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2004•Journal of Tongji UniversityRequires access

Adsorption of Phenolic Acids on New Type of Amino Modified Polystyrene

Siqing Xia

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Abstract

Amberlite XAD-4 polymeric resin was chemically modified with an amino group,which enables the resin (NDA-90) to be used directly without a wetting process. The adsorption behaviors of phenol and salicylic acid on NDA-90 were studied. A batch sorption experiments showed that NDA-90 resin had high sorption capacities for both phenolic acids. Equilibrium adsorption data fitted to both Langmuir and Freundlich isotherms in the studied concentration range. Adsorption was exothermic and basically of physical character. Kinetic analysis showed that the adsorption reaction could be approximated by a Lagergren pseudo-second-order-rate equation for which intraparticle diffusion was the essential rate-controlling step.

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What this paper is about

Amberlite XAD-4 polymeric resin was chemically modified with an amino group,which enables the resin (NDA-90) to be used directly without a wetting process. The adsorption behaviors of phenol and salicylic acid on NDA-90 were studied. A batch sorption experiments showed that NDA-90 resin had high sorption capacities for both phenolic acids. Equilibrium adsorption data fitted to both Langmuir and Freundlich isotherms in the studied concentration range. Adsorption was exothermic and basically of physical character. Kinetic analysis showed that the adsorption reaction could be approximated by a Lagergren pseudo-second-order-rate equation for which intraparticle diffusion was the essential rate-controlling step.

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Available abstract

Amberlite XAD-4 polymeric resin was chemically modified with an amino group,which enables the resin (NDA-90) to be used directly without a wetting process. The adsorption behaviors of phenol and salicylic acid on NDA-90 were studied. A batch sorption experiments showed that NDA-90 resin had high sorption capacities for both phenolic acids. Equilibrium adsorption data fitted to both Langmuir and Freundlich isotherms in the studied concentration range. Adsorption was exothermic and basically of physical character. Kinetic analysis showed that the adsorption reaction could be approximated by a Lagergren pseudo-second-order-rate equation for which intraparticle diffusion was the essential rate-controlling step.

Key concepts: Amberlite, Adsorption, Freundlich equation, Sorption, Chemistry, Phenol, Langmuir, Diffusion

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