ArticleEnvironmental science and pollution research international2026
Valorization of biochars derived from corn straw waste for the adsorption of methylene blue and methyl orange dyes: influence of acid and alkaline activation.
Article in Environmental science and pollution research international, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The increasing utilization of agro-industrial waste underscores the necessity for sustainable valorization strategies consistent with circular economy principles. In this study, corn husk residue was investigated as a precursor to produce chemically activated biochars with tunable surface chemistry and porosity, enabling targeted adsorption of the cationic dye methylene blue (MB) and the anionic dye methyl orange (MO). Two activation strategies, acidic (H₃PO₄) and alkaline (NaOH), were applied to tailor the physicochemical properties of the resulting materials, designated as acid corn biochar (ACB) and alkaline corn biochar (AKCB). ACB exhibited uniform mesoporosity and polar surface groups, which enhanced interactions with both dyes, while AKCB demonstrated hierarchical porosity and neutral or basic surface groups that promoted π-π interactions and affinity for anionic molecules. Both biochars effectively removed dyes from aqueous solutions; however, ACB achieved higher adsorption capacities, reaching 60.2 mg g⁻
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