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Highly Permeable Sulfonated Graphene-Based Composite Membranes for Electrochemically Enhanced Nanofiltration.

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Sulfophenyl-functionalized reduced graphene oxide (SrGO) membranes offer superior water permeance and rejection. These graphene-based membranes also show enhanced removal of heavy metals and charged molecules when electrically biased.

Keywords:
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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background:

  • Graphene oxide (GO) membranes show promise for water treatment but often face limitations in permeance and selectivity.
  • Developing functionalized graphene materials is crucial for enhancing membrane performance in water purification.

Purpose of the Study:

  • To prepare and characterize sulfophenyl-functionalized reduced graphene oxide (SrGO) membranes.
  • To evaluate the water permeance and rejection capabilities of SrGO membranes.
  • To investigate the potential of SrGO membranes as electrodes for enhanced contaminant removal.

Main Methods:

  • Synthesis of sulfophenyl-functionalized reduced graphene oxide (SrGO).
  • Fabrication of SrGO membranes and characterization of their properties (charge density, nanochannels).
  • Performance testing for water permeance and rejection of charged molecules and heavy metal ions (Cu2+, Cr3+, Cd2+) under varying electrical potentials.

Main Results:

  • SrGO membranes exhibit high charge density and atomically smooth nanochannels.
  • Permeance of SrGO membranes reached 118.2 L m−2 h−1 bar−1, 7.6 times higher than GO membranes.
  • Rejection of heavy metal ions increased from <20% to >99% with applied negative potential (2.0 V) due to electrostatic interactions and electrochemical reduction.

Conclusions:

  • SrGO membranes demonstrate excellent water permeance and high rejection ability.
  • The electrical conductivity of SrGO membranes enables enhanced removal of heavy metals and charged pollutants via electrostatic mechanisms.
  • This work advances graphene-based membranes for efficient water treatment applications.