富羰基含铁生物炭的制备及吸附双酚A的性能与机理OA

Improving the specific surface area and introducing functional groups are two established strategies for enhancing the pollutant-adsorption performance of biochar.In this study,carbonyl-rich iron-containing biochar(Fe-O@BC)was prepared via one-step pyrolysis using loofah as the carbon precursor and potassium ferrate as the activator.For bisphenol(BPA)adsorption,Fe-O@BC achieved a maximum capacity of 268.53 mg·g-1.The adsorbent also showed strong anti-interference ability across a wide pH range(2-8)and in the presence of common coexisting ions or humic acid.The introduction of potassium ferrate significantly optimized the structure of biochar,increasing the specific surface area of Fe-O@BC to 283 m2·g-1 and raising the proportion of carbonyl functional groups to 34.2％.Kinetic and isotherm analyses indicated that the adsorption process conformed to the pseudo-second-order kinetic model(R2>0.98)and Sips isotherm model(R2>0.99).Characterization and experimental data confirmed the adsorption mechanism involved pore filling,hydrogen bonding,and π-π interaction.Additionally,Fe-O@BC exhibited excellent adsorption amount for other organic pollutants,including tetracycline,norfloxacin,etc.After four regeneration cycles,its adsorption capacity for BPA remained at 195.94 mg·g-1.This work offers a novel modification route for converting agricultural waste into an efficient adsorbent,with promising potential for environmental remediation.