Adsorption of Natural Organic Acids Using Bi-function Resin

Abstract

Abstract:

Natural organic acids are widely existed in dissolved natural organic matter(DOM) in environment, which can form THMs in drinking water disinfection. In this paper, a new kind bi-function resin modified by amine function groups was synthesized to remove these acids from water. Comparing with commercial resin XAD-7, the higher adsorption capacities of fulvic, tannic and gallic acids were observed, such advantages had been explained on the basis of chemical function groups of WJN-07. All the isotherm data for resins in adsorption of three acids can be well fitted by the Freundlich equations, and the equilibrium adsorption capacities of tannic acid are obviously higher than fulvic and gallic acids. Furthermore, values of the enthalpy changes show the adsorption of TA on WJN-07 to be a chemical and endothermic adsorption process. Finally, the changes in the amount of three acids adsorbed on the resin WJN-07 as a function of Pb²⁺ were studied. The capacity of the resin WJN-07 to adsorb these three acids in the presence of Pb²⁺ is significant higher than in the absence of this metal, such changes owing to the interactions of Pb²⁺ with the adsorbed acids and un-adsorbed acids in solution.

Key words: Bi-function resin, Natural organic acid, Adsorption

TrendMD:

WANG Jin-Nan, LI Ai-Min*, XU Li, ZHOU Yang. Adsorption of Natural Organic Acids Using Bi-function Resin[J]. Chem. J. Chinese Universities, 2009, 30(5): 1046.

References

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