Journal of Research in Applied Chemistry

Authors:-Dattatraya Jirekar, Mazahar Farooqui

Abstract:-Gram seed husk (GSH) reproduced by pulses forming industries has been demonstrated to be an effective adsorbent for the removal of metal ions like Ni (II) from aqueous solution. Batch adsorption techniques were conducted to study the effects of contact time, adsorbent dose , concentration of Ni (II) metal ion solution, and effect of pH of Ni (II) metal ion solution. Pseudo-first and pseudo-second order kinetics were tested to examine the adsorption mechanism. The adsorption kinetic data were described very well by the pseudo-second-order kinetics. Equilibrium data were more effectively fitted to the both Langmuir and Freundlich model. Adsorption equilibrium was obtained at 60 min. for 5 to 20 mg/L of Ni (II) concentrations. Adsorption of Ni (II) metal ions was fundamentally dependent on pH of solution, and the optimum adsorption of Ni (II) ion was observed at pH 7. The thermodynamic parameters like (ΔG°),  and  indicates that adsorption was spontaneous and exothermic in nature. From experimental results, conclude that gram seed husk (GSH) is recommended as least expensive and easily available bio adsorbent to removal of harmful heavy metal ions from industrial wastewater.