Self-cleaning PDA-Ag@PVDF membranes for oil/water separation and dye adsorption from emulsion
NEW JOURNAL OF CHEMISTRY(2024)
摘要
Membrane separation technology, as an important means of treating oily wastewater, is considered to be one of the most promising oil/water separation technologies. However, problems such as membrane contamination and single separation performance have also hindered its wider application. In this study, polydopamine (PDA)-Ag nanospheres were prepared by oxidant-induced dopamine polymerization and in situ reduction with silver ions, and assembled onto silanized poly(vinylidene fluoride) (PVDF) filtration membranes by a vacuum-assisted operation. The separation efficiency of the PDA-Ag@PVDF filter membrane for the dichloroethane oil-in-water emulsion was 98.8%, and the removal rate of malachite green dye in the emulsion was as high as 98%. After multiple separation/UV irradiation cycles, the flux recovery rate was greater than 98.7%. The PDA-Ag@PVDF filter membrane is a multifunctional and self-cleaning separation membrane, whose excellent properties make it promising in the field of oil/water separation. The superhydrophilic/underwater superoleophobic MS@PVDF membrane can achieve efficient oil/water separation and dye adsorption, and has UV-induced self-cleaning ability.
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