New Focused Modification Technique Improves Selectivity of Polyamide Nanofiltration Membranes
Lately, a analysis group led by Professor WAN Yinhua of the Institute of Course of Engineering (IPE) of the Chinese language Academy of Sciences developed a brand new focused modification technique to enhance the separation selectivity of NF polyamide membranes.
The examine was revealed in Journal of Membrane Science March 10.
The low selectivity of economic nanofiltration (NF) membranes for monosaccharides and monovalent salts is especially as a result of non-uniform pore measurement distribution and excessive electronegativity.
Focused modification can regulate the pore measurement distribution and electronegativity of polyamide NF membranes, and thus enhance separation selectivity.
Within the technique, the carboxyl teams (-COOH) on the floor are activated by N- (3-dimethylaminopropyl) -N’-ethyl carbodiimide (EDC) and N-Hydroxy succinimide (NHS), then grafted onto a monomer or a polymer containing an amino teams (-NH2) for extra exact separation.
The brand new focused modification technique lowered the efficient common pore measurement whereas sustaining the porosity of the NF membrane, as a result of pore segmentation. This resulted in a exceptional enchancment in glucose / fructose rejection (from 67.96% to 84.14%) and separation issue (from 2.20 to six.78), with solely a lack of permeability of 4.70 %.
“The results of this work not solely improves the effectivity of separation of small natural and inorganic salts by NF, but additionally supplies a brand new perspective within the regulation of pore measurement distribution and floor cost of NF membranes for precisely separate small molecules, “stated Professor LUO Jianquan. of PEI, the corresponding writer of the examine.
The modified membrane additionally maintained the separation efficiency in cross-flow filtration and after alkaline cleansing, which outperformed the virgin NF membrane and people modified by uniform coating and easy bodily adsorption.
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