Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 411, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125113
Keywords
Fluoride removal; Carboxylated polyacrylonitrile nanofibrous membrane; Synchronously biaxial stretching; Secondary pollution; Selectivity and reusability
Categories
Funding
- National Key R&D Program of China [2018YFB0704200]
- National Natural Science Foundation of China [U1732151]
- Guangdong Provincial Key Laboratory of functional soft condensed matter
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The novel carboxylated polyacrylonitrile nanofibrous membrane (C-PAN NFM) is designed and fabricated for addressing fluoride contamination in drinking water, showing high adsorption capacity and selectivity. Carboxylation and acid treatment significantly enhance the fluoride adsorption capacity of C-PAN NFM, with a dominant adsorption mechanism driven by hydrogen bonding and ion exchange. The mass-produced C-PAN NFM exhibits great potential for efficient and recyclable fluoride removal.
To deal with the drinking water safety caused by fluoride, a novel carboxylated polyacrylonitrile nanofibrous membrane (C-PAN NFM) is designed and fabricated massively for the first time by adopting synchronously biaxial stretching and carboxylation. The C-PAN NFM is composed of the layered stack structure by cross-linked nanofibers. Due to its high specific surface area, excellent hydrophilicity, a large amount of carboxyl and amine groups, C-PAN NFM owns high fluoride adsorption capacity and outstanding selectivity. Both the carboxylation and acid treatment of C-PAN NFM improved the fluoride adsorption capacity remarkably. Specifically, C-PAN NFM shows excellent reusability without secondary pollution. The fluoride adsorption behavior of C-PAN NFM is dominated by chemical adsorption, and the adsorption mechanism is mainly driven by hydrogen bonding and ion exchange. The mass-produced C-PAN NFM is a novel polyacrylonitrile-based porous membrane that shows a great application potential for fluoride removal with good efficiency and recyclability.
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