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Facilegreen Preparation of Novel Functionalized Cofs Rich in S, N Adsorption Sites for Ultrafast Removal of Trace Hg(Ⅱ) from Water

SSRN, ISSN: 1556-5068
2024
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Article Description

Covalent organic frameworks (COFs) are crystalline porous organic polymers that have large porosity, adjustable pore size, high-density chelating sites, variable functional groups and easy surface modification. Developing functional COFs is critical for expanding their potential for removing toxic metals from drinking water. However, until now there have been very few reports on the adsorption of trace heavy metals in drinking water using porous COFs. Here, a novel S, N-rich COF (COFETTA-BPTP-S, N) was successfully prepared using a facile green method via room temperature alkynyl-terminated COFETTA-BPTP synthesis by amine-aldehyde dehydration condensation of 4,4ʹ,4ʹʹ,4ʹʹʹ-(ethene-1,1,2,2-tetrayl)tetraaniline (ETTA) and 2,5-bis(2-propyn-1-yloxy)-1,4-benzenedicarboxaldehyde (BPTP) followed by thiol-yne click reaction with 2,5-dimercapto-1,3,4-thiadizole (DMTD). The COFETTA-BPTP has a hexagonal kgm structure and presents spherical morphology. Particularly, there are abundant S, N atoms in COFETTA-BPTP-S,N, which provides high-density adsorption sites for Hg(Ⅱ), so it can be used to efficiently adsorb Hg(Ⅱ). In addition, COFETTA-BPTP-S,N exhibited excellent performance in the presence of ultra-low concentrations of Hg(Ⅱ), achieving rapid Hg(Ⅱ) removal from 30 μg L-1 to 0.28 μg L-1 which is below the World Health Organization (WHO) limit for drinking water (1 μg L-1) within 10 seconds. COFETTA-BPTP-S,N also exhibited a high Hg(Ⅱ) removal level from water with a maximum adsorptive capacity of 621.65 mg g−1. Analysis of the adsorption mechanism indicates that the high-density S,N-containing groups have a strong binding for Hg(Ⅱ). The ultrafast adsorption dynamics, outstanding recyclability and facile green preparation make the S,N-rich COFETTA-BPTP-S,N a promising expectant for drinking water remediation of heavy metals pollution.

Bibliographic Details

Baichao Zhang; Hong Zheng; Kunmin Yang; Chenyang Li; Tong Wu; Qingqing Sui

Elsevier BV

Multidisciplinary; COFs; functionalization; trace Hg(Ⅱ); adsorption; drinking water

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