Enhanced photocatalytic activity of Bi₂WO₆ with oxygen vacancies by zirconium doping
To overcome the drawback of low photocatalytic efficiency brought by electron–hole recombination, Bi₂WO₆ photocatalysts with oxygen vacancies were synthesized by zirconium doping. The oxygen vacancies as the positive charge centers can trap the electron easily, thus inhibiting the recombination of c...
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| Published in | Journal of hazardous materials Vol. 196; pp. 255 - 262 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Kidlington
Elsevier B.V
30.11.2011
Elsevier |
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| Online Access | Get full text |
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| Abstract | To overcome the drawback of low photocatalytic efficiency brought by electron–hole recombination, Bi₂WO₆ photocatalysts with oxygen vacancies were synthesized by zirconium doping. The oxygen vacancies as the positive charge centers can trap the electron easily, thus inhibiting the recombination of charge carriers and prolonging the lifetime of electron. Moreover, the formation of oxygen vacancies favors the adsorption of O₂ on the semiconductor surface, thus facilitating the reduction of O₂ by the trapped electrons to generate superoxide radicals, which play a key role in the oxidation of organics. Visible-light-induced photodegradation of rhodamine B (RhB) and phenol were carried out to evaluate the photoactivity of the products. The results showed that oxygen-deficient Bi₂WO₆ exhibited much enhanced photoactivity than the Bi₂WO₆ photocatalyst free of oxygen deficiency. This work provided a new concept for rational design and development of high-performance photocatalysts. |
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| AbstractList | To overcome the drawback of low photocatalytic efficiency brought by electron-hole recombination, Bi(2)WO(6) photocatalysts with oxygen vacancies were synthesized by zirconium doping. The oxygen vacancies as the positive charge centers can trap the electron easily, thus inhibiting the recombination of charge carriers and prolonging the lifetime of electron. Moreover, the formation of oxygen vacancies favors the adsorption of O(2) on the semiconductor surface, thus facilitating the reduction of O(2) by the trapped electrons to generate superoxide radicals, which play a key role in the oxidation of organics. Visible-light-induced photodegradation of rhodamine B (RhB) and phenol were carried out to evaluate the photoactivity of the products. The results showed that oxygen-deficient Bi(2)WO(6) exhibited much enhanced photoactivity than the Bi(2)WO(6) photocatalyst free of oxygen deficiency. This work provided a new concept for rational design and development of high-performance photocatalysts.To overcome the drawback of low photocatalytic efficiency brought by electron-hole recombination, Bi(2)WO(6) photocatalysts with oxygen vacancies were synthesized by zirconium doping. The oxygen vacancies as the positive charge centers can trap the electron easily, thus inhibiting the recombination of charge carriers and prolonging the lifetime of electron. Moreover, the formation of oxygen vacancies favors the adsorption of O(2) on the semiconductor surface, thus facilitating the reduction of O(2) by the trapped electrons to generate superoxide radicals, which play a key role in the oxidation of organics. Visible-light-induced photodegradation of rhodamine B (RhB) and phenol were carried out to evaluate the photoactivity of the products. The results showed that oxygen-deficient Bi(2)WO(6) exhibited much enhanced photoactivity than the Bi(2)WO(6) photocatalyst free of oxygen deficiency. This work provided a new concept for rational design and development of high-performance photocatalysts. To overcome the drawback of low photocatalytic efficiency brought by electron–hole recombination, Bi₂WO₆ photocatalysts with oxygen vacancies were synthesized by zirconium doping. The oxygen vacancies as the positive charge centers can trap the electron easily, thus inhibiting the recombination of charge carriers and prolonging the lifetime of electron. Moreover, the formation of oxygen vacancies favors the adsorption of O₂ on the semiconductor surface, thus facilitating the reduction of O₂ by the trapped electrons to generate superoxide radicals, which play a key role in the oxidation of organics. Visible-light-induced photodegradation of rhodamine B (RhB) and phenol were carried out to evaluate the photoactivity of the products. The results showed that oxygen-deficient Bi₂WO₆ exhibited much enhanced photoactivity than the Bi₂WO₆ photocatalyst free of oxygen deficiency. This work provided a new concept for rational design and development of high-performance photocatalysts. To overcome the drawback of low photocatalytic efficiency brought by electron-hole recombination, Bi2WO6 photocatalysts with oxygen vacancies were synthesized by zirconium doping. The oxygen vacancies as the positive charge centers can trap the electron easily, thus inhibiting the recombination of charge carriers and prolonging the lifetime of electron. Moreover, the formation of oxygen vacancies favors the adsorption of O2 on the semiconductor surface, thus facilitating the reduction of O2 by the trapped electrons to generate superoxide radicals, which play a key role in the oxidation of organics. Visible-light-induced photodegradation of rhodamine B (RhB) and phenol were carried out to evaluate the photoactivity of the products. The results showed that oxygen-deficient Bi2WO6 exhibited much enhanced photoactivity than the Bi2WO6 photocatalyst free of oxygen deficiency. This work provided a new concept for rational design and development of high-performance photocatalysts. To overcome the drawback of low photocatalytic efficiency brought by electron-hole recombination, Bi(2)WO(6) photocatalysts with oxygen vacancies were synthesized by zirconium doping. The oxygen vacancies as the positive charge centers can trap the electron easily, thus inhibiting the recombination of charge carriers and prolonging the lifetime of electron. Moreover, the formation of oxygen vacancies favors the adsorption of O(2) on the semiconductor surface, thus facilitating the reduction of O(2) by the trapped electrons to generate superoxide radicals, which play a key role in the oxidation of organics. Visible-light-induced photodegradation of rhodamine B (RhB) and phenol were carried out to evaluate the photoactivity of the products. The results showed that oxygen-deficient Bi(2)WO(6) exhibited much enhanced photoactivity than the Bi(2)WO(6) photocatalyst free of oxygen deficiency. This work provided a new concept for rational design and development of high-performance photocatalysts. |
| Author | Xu, Jiehui Gao, Erping Shang, Meng Wang, Wenzhong Zhang, Zhijie |
| Author_xml | – sequence: 1 fullname: Zhang, Zhijie – sequence: 2 fullname: Wang, Wenzhong – sequence: 3 fullname: Gao, Erping – sequence: 4 fullname: Shang, Meng – sequence: 5 fullname: Xu, Jiehui |
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| Snippet | To overcome the drawback of low photocatalytic efficiency brought by electron–hole recombination, Bi₂WO₆ photocatalysts with oxygen vacancies were synthesized... To overcome the drawback of low photocatalytic efficiency brought by electron-hole recombination, Bi(2)WO(6) photocatalysts with oxygen vacancies were... To overcome the drawback of low photocatalytic efficiency brought by electron-hole recombination, Bi2WO6 photocatalysts with oxygen vacancies were synthesized... |
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| SubjectTerms | Adsorption Applied sciences Bismuth - chemistry Catalysis Catalytic reactions Charge Chemical engineering Chemistry Doping Electron Transport electrons Exact sciences and technology General and physical chemistry hypoxia Light Microscopy, Electron, Transmission oxidation oxygen Oxygen - chemistry phenol Phenol - isolation & purification Photocatalysis photocatalyst Photocatalysts Photochemical Processes Photoelectron Spectroscopy photolysis Pollution Reactors Rhodamines - isolation & purification Semiconductors Solutions superoxide anion Surface chemistry Surface Properties Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry Time Factors Tungsten Compounds - chemistry Vacancies X-Ray Diffraction Zirconium Zirconium - chemistry |
| Title | Enhanced photocatalytic activity of Bi₂WO₆ with oxygen vacancies by zirconium doping |
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