Fabrication and characterization of TiO2/ZrO2 ceramic membranes for nanofiltration

Honglin Guo, Shuaifei Zhao*, Xiaoxian Wu, Hong Qi

*Corresponding author for this work

    Research output: Contribution to journalArticle

    34 Citations (Scopus)

    Abstract

    TiO2/ZrO2 ceramic nanofiltration membranes are successfully fabricated through the polymeric sol–gel route followed by the dip-coating technique. Disk type α-alumina supported mesoporous γ-alumina (pore size: 5–6 nm) is employed as the support in dip-coating. The unsupported and supported composite ceramic membranes are systematically characterized and evaluated in terms of phase composition, chemical stability, gas adsorption, molecular weight cut-off (MWCO), membrane pore size, water flux and salt rejection. It is found that the TiO2/ZrO2 ceramic membranes have amorphous phase at 400 and 500 °C, suggesting the high thermal stability. The fabricated membranes have the MWCO of 620–860 Da, corresponding to the membrane pore size of 1.2–1.5 nm. Relatively low water permeability can be attributed to the low microporosity of the membrane. Donnan exclusion is the dominant transport mechanism of the NF membrane in the single-component system, and salt rejection is closely related to the hydration properties of the ions (e.g., the hydration radius).

    Original languageEnglish
    Pages (from-to)125-131
    Number of pages7
    JournalMicroporous and Mesoporous Materials
    Volume260
    DOIs
    Publication statusPublished - 1 Apr 2018

    Keywords

    • Ceramic membrane
    • Inorganic membrane
    • Membrane characterization
    • Nanofiltration
    • Sol–gel

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