Abstract
AbstractThe biosorption potential of Zn(II) from aqueous solutions using activated sludge biomass was investigated. Optimum biosorption conditions were determined with respect to pH, adsorbent dose, contact time and temperature. Langmuir, Freundlich and Dubinin–Radushkevich (D–R) isotherm models were applied to the equilibrium data. The maximum Zn(II) sorption capacity of activated sludge was found to be 76.92 mg g−1 at pH 6, biomass concentration 2 g L−1, contact time 30 min and temperature 20°C. The calculated mean biosorption energy (9.82 kJmol−1) using D–R model indicated that the biosorption of Zn(II) on the biomass was induced by chemical ion exchange.
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