Superwetting sea urchin-like BiOBr@Co3O4 nanowire clusters-coated copper mesh with efficient emulsion separation and photo-Fenton-like degradation of soluble dye

Thabang Mokoba, Zhikai Li, Tian C. Zhang, Shaojun Yuan

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The development of superwetting materials for the separation of oily wastewater and emulsified oil/water mixtures has been accelerated to handle the ever-increasing oil spills from industrial and sanitary wastewaters that contain organic contaminates (e.g., dyes). Herein, sea urchin-like BiOBr@Co3O4 nanowire clusters were fabricated on the copper mesh substrates via combination of hydrothermal synthesis and calcination of Co3O4 nanowire clusters, and hydrothermal deposition of a BiOBr photocatalyst. Such a hierarchical nanostructure composite membrane acquired superhydrophilicity and underwater superoleophobic properties, and consequently presented excellent self-cleaning and anti-fouling with an underwater oil contact angle of 160.6 ± 2°. The membrane had high emulsion separation efficiency and permeation flux for both surfactant-free (≥99.98%, up to 4656.33 L·m−2·h−1) and surfactant-stabilized oil-in-water emulsions (≥98.66%, up to 887.67 L·m−2·h−1). Moreover, the deposition of BiOBr enhanced the photo-Fenton-like catalytic activity so that the membrane could degrade ≥96.0% methylene blue (50 mL, 10 ppm) within 60 min under visible light irradiation. Furthermore, the as-fabricated superwetting mesh membrane demonstrated great reusability as well as good mechanical and corrosion resistance when exposed to harsh environmental conditions. Thus, this study presents a novel high-performance superwetting material with great potential in efficient removal of insoluble and soluble organic contaminants from oily wastewater.

Original languageEnglish (US)
Article number153497
JournalApplied Surface Science
Volume594
DOIs
StatePublished - Aug 30 2022

Keywords

  • Dye degradation
  • Emulsion separation
  • Photo-Fenton-like catalysis
  • Superhydrophilicity
  • Underwater superoleophobicity

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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