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Adsorption and Microwave Desorption of 2, 4-dinitrophenol in Anion Exchange Resin

Guangquan Chen

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Abstract

Adsorption and desorption of aqueous 2, 4-dinitrophenol (2, 4-DNP) solution with 717 strongly basi anion exchange resin were investigated. Adsorption thermodynamics and kinetics as well as microwave desorption were also studied. Results indicated that the resin had high adsorption capacity of 2, 4-DNP in pH 4~11. Freundlich models could simulate adsorption equilibrium data, and adsorption was a spontaneous, exothermal and entropy decreasing process. Adsorption kinetics was satisfactory to Lagergren pseudo-second order rate equation. Intrapartical diffusion was the rate of controlling step and could be described by HSDM model. 2, 4-DNP adsorbed in the resin can be eluted, with elution rate over 90% when using 1mol/L HNO3+C2H5OH solution as a desorbent and total microwave irradiation time of 5min.

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Adsorption and desorption of aqueous 2, 4-dinitrophenol (2, 4-DNP) solution with 717 strongly basi anion exchange resin were investigated. Adsorption thermodynamics and kinetics as well as microwave desorption were also studied. Results indicated that the resin had high adsorption capacity of 2, 4-DNP in pH 4~11. Freundlich models could simulate adsorption equilibrium data, and adsorption was a spontaneous, exothermal and entropy decreasing process. Adsorption kinetics was satisfactory to Lagergren pseudo-second order rate equation. Intrapartical diffusion was the rate of controlling step and could be described by HSDM model. 2, 4-DNP adsorbed in the resin can be eluted, with elution rate over 90% when using 1mol/L HNO3+C2H5OH solution as a desorbent and total microwave irradiation time of 5min.

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Available abstract

Adsorption and desorption of aqueous 2, 4-dinitrophenol (2, 4-DNP) solution with 717 strongly basi anion exchange resin were investigated. Adsorption thermodynamics and kinetics as well as microwave desorption were also studied. Results indicated that the resin had high adsorption capacity of 2, 4-DNP in pH 4~11. Freundlich models could simulate adsorption equilibrium data, and adsorption was a spontaneous, exothermal and entropy decreasing process. Adsorption kinetics was satisfactory to Lagergren pseudo-second order rate equation. Intrapartical diffusion was the rate of controlling step and could be described by HSDM model. 2, 4-DNP adsorbed in the resin can be eluted, with elution rate over 90% when using 1mol/L HNO3+C2H5OH solution as a desorbent and total microwave irradiation time of 5min.

Key concepts: Adsorption, Desorption, Chemistry, Freundlich equation, Kinetics, Ion-exchange resin, Elution, Aqueous solution

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