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Preparation and Research of New Type Visible-light Active Photocatalyst BIVO4

Author: LiuHongWei
Tutor: ZengDaWen
School: Huazhong University of Science and Technology
Course: Materials Science
Keywords: Bismuth vanadate Carbon-doped Pore ??structure Water bath synthesis Photocatalytic
CLC: O643.36
Type: Master's thesis
Year: 2011
Downloads: 81
Quote: 0
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Abstract


Bismuth vanadate (BiVO 4 ) has three main polymorphs: monoclinic scheelite structure, tetragonal scheelite structure and tetragonal zircon structure. Monoclinic scheelite BiVO 4 band gap of about 2.4ev visible light absorption characteristics, to overcome the shortcomings of traditional photocatalyst titanium dioxide can only absorb UV light, has been more and more attention . This paper focuses on the research the monoclinic BiVO 4 carbon doped modified by new synthesis method to achieve the large surface area of ??BiVO 4 synthesis. Absorbent as a carbon source, by dipping - the calcination method successfully synthesized carbon doped BiVO 4 , and study the different calcination temperature on the amount of carbon-doped and the band gap. Experimental studies have shown: calcined above 500 ℃ cotton precursor to carbon-doped BiVO 4 , and as the temperature rises further, BiVO 4 carbon doped amount gradually increase, however, when the temperature is higher than 650 ℃ BiVO 4 , the amount of carbon-doped worse. Meanwhile, carbon doped BiVO 4 bandgap varies also with the calcining temperature changes, when the temperature was 650 ° C, the catalyst band gap is minimum. The photocatalytic tests to rhodamine B as the target degradation products, carbon doped BiVO 4 sample photodegradation effect is the solid phase were prepared monoclinic BiVO of greater than 420nm visible light irradiation 2h 4 12-fold. To explore BiVO 4 synthesis of new methods to ethylene glycol (EG) as solvent and soft template agent by water bath - the calcination method initial realization of large specific surface area BiVO 4 4 . Prepared under the longer incubation time and lower calcination temperature of BiVO 4 of large specific surface area (waterbath incubated for 7 days at 400 ℃ calcined sample: 13.29m2 · g-1), much higher than the solid phase prepared BiVO 4 , the specific surface area. Degradation of Rhodamine B through the liquid phase results show that: the use of the method of preparation of BiVO 4 420nm visible light irradiation after 4h degradation efficiency reached 80%. Based on the basis of a series of characterization conclusions glycol as template the formation of three-dimensional communicating hole formation mechanism of preliminary explanation.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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