The aqueous mercury (Hg) pollution has aroused increasing concerns due to its harmful effects on the human body and environmental sustainability. The development of high-efficiency and recyclable adsorbents for Hg removal is necessary, which is of great significance to the aqueous environments. Herein, we synthesized a Fe3O4@DTIM (4-(5)-imidazoledithiocarboxylic acid)-MOF (Metal-organic frameworks) @SH composite as a high-efficiency and recycled adsorbent for the removal of Hg2+. The typical MOF named HKUST-1 modified by Fe3O4@DTIM and ethanedithiol endows the recyclability and high efficiency of the material, respectively. The optimized Fe3O4@DTIM-MOF@SH composite showed high affinity (adsorption rate constant K1= 0.29 g mg-1 min-1) and adsorption capacity (756.9 mg g-1) for aqueous Hg2+ removal within 120 min. The Fe3O4@DTIM-MOF@SH can be applied to adsorb Hg2+ in the pH range of 4.0 to 7.0. Additionally, the adsorbent showed high performance for Hg2+ adsorption after five cycles of utilization. State-of-the-art characterization and DFT calculation demonstrated that the sulfhydryl group on the Fe3O4@DTIM-MOF@SH composite played an important role in the Hg2+ adsorption. Thus, this study provides a new strategy for the development of MOF-based adsorbents for the high-efficiency removal of mercury during remediation activities in an aqueous solution.

Thiol-functionalized metal-organic framework embedded with chelator-modified magnetite for the high-efficiency and recyclable mercury removal in aqueous solution

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