Adsorption of fluoride from aqueous solutions by aluminum-impregnated biochar derived from food waste (Al-FWB) was studied. The individual and interactive effects of various factors on fluoride adsorption, including pyrolysis temperature and time, and aluminum content, were investigated. The optimum conditions for the synthesis of Al-FWB, predicted through a Box–Behnken-based response surface methodology model, which were as follows: a temperature of 315 °C, time of 0.65 h (39 min), and an aluminum content of 5.89%. Batch experiments were conducted to assess the feasibility of using Al-FWB for fluoride removal, and its mechanism. The Langmuir isotherm model and pseudo-second-order kinetics proved to be the best fit for the equilibrium data, with a maximum adsorption capacity of 123.4 mg/g. Thermodynamic results revealed a spontaneous endothermic reaction for fluoride adsorption. The Al-FWB showed a superior removal efficiency (91.4%) in a wide pH range (5–11) due to its pH buffering capacity during the adsorption process. The influence of co-existing anions on the fluoride adsorption was as follows: PO₄³‾ > SO₄²‾ > HCO₃‾ > NO₃‾. Therefore, Al-FWB can be used as an effective adsorbent to remove fluoride from aqueous solutions.

研究了铝制生物废料（Al-FWB）对铝中氟离子的吸附作用。研究了热解温度和时间以及铝含量等各种因素对氟化物吸附的个体和相互作用影响。通过基于Box–Behnken的响应面方法模型预测的Al-FWB合成的最佳条件如下：温度为315°C，时间为0.65 h（39分钟），铝含量为5.89％。进行了批量实验，以评估使用Al-FWB去除氟的可行性及其机理。Langmuir等温线模型和拟二级动力学证明最适合平衡数据，最大吸附容量为123.4 mg / g。热力学结果表明氟化物吸附有自发的吸热反应。Al-FWB由于在吸附过程中具有pH缓冲能力，因此在宽的pH范围（5-11）中显示出优异的去除效率（91.4％）。共存阴离子对氟化物吸附的影响如下：PO₄ ³〜> SO ₄ ²〜> HCO ₃〜> NO ₃〜。因此，Al-FWB可以用作从水溶液中去除氟化物的有效吸附剂。