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