Jump to main content
Jump to site search

Issue 34, 2017
Previous Article Next Article

Thiol grafted imine-based covalent organic frameworks for water remediation through selective removal of Hg(II)

Author affiliations

Abstract

An imine-linked covalent organic framework ([HC[triple bond, length as m-dash]C]0.5-TPB-DMTP-COF), endowed with reactive ethynyl groups on the walls of one-dimensional pores, has been used as a platform for pore-wall surface engineering with triazole and thiol groups to yield TPB-DMTP-COF-SH, which is suitable to interact very efficiently with mercury ions. The evaluation of the carefully designed TPB-DMTP-COF-SH is addressed as an effective and selective system for mercury sorption. The obtained results reveal an extraordinary capacity and a great efficiency of the polymeric material with a very high distribution coefficient value Kd = 3.23 × 109. Thus, the level of mercury of a highly concentrated aqueous solution, 10 mg L−1 of Hg(II), is dramatically decreased, below the limits of what is considered to be drinking water, upon treatment with TPB-DMTP-COF-SH for a few minutes. The TPB-DMTP-COF-SH retention value of Hg(II) from water is 99.98% within 2 minutes and its record uptake capacity is 4395 mg g−1 which represents the highest value reported so far. Besides TPB-DMTP-COF-SH captures other extremely toxic heavy metal ions such as Sn(II) and Pb(II) being quite selective versus Cd(II) or As(III). These results suggest that TPB-DMTP-COF-SH constitutes a realistic alternative for the remediation of contaminated spaces from an environmental perspective.

Graphical abstract: Thiol grafted imine-based covalent organic frameworks for water remediation through selective removal of Hg(ii)

Back to tab navigation

Supplementary files

Publication details

The article was received on 27 Jun 2017, accepted on 31 Jul 2017 and first published on 31 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA05588A
Citation: J. Mater. Chem. A, 2017,5, 17973-17981
  •   Request permissions

    Thiol grafted imine-based covalent organic frameworks for water remediation through selective removal of Hg(II)

    L. Merí-Bofí, S. Royuela, F. Zamora, M. L. Ruiz-González, J. L. Segura, R. Muñoz-Olivas and M. J. Mancheño, J. Mater. Chem. A, 2017, 5, 17973
    DOI: 10.1039/C7TA05588A

Search articles by author

Spotlight

Advertisements