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Thio-groups decorated covalent triazine frameworks for selective mercury removal.

Authors :
Yang Z
Gu Y
Yuan B
Tian Y
Shang J
Tsang DCW
Liu M
Gan L
Mao S
Li L
Source :
Journal of hazardous materials [J Hazard Mater] 2021 Feb 05; Vol. 403, pp. 123702. Date of Electronic Publication: 2020 Aug 15.
Publication Year :
2021

Abstract

Covalent triazine frameworks (CTFs) as a kind of covalent organic framework (COF) materials show great potential for practical application by virtue of their high stability and facile large-scale synthesis. In this work, we developed three CTFs (MSCTF-1, MSCTF-2, and xSCTF-2) of different pore size decorated with S-groups using different functionalization methods for achieving selective Hg <superscript>2+</superscript> removal from aqueous solutions. The material structures were comprehensively studied by gas adsorption, IR and XPS, etc. Among them, the MSCTF-2 with 24.45% S content showed the highest Hg <superscript>2+</superscript> adsorption capacity of 840.5 mg g <superscript>‒1</superscript> , while MSCTF-1 exhibiting much larger distribution coefficient of 1.67 × 10 <superscript>8</superscript> mL g <superscript>‒1</superscript> renders an exceptionally high efficiency for reducing the concentration of Hg <superscript>2+</superscript> contaminated water to less than 0.03 μg L <superscript>‒1</superscript> . Moreover, the MSCTFs show distinct features of: (i) high selectivity toward Hg <superscript>2+</superscript> over various transition metal ions; (ii) high stability over a wide pH range from pH 1 to 12; and (iii) good recyclability with 94% of Hg <superscript>2+</superscript> removal over five consecutive cycles. The Hg <superscript>2+</superscript> adsorption on functionalized CTFs followed pseudo-second-order kinetics and Langmuir isotherm. Our results revealed the material structure-performance relationship that the adsorption capacities depend on the binding site density whereas the distribution coefficient is essential to the removal efficiency.<br /> (Copyright © 2020 Elsevier B.V. All rights reserved.)

Details

Language :
English
ISSN :
1873-3336
Volume :
403
Database :
MEDLINE
Journal :
Journal of hazardous materials
Publication Type :
Academic Journal
Accession number :
33264889
Full Text :
https://doi.org/10.1016/j.jhazmat.2020.123702