POLYMORPHIC TRANSFORMATION OF TITANIUM DIOXIDE CAUSED BY HEAT TREATMENT OF PROTONIC LEPIDOCROCITE TITANATE

https://doi.org/10.22146/ijc.21451

Hari Sutrisno(1*), Sunarto Sunarto(2)

(1) Department of Chemical Education, Faculty of Mathematics and Natural Science, Yogyakarta State University (YSU), Kampus Karangmalang, Yogyakarta 55281
(2) Department of Chemical Education, Faculty of Mathematics and Natural Science, Yogyakarta State University (YSU), Kampus Karangmalang, Yogyakarta 55281
(*) Corresponding Author

Abstract


The polymorphic phases of titanium dioxide were successfully prepared by heat treatments of protonic lepidocrocite titanate, H0.54Ti1.8650.135O4·0.5H2O at various temperatures. The prepared powders were characterized with EDX (Energy Dispersive X-ray), Scanning Electron Microscopy (SEM), X-rays Diffractometer (XRD), Raman Spectroscopy, and High Resolution Transmission Electron Microscopy (HRTEM). The effect of calcination temperature on the phase structure and morphology of the heated samples was investigated. The research indicated that the protonic titanate, H0.54Ti1.8650.135O4·0.5H2O ( = vacancy), lost the interlayer water by being heated up to 200 °C to produce a dehydrated phase, H0.54Ti1.8650.135O4. Above 300 °C, the dehydrated phase, H0.54Ti1.8650.135O4, completely transformed to TiO2(B) and anatase was obtained as pure phase at 600 °C. The phase transformed as the following process: H0.54Ti1.8650.135O4·0.5H2O ®  H0.54Ti1.8650.135O4·0.25H2  ®  H0.54Ti1.8650.135O4 ®  TiO2(B) ®  TiO2-anatase.

 

Keywords: layered compound, titanium dioxide, lepidocrocite, phase transformation, heat treatment

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DOI: https://doi.org/10.22146/ijc.21451

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Indonesian Journal of Chemisty (ISSN 1411-9420 / 2460-1578) - Chemistry Department, Universitas Gadjah Mada, Indonesia.

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