REMOVAL OF HG(II) FROM BY ADSORPTION USING CHEMICAL MODIFIED SOYBEAN HULLS AS AN ADSORBENT AQUEOUS SOLUTIONJ.S. YADAV, M. SONI AND L.S. THAKUR
Adsorption of mercury(II) on chemically modified soybean hulls (CMSH) has been investigated as a function of solution pH, adsorbent dose, initial concentration and treatment time in batch reactors. The adsorbent modification was adopted to boost metal ion adsorption. Primarily soybean hulls were excreted with 0.2 N NaOH and then with 0.5 M citric acid. The optimized parameters are found to be pH: 4.5, adsorbent dose: 10 g/l, initial Hg(II) concentration: 20 mg/l and treatment time: 100 min. At these optimum conditions 96% removal of Hg(II) is recorded. The maximum adsorption capacity of Hg(II) is found to be7.46 mg/g. Freundlich isotherm suitably fitted to equilibrium data. Adsorption kinetic facts are satisfactorily represented by the pseudosecond order kinetic model. The results of experimental study showed that CMSH an outstanding adsorbent to remove Hg(II) from aqueous solution.