Ti3+ self-doped rutile/anatase/TiO2(B) mixed-crystal tri-phase heterojunctions as effective visible-light-driven photocatalysts

被引:45
作者
Kuang, Junyan [1 ]
Xing, Zipeng [1 ]
Yin, Junwei [1 ]
Li, Zhenzi [2 ]
Tan, Siyu [1 ]
Li, Meng [1 ]
Jiang, Jiaojiao [1 ]
Zhu, Qi [1 ]
Zhou, Wei [1 ]
机构
[1] Heilongjiang Univ, Key Lab Funct Inorgan Mat Chem, Minist Educ Peoples Republ China, Sch Chem & Mat Sci,Dept Environm Sci, Harbin 150080, Heilongjiang, Peoples R China
[2] Harbin Med Univ, Dept Epidemiol & Biostat, Harbin 150086, Heilongjiang, Peoples R China
基金
中国国家自然科学基金;
关键词
TiO2; Visible-light-driven photocatalysis; Tri-phase heterojunction; Ti3+ self-doped; Pollutants degradation; ANATASE TIO2; BLACK TIO2; CHARGE SEPARATION; ENERGY-CONVERSION; ANODE MATERIAL; PERFORMANCE; NANOPARTICLES; NANOSHEETS; REDUCTION; ARCHITECTURES;
D O I
10.1016/j.arabjc.2018.06.010
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Ti3+ self-doped rutile/anatase/TiO2(B) mixed-crystal tri-phase heterojunctions photocatalysts are fabricated via hydrothermal approach and mechanochemical process, followed by in-situ solid-state chemical reduction approach. The as-prepared samples are characterized by X-ray diffraction, Raman, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-vis diffuse reflectance spectroscopy. The photocatalysts are consisted by anatase/rutile TiO2 nanoparticles and 1D TiO2(B) single-crystalline nanorods, which form rutile/anatase/TiO2(B) tri-phase heterojunctions. The visible-light-driven photocatalytic degradation rates of methyl orange and phenol are up to similar to 98 and 97%, which are 2.2 and 1.8 times higher than that of commercial Degussa P25, 2.3 and 2.2 times higher than that of pure TiO2(B) as well. The enhancement can be attributed to the synergistic effect of special nanostructure, tri-phase heterojunctions, oxygen vacancy and Ti3+ self-doping, which facilitates the absorption of visible light and the spatial separation of photo-generated charge carriers. This work provides a new perspective for designing high-active visible-light-driven photocatalyst in future. (C) 2018 Production and hosting by Elsevier B.V. on behalf of King Saud University.
引用
收藏
页码:2568 / 2578
页数:11
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