Catechol-Fe(III) complexes modified PVDF membrane for hazardous pollutants separation and antifouling properties

Area of Science:

• Materials Science
• Environmental Engineering
• Chemical Engineering

Background:

• Industrial wastewater contains harmful organic pollutants like toluene and xylene.
• Membrane technology is crucial for wastewater purification.
• Current membranes struggle with oil-water selectivity and fouling due to limited antifouling properties.

Purpose of the Study:

• To enhance the performance of polyvinylidene fluoride (PVDF) membranes for oil-water separation.
• To improve water flux and antifouling capabilities of PVDF membranes.
• To develop a simple and efficient method for creating advanced separation membranes.

Main Methods:

• Developing and applying Catechol-Fe(III) complexes with a rough surface onto PVDF membranes.
• Utilizing the strong anchoring of Catechol-Fe(III) complexes compared to dip-coating.
• Characterizing membrane properties including oil contact angle and flux.

Main Results:

• The modified PVDF membranes exhibited superoleophobicity with an oil contact angle of 152°.
• Achieved high pure water flux (10487 Lm⁻²h⁻¹bar⁻¹) and emulsion flux (4697 Lm⁻²h⁻¹bar⁻¹).
• Demonstrated enhanced antifouling properties and improved oil-water selectivity.

Conclusions:

• The straightforward manufacturing process yields PVDF membranes with significantly improved permeability and antifouling performance.
• The Catechol-Fe(III) complex-modified membranes show great potential for effective oil-in-water emulsion separation.
• This approach offers a promising strategy for designing advanced membranes for challenging wastewater treatment applications.