To obtain low-cost,highly efficient adsorbents and explore ways to effectively utilize agricultural solid wastes,this study used alkali metals to pre-treat mushroom residue(MR)to produce biochar,analyzing the physical and chemical properties of the resulting biochar and its performance in treating methyl orange(MO)dye wastewater.The results revealed that alkali metal intervention promoted the decarbonization and decarboxylation of MR,reducing the oxygen-containing functional groups on the biochar surface,weakening its negative charge,and enhancing its aromatic C=C structures.For adsorption of MO,alkali metal addition could significantly boost the adsorption performance of the biochar.Specifically,biochar produced at 600℃ from MR pre-treated with 2 mmol·g-1 of KCl showed optimal adsorption of MO,with the adsorption process dominated by single-layer chemisorption and a theoretical maximum adsorption capacity of 100.40 mg·g-1.This demonstrates that pre-treatment with alkali metals provides an effective way to enhance the potential application of biomass wastes.
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