Correlation investigation on the visible-light-driven photocatalytic activity and coordination structure of rutile Sn-Fe-TiO2 nanocrystallites for methylene blue degradation

被引：26

作者：

Wang, Yanjie ^{[1
,2
,3
]}

Zhang, Yanjie ^{[1
,2
]}

Yu, Fuhai ^{[1
,2
,3
]}

Jin, Changzi ^{[1
,2
]}

Liu, Xin ^{[1
,2
]}

Ma, Jingyuan ^{[4
]}

Wang, Yu ^{[4
]}

Huang, Yuying ^{[4
]}

Wang, Junhu ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, Mossbauer Effect Data Ctr, Dalian 116023, Peoples R China

[2] Chinese Acad Sci, Dalian Inst Chem Phys, Lab Catalysts & New Mat Aerosp, Dalian 116023, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[4] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China

来源：

CATALYSIS TODAY | 2015年 / 258卷

基金：

中国国家自然科学基金;

关键词：

Codoping; XAFS; Mossbauer; Tetrahedral coordination; Optimized mole ratio; Oxygen vacancy; QUANTUM-SIZED TIO2; METAL-ION DOPANTS; DOPED TIO2; RHODAMINE-B; BAND-GAP; ANATASE; DYE; PERFORMANCE; SURFACE; UV;

D O I：

10.1016/j.cattod.2015.03.022

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Rutile Sn-Fe-TiO2 photocatalysts with high visible-light-driven activity were synthesized by an improved soft chemical solution process for investigating the potential correlation between their photocatalytic performance and coordination structure. The prepared photocatalysts were systematically characterized by XRD, BET, Raman, TEM, UV-vis, XPS, XAFS and Mossbauer techniques. Their photocatalytic performances were evaluated by degrading the model pollutant of methylene blue aqueous solution under visible light irradiation (lambda >= 400 nm). The results indicated that tin and iron ions could substitute Ti4+ in the rutile TiO2 lattice, and specially, iron ions were located at tetrahedrally coordinated titanium sites. Their visible-light-driven photocatalytic activities were found to culminate at a very low level of iron doping (Fe/Ti = similar to 0.1 at.%, Sn/Ti = 2.0 at.%), this was 5-fold of P25 and 2-fold of undoped rutile TiO2. It was confirmed that besides the high surface area, fine crystallinity, enhanced visible light absorption and optimized oxygen vacancy concentration, the mole ratio of tetrahedrally coordinated iron and titanium was also essential to modify their visible-light-driven photocatalytic properties. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：112 / 119

页数：8

共 53 条

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