Competitive adsorption of Cu (II) and Zn (II) on impregnate raw Algerian bentonite and efficiency of extraction

  • Autor:

    Bouazza, D. / Miloudi, H. / Adjdir, M. / Tayeb, A. / Boos, A. (2018)

  • Quelle:

    Applied Clay Science, 2018, 151, 118-123

  • Datum: Januar 2018


Impregnated homoionic raw Algerian bentonite (HB) with high basal spacing was prepared to remove a copper (Cu2 +) and zinc (Zn2 +) from 0.33 M (Na+, H+)SO42 − sulphate medium in aqueous solutions. The impregnated solid was characterized by X-ray diffraction (XRD), Fourier- Transform Infrared (FTIR) and Ultra-violet (UV). The effect of contact time, initial pH of a solution, heavy metal concentration and ligand concentration on the adsorption efficiency were investigated. Pseudo-first/s orders isotherms are applied to determine the efficiency of impregnate solid. The experimental data fitted well with the pseudo-second order model for Cu2 + and Zn2 + adsorption. Maximum capacities for Cu2 + and Zn2 + were 440 mmol/kg and 32 mmol/kg respectively. However, the adsorption is selective to copper in binary system. Moreover, impregnated solid was also regenerated and reused for subsequent recovery.