Multi-ligand strategy for enhanced removal of heavy metal ions by thiol-functionalized defective Zr-MOFs,Journal of Hazardous Materials

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Multi-ligand strategy for enhanced removal of heavy metal ions by thiol-functionalized defective Zr-MOFs
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-03 , DOI: 10.1016/j.jhazmat.2024.135723
Yu Zhou ₁ , Jiaxing Xiong ₁ , Li Wang ₂ , Feng Li ₁ , Huiping Bai ₃ , Shixiong Wang ₁ , Xiangjun Yang ₁

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Given the significant global concern about heavy metal pollution, the development of effective adsorbents to capture pollutants has become an urgent issue. In this work, thiol-functionalized defective Zr-MSA-DMSA was designed by mixing 2,3-dimercaptosuccinic acid and mercaptosuccinic acid, which was applied for the rapid and efficient removal of M(II) (i.e., Pb(II), Hg(II), Cd(II)) from wastewater. Zr-MSA-DMSA exhibited excellent adsorption performance, and the maximum adsorption capacities for Pb(II), Hg(II), and Cd(II) were 715.2 mg g−1, 862.7 mg g−1, and 450.5 mg g−1. In actual wastewater, Zr-DMSA-MSA exhibited up to 97 % M(II) removal efficiency and excellent anti-interference ability. It also maintained good structural stability after five adsorption/regeneration cycles. Thus, the abundant oxygen vacancies and unsaturated adsorption sites on Zr-MSA-DMSA significantly improved the adsorption performance of M(II). Spectral analysis and DFT calculations confirmed that Zr-MSA-DMSA mainly relied on the coordination of sulfur and oxygen atoms, electrostatic attraction and a large number of defective sites to achieve the adsorption of M(II). Fixed bed experiments showed that Zr-MSA-DMSA exhibited a depletion time of 10500 min and a volume of 7.0 L. In summary, Zr-MSA-DMSA holds significant potential for treating heavy metal wastewater and provides potential applications for defect engineering.

中文翻译：

多配体策略，用于增强巯基官能化缺陷 Zr-MOF 对重金属离子的去除

鉴于全球对重金属污染的严重关注，开发有效的吸附剂来捕获污染物已成为一个紧迫的问题。在本工作中，通过将 2,3-二巯基丁二酸和巯基丁二酸混合设计了巯基功能化缺陷的 Zr-MSA-DMSA，用于快速有效地去除废水中的 M（II）（即 Pb（II）、Hg（II）、Cd（II））。Zr-MSA-DMSA 表现出优异的吸附性能，对 Pb（II）、Hg（II）和 Cd（II）的最大吸附容量为 715.2 mg g-1、862.7 mg g-1 和 450.5 mg g-1。在实际废水中，Zr-DMSA-MSA 表现出高达 97% 的 M（II）去除效率和出色的抗干扰能力。在五次吸附/再生循环后，它还保持了良好的结构稳定性。因此，Zr-MSA-DMSA 上丰富的氧空位和不饱和吸附位点显著提高了 M（II）的吸附性能。光谱分析和 DFT 计算证实，Zr-MSA-DMSA 主要依靠硫原子和氧原子的配位、静电吸引和大量缺陷位点来实现 M（II）的吸附。固定床实验表明，Zr-MSA-DMSA 的去除时间为 10500 min，体积为 7.0 L。总之，Zr-MSA-DMSA 在处理重金属废水方面具有巨大潜力，并为缺陷工程提供了潜在的应用。

更新日期：2024-09-03

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