Nanosized low-temperature phases of titanium(IV) oxide with anatase and η-phase structures: composition, structure, and photocatalytic properties

Journal Article · Wed Aug 15 00:00:00 EDT 2018 · Russian Chemical Bulletin

DOI:https://doi.org/10.1007/S11172-018-2224-2· OSTI ID:22863310

Kuz’micheva, G. M. ^[1]; Vasil’eva, I. G. ^[2]

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1. Russian Technological University (Institute of Fine Chemical Technologies) (Russian Federation)
2. Siberian Branch of the Russian Academy of Sciences, A. V. Nikolaev Institute of Inorganic Chemistry (Russian Federation)

Nanosized low-temperature modifications of titanium(IV) oxide with the anatase and η-phase (TiO{sub 2–x}•mH{sub 2}O) structures were prepared by the sulfate method (pH <3) and for the first time characterized by a complex of methods (X-ray diffractometry, scanning electron microscopy, IR spectroscopy, Raman spectroscopy, differential scanning calorimetry, low-temperature sorption capacity of samples to nitrogen, and differentiating dissolution). The physicochemical properties of the modifications were compared. Differences in compositions of the surface and volumes of the samples, compositions and structures of the phases (structure of η-phase is superstructure to anatase), and microstructure elements (sizes of crystallites, nanoparticles, and specific surface area; volume of nano- and ultrananopores) were revealed. The region of η-phase stability was found in the coordinates of temperature (T = 50–95 °C) and hydrolysis duration (τ = 10–80 min) and temperature (T≤200 °C) and annealing duration (τ <6 h). The distinctions in the thermal behavior of the nanosized anatase and η-phase were studied. The photocatalytic activity (PCA) is determined by the physicochemical characteristics of the samples and phases and also by the composition and structure of the decomposed substrate. In the case of difenoxazole, the PCA is affected by the compositions of the samples, phases, and surface (the presence of OH groups) and specific surface area, whereas the composition of the samples and specific surface area affect the PCA in the case of thiamethoxam.

• OSTI ID: 22863310
• Journal Information: Russian Chemical Bulletin, Vol. 67, Issue 8; Other Information: Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; Country of input: International Atomic Energy Agency (IAEA); ISSN 1066-5285
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ANNEALING
CALORIMETRY
DISSOLUTION
HYDROLYSIS
INFRARED SPECTRA
MICROSTRUCTURE
NANOPARTICLES
NANOSTRUCTURES
NITROGEN
PESTICIDES
PH VALUE
PHASE STABILITY
PHOTOCATALYSIS
RAMAN SPECTROSCOPY
SCANNING ELECTRON MICROSCOPY
SPECIFIC SURFACE AREA
SULFATES
TITANIUM OXIDES
X-RAY DIFFRACTION