Thio-groups decorated covalent triazine frameworks for selective mercury removal

Zhenlian Yang, Yangyi Gu, Baoling Yuan, Yuanmeng Tian, Jin Shang, Daniel C.W. Tsang, Mingxian Liu, Lihua Gan, Shun Mao, Liangchun Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)

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 Hg2+ 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 Hg2+ adsorption capacity of 840.5 mg g‒1, while MSCTF-1 exhibiting much larger distribution coefficient of 1.67 × 108 mL g‒1 renders an exceptionally high efficiency for reducing the concentration of Hg2+ contaminated water to less than 0.03 μg L‒1. Moreover, the MSCTFs show distinct features of: (i) high selectivity toward Hg2+ 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 Hg2+ removal over five consecutive cycles. The Hg2+ 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.

Original languageEnglish
Article number123702
JournalJournal of Hazardous Materials
Volume403
DOIs
Publication statusPublished - 5 Feb 2021

Keywords

  • Advanced adsorbents
  • Covalent triazine framework
  • High selectivity/recyclability
  • Mercury adsorption
  • Sulfur-functionalized

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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