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High-performance Ag2O/Bi2WO6 compound light catalyst and preparing method thereof

A technology of composite light and catalyst, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve unfavorable economical production, photogenerated electron-hole recombination rate Fast, complicated preparation steps, etc.

Inactive Publication Date: 2013-12-04
TIANJIN NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

But for this single system, there are still two problems that need to be solved: first, its absorption threshold is only about 460 nm, and the utilization rate of solar energy is still low; second, the recombination rate of photogenerated electrons and holes in semiconductors is very fast , so that the photon quantum efficiency is still relatively low
Since the law involves prior Bi 2 WO 6 Surface impregnated AgNO 3 , and then burn at 350°C. The preparation steps are not only relatively cumbersome and energy-consuming, but also have a high Ag content, which is not conducive to economical production.

Method used

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  • High-performance Ag2O/Bi2WO6 compound light catalyst and preparing method thereof
  • High-performance Ag2O/Bi2WO6 compound light catalyst and preparing method thereof
  • High-performance Ag2O/Bi2WO6 compound light catalyst and preparing method thereof

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Effect test

preparation example Construction

[0038] Bi 2 WO 6 Powder preparation method:

[0039] Weigh 0.3881 g (0.8 mmol) Bi(NO 3 ) 3 ·5H 2 O was dissolved in 17 mL of distilled water, and under vigorous magnetic stirring, 0.1319 g (0.4 mmol) of Na 2 WO 4 2H 2 O. After continuing to stir for 30 min, the white suspension was transferred to a 25 mL hydrothermal reactor, and reacted at a constant temperature of 160 °C for 12 h. After natural cooling to room temperature, the product was centrifuged, washed and dried to obtain pale yellow Bi 2 WO 6 Ultrastructure powder. The 5mg photocatalyst was illuminated by a 500W xenon lamp for 20min to 10mL 10 -5 The degradation rate of the M RhB test solution was 60%.

[0040] Ag 2 O / Bi 2 WO 6 The preparation example of the composite photocatalyst is as follows.

Embodiment 1

[0042] Weigh 0.1g Bi 2 WO 6 powder in a 50 mL beaker, add 2.0 mL (0.59×10 -3 mol / L) AgNO 3 Stock solution, stirred at room temperature for 20min, then added with AgNO 3 Equal metering ratio (0.25×10 -3 mol / L) NaOH stock solution 2.0 mL, continue to stir for 20 min, then centrifuge the precipitate, wash, and dry at 60°C, collect the brown-black powder to obtain Ag with a wt.% of 0.2% 2 O / Bi 2 WO 6 catalyst of light. The 5mg photocatalyst was illuminated by a 500W xenon lamp for 20min to 10mL 10 -5 The degradation rate of M RhB test solution was 72.6%.

Embodiment 2

[0044] Weigh 0.1g Bi 2 WO 6 powder in a 50 mL beaker, add 6.0 mL (0.59×10 -3 mol / L) AgNO 3 Stock solution, stirred at room temperature for 20min, then added with AgNO 3 Equal metering ratio (0.25×10 -3 mol / L) NaOH stock solution 6.0ml, continue to stir for 30min, then centrifuge the precipitate, wash, and dry at 60°C, collect brown-black powder to obtain Ag with 0.6% Ag wt.% 2 O / Bi 2 WO 6 catalyst of light. The 5mg photocatalyst was illuminated by a 500W xenon lamp for 20min to 10mL 10 -5 The degradation rate of the M RhB test solution was 99.2%.

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Abstract

The invention discloses a high-performance Ag2O / Bi2WO6 compound light catalyst and a simple preparing method thereof. The method comprises the steps that AgNO3 and NaOH of equal stoichiometric ratio serve as initial reactants at room temperature under the condition of ordinary pressure, chemical depositing is performed on the surfaces of Bi2WO6 particles in a one-step mode to generate Ag2O by utilizing ultra instability of AgOH, and the Ag2O / Bi2WO6 compound light catalyst is obtained. Research results show that not only can Ag2O modification broaden the visible light absorption range of the Bi2WO6, but also the compounding probability of photon-generated carriers of a semiconductor can be effectively inhibited. Furthermore, the photocatalytic activity of the compound catalyst is obviously improved when the mass percent of the chemical element Ag is within the range of 0.2%-3.4%, when an Ag wt. % equals 0.6 %, the photocatalytic activity is optimized, and the kinetic constant of the photocatalytic activity is 4.7 times of the net Bi2WO6. Moreover, the compound light catalyst shows good reusability in degrading organic dyestuffs. The simple preparing method of the high-performance Ag2O / Bi2WO6 compound light catalyst and the reusability predict good application prospects of the compound light catalyst.

Description

technical field [0001] The invention belongs to the technical field of water body pollution protection, relates to industrial water treatment technology, more specifically a high-performance Ag 2 O / Bi 2 WO 6 Composite photocatalyst and preparation method thereof. Background technique [0002] The water pollution caused by the rapid development of industrial production is one of the problems to be solved urgently in today's society. Compared with the currently commonly used industrial water treatment technologies such as biochemical methods and precipitation methods, photocatalytic oxidation has become the key to solving environmental water pollution problems due to its advantages such as low energy consumption, mild purification conditions, no secondary pollution, and deep oxidation. technology. Traditional photocatalyst TiO 2 Due to the wide band gap energy (3.0~3.2 eV), only about 3% of sunlight can be used for ultraviolet light, and the utilization rate of solar ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68C02F1/30
CPCY02W10/37
Inventor 张国英吴青松崔燕
Owner TIANJIN NORMAL UNIVERSITY
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