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2008•The Chinese Journal of Nonferrous MetalsRequires access

Adsorption behavior and mechanism of lead on strong-acid cation exchange resin

Fan Chen-xi

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Abstract

The adsorption behavior of Pb2+ on 001×7 strong-acid cation exchange resin was studied with the static method and the adsorption process was analyzed from thermodynamics and kinetics aspect. The adsorption mechanism of Pb2+ on 001×7 resin was discussed by IR spectra. The experimental results show that, in the studied concentration range, the equilibrium adsorption data fit to Freundlich isotherms. Adsorption is an exothermic process running spontaneously. Kinetic analysis show that the adsorption rate is mainly governed by liquid film diffusion and with the increment of surge frequency, the adsorption rate will increase. The pH value of best adsorption condition is 4. Saturated resin can be regenerated by 3 mol/L nitric acid, the elution percentage is over 98%. The maximal static saturated adsorption capacity is 414 mg/g (wet resin) in 298 K.

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The adsorption behavior of Pb2+ on 001×7 strong-acid cation exchange resin was studied with the static method and the adsorption process was analyzed from thermodynamics and kinetics aspect. The adsorption mechanism of Pb2+ on 001×7 resin was discussed by IR spectra. The experimental results show that, in the studied concentration range, the equilibrium adsorption data fit to Freundlich isotherms. Adsorption is an exothermic process running spontaneously. Kinetic analysis show that the adsorption rate is mainly governed by liquid film diffusion and with the increment of surge frequency, the adsorption rate will increase. The pH value of best adsorption condition is 4. Saturated resin can be regenerated by 3 mol/L nitric acid, the elution percentage is over 98%. The maximal static saturated adsorption capacity is 414 mg/g (wet resin) in 298 K.

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Available abstract

The adsorption behavior of Pb2+ on 001×7 strong-acid cation exchange resin was studied with the static method and the adsorption process was analyzed from thermodynamics and kinetics aspect. The adsorption mechanism of Pb2+ on 001×7 resin was discussed by IR spectra. The experimental results show that, in the studied concentration range, the equilibrium adsorption data fit to Freundlich isotherms. Adsorption is an exothermic process running spontaneously. Kinetic analysis show that the adsorption rate is mainly governed by liquid film diffusion and with the increment of surge frequency, the adsorption rate will increase. The pH value of best adsorption condition is 4. Saturated resin can be regenerated by 3 mol/L nitric acid, the elution percentage is over 98%. The maximal static saturated adsorption capacity is 414 mg/g (wet resin) in 298 K.

Key concepts: Adsorption, Nitric acid, Freundlich equation, Ion-exchange resin, Diffusion, Ion exchange, Exothermic reaction, Kinetics

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