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Method for preparing visible light catalyst of Nano crystal BiVO4 in high activity through ultrasound chemistry

A photocatalyst and ultrasonic chemistry technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. problem, to achieve the effect of short cycle, uniform distribution and simple preparation process

Inactive Publication Date: 2008-11-19
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the methods have problems such as time-consuming energy consumption, high cost due to complex process, and inhomogeneous microstructure affecting performance.

Method used

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  • Method for preparing visible light catalyst of Nano crystal BiVO4 in high activity through ultrasound chemistry
  • Method for preparing visible light catalyst of Nano crystal BiVO4 in high activity through ultrasound chemistry
  • Method for preparing visible light catalyst of Nano crystal BiVO4 in high activity through ultrasound chemistry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] BiVO 4 Using Bi(NO 3 ) 3 ·5H 2 O and NH 4 VO 3 (Analytical pure) is synthesized as raw material, according to stoichiometric ratio, weighs 0.97g Bi(NO 3 ) 3 ·5H 2 O (analytical grade) was dissolved in 70 mL of water, and then 0.234 g of NH 4 VO 3 (analytical pure), stirring to form a yellow suspension precursor. Then immerse the ultrasonic probe in it for ultrasonic treatment. After comparative experiments, the diameter of the titanium alloy working probe is selected to be 0.6cm, the power of the ultrasonic wave is 500W, and the reaction time is 1h. After the reaction, the obtained yellow precipitate was filtered, washed three times with deionized water, then washed three times with absolute ethanol, and then dried at 80°C. Such as figure 1 , by XRD component analysis and Debye Scherer formula calculation, the monoclinic phase BiVO of about 50nm was obtained 4 Nanocrystalline. figure 2 Among them, A and B are typical scanning electron micrographs of differ...

Embodiment 2

[0032] BiVO 4 Use BiCl 3 and NH 4 VO 3 Synthesize as raw material, according to stoichiometric ratio, weigh 0.631g BiCl 3 (analytical pure) was dissolved in 70mL water, then added 0.2g polyethylene glycol (PEG20000), stirred for 30 minutes, then added 0.234g NH 4 VO 3 (analytical pure), stirring to form a yellow suspension precursor. Then immerse the ultrasonic probe in it for ultrasonic treatment, the ultrasonic power is 600W, and the reaction time is 1h. After the reaction, the obtained yellow precipitate was filtered, washed three times with deionized water, then washed three times with absolute ethanol, and then dried at 80°C. The product was determined to be monoclinic phase BiVO by XRD component analysis 4 , the particle size observed by an electron microscope is about 200nm, and the visible light degradation experiment result of wavelength λ>400nm is slightly lower than that of Example 1, and the degradation rate is 70%.

Embodiment 3

[0034] BiVO 4 Use BiCl 3 and NH 4 VO 3 Synthesize as raw material, according to stoichiometric ratio, weigh 0.631g BiCl 3 (analytical pure) was dissolved in 70mL of water, then added 0.2g cetyltrimethylammonium bromide (CTAB), stirred for 30 minutes, then added 0.234g NH 4 VO 3 (analytical pure), stirring to form a yellow suspension precursor. Then immerse the ultrasonic probe in it for ultrasonic treatment, the ultrasonic power is 600W, and the reaction time is 1h. After the reaction, the obtained yellow precipitate was filtered, washed three times with deionized water, then washed three times with absolute ethanol, and then dried at 60°C. XRD component analysis showed that the product was monoclinic phase BiVO 4 , the particle size of the product is about 500nm according to scanning electron microscope analysis. The visible light degradation experiment of methyl orange with wavelength λ>400nm shows that the visible light photocatalytic performance of the product prep...

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Abstract

An ultrasonic-chemical process for preparing the high-activity nano-crystal visual-light photcatalyst BiVO4 for fast degradating organic pollutant is prepared through dissolving the Bi ion contained nitrate (or chloride or oxalate) in distilled water, proportionally adding the V ion contained meta-vanadate, stirring to become yellow suspension, ultrasonic treating to obtain yellow deposit, filtering, washing and drying.

Description

technical field [0001] The invention relates to the preparation and application of visible light-responsive photocatalysts, in particular to BiVO 4 Sonochemical preparation of nanocrystals and their use to decompose harmful chemicals under visible light irradiation. Background technique [0002] Due to the increasing environmental pollution and energy crisis in the world, the research and application of semiconductor photocatalysis have attracted widespread attention. Photocatalytic technology utilizes the characteristic that the surface energy of the catalyst is activated under light. When the semiconductor photocatalyst is irradiated with a light wave whose energy is equal to or greater than the bandgap energy of the semiconductor, the electrons in the valence band (e - ) will be excited to the conduction band and migrate to the surface of the particle under the action of an electric field, forming holes in the valence band (h + ), resulting in highly active hole / electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/16
Inventor 王文中周林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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