Reductive Preparation of Blue TiO2 via Deposition of Aluminum

doi:10.15541/jim20170538

Abstract

Abstract:

Improving catalysis efficiency and reducing production cost attract extensive interest for the study of photocatalyst. Herein a blue titania crystal with aluminum atoms modified on the surface was prepared by aluminum reduction and deposition. The blue titania displays a unique core-shell structure with crystallization nuclei inside and with oxygen vacancies and aluminum atoms outside. And the blue titania shows excellent photocatalytic and electrochemical performance under simulated sunlight. Under high vacuum, with vapored aluminum atoms being deposited on titania nanocrystals, Ti⁴⁺ is reduced to Ti³⁺, which creates a large number of oxygen vacancies on the surface. Additionally, moderate amounts of aluminum atoms coated on titania become photo-induced charge carrier traps, facilitating the separation and transport of charge carriers, which enhances the photocatalytic capability. TiO₂-Al_0.36 exhibits the best photocatalytic performance, degrading methyl orange in 8 min, and it shows excellent photochemical property with the photocurrent of 1.47 mA·cm^-2, which is more than 8 times as high as that of pristine titania (0.17 mA·cm^-2).

Key words: blue titania, aluminum reduction and deposition, photocatalysis, contaminant degradation, photoelectrochemistry

CLC Number:

TQ174

SHENG Peng, ZHAO Guang-Yao, XU Li, LIU Shuang-Yu, WANG Bo, LIU Hai-Zhen, MA Guang, HAN Yu, CHEN Xin. Reductive Preparation of Blue TiO₂ via Deposition of Aluminum[J]. Journal of Inorganic Materials, 2018, 33(9): 942-948.

Figures/Tables 8

Fig. 1 XRD patterns of intrinsic P25 and TiO2-x-Aly

Fig. 2 TEM (a), (c), (e) and HRTEM (b), (d), (f) images of intrinsic P25 and TiO2-x-Aly

Table 1 Elemental analysis of intrinsic P25 and TiO2-x-Aly

Samples	Elemental compositions/wt%
	XPS			ICP
	Ti	O	Al	Al
TiO₂(P25)	26.4	73.6	—	—
TiO_2-_x	39.4	60.6	—	—
TiO₂-Al_0.36	47.5	49.8	2.72	0.36
TiO₂-Al_1.37	35.8	59.0	5.19	1.37

Fig. 3 Photographs (a) and UV-Vis-NIR diffuse reflectance spectra of of intrinsic P25 and TiO2-x-Aly

Fig. 4 Raman (a) and EPR (b) spectra of intrinsic P25 and TiO2-x-Aly

Fig. 5 XPS spectra Ti2p (a), Ti2p3/2 (b), Al2p (c), and XPS valence band edge (d) of intrinsic P25 and TiO2-x-Aly

Fig. 6 PL spectra (a), photocatalytic degradation of methyl orange (b) of intrinsic P25 and TiO2-x-Aly and photocatalytic degradation of methyl orange (c) of TiO2-Al0.36

Fig. 7 (a) LSV curves under simulated sunlight irradiation, (b) transient photocurrent curve under full spectra irradiation (0.23 V vs. SCE), and Mott-Schottky curve with no sunlight irradiation at 1 kHz of intrinsic P25 and TiO2-x-Aly

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Reductive Preparation of Blue TiO₂ via Deposition of Aluminum

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