Removal of methyl violet from aqueous solution using chemically modified biochar derived from corncob
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Abstract
Chemically modified corncob biochar was prepared to remove methyl violet, an organic dye, from simulated wastewater. Modern analytical methods, including SEM, FT-IR, BET/pore, etc., indicated that the porous biochar exhibited excellent characteristics, with a high specific surface area (989.14 m2/g), a large pore volume (0.61 cm3/g), and abundant functional groups on its surface. Consequently, it achieved high removal efficiency for methyl violet, with an adsorption capacity of 290.7 mg/g and a removal rate of 92.4% at high concentrations. The Pseudo-first-order and Temkin models can effectively simulate the kinetic and isotherm adsorption processes of BioPNa for MV, with R2 > 0.99, indicating physicochemical composite processes as the adsorption mechanisms, including pore filling, electrostatic attractions, hydrogen bonds, and π-π interactions. The porous material also demonstrated high stability and reusability after five adsorption-desorption cycles. Therefore, it can be used as a low-cost, high-efficiency material for effectively removing methyl violet from wastewater.
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© 2026 The authors. This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License.
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