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Removal of Cu(II) from aqueous solutions using dried activated sludge and dried activated nano-sludge: Adsorption isotherm and kinetics

Zahra Ahmari, Reza Marandi, Ali Niazi

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J. Bio. Env. Sci.6(1), 318-326, January 2015

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Abstract

The aim of this study was to investigate the effectiveness of dried activated sludge (DAS) and dried activated nano-sludge (DANS) for removal of Cu(II). Dried activated sludge and dried activated nano-sludge prepared as a powder, were tested as sorbents for the removal of Cu(II) from aqueous solutions. The effects of various experimental parameters including pH, initial Cu(II) concentration, and mass of sorbent and contact time were examined and optimal experimental conditions were obtained. Bisorption tests confirmed maximum exchange between metal ions and protons at pH about 3.0. Langmuir, Freundlich and Dubinin-Radushkevich were used for the mathematical description of the adsorption equilibrium of the copper onto the both dried activated sludge and dried activated nano-sludge. The results show that Langmuir isotherm represented a better correlation compared to other isotherms.The maximum adsorption capacities were 65.2and 76.92 mg/g for dried activated sludge and dried activated nano-sludge, respectively. It was concluded that dried activated nano-sludge had great potential to remove Cu(II) ions from the aqueous solutions.

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Removal of Cu(II) from aqueous solutions using dried activated sludge and dried activated nano-sludge: Adsorption isotherm and kinetics

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