Zhang Fengrong, Liu Luxing, Zhang Cuilan, Shang Dawei, Wu Lishun
School of Chemistry and Chemical Engineering, Heze University, Heze, 274015, People's Republic of China.
Guiyang Road Primary School, Heze, 274015, People's Republic of China.
Sci Rep. 2025 Jan 20;15(1):2522. doi: 10.1038/s41598-025-86391-3.
A novel adsorbent ZnAl-LDHs/SiO (ZA/SiO) was prepared by blending urea mixture of ZnSO and Al(SO) while using SiO as a support form. The adsorption properties of ZA/SiO for the removal of toxic metal ions (Cu(II) and Cr(VI)) from water were evaluated. By batch experiment method to investigate the ZA/SiO adsorption of Cu(II) and Cr(VI) solution treatment effect. The sorption kinetics curves of Cu(II) and Cr(VI) on ZA/SiO were L-shaped. What's more, the solid concentration effect was found in the process of sorption kinetics. Langmuir and Freundlich sorption isotherm models were used to analyze the adsorption data. The results showed that the adsorption conforms to Langmuir and Freundlich adsorption isotherm models. However, the adsorption capacity of ZA/SiO compounds for Cu(II) and Cr(VI) is greatly improved. The adsorption capacity of Cu(II) is 158 mg·g and of Cr(VI) is 176 mg·g, which were 3.6 and 1.8 times of ZnAl-LDHs (ZA), respectively. Density functional theory (DFT) was utilized for the analysis of intrinsic mechanism and specific pathways. The primary mechanism for removing Cr(VI) from water mainly included the intercalation of CrO and exchange between CrO and OH, excluding Cr(OH) precipitation. Regarding the primary mechanism for eliminating Cu(II) from water, it involves isomorphic substitution as the predominant process, except for the formation of Cu(OH) precipitates.
一种新型吸附剂ZnAl-LDHs/SiO（ZA/SiO）通过将硫酸锌和硫酸铝的尿素混合物混合制备而成，同时使用SiO作为载体形式。评估了ZA/SiO对水中有毒金属离子（Cu(II)和Cr(VI)）的吸附性能。采用批量实验方法研究ZA/SiO对Cu(II)和Cr(VI)溶液的吸附处理效果。Cu(II)和Cr(VI)在ZA/SiO上的吸附动力学曲线呈L形。此外，在吸附动力学过程中发现了固体浓度效应。使用Langmuir和Freundlich吸附等温线模型分析吸附数据。结果表明，吸附符合Langmuir和Freundlich吸附等温线模型。然而，ZA/SiO化合物对Cu(II)和Cr(VI)的吸附容量有了很大提高。Cu(II)的吸附容量为158 mg·g，Cr(VI)的吸附容量为176 mg·g，分别是ZnAl-LDHs（ZA）的3.6倍和1.8倍。利用密度泛函理论（DFT）分析内在机理和具体途径。从水中去除Cr(VI)的主要机理主要包括CrO的插层以及CrO与OH之间的交换，不包括Cr(OH)沉淀。关于从水中去除Cu(II)的主要机理，除了形成Cu(OH)沉淀外，主要过程是同晶置换。
