| Summary: | Herein, food wastes such as waste rice (WR) and chicken bones (CB) were used as environmentally friendly precursors to produce activated carbon (WRCBAC) by a pyrolysis induced H3PO4 activation method. The removal of an organic dye (methyl violet, MV) from aqueous solutions has been extensively studied using WRCBAC as an adsorbent. The adsorption characteristics, including A: WRCBAC dosage (0.02–0.1 g), B: pH (4–10), and C: duration (5–20 min), were evaluated using the well-known Box-Behnken statistical approach. The findings of the adsorption isotherms showed that the MV adsorption closely matches the Langmuir model, whereas kinetic data may be adequately characterized by the pseudo-second-order model. The adsorption capacity of WRCBAC was estimated as 88.4 mg/g. Electrostatic forces, π-π stacking, and H-bonding are the potential processes that might control MV adsorption by WRCBAC. This investigation reveals that WRCBAC formed from WR and CB can be employed as a viable adsorbent for wastewater treatment. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023.
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