Abstract
ABSTRACT In this study, the adsorption of Cu 2+ and Cd 2+ from aqueous solution on the biochar derived from used coffee grounds atdifferent pyrolysis temperatures has been investigated as a potential low-cost treatment method for heavy metal-containingwaters. Three biochar samples prepared by heating coffee sludge at temperature of 300 o C (B300), 500C (B500), and700 o C (B700) were tested for the adsorption capacity and kinetics of Cd and Cu. Also the influencing factor of heavymetal removal by ion exchange in terms of cation exchange capacity (CEC) of each biochar was measured. Adsorption ofCa and Cu by biochar produced at higher pyrolysis temperature showed higher adsorption capacity but the optimalpyrolysis temperature based on performance and economy was known as 500 o C. Sorption of Cu and Cd by biocharfollowed a Langmuir model at pH 6~6.5, attributing mainly to surface sorption. The biochar was more effective in Cu andCd sorption than activated carbon (AC), with BC 500 being the most effective, which indicates that sorption of Cd and Cuby coffee sludge biochar is partly influenced by chemical sorption on surface functional group as well as physical sorption.Key words :Pyrolysis, Biochar, Sorbent, Metal, Coffee sludge
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