高度可回收的半胱胺改性耐酸 MOFs 用于增强水中 Hg(II)的去除。

Highly recyclable cysteamine-modified acid-resistant MOFs for enhancing Hg (II) removal from water.

机构信息

College of Public Health, Jilin University, Changchun, People's Republic of China.

Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, People's Republic of China.

出版信息

Environ Technol. 2020 Sep;41(23):3094-3104. doi: 10.1080/09593330.2019.1598504. Epub 2019 Apr 1.

DOI:10.1080/09593330.2019.1598504

PMID:30896301

Abstract

Thiol-functionalized metal-organic frameworks (MIL-101-SH and UiO-66-SH) were synthesized by a post-synthetic modification method as the proper adsorbents for Hg (II) removal from water. This facile method for the synthesis of UiO-66-SH was developed via a condensation reaction between cysteamine and carboxyl groups present in the framework of UiO-66-COOH. MIL-101 was functionalized by grafting amine group of cysteamine on coordinatively unsaturated chromium ions centres, yielding to MIL-101-SH adsorbents. These two types of thiol-functionalized MOFs samples by cysteamine-modified were characterized by XRD, XPS, FTIR and N adsorption-desorption isotherms respectively, which prove the successful modification of the thiol groups. The maximum adsorption capacities of mercury ions for UiO-66-SH and MIL-101-SH adsorbents were 110 and 250 mg/g at pH of 5, respectively. Moreover, the acidic medium could effectively elute Hg (II) and the adsorbents can be well reusable.

摘要

巯基功能化金属有机骨架（MIL-101-SH 和 UiO-66-SH）通过后合成修饰方法合成，作为从水中去除 Hg（II）的合适吸附剂。通过胱胺和存在于 UiO-66-COOH 骨架中的羧基之间的缩合反应，开发了 UiO-66-SH 的这种简便合成方法。MIL-101 通过将胱胺的氨基接枝到配位不饱和的铬离子中心上进行功能化，得到 MIL-101-SH 吸附剂。这两种类型的巯基官能化 MOF 样品通过胱胺修饰分别用 XRD、XPS、FTIR 和 N 吸附-解吸等温线进行了表征，证明了巯基的成功修饰。在 pH 值为 5 时，UiO-66-SH 和 MIL-101-SH 吸附剂对汞离子的最大吸附容量分别为 110 和 250mg/g。此外，酸性介质可以有效地洗脱 Hg（II），并且吸附剂可以很好地重复使用。