Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 403, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123702
Keywords
Covalent triazine framework; Sulfur-functionalized; Advanced adsorbents; Mercury adsorption; High selectivity/recyclability
Categories
Funding
- National Natural Science Foundation of China [21501135, 21875165]
- Fundamental Research Funds for the Central Universities
- Recruitment Program of Global Experts of China
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In this study, three Covalent Triazine Frameworks (CTFs) decorated with S-groups were developed for selective removal of Hg2+ from aqueous solutions. Among them, MSCTF-2 showed the highest Hg2+ adsorption capacity, while MSCTF-1 exhibited exceptional efficiency for reducing Hg2+ concentration. The adsorption process followed pseudo-second-order kinetics and Langmuir isotherm, with adsorption capacities dependent on binding site density and distribution coefficient being essential to removal efficiency.
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 x 10(8) mL g(-1) renders an exceptionally high efficiency for reducing the concentration of Hg2+ contaminated water to less than 0.03 mu g 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.
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