Using MOF-74 for Hg2+ removal from ultra-low concentration aqueous solution

Performance of metal–organic frameworks for the adsorptive removal of potentially toxic elements in a water system: a critical review

“…A 94% removal of Hg(II) from a solution at a concentration of 10 mg L À1 was observed within 2 h. 118 Considering the high toxicity of Hg, many studies have been conducted to test the performance of various adsorbents for their capacity to remove Hg(II) ions from water. Table 4 summarizes the results of investigations into other types of MOFs, such as MOF-74-Zn, 119 LMOF-263, 120 and MIL-101-Thymine 121 for their Hg(II) removal potential. Although MOF-74-Zn and MIL-101-Thymine exhibited approximately similar adsorption capacities, the PC value of MOF-74-Zn was comparatively high (1.32 L g À1 ) whereas the calculated PC value for MIL-101-Thymine was less as 0.26 L g À1 (Table 4).…”

Fast and Selective Heavy Metal Removal by a Novel Metal‐Organic Framework Designed with In‐Situ Ligand Building Block Fabrication Bearing Free Nitrogen

“…[14] Therefore, functional groups such as sulfur,t hiosemicarbazide, amine, sulfamine, and so on can be used as ac helating mediumt oe nhancet he adsorption capacity.T he amine group may be able to form new structuress uch as imino with Hg II , which can be ar eason for the high, effective, and selective adsorptiono fa mine groups relative to Hg II . [16] They have displayed considerable potentialf or the remediation of environmental problems, [17] by having advantages of much higher efficiency and faster uptake rates in water treatment. Thus, an effective adsorption of Pb II by this type of materials is expected.…”

“…To solve the problem of low adsorption capacity and efficiency,n anomaterials, and in particular metal-organic frameworks (MOFs), have been used to adsorb heavy metal ions from water as an ew category of porous materials with high surfacea reas. [16] They have displayed considerable potentialf or the remediation of environmental problems, [17] by having advantages of much higher efficiency and faster uptake rates in water treatment. MOFs with free amin ligands can be good alternatives to adsorption of heavy metal ions.…”

Metal-organic framework DUT-67 (Zr) for adsorptive removal of trace Hg2+ and CH3Hg+ in water

“…So far, most of the researches are mainly about removal of heavy metal pollutants at comparable higher mg L −1 concentrations, but effective removal of heavy metal pollutions at μg L −1 levels is still a challenge [32]. The absorption performance of trace Hg 2+ was detected by using unmodified MOF-74-Zn material and the removal efficiency of 57.08%, 54.48% and 72.26% were obtained at 45°C when its concentrations were at 10 μg L −1 , 20 μg L −1 and 50 μg L −1 , respectively [33]. However, it is still a big challenge to reduce the residual Hg 2+ to below 1 μg L −1 in solution.…”