Metal sulfide ion exchangers: superior sorbents for the capture of toxic and nuclear waste-related metal ions

Abstract

Metal sulfide ion-exchangers (MSIEs) have emerged as a new class of promising sorbents for the removal of toxic and radioactive metals from wastewater.

[CH3NH3]4Ga4SbS9S0.28O0.72H: A Three‐Dimensionally Open‐Framework Heterometallic Chalcogenidoantimonate Exhibiting Ni2+ Ion‐Exchange Property

“…Particularly, in simulated alkaline groundwater, the K d value could reach as high as 1.65×10 5 mL g −1 , and the Ni 2+ ion removal rate is close to 100 %. In general, a material with a K d value >10 4 mL g −1 is considered to be an excellent adsorbent . This demonstrated the suitability of 1 for the remediation of groundwater contaminated with Ni 2+ ion.…”

“…Currently, the treatment of toxic and nuclear‐waste‐related metal ions is a major concern for countries all over the world . Compared to hazardous radionuclides (e.g., Cs + , Sr 2+ ), however, the remediation of fission byproducts has not received considerable attention .…”

Goal‐Directed Design of Metal–Organic Frameworks for HgII and PbII Adsorption from Aqueous Solutions

“…As shown in Table 2, high Hg II adsorption capacities of 900, 769 and 714 mg g À1 were obtainedf or BioMOF, [25] UiO-66-NHC(S)NHMe [26] and thiol-HKUST-1, [27] respectively.T hese values are well comparable to the results obtained from materials such as functional thiol mesoporouss ilica (635 mg g À1 ) [45] and modified covalent organic frameworks (COFs;7 34 mg g À1 for TAPB-BMTTPA-COF336). [46] Also, in comparison with other adsorbents, such as MSIEs (377 mg g À1 ), [47] resins (363 mg g À1 ), [48] and mesoporouss ilica (179 mg g À1 ), [49] the above-mentioned values are significantly higher. In spite of that, the other adsorbents exhibit highera dsorptionr ates (such as 1014mgg À1 for PAF-1-SH, [50] 1216 mg g À1 for POP-SH [51] and 1350 mg g À1 for post-synthetically modified), [52] preparation of COFs often require expensive ligands and PAF-SH-1 and POP-SH require multi-step reactions.…”

Controlled Synthesis of Cr‐Co0.85Se Nanoarrays for Water Splitting at an Ultralow Cell Voltage of 1.43 V

“…Moreover, the ionization energy of selenium is less than that of sulfur. This lead to a significant difference in the band gap between the metal selenide and the metal sulfide, so the metal selenide exhibits a different property than the metal sulfide . In recent years, some research groups have developed and designed metal (Ni, Co, Fe, Cu, etc.)…”