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Continuous oil/water separation using LDH-based membranes with inverse wettability.

Maryam Davardoostmanesh¹, Negin Gorgani¹, Hossein Ahmadzadeh²

¹Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, 9177948974, Iran.

Environmental Science and Pollution Research International

|July 17, 2025

Summary

This study introduces a novel continuous oil-water separation system using two membranes from a single material. The innovative design achieves high efficiency for various oil types, offering a scalable solution for environmental remediation.

Keywords:

Continuous separation Fish scales LDH Lotus leaf Oil/water mixture Wettability

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Area of Science:

Materials Science
Environmental Science
Chemical Engineering

Background:

Oil spills and industrial wastewater pose significant global environmental challenges.
Effective oil-water separation is crucial for environmental remediation and water resource management.

Purpose of the Study:

To develop a novel, continuous oil-water separation system.
To utilize a single adsorbent material, layered double hydroxide (LDH), for creating membranes with inverse wettability.

Main Methods:

Fabrication of two membranes with inverse wettability (superhydrophilic/underwater superoleophobic and superhydrophobic/superoleophilic) from a single LDH material.
Integration of these membranes into a bidirectional continuous separation system.
Mimicking biological surfaces (fish scales and lotus leaves) for membrane design.

Main Results:

Achieved separation efficiencies exceeding 98% for both light and heavy oil/water mixtures.
Demonstrated an ultrahigh flux of 105,000 Lm⁻²h⁻¹.
Successfully separated oil-water mixtures continuously using the bidirectional system.

Conclusions:

The developed system offers a cost-effective and scalable approach for continuous oil-water separation.
This advancement in membrane design using a single functional material significantly contributes to environmental remediation efforts.
The biomimetic approach provides a novel strategy for designing advanced separation membranes.