Preparation of g-C^sub 3^N^sub 4^/TiO^sub 2^/BiVO^sub 4^ composite and its application in photocatalytic degradation of pollutant from TATB production under visible light irradiation

A novel and highly efficient ternary mpg-C3N4/BiVO4/TiO2 composite was successfully synthesized and characterized with regard to structure, chemical composition, optical properties and degradation application. The photocatalytic activities of as-prepared samples were evaluated by the photocatalytic...

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Published inJournal of photochemistry and photobiology. A, Chemistry. Vol. 358; p. 246
Main Authors Zhao, Zhiren, Zhang, Weiyan, Shen, Xinlin, Muhmood, Tahir, Xia, Mingzhu, Lei, Wu, Wang, Fengyun, Khan, Muhammad Asim
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier BV 01.05.2018
Subjects
Alkylation
Amination
Amino acids
Bismuth oxides
Calcium
Carbon nitride
Catalysis
Catalytic activity
Chemical composition
Chemical synthesis
Composite materials
Current carriers
Energy gap
Environmental degradation
Irradiation
Light irradiation
Methylene blue
Optical properties
Organic chemistry
Photocatalysis
Photodegradation
Pollutants
Polycyclic aromatic hydrocarbons
Radiation
TATB
Thermal stability
Titanium dioxide
Vanadates
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Summary:A novel and highly efficient ternary mpg-C3N4/BiVO4/TiO2 composite was successfully synthesized and characterized with regard to structure, chemical composition, optical properties and degradation application. The photocatalytic activities of as-prepared samples were evaluated by the photocatalytic decomposition of methylene blue (MB), practical effluent from alkylation and amination steps in 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) production. Compared with TiO2, BiVO4, and mpg-C3N4, the binary composites TiO2/BiVO4 and the ternary mpg-C3N4/BiVO4/TiO2 composites exhibited the higher photocatalytic activity under visible light irradiation. Compared to solo mpg-C3N4 and BiVO4, the photocatalytic efficiency of g-C3N4/TiO2/BiVO4 raised up to 94%. The catalytic activity of g-C3N4/TiO2/BiVO4 against TATB (alkylation and amination) also confirms its efficiency by creating intermediate which were detected by Q-TOF-MS. The thermal stability and photo-stability of the produced composites were investigated. From the view of practical application, mpg-C3N4/BiVO4/TiO2 displayed superior photostability after five times recycle. The mechanism research showed the fitting of band structure among BiVO4, g-C3N4, and TiO2. The presence of mpg-C3N4 and BiVO4 can notably adjust the band gap energy and the synergy effects of them can prolong the lifetime of the charge carrier.
ISSN:1010-6030
1873-2666