Adsorption of Cr(VI) by a Weakly Basic Anion Exchange Resin D301

A new technology of using a weakly basic anion exchange resin D301 for removing Cr(Ⅵ) in heavy metals wastewater was investigated,and the theoretical and experimental basis for the development of a new efficient and safe handling technology of treatment,enrichment and recovery of wastewater containing Cr(Ⅵ) were provided.Experimental results of the static adsorption showed that the rate of removal was found to speed up with decreasing pH,and the adsorption capacity was 17.54 mg/g when pH was 2.The equilibrium adsorption data was fitted well with Frendilch isotherm,indicating the maximum adsorption capacity of 94.34 mg/g.The kinetic and thermodynamic studies showed the adsorption process was controlled by the particle diffusion,spontaneous and exothermic.The activation energy for the adsorption process was found to be 16,243.06 kJ/mol.The resin had high regeneration utilization ratio,the resin adsorption quantity decreased by only 8.54% after regenerating for 3 times.Dynamic adsorption and desorption experiments indicated that as 5% NaOH solution for the eluting agent,the eluent concentration was not only high up to 6,918.74 mg/L but also concentrated by about 69 times,and the dynamic elution curve had no trailing phenomena.The resin was particularly suitable for the treatment of low concentration wastewater containing C(r Ⅵ)(≤100 mg/L),which was almost not influenced by the velocity.