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<p>In this study, polyvinylidene fluoride (PVDF) membranes were surface-modified using a graphene oxide nanoparticle (GO)/polyvinyl alcohol (PVA) coating deposited via a dip-coating method and chemically stabilized through glutaraldehyde (GA) crosslinking. The modified membranes were characterized in terms of surface morphology, wettability, surface charge, and filtration performance. Incorporation of GO/PVA resulted in a significant decrease in water contact angle and an increase in membrane surface negativity, indicating enhanced hydrophilicity. Filtration experiments using methylene blue (MB⁺) as a model cationic dye demonstrated that the modified membranes achieved substantially higher dye rejection compared to unmodified PVDF membranes, with rejection efficiency increasing from 45.3% to 97.8% at a GO loading of 0.5 wt% under cross-flow filtration conditions. Although pure water flux decreased with increasing GO content, the modified membranes exhibited improved antifouling performance, as evidenced by a flux recovery ratio of 84.2% following bovine serum albumin (BSA) filtration, compared to 39.3% for the pristine PVDF membrane. The results indicate that GA-crosslinked GO/PVA surface modification is an effective strategy for enhancing dye rejection efficiency and fouling resistance of PVDF membranes, highlighting its potential applicability in wastewater treatment processes.</p>

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Surface Modification of PVDF Membranes with GA-Crosslinked GO/PVA for Enhanced Methylene Blue Rejection and Antifouling Performance

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Mohamed Dawam,
  • Fatma Mohamed El-Sayed,
  • Mahmoud Y. Zorainy,
  • Hussein Oraby,
  • Mohamed Gobara

摘要

In this study, polyvinylidene fluoride (PVDF) membranes were surface-modified using a graphene oxide nanoparticle (GO)/polyvinyl alcohol (PVA) coating deposited via a dip-coating method and chemically stabilized through glutaraldehyde (GA) crosslinking. The modified membranes were characterized in terms of surface morphology, wettability, surface charge, and filtration performance. Incorporation of GO/PVA resulted in a significant decrease in water contact angle and an increase in membrane surface negativity, indicating enhanced hydrophilicity. Filtration experiments using methylene blue (MB⁺) as a model cationic dye demonstrated that the modified membranes achieved substantially higher dye rejection compared to unmodified PVDF membranes, with rejection efficiency increasing from 45.3% to 97.8% at a GO loading of 0.5 wt% under cross-flow filtration conditions. Although pure water flux decreased with increasing GO content, the modified membranes exhibited improved antifouling performance, as evidenced by a flux recovery ratio of 84.2% following bovine serum albumin (BSA) filtration, compared to 39.3% for the pristine PVDF membrane. The results indicate that GA-crosslinked GO/PVA surface modification is an effective strategy for enhancing dye rejection efficiency and fouling resistance of PVDF membranes, highlighting its potential applicability in wastewater treatment processes.