This work investigated the usability of activated carbon walnut shell (ACWS) and magnetic activated carbon walnut shell (MACWS) for Bisphenol-A (BPA) elimination from aqueous solution. Fourier-transform infrared (FT-IR) and X-ray diffraction (XRD) were used to study the chemistry of the adsorbents. Batch sorption studies at different temperatures, contact time, adsorbent dosage, pH and varied Bisphenol-A concentrations were performed, while pseudo-first-order and pseudo-second-order kinetics models were deployed to investigate the kinetic data. Equilibrium parameters were computed using the Dubinin–Radushkevich, Freundlich, Temkin and Langmuir isotherms, while Box–Behnken design was used to optimize the adsorption factors. FT-IR report showed the existence of O–H, C=O, C–O and C=C stretches in both adsorbents and Fe–O in MACWS, while XRD revealed an amorphous morphology. BPA removal by ACWS and MACWS with correlation coefficient (R²) > 0.9 showed that the pseudo-first-order kinetic model was the most appropriate for explaining the kinetic data. Judging from the values of the maximum adsorption capacity (115.85 and 166.67 mg/g for ACWS and MACWS, respectively), it can be inferred that the Langmuir isotherm best describes the equilibrium results. Thermodynamic investigation showed the process of Bisphenol-A uptake to be spontaneous and endothermic with entropy change (∆S^o) values of 0.033 and 0.039 kJ/mol for ACWS and MACWS, respectively. The data obtained from the kinetics, isotherm and equilibrium studies revealed that ACWS and MACWS adsorbents were effective for the treatment of Bisphenol-A.

这项工作研究了活性炭核桃壳 (ACWS) 和磁性活性炭核桃壳 (MACWS) 用于从水溶液中消除双酚 A (BPA) 的可用性。傅里叶变换红外 (FT-IR) 和 X 射线衍射 (XRD) 用于研究吸附剂的化学性质。在不同的温度、接触时间、吸附剂用量、pH 值和不同的双酚 A 浓度下进行了批量吸附研究，同时部署了准一级和准二级动力学模型来研究动力学数据。使用 Dubinin-Radushkevich、Freundlich、Temkin 和 Langmuir 等温线计算平衡参数，而 Box-Behnken 设计用于优化吸附因子。FT-IR 报告显示吸附剂中存在 O-H、C=O、C-O 和 C=C 拉伸，而 MACWS 中则存在 Fe-O，而XRD显示出无定形形态。具有相关系数的 ACWS 和 MACWS 去除 BPA (R² ) > 0.9 表明准一级动力学模型最适合解释动力学数据。从最大吸附容量的值（ACWS 和 MACWS 分别为 115.85 和 166.67 mg/g）来看，可以推断出 Langmuir 等温线最能描述平衡结果。热力学研究表明双酚 A 的吸收过程是自发的和吸热的，ACWS 和 MACWS 的熵变 (ΔS ^o ) 值分别为 0.033 和 0.039 kJ/mol。从动力学、等温线和平衡研究中获得的数据表明，ACWS 和 MACWS 吸附剂对处理双酚 A 是有效的。