期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 343, 期 -, 页码 181-190出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.09.031
关键词
Mesoporous TiO2; Heterojunction; Surface plasma resonance; G-C3N4 sheets; Visible-light-driven photocatalysis
资金
- National Natural Science Foundation of China [21376065, 51672073, 81573134]
- Postdoctoral Science Foundation of China [2017M611399]
- Heilongjiang Postdoctoral Startup Fund [LBH-Q14135]
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2015014, UNPYSCT-2016018]
- Postdoctoral Science Foundation of Heilongjiang Province [LBH-Z16150]
- Postgraduate Innovative Science Research Project of Heilongjiang University [YJSCX2017-164HLJU]
- Innovative Science Research Project of Harbin Medical University [2016JCZX13]
3D mesoporous black TiO2-x/Ag nanosphere coupled with 2D g-C3N4 sheet ternary heterojunctions are successfully fabricated through a facile evaporation-induced self-assembly (EISA) process and photodeposition method, followed by a mild calcination (350 degrees C) under an argon atmosphere after an in situ solid-state chemical reduction strategy. The resultant mesoporous black TiO2-x/Ag/g-C3N4 ternary heterojunctions with narrow band gap of similar to 2.27 eV possess a relative high specific surface area of similar to 100 m(2) g(-1), main pore size of 6.2 nm and the highest visible-light-driven photocatalytic property for degradation of methyl orange (97%) and methylene blue (99%). The apparent reaction rate constants (k) of mesoporous black TiO2-x/Ag/g-C3N4 for methyl orange and methylene blue are 9 and 11 times higher than that of pristine TiO2. The possible mechanism is proposed, and the excellent photocatalytic property can be ascribed to the introduction of Ti3+ self-doping and g-C3N4, which favor the visible light absorption and the separation of electron-hole pairs, the surface plasma resonance effect of Ag nanoparticle, and the mesoporous networks offer more surface active sites. (C) 2017 Elsevier B.V. All rights reserved.
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