Jump to main content
Jump to site search

Issue 6, 2017
Previous Article Next Article

A Ni-based MOF for selective detection and removal of Hg2+ in aqueous medium: a facile strategy

Author affiliations

Abstract

The uncoordinated sulfur atom of the thiocyanato ligand of a 3D metallo-organic framework (MOF), [Ni(3-bpd)2(NCS)2]n (1), where 3-bpd is 1,4-bis(3-pyridyl)-2,3-diaza-1,3-butadiene, has been explored for selective visual detection and effective removal of Hg2+ in aqueous medium. [Ni(3-bpd)2(NCS)2]n has been synthesized under ambient conditions and characterized by elemental analysis, FT-IR spectroscopy, UV-vis spectroscopy, FE-SEM and EDX, XPS and X-ray single crystal diffraction analysis. 1 shows two thiocyanato moieties bound to the hexacoordinated metal center with N atoms whereas the sulfur end remains uncoordinated. The strategy for binding and removal of Hg2+ is very simple. Hg2+ is known for its affinity for strong bond formation with the soft center, S. The sulfur atoms form bonds with this heavy metal ion. The color of 1 changes from green to grey as Hg atoms form coordinate bonds with S atoms of the SCN group. It has been found that Hg is present in grey materials in a 2 : 1 ratio (Hg/Ni). 1 is selective for Hg as other metals/metalloids, including heavy metal ions, present in water are unable to change the color of 1 as they do not form any bond with it. Binding of Hg with the S end of the thiocyanato moiety has been confirmed by a number of techniques, e.g. IR and UV-vis spectra, FESEM, EDX, and XPS. Simple filtration is done to separate grey materials for the removal of Hg2+ ion from the water medium. A theoretical calculation has been performed to rationalize the fact.

Graphical abstract: A Ni-based MOF for selective detection and removal of Hg2+ in aqueous medium: a facile strategy

Back to tab navigation

Supplementary files

Publication details

The article was received on 14 Dec 2016, accepted on 09 Jan 2017 and first published on 10 Jan 2017


Article type: Paper
DOI: 10.1039/C6DT04722J
Citation: Dalton Trans., 2017,46, 1943-1950
  •   Request permissions

    A Ni-based MOF for selective detection and removal of Hg2+ in aqueous medium: a facile strategy

    S. Halder, J. Mondal, J. Ortega-Castro, A. Frontera and P. Roy, Dalton Trans., 2017, 46, 1943
    DOI: 10.1039/C6DT04722J

Search articles by author

Spotlight

Advertisements