Hydrothermal Synthesis of γ-WO3 and h-WO3 Powders in the Presence of Citric Acid and Their Photoprotective Properties

Авторы: Filippova A.D., Rumyantsev A.A., Baranchikov A.E., Kolesnik I.V., Ivanova O.S., Efimov N.N., Khoroshilov A.V., Ivanov V.K.
Журнал: Russian Journal of Inorganic Chemistry
Том: 67
Номер: 6
Год издания: 2022
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 780
Последняя страница: 789
DOI: 10.1134/s0036023622060080
Аннотация: A selective method was proposed to produce single-phase powders of tungsten(VI) oxide γ-WO3 (monoclinic system) and h-WO3 (hexagonal system) by hydrothermal treatment (180–220°C) of ammonium B-paratungstate in the presence of citric acid (in a molar ratio of tungsten to citric acid of 1 : 1 or 1 : 2.5) in the pH range 0.5–2.5. The starting value of the pH of the reaction mixtures has a key effect on the phase composition of the synthesis products: single-phase γ-WO3 powders can form at temperatures of 180–220°C at pH 0.5–1.0, and an increase in pH to 2.0–2.5 favors the formation of h-WO3. For the first time, estimation was made of the sun protection factor SPF and UV-A protection factor UVAPF of the γ-WO3 and h-WO3 powders according to a standardized measurement procedure (GOST ISO 24443-2016).
Добавил в систему: Колесник Ирина Валерьевна

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