Fluorine-free and hydrophobic hexadecyltrimethoxysilane-TiO2 coated mesh for gravity-driven oil/water separation

Yongwei Cai (Lead / Corresponding author), Qi Zhao (Lead / Corresponding author), Xuejun Quan, Wei Feng, Qingkuo Wang

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Abstract

Superhydrophobic and superoleophilic meshes have attracted great attention in oil/water separating application. However, superhydrophobic surfaces are not only complicated in preparation but also easy to break in practical applications. In this paper, we prepared fluorine-free hydrophobic hexadecyltrimethoxysilane (HDTMS)-TiO2 coated meshes with properties of cost-effectiveness, easy to manufacture, and high separation efficiency by a liquid phase deposition method. The surface topography, composition, and functional groups of the meshes were characterized by field emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and Fourier transform microscopic infrared spectrometer (FT-IR) spectrum, respectively. A new gravity-driven oil/water separator was designed for the separation experiments. The separation efficiency of the hydrophobic HDTMS-TiO2 coated meshes maintained over 97.8% after 35 separating cycles. This study indicated that the superhydrophobicity of the separating mesh was nonessential for the highly efficient oil-water separation. The fluorine-free hydrophobic HDTMS-TiO2 coated meshes provided an economical and beneficial solution to treat industrial oily wastewater mixtures and environmental oil spills.

Original languageEnglish
Article number124189
Pages (from-to)1-11
Number of pages11
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume586
Early online date4 Nov 2019
DOIs
Publication statusPublished - 5 Feb 2020

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Keywords

  • Fluorine-free
  • HDTMS
  • Hydrophobic coating
  • Oil/water separation
  • TiO

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