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

    Research output: Contribution to journalArticlepeer-review

    58 Citations (Scopus)
    377 Downloads (Pure)


    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
    Early online date4 Nov 2019
    Publication statusPublished - 5 Feb 2020


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

    ASJC Scopus subject areas

    • Surfaces and Interfaces
    • Physical and Theoretical Chemistry
    • Colloid and Surface Chemistry


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