Khalaj Mehdi, Ghashang Majid
Department of Chemistry, Buinzahra Branch, Islamic Azad University, Buinzahra, Iran.
Department of Chemistry, Najafabad Branch, Islamic Azad University, Najafabad, P.O. Box: 517, Iran.
Sci Rep. 2025 Mar 11;15(1):8413. doi: 10.1038/s41598-025-90085-1.
In this study, the FeO@SiO-L-cysteine-cellulose system was synthesized and characterized through XRD, FT-IR, EDS, and TGA-DTA analyses. This system's adsorption performance was evaluated for removing heavy metals such as Cr, Cd, Ni, and Pb from synthetic wastewater. The magnetic core demonstrated a beneficial effect on enhancing the metal adsorption capacity of the polymer, while the magnetic properties facilitated the recyclability of the adsorbent. The adsorption of Cr(VI), Cd(II), Ni(II), and Pb(II) ions was explored under varying conditions of pH, temperature, metal ion concentration, and adsorbent dosage. Maximum adsorption capacities for Cd(II), Ni(II), and Pb(II) ions were recorded at 423.56 mg/g, 426.32 mg/g, and 422.21 mg/g, respectively, under optimal conditions of pH 6.5, metal ion concentration of 600 mg/L, an adsorbent dose of 0.07 g, and room temperature. Additionally, the adsorption capacity of the material for water, N, and CO was assessed. The system exhibited excellent removal efficiency for Cr(VI) ions (˃98%) at an initial Cr(VI) concentration of 90 mg/L using 0.07 g of the adsorbent. The combination of FeO@SiO, L-cysteine, and cellulose in one adsorbent system performs distinct advantages for heavy metal adsorption such as enhanced surface area of adsorbent, preventing degradation in harsh conditions, magnetic separation and reusability of the adsorbent.
在本研究中，通过X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、能谱分析（EDS）和热重-差热分析（TGA-DTA）合成并表征了FeO@SiO-L-半胱氨酸-纤维素体系。评估了该体系从合成废水中去除Cr、Cd、Ni和Pb等重金属的吸附性能。磁性核心对提高聚合物的金属吸附能力具有有益作用，而磁性有利于吸附剂的可回收利用。在不同的pH值、温度、金属离子浓度和吸附剂用量条件下，研究了Cr(VI)、Cd(II)、Ni(II)和Pb(II)离子的吸附情况。在pH值为6.5、金属离子浓度为600 mg/L、吸附剂用量为0.07 g和室温的最佳条件下，Cd(II)、Ni(II)和Pb(II)离子的最大吸附容量分别为423.56 mg/g、426.32 mg/g和422.21 mg/g。此外，还评估了该材料对水、N和CO的吸附能力。在初始Cr(VI)浓度为90 mg/L、使用0.07 g吸附剂的情况下，该体系对Cr(VI)离子表现出优异的去除效率（>98%）。FeO@SiO、L-半胱氨酸和纤维素在一个吸附剂体系中的组合在重金属吸附方面具有明显优势，如增加吸附剂的表面积、防止在苛刻条件下降解、磁分离和吸附剂的可重复使用性。
