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Bioinspired interlaced wetting surfaces for continuous on-demand emulsion separation.

Hanpeng Gao1, Haiyu Qian1, Zong Meng1

  • 1School of Electrical Engineering, Yanshan University, Qinhuangdao 066004, PR China.

Journal of Hazardous Materials
|October 11, 2024
PubMed
Summary
This summary is machine-generated.

New biomimetic surfaces with hole and mastoid arrays enhance continuous emulsion separation. These interlaced wetting surfaces (HAIWSs and MAIWSs) prevent clogging, maintaining high efficiency and flux for oily wastewater treatment.

Keywords:
BiomimeticEmulsion separationInterface behaviorInterlaced wettabilityMulti-hierarchical structure

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Continuous emulsion separation faces challenges in maintaining high performance due to filter cake formation and pore clogging.
  • Existing separation surfaces often degrade over time or require complex cleaning procedures.
  • Biomimetic approaches offer potential solutions for designing advanced separation materials.

Purpose of the Study:

  • To develop novel interlaced wetting surfaces for efficient and on-demand emulsion separation.
  • To investigate the impact of hole array interlaced wetting surfaces (HAIWSs) and mastoid array interlaced wetting surfaces (MAIWSs) on separation performance.
  • To assess the recyclability and stability of these surfaces under continuous operation and harsh conditions.

Main Methods:

  • Preparation of HAIWSs and MAIWSs using laser processing, electroless silver deposition, thiol modification, and spraying.
  • Evaluation of separation efficiency and flux for various emulsion types.
  • Testing of surface performance over 50 separation cycles to determine recyclability.
  • Assessment of surface stability under harsh environmental conditions.

Main Results:

  • HAIWSs and MAIWSs achieved high separation efficiencies (∼99.5% and ∼99.3%) and maintained high flux (∼3212 and ∼3458 L m⁻² h⁻¹).
  • These surfaces significantly reduced filter cake formation and pore clogging compared to surfaces without such structures.
  • After 50 cycles, optimized surfaces retained high efficiency (∼96.2% and ∼95.8%) and flux, demonstrating excellent recyclability and stability, even in harsh conditions.

Conclusions:

  • The developed biomimetic HAIWSs and MAIWSs provide an effective mechanism for on-demand emulsion separation.
  • These surfaces overcome limitations of conventional methods by preventing clogging and offering superior recyclability and stability.
  • The strategy offers a novel approach for designing next-generation separation devices for industrial oily wastewater treatment.