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Using ion exchange resin to adsorb Cr (III), 001×14.5 strong acidic cation ion exchange resin shows the best capacity through the resin selection experiment. The adsorption properties of selected 001×14.5 resin for Cr (III) were studied, and the effects of various parameters, including stirring speed, resin dosage and solution pH were studied by static experiments. The results indicate that the effect of external diffusion is eliminated when the stirring speed is over 120 r/min, the better pH value is 7, the percent removal of Cr (III) increases with the resin dosage consumption increasing. The adsorption behavior of 001×14.5 for Cr (III) obeys the Langmuir isotherm, which is favourable adsorption. The adsorption of Cr (III) on this resin follows pseudo-second-order kinetic model, the apparent activation energy is 23.4 kJ/mol, the kinetics experiments show that the particle diffusion is the main limiting rate step. The saturated resin can be regenerated by 1 mol/L sulfuric acid, and the desorption rate reaches 99%.
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Chinese Journal of Nonferrous Metals
ISSN: 1004-0609
CN: 43-1238/TG
Year: 2012
Issue: 6
Volume: 22
Page: 1791-1797