Comprehensive studies on phosphoric acid treatment of porous titania toward titanium phosphate and pyrophosphate monoliths with pore hierarchy and a nanostructured pore surface

Yang Zhu, George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    Simple post-treatments of the porous titania monolith in varied concentrations of phosphoric acid solution provide a series of monolithic titanium phosphates (TiPs) with a hierarchically porous structure together with an exquisite macropore surface. Depending on the reaction conditions, platy crystallites composed of either Ti2O3(H2PO4)2·2H2O, Ti(HPO4)2·H2O (α-TiP), or Ti2O(PO4)2·2H2O (π-TiP) are generated on the macropore skeleton via a dissolution and reprecipitation process, which forms distinct wrinkled surface morphologies. In addition, the treatments effectively suppress the shrinkage during drying, leading to lower bulk density. Post-calcination in air yields porous titanium pyrophosphates preserving the intricate porous architecture in some cases. Notably, the hierarchically porous TiP2O7 monoliths prepared from the α-TiP precursors have a good thermal robustness related to bulk density.

    Original languageEnglish
    Pages (from-to)1397-1404
    Number of pages8
    JournalInorganic Chemistry Frontiers
    Volume5
    Issue number6
    DOIs
    Publication statusPublished - Jun 2018

    All Science Journal Classification (ASJC) codes

    • Inorganic Chemistry

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