In this study, the adsorption of
Cu2+ from aqueous solution by the biochar derived from woody biomass at different pyrolysis temperatures has been investigated. The woody biomass wastes used in this study were branch of willow (
Salix koreensis Andersson) and bark of chestnut (
Castanea crenata var. dulcis). Three biochar samples prepared by heating each biomass at temperature of
300∘C,
500∘C, and
700∘Cwere tested for the adsorption capacity of Cu. Also the physicochemical properties of the developed biochars were studied using different characterization techniques such as FT-IR, SEM, BET surface area, and cation exchange capacity (CEC). The adsorption of Cu could be well described by Langmuir model for both willow and chestnut biochars with
R2≥0.98. The maximum adsorption capacities of the biochar produced at
700∘C from the Langmuir equation were found to be 12.5 mg
g−1 and 16.9 mg
g−1 for willow and chestnut, respectively. Chestnut biochar was found to interact more effectively with the active sites available for Cu, resulting higher removal of Cu(II) than wiloow biochar. Ion exchange and surface complexation found to be the main mechanisms involved in the adsorption process. This study demonstrated the feasibility of the biochars derived from woody biomass to be as a low-cost potential adsorbent for heavy metals as Cu(II) removal in aquatic system.
Keywords: Pyrolysis;Biochar;Sorbent;Cu;Woody biomass;