Enhancement of Visible-Light Photocatalytic Efficiency of TiO2Nanopowder by Anatase/Rutile Dual Phase Formation

被引：8

作者：

Chen, Yi-Jia ^{[1
,2
]}

Lin, Tse-Shan ^{[1
]}

机构：

[1] Natl Dong Hwa Univ, Dept Mat Sci & Engn, 1,Sect 2,Da Hsueh Rd, Hualien 97401, Taiwan

[2] Natl Dong Hwa Univ, Dept Optoelect Engn, 1,Sect 2,Da Hsueh Rd, Hualien 97401, Taiwan

来源：

APPLIED SCIENCES-BASEL | 2020年 / 10卷 / 18期

关键词：

titanium oxide; anatase; rutile; nucleation; photonic center; photocatalyst; dual phases; phase transformation; visible light; nanopowder; TO-RUTILE TRANSFORMATION; TITANIUM-DIOXIDE; OPTICAL-PROPERTIES; AMORPHOUS TITANIA; TIO2; CARBON; TEMPERATURE; MECHANISMS;

D O I：

10.3390/app10186353

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Visible-light photocatalytically active titanium oxide (TiO2) nano-powder was synthesized by a flat-flame chemical vapor condensation method. The formation of TiO(2)consisting of different ratios of anatase and rutile phases was controlled by two parameters: the acetylene flow rate (C2H2, 600 sccm and 800 sccm) and the acetylene/oxygen flow ratio (C2H2/O-2, 1:3, 1:4, 1:5, and 1:6). The location of the photonic center was identified for visible-light absorption, which is in the anatase grains. The photonic center on the surface of anatase grains happens to be the nucleation site for rutile in an oxygen-deficient environment. The visible-light absorption could be attributed to the formation of defect levels related to the photonic center within the band gap of anatase. The major role of the mixed-phase structure of TiO(2)in the enhancement of visible-light photocatalytic activity is in the enhancement of carrier separation and not of light harvest, for the powder produced in this study.

引用

页数：11

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