Preparation And Properties Of Microbial Membranes With Antimicrobial Contamination Of Polyphenylene Sulfide

Polyphenylene sulfide(PPS)membrane material has excellent corrosion resistance and solvent resistance,and also has excellent performance in high temperature resistance and mechanical strength.It will be widely applied in the field of chemical,food,medicine and other membrane separation.However,membrane fouling become an inevitable problem in the process of hydrophobic PPS membrane separation and filtration,which especially bacterial-fouling seriously affects the membrane flux and the using life.In order to solve the problem of PPS membrane fouling,herein,the chemical grafting and surface adsorption modification of PPS membrane were carried out.PPS membrane with good antibacterial properties was prepared and the antibacterial property of PPS modified membranes was systematically studied.Firstly,PPS microporous membrane was used to take place the chloromethylation reaction and quaternary amination reaction.The PPS membrane took place chloromethylation reaction with trioxane and trimethylchlorosilane to form chloromethylaion PPS(CMPPS)membrane at 65 ℃ for 4 h.Then,the CMPPS membrane took place quaternary amination reaction with N-methylimidazole and triethylamine reaction to form antibacterial quaternary amination PPS(QAPPS)membrane at 50 ℃ for 8 h,and QAPPS membrane was systematacially characterized and tested.In comparison with PPS membrane,the structure and morphology of QAPPS membranes did not changed significantly,but the water flux and rejection rate increased greatly,reaching over 110 L· m-2·h-1 and 94%,respectively.QAPPS membranes had a strong antibacterial perform " ance,and the highest bacteriostasis rate could reach 99.99%.Secondly,PPS microporous membrane was used to take part in the direct and indirect loading silver nanoparticles(Ag NPs)modification.The different concentration of AgNO3 solution(0.001 mol/L、0.01 mol/L and 0.1 mol/L)was fully reacted with the pure PPS membrane and the PPS membrane coated with the polydopamine(PDA),respectively.It was found that PDA could be used as a medium layer to stabilize the Ag nanoparticles.In comparison to the direct loading Ag nanoparticles into PPS membrane,the indirect loading Ag nanoparticles into membrane had better structure and performance stability.The Ag nanoparticles loading content had a significant effect on the change of water contact angle of PPS@PDA/Ag membrane.In the antibacterial test of Escherichia coli(E.coli)and Staphylococcus aureus(S.aureus),the antibacterial effect of PPS@PDA/Ag membrane was better.Finally,the two modified methods were compared in according to the improving biological pollution resistance and those antibacterial mechanisms were analyzed.