期刊
CHEMICAL ENGINEERING JOURNAL
卷 370, 期 -, 页码 822-830出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.03.260
关键词
Covalent organic frameworks; Amide groups; Heavy metal adsorption; Stable recycling
资金
- National Natural Science Foundation of China [51603209, 5161101025]
- National Key R&D Program of China [2017YFB0309600]
- Ningbo Municipal Bureau of Science and Technology [2017C110034, 2017C510005]
Covalent organic frameworks (COFs) materials with designed skeleton structure and controlled pore size are a new class of adsorbent materials for environment remediation. Here, we synthesize two amide-based COFs materials via a polymerization reaction of acyl chloride and amino groups by mechanical ball milling at room temperature for Pb2+ removal as adsorbents. Two types of diamine monomers are selected to construct COFs with different framework structure and functional groups contents, i.e. COF-TP from aromatic diamine and COF-TE from linear diamine. The as-prepared COFs materials display typical lamellar structure, and the amide groups on COFs skeleton are confirmed to behave as active adsorption sites for Pb2+ capture via multi-coordination. COF-TE exhibits superior Pb(2+)adsorption capacity to COF-TP, because that less aromatic skeleton and weak pi-pi stacking of COF-TE facilitate higher internal diffusion of Pb2+ adsorption. Meanwhile, the higher amide group content on COF-TE leads to its higher saturated adsorption capacity of 185.7 mg/g than COF-TP of 140.0 mg/g. Finally, great recycling stability of Pb2+ adsorption allows the amide-based COFs materials to be promising adsorbents for heavy metal Pb2+ removal or recovery.
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