Efficient removal of Pb(II) and Cd(II) from water by polyethyleneimine-amidated sepiolite-sodium alginate composite microspheres: Characterization and mechanistic analysis

IF 5.9 3区工程技术 Q1 CHEMISTRY, MULTIDISCIPLINARY

Journal of Industrial and Engineering Chemistry Pub Date : 2024-09-10 DOI:10.1016/j.jiec.2024.09.010

Bowen Wang, Hang Yin, Miao Zhang, Fenge Zhang

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引用次数: 0

Abstract

In order to improve the physicochemical properties of heavy metal adsorbents, researchers developed a novel composite microsphere material (SEI) by incorporating Sepiolite (Sep) and cross-linked polyethyleneimine (PEI) with sodium alginate (SA) as a carrier. The stability of the SEI under normal use conditions was high by thermogravimetric analysis, and COOH, OH, and NH functional groups were detected by FTIR, which were confirmed to be involved in adsorption. It was found that the adsorption rate of SEI on Pb(II) and Cd(II) obeyed a pseudo-second-order kinetic model, while the adsorption pattern was closely related to the Langmuir equation. Notably, the maximum adsorption capacity of SEI for Pb(II) and Cd(II) was 1099.93 mg/g and 112.89 mg/g, respectively, at 30 °C. In addition, thermodynamic analyses showed that the adsorption process was spontaneous, with entropy increase along with heat absorption. After six adsorption and desorption cycles, the removal of Pb(II) and Cd(II) by SEI remained above 90 %. These findings suggest that SEI is a promising and environmentally friendly material for the removal of Pb(II) and Cd(II).

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聚乙烯亚胺酰胺化海泡石-海藻酸钠复合微球高效去除水中的铅(II)和镉(II)：特性和机理分析

为了改善重金属吸附剂的理化性能，研究人员以海藻酸钠（SA）为载体，将赛皮欧莱石（Sep）和交联聚乙烯亚胺（PEI）结合在一起，开发了一种新型复合微球材料（SEI）。通过热重分析，SEI 在正常使用条件下具有很高的稳定性，并通过傅立叶变换红外光谱检测到 COOH、OH 和 NH 官能团，证实它们参与了吸附作用。研究发现，SEI 对铅（II）和镉（II）的吸附速率服从伪二阶动力学模型，而吸附模式与 Langmuir 方程密切相关。值得注意的是，在 30 °C 时，SEI 对铅（II）和镉（II）的最大吸附容量分别为 1099.93 mg/g 和 112.89 mg/g。此外，热力学分析表明，吸附过程是自发的，熵随吸热而增加。经过六个吸附和解吸循环后，SEI 对铅（II）和镉（II）的去除率仍保持在 90% 以上。这些研究结果表明，SEI 是一种很有前途的去除铅（II）和镉（II）的环保材料。

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来源期刊

Journal of Industrial and Engineering Chemistry 工程技术-工程：化工

CiteScore

10.40

自引率

6.60%

发文量

639

审稿时长

29 days

期刊介绍： Journal of Industrial and Engineering Chemistry is published monthly in English by the Korean Society of Industrial and Engineering Chemistry. JIEC brings together multidisciplinary interests in one journal and is to disseminate information on all aspects of research and development in industrial and engineering chemistry. Contributions in the form of research articles, short communications, notes and reviews are considered for publication. The editors welcome original contributions that have not been and are not to be published elsewhere. Instruction to authors and a manuscript submissions form are printed at the end of each issue. Bulk reprints of individual articles can be ordered. This publication is partially supported by Korea Research Foundation and the Korean Federation of Science and Technology Societies.