Performance Study Of GO-Ag/F127/PVDF Composite Membrane With Ant-fouling Property

In this paper, GO-Ag/F127/PVDF composite membranes with better hydrophilicity and anti-pollution ability were prepared based on nanocomposite GO-Ag and amphiphilic F127.GO prepared by pressured oxidation method as the loader and reducer of Ag+, AgNO₃ as the reaction precursor, KOH solution as reduction activator of GO, and PVP as the dispersant were mixed by thermal reduction to prepare nanocomposite GO-Ag with high quality and properties under different conditions. Characteristic FTIR absorption spectra and XRD spectra testify that nanocomposite GO-Ag is produced by in-situ reduction reaction. SEM images show that well-dispersed GO and GO-Ag have nanolamella structure and AgNPs are evenly distributed on GO layer.The modified GO-Ag/F 127/PVDF membranes were prepared via immersion precipitation phase conversion method in water bath by mixing functional GO-Ag and amphiphilic F127. The chemical composition and pore structure of modified PVDF membrane were confirmed by FTIR, XRD, X-ray, XPS, SEM and AFM. The hydrophilicity,antifouling and permeability of modified PVDF membrane were characterized by contact angle, antibacterial activity evaluation and filtration performance evaluation of NOM pollution component. When the addition amounts of GO-Ag and F127 were 0.25 wt.% and 1.5 wt.%, modified PVDF membrane have optional hydrophilicity, pure water flux, flux recovery rate, porosity, antibacterial activity and NOM component pollution resistance.The functional modifier GO-Ag was introduced into casting solution by a in-situ reduction of mixing GO, AgNO₃ and F127 in solvent DMF and then was prepared to modified PVDF membrane in water bath via immersion precipitation phase conversion method. FTIR,XRD,UV-vis,EDX, TG,SEM and AFM were employed to investigate the porosity, chemical composition, thermal stability and pore structure of GO-Ag / F127 / PVDF modified membrane, and dynamic contact angle test, antibacterial activity test and filtration performance were used to characterize surface wettability, antibacterial effect and permeability of GO-Ag/F 127/PVDF composite membrane. When the contents of GO, AgNO₃ and F127 are 0.20 wt.%, 1.0 wt.% and 1.8 wt.%, the surface wettability, filtration performance and bacterial resistance to E.coli and S.aureus of GO-Ag/F127/PVDF modified membrane are better than other modified membranes.