin (named FZH01 modified with phthalic anhydride) having both the lower LUMO level and the higher HOMO level was prepared. The static adsorption and static desorption characteristics for gallic acid in aqueous solution onto FZH01, NDA150 and GAC at the temperature range of 288-318K were studied with bottle point method to confirm the existence of chemisorption between adsorbate and adsorbents modified, which was interpreted by the approximate orbital energy level of several adsorbents and gallic acid calculated with the semiempirical molecular orbital method PM3. The result shows that chemical interaction will be in existence in the adsorption system of gallic acid in aqueous solutions with FZH01 as like that of GAC at the proper temperature. The adsorption capacities of gallic acid in aqueous solutions with the adsorption resins modified with 2-carboxylbenzoyl increase greatly and mechanism for adsorbing gallic acid in aqueous solution was investigated.