Abstract
The integral hydrophobic characteristic of polymers hinders their implementations towards water treatment. In the present work, highly hydrophilic and antifouling polyvinyl chloride membranes were fabricated based on graphene oxide-silver (GO-Ag) nanolayers. The distinctive infiltration approach of polyvinyl chloride resin through the stacked GO-Ag layers results in surface availability of highly hydrophilic graphene oxide nanosheets. Incorporation of different weight percent of GO-Ag to the polyvinyl chloride resin increases the permeability, rejection and antifouling properties of polyvinyl chloride membranes. Water contact angle of pure polyvinyl chloride was found to decrease from 92.5° to 61.4° for GO-Ag based membrane. Water flux and bovine serum albumin rejection of pure polyvinyl chloride membrane were improved from 192 Lm−2 h−1 to 613 Lm−2 h−1 and 81.5% to 92.1% respectively. Besides this, graphene oxide silver based membrane depicts least irreversible fouling 14.3% and highest flux recovery ratio 85.6%. Maintenance of high flux recovery ratio of P/GO-Ag 0.5 wt% membrane after three consecutive cycles of water and bovine serum albumin filtration justify the high durability of membrane. The synthesized GO-Ag nanoadditive showed appreciable antibacterial activity against Escherichia coli. Thermo gravimetric analysis and Differential scanning calorimetry analysis of GO-Ag based membranes proves their high thermal stability as well.
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