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Biomass-Derived Materials in the Remediation of Heavy-Metal Contaminated Water: Removal of Cadmium(II) and Copper(II) from Aqueous Solutions

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Manganese-coated activated carbon (MCAC) and activated carbon were used in batch experiments for the removal of cadmium(II) and copper(II). Results showed that uptake of Cd(II) and Cu(II) was unaffected by increases in pH (3.0 to 8.5) or concentration (1 to 20 mg/L). Increased ionic strength (from 0.001 to 1 M NaNO3), however, significantly affected the uptake of Cd(II); adsorption of Cu(II) was not affected. Freundlich adsorption isotherm results indicated that MCAC possessed higher sorption capacity than activated carbon. Second-order rate constants were found to be 0.0386 for activated carbon and 0.0633 g/mg·min for MCAC for Cd(II) and 0.0774 for AC and 0.1223 g/mg·min for MCAC for Cu(II). Column experiments showed that maximum sorption capacity of MCAC was 39.48 mg/g for Cu(II) and 12.21 mg/g for Cd(II).
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Keywords: cadmium(II); column study; copper(II); kinetics; manganese-coated activated carbon; sorption mechanism

Document Type: Research Article

Publication date: 2011-09-01

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