A novel carboxylated polyacrylonitrile nanofibrous membrane with high adsorption capacity for fluoride removal from water.
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.
['Chen|Xin|X|', 'Wan|Caixia|C|', 'Yu|Rui|R|', 'Meng|Lingpu|L|', 'Wang|Daoliang|D|', 'Chen|Wei|W|', 'Duan|Tao|T|', 'Li|Liangbin|L|']
Carboxylated polyacrylonitrile nanofibrous membrane Fluoride removal Synchronously biaxial stretching Secondary pollution Selectivity and reusability