The swelling transition of lepidocrocite-type protonated layered titanates into anatase under hydrothermal treatment

H. Yuan, R. Besselink, Zhaoliang Liao, Johan E. ten Elshof

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23 Citations (Scopus)
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Abstract

The common facets of anatase crystals are the (001) and (101) planes. However, the phase transformation from lepidocrocite-type titanate into anatase by hydrothermal processing yields an anatase microstructure with high concentration of exposed (010) planes. The phase transformation of a lepidocrocite-type protonated layered titanate (HTO) into anatase was studied using XRD, TEM, FTIR, and measurement of pH and zeta potential. It was found that HTO is proton-deficient. The phase transformation process begins after uptake of a sufficient number of protons into the lepidocrocite-type structure. With the uptake of protons new hydroxyl groups form on the internal surfaces of the layered titanate and result in a bilayer state of HTO. The phase transformation reaction is a topotactic dehydration reaction in which anatase forms and water is expelled by syneresis.
Original languageEnglish
Article number4584
Number of pages6
JournalScientific reports
Volume4
DOIs
Publication statusPublished - 2014

Keywords

  • METIS-303262
  • IR-94857

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