The Adsorption of CHS-1 Resin for Cr (VI) of Low Concentration from Electroplating Wastewater

The adsorption property of CHS-1 resin for Cr (VI) was investigated by chemical analysis. Experiment results show that CHS-1 resin has the best adsorption ability for Cr (VI) at pH=2-3. The exchange adsorption rate of the resin for Cr (VI) at low concentration is controlled by liquid film diffusion and chemical reaction. The behavior obeys the Freundlich isotherm and Langmuir equation. Its saturated sorption capacity is 347.22 mg/g at 298K. The thermodynamic adsorption parameters, enthalpy change ΔH and free energy change ΔG298 of the adsorption are 1.39 kJ/mol and -5.3 kJ/mol. Cr (VI) adsorbed on CHS-1 resin can be eluted by 5% NaOH -5% NaCl quantitatively without apparent decrease in sorption capacity.