Biomimetic Hierarchical TiO2@CuO Nanowire Arrays-Coated Copper Meshes with Superwetting and Self-Cleaning Properties for Efficient Oil/Water Separation

Junyi Ji, Huaqiang He, Chen Chen, Wei Jiang, Aikifa Raza, Tie Jun Zhang, Shaojun Yuan

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Creating a practical and energy-efficient method with high efficiency to separate oil-water mixtures and emulsions is essential for sustainable aquatic ecosystem and waste oil recycling. Herein, we reported a completely inorganic hierarchical TiO2@CuO nanowire array-coated copper mesh membrane fabricated using chemical oxidation and hydrothermal recrystallization. The biomimetic hierarchical nano/micro-structure can form a lotus-leaf-like interface with fine surface roughness and hydration ability, thus endows the membrane superhydrophilic and underwater superoleophobic nature. Thus, the as-synthesized TiO2@CuO nanowire array-coated copper mesh membrane demonstrates promising water flux of 87.6 kL h-1 m-2 and ultrahigh separation efficiency with oil residue of only 12.4 mg L-1 in the permeate. Moreover, the uniformly immobilized TiO2 nanoparticles exhibit UV-irradiated photocatalytic ability, which can be effectively regenerate the contaminated membrane after exposure to UV irradiations for 60 min. Therefore, this highly-efficient, reusable, and easy-scalable membrane fabrication strategy may possess practical potential for next-generation oil/water separation application.

Original languageBritish English
Pages (from-to)2569-2577
Number of pages9
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number2
DOIs
StatePublished - 22 Jan 2019

Keywords

  • Biomimetic morphology
  • Nano/micro-hierarchical structure
  • Oil/water separation
  • Self-cleaning

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