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Sodium doping in brookite TiO2 enhances its photocatalytic activity.


ABSTRACT: We report in this work that sodium doping of brookite TiO2 effectively enhances its photocatalytic activity, which becomes three times higher than that of the quasi-spherical brookite TiO2. The results demonstrated that the sodium-doped brookite Na x Ti1- x O2 can be stable up to 500 °C. At 600°C, the sodium in the brookite precipitates in the form of Na2CO3, and above 700 °C, the brookite Na x Ti1- x O2 transforms into Na2Ti6O13 by a twinning process with the orientation relationship of [1-2-3]Matrix//[1-23]Twins and (-2-10)Matrix//(1-1-1)Twins. The differences in the ionic radius and the electronegativity between Na and Ti destroy the local atomic arrangement of the brookite structure and produce microstructures such as the core-shell structure, local lattice distortion, interstitial atoms, and atomic vacancies, which are critical to its excellent photocatalytic activity.

SUBMITTER: Zhuang B 

PROVIDER: S-EPMC9273989 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature

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Sodium doping in brookite TiO<sub>2</sub> enhances its photocatalytic activity.

Zhuang Boxiang B   Shi Honglong H   Zhang Honglei H   Zhang Zeqian Z  

Beilstein journal of nanotechnology 20220705


We report in this work that sodium doping of brookite TiO<sub>2</sub> effectively enhances its photocatalytic activity, which becomes three times higher than that of the quasi-spherical brookite TiO<sub>2</sub>. The results demonstrated that the sodium-doped brookite Na <i><sub>x</sub></i> Ti<sub>1-</sub> <i><sub>x</sub></i> O<sub>2</sub> can be stable up to 500 °C. At 600°C, the sodium in the brookite precipitates in the form of Na<sub>2</sub>CO<sub>3</sub>, and above 700 °C, the brookite Na <i  ...[more]

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