층층나무와 신갈나무 폐바이오매스를 활용한 수용액 중 납 제거 효율 및 기작

초록

BACKGROUND: Enormous amounts of the wood biomass wastes have been produced through various wood pro-cessing. This study characterizes the surface characteristics of biomass powders of Cornus controversa (CC) and Quercus mongolica (QM) and investigates their removal efficiency and mechanism for Pb (II) in aqueous solution on which to base potential recycling alternative of the wood biomass. METHODS AND RESULTS: Batch experiments were conducted under different conditions of Pb concentrations, temperatures, time and solid/solution ratios. Adsorption isotherm of Pb by CC and QM biomass was explained sig-nificantly by the Langmuir model, indicating Pb was likely adsorbed on the monolayer of the surfaces. The adsorption kinetics were fitted significantly to the double first-order model consisting of rapid and slow steps. The respective rate constants (k1) of CC and QM for the rapid adsorption kinetic steps were 0.051 and 0.177 min-1, and most of the sorption reactions proceeded rapidly within 6-20 minutes. The maximum adsorption quantities (qmax) of Pb were 17.25 and 23.47 mg/g for CC and QM, respectively. Thermody-namic parameters revealed that adsorption of Pb on the biomass of CC and QM was a spontaneous endothermic reaction. CONCLUSION(S): Results demonstrate that biomass wastes of CC and QM can be used as Pb adsorbents judging from adsorption isotherm, kinetics, and thermodynamic parameters.

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