Abstract
Employing agricultural waste to develop activated carbon through convenient and environment friendly procedures is an excellent approach to conducting green and sustainable development. In this work, a mesoporous activated carbon (hereinafter, abbreviated as OPFPKSAC) was developed by microwave radiation-assisted K2CO3 activation of agricultural wastes including oil palm frond (OPF) and palm kernel shell (PKS). Evaluation of the adsorptive performance of OPFPKSAC was obtained by the removal of a model cationic dye (methylene blue, MB). Box-Behnken design (BBD) was implemented for optimizing the critical adsorption factors including OPFPKSAC dosage, [MB] dye, pH, and time. The BBD model found that the maximum MB removal (99.6 %) occurred under the circumstances of the OPFPKSAC dosage (0.06 g), [MB] dye (10 mg/L), pH (10), and time (20 min). The adsorption equilibrium data is consistent with the Freundlich model, and both the pseudo-first-order and pseudo-second-order models could adequately explain the kinetic data. OPFPKSAC exhibited an outstanding adsorption capability of 331.6 mg/g. Multiple mechanisms like electrostatic forces, pore filling, H-bonding, and π-π stacking, are involved in the MB dye adsorption on the OPFPKSAC's surface. This research demonstrates that the OPFPKSAC, with its environmentally benign synthesizing, low cost, high efficiency, and ease of use, is a promising adsorbent for the removal of toxic pollutants.
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•Oil palm frond (OPF) and palm kernel shell (PKS) were converted into activated carbon (OPFPKSAC).•Microwave assisted K2CO3 activation was applied to produce OPFPKSAC.•The OPFPKSAC was applied as an efficient adsorbent for methylene blue (MB) dye removal.•The optimal adsorption conditions of the MB adsorption were investigated by the BBD model.•The OPFPKSAC has an adsorption capacity (331.6 mg/g) for MB dye.