4.8 Article

Grafting Activated Graphene Oxide Nanosheets onto Ultrafiltration Membranes Using Polydopamine to Enhance Antifouling Properties

Journal

ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 42, Pages 48179-48187

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c14210

Keywords

activated graphene oxide; ultrafiltration membranes; antifouling; polydopamine; surface grafting

Funding

  1. U.S. National Science Foundation (NSF) [1635026]
  2. U.S. Department of Interior (DOI) [R17AC00147]
  3. Div Of Civil, Mechanical, & Manufact Inn
  4. Directorate For Engineering [1635026] Funding Source: National Science Foundation

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Graphene oxide (GO) nanosheets are negatively charged and exhibit excellent antifouling properties. However, their hydrophilicity makes it challenging for their grafting onto membrane surfaces to improve antifouling properties for long-term underwater operation. Herein, we demonstrate a versatile approach to covalently graft GO onto ultrafiltration membrane surfaces in aqueous solutions at approximate to 22 degrees C. The membrane surface is first primed using dopamine and then reacted with activated GO (aGO) containing amine-reactive esters. The aGO grafting improves the membrane surface hydrophilicity without decreasing water permeance. When the membranes are challenged with 1.0 g/L sodium alginate in a constant-flux crossflow system, the aGO grafting increases the critical flux by 20% and reduces the fouling rate by 63% compared with the pristine membrane. The modified membranes demonstrate stability for 48 h operation and interval cleanings using NaOH solutions.

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