Biochar derived from food waste was modified with Fe to enhance its adsorption capacity for As(III), which is the most toxic form of As. The synthesis of Fe-impregnated food waste biochar (Fe-FWB) was optimized using response surface methodology (RSM), and the pyrolysis time (1.0, 2.5, and 4.0 h), temperature (300, 450, and 600 °C), and Fe concentration (0.1, 0.3, and 0.5 M) were set as independent variables. The pyrolysis temperature and Fe concentration significantly influenced the As(III) removal, but the effect of pyrolysis time was insignificant. The optimum conditions for the synthesis of Fe-FWB were 1 h and 300 °C with a 0.42-M Fe concentration. Both physical and chemical properties of the optimized Fe-FWB were studied. They were also used for kinetic, equilibrium, thermodynamic, pH, and competing anion studies. Kinetic adsorption experiments demonstrated that the pseudo-second-order model had a superior fit for As(III) adsorption than the pseudo-first-order model. The maximum adsorption capacity derived from the Langmuir model was 119.5 mg/g, which surpassed that of other adsorbents published in the literature. Maximum As(III) adsorption occurred at an elevated pH in the range from 3 to 11 owing to the presence of As(III) as H₂AsO₃⁻ above a pH of 9.2. A slight reduction in As(III) adsorption was observed in the existence of bicarbonate, hydrogen phosphate, nitrate, and sulfate even at a high concentration of 10 mM. This study demonstrates that aqueous solutions can be treated using Fe-FWB, which is an affordable and readily available resource for As(III) removal.

从食物垃圾中提取的生物炭用 Fe 进行了改性，以增强其对 As (III) 的吸附能力，As (III) 是毒性最强的 As 形式。使用响应面法 (RSM) 优化铁浸渍餐厨垃圾生物炭 (Fe-FWB) 的合成，热解时间（1.0、2.5 和 4.0 h）、温度（300、450 和 600 °C），和 Fe 浓度（0.1、0.3 和 0.5 M）被设置为自变量。热解温度和 Fe 浓度显着影响 As (III) 的去除，但热解时间的影响不显着。Fe-FWB 合成的最佳条件是 1 h 和 300°C，Fe 浓度为 0.42-M。研究了优化的 Fe-FWB 的物理和化学性质。它们还用于动力学、平衡、热力学、pH 和竞争阴离子研究。动力学吸附实验表明，伪二阶模型比伪一阶模型更适合 As (III) 吸附。Langmuir模型得出的最大吸附容量为119.5 mg/g，超过了文献中发表的其他吸附剂。由于 As (III) 作为 H 的存在，在 3 到 11 范围内的升高的 pH 值下发生最大的 As (III) 吸附₂ AsO ₃ ^-高于 9.2 的 pH 值。即使在 10 mM 的高浓度下，在碳酸氢盐、磷酸氢盐、硝酸盐和硫酸盐的存在下也观察到 As (III) 吸附略有减少。该研究表明，可以使用 Fe-FWB 处理水溶液，Fe-FWB 是一种经济实惠且易于获得的用于去除 As (III) 的资源。