Preparation method of metavanadic silver/silver/silver phosphate composite catalyst

A composite catalyst, silver metavanadate technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems that plague the development of photocatalysts, improve the efficiency of photogenerated electrons, and strengthen electron transfer. , to avoid the effect of cavity recombination

Active Publication Date: 2014-08-20
无锡智慧兴宜信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of recombination of photogenerated ...

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] Weigh 24mmol AgNO 3 , configured as 20mmol / L AgNO 3 Solution, weigh 8mmol Na 2 HPO 4 , configured as 20mmol / L Na 2 HPO 4 Solution, weigh 2mmol thiourea and add to Na 2 HPO 4 solution; the above two solutions were mixed at a speed of 400 rpm to form a yellow-green gelatinous substance, which was continuously stirred for 4 hours. During the stirring process, Na 2 HPO 4 and AgNO 3 reaction to generate silver phosphate colloid doped with thiourea; prepare 0.2mol / L AgNO 3 solution and 0.2mol / L NH 4 VO 3 solution, by AgNO 3 : NH 4 VO 3 =1.05:1 molar ratio, the NH 4 VO 3 solution was added dropwise to AgNO 3 In the solution, stir while adding dropwise, and continue to stir for 15 minutes after the dropwise addition is completed; then transfer to a polytetrafluoroethylene-lined reaction kettle, and react at 180° C. for 25 hours. After the reaction, cool to room temperature, wash with deionized water and absolute ethanol, and dry at -60°C for 12 hours to obtain ...

Embodiment 2

[0018] Weigh 20mmol AgNO 3 , configured as 20mmol / L AgNO 3 Solution, weigh 6.6mmol Na 2 HPO 4 , configured as 20mmol / L Na 2 HPO 4 Solution, weigh 1mmol thiourea and add to Na 2 HPO 4 solution; the above two solutions were mixed at a speed of 350 rpm to form a yellow-green gelatinous substance, which was continuously stirred for 3 hours. During the stirring process, Na 2 HPO 4 and AgNO 3 reaction to generate silver phosphate colloid doped with thiourea; prepare 0.2mol / L AgNO 3 solution and 0.2mol / L NH 4 VO 3 solution, by AgNO 3 : NH 4 VO 3 =1.05:1 molar ratio, the NH 4 VO 3 solution was added dropwise to AgNO 3 In the solution, stir while adding dropwise, and continue to stir for 15 minutes after the dropwise addition is completed; then transfer to a polytetrafluoroethylene-lined reaction kettle, and react at 180° C. for 25 hours. After the reaction, cool to room temperature, wash with deionized water and absolute ethanol, and dry at 60°C for 12 hours to obtain...

Embodiment 3

[0021] Weigh 20mmol AgNO 3 , configured as 20mmol / L AgNO 3 Solution, weigh 7mmol Na 2 HPO 4 , configured as 20mmol / L Na 2 HPO 4 Solution, weigh 1.5mmol thiourea and add to Na 2 HPO 4 solution; the above two solutions were mixed at a speed of 400 rpm to form a yellow-green gelatinous substance, which was continuously stirred for 4 hours. During the stirring process, Na 2 HPO 4 and AgNO 3 reaction to generate silver phosphate colloid doped with thiourea; prepare 0.2mol / L AgNO 3 solution and 0.2mol / L NH 4 VO 3solution, by AgNO 3 : NH 4 VO 3 =1.1:1 molar ratio, the NH 4 VO 3 solution was added dropwise to AgNO 3 In the solution, stir while adding dropwise, and continue to stir for 15 minutes after the dropwise addition is completed; then transfer to a polytetrafluoroethylene-lined reaction kettle, and react at 180° C. for 25 hours. After the reaction, cool to room temperature, wash with deionized water and absolute ethanol, and dry at 55°C for 12 hours to obtain A...

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Abstract

The invention discloses a preparation method of a metavanadic silver/silver/silver phosphate composite catalyst. The preparation method comprises the following specific steps: mixing the prepared AgNO3 solution with the concentration of 20 mmol/L and thiourea-containing Na2HPO4 solution with the concentration of 20 mmol/L to prepare thiourea-doped silver phosphate colloid; dripping NH4VO3 solution into the AgNO3 solution while stirring; washing and drying to obtain AgVO3 particles; reducing the AgVO3 particles by utilizing NaBH4 to obtain silver/metavanadic silver particles; finally adding the silver/metavanadic silver particles into the thiourea-doped silver phosphate colloid, stirring and drying to obtain the metavanadic silver/silver/silver phosphate composite catalyst. The metavanadic silver/silver/silver phosphate composite catalyst has a good visible light absorption effect, and can transfer photo-generated electrons effectively, and avoid the combination with electron holes.

Description

technical field [0001] The invention relates to a preparation method of a silver metavanadate / silver / silver phosphate composite catalyst, which belongs to the technical field of sewage treatment in environmental protection. Background technique [0002] Traditional water treatment methods have problems such as low efficiency, high cost, and secondary pollution, and sewage treatment has not been well resolved. The development and application of nanotechnology is likely to completely solve this problem. TiO was discovered in 1972 2 High oxidation activity, good chemical stability, non-toxic to the human body, low cost, no pollution, wide application range, so it is the most important, but TiO 2 The bandgap width is large (such as anatase TiO 2 The forbidden band width Eg=3.2eV), can only absorb the light in the ultraviolet region (wavelength less than 387nm), and the utilization efficiency of solar energy is low. [0003] Semiconductor photocatalysis is one of the most pro...

Claims

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Application Information

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IPC IPC(8): B01J27/198C02F1/30
CPCY02W10/37
Inventor 马建锋邹静李良银姚超
Owner 无锡智慧兴宜信息技术有限公司
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