Vanadium-carbon modified oxygen-deficient titanium dioxide catalyst as well as preparation method and application thereof

A technology of titanium dioxide and oxygen deficiency, applied in the field of composite photocatalyst and its preparation, to achieve high conversion rate and selectivity, improved efficiency and good stability

Active Publication Date: 2022-07-22
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But pure TiO 2 The bandgap width is wide (3.2eV), and it needs to be excited by ultraviolet light with a wavelength of <380nm to make electrons jump to the conduction band and trigger photocatalytic reactions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Nano-reticular titanium dioxide was prepared by hydrothermal method, 1g granular titanium dioxide (particle size 20-60nm) was dispersed in water by ultrasonic, 2.6g solid NaOH was added to dissolve, and then titanium foil was added at 140 ° C for hydrothermal treatment for 12h. After cooling to room temperature, the titanium dioxide was cooled to room temperature. The foil was taken out, washed with acid for 6h, then dried and calcined at 300°C for 2h. The white solid on the titanium foil was scraped off and collected. Dissolve 425 mg of vanadyl oxalate in 35 mL of water to form a solution of 12.14 mg / mL, disperse 725 mg of the prepared nano-reticulated titanium dioxide in the solution, stir for 30 min, and then hydrothermally heat it at 200 ° C for 12 h, through centrifugal separation, distilled water and anhydrous A solid product was obtained after washing with ethanol and drying. The solid product was calcined at 300 °C for 4 h in a muffle furnace, cooled, and then ...

Embodiment 2

[0028] Nano-reticular titanium dioxide was prepared by hydrothermal method, 1g of granular titanium dioxide (particle size 20-60nm) was dispersed in water by ultrasonic, 2.6g of solid NaOH was added to dissolve, and then titanium foil was added at 140 ° C for hydrothermal for 12h. After cooling to room temperature, the titanium The foil was taken out, washed with acid for 6h, then dried and calcined at 300°C for 2h. The white solid on the titanium foil was scraped off and collected. Dissolve 425 mg of vanadyl sulfate and 0.2 mg of polyethylene glycol (PEG) in 35 mL of water to form a solution of 12.14 mg / mL, and disperse the prepared 750 mg of nano-mesh titanium dioxide in the solution, stir for 30 min, and then hydrothermally heat it at 200 °C After 12 h, a solid product was obtained after centrifugation, washing with distilled water and absolute ethanol and drying. The solid product was calcined at 300 °C for 4 h in a muffle furnace, cooled, and then heated in N 2 Under th...

Embodiment 3

[0030] Nano-reticular titanium dioxide was prepared by hydrothermal method, 1g of granular titanium dioxide (particle size 20-60nm) was dispersed in water by ultrasonic, 2.6g of solid NaOH was added to dissolve, and then titanium foil was added at 140 ° C for hydrothermal for 12h. After cooling to room temperature, the titanium The foil was taken out, washed with acid for 6h, then dried and calcined at 300°C for 2h. The white solid on the titanium foil was scraped off and collected. Dissolve 425mg of vanadyl acetylacetonate and 0.2g of polyvinylpyrrolidone (PVP) in 35mL of water to form a solution of 12.14mg / mL, and disperse the prepared nanometer 750mg of mesh-like titanium dioxide in the solution, stir for 30min, and then in water at 180°C After heating for 12 h, a solid product was obtained after centrifugation, washing with distilled water and absolute ethanol and drying. The solid product was calcined at 300 °C for 4 h in a muffle furnace, cooled, and then heated in N 2...

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Abstract

The invention discloses a vanadium-carbon modified oxygen-deficient titanium dioxide photocatalyst which is simple and convenient to prepare, free of noble metal doping, low in cost and high in photocatalytic activity and a preparation method thereof. The preparation method comprises the following steps: preparing nano reticular titanium dioxide by adopting a hydrothermal method, dissolving a certain amount of a vanadium source and a carbon source in water to form a solution with a certain concentration, dispersing the prepared nano reticular titanium dioxide in the solution, stirring, carrying out hydrothermal treatment at 180-250 DEG C, carrying out centrifugal separation, washing with distilled water and absolute ethyl alcohol, and drying to obtain a solid product. Calcining the solid product in a muffle furnace at the temperature of 300 DEG C, cooling, heating to 350 DEG C at the heating speed of 2 DEG C / min in the N2 atmosphere, and calcining to obtain VOx-Cat-TiO2-Ov. VOx-Cat-TiO2-Ov with different compositions can be prepared by changing the mass ratio of the nano reticular titanium dioxide, the vanadium source and the carbon source, and the band gap width of the compound is adjusted. The catalyst can be used for photocatalytic selective oxidation of benzyl alcohol and derivatives thereof.

Description

technical field [0001] The invention relates to the field of photocatalytic oxidation, in particular to a composite photocatalyst for selective oxidation of benzyl alcohol and benzyl alcohol derivatives, and a preparation method and application thereof. Background technique [0002] With the rapid development of industry, energy consumption is increasing day by day. The oxidation of alcohols to produce aldehydes or ketones is one of the most important reactions in chemical synthesis, in which the oxidation of aromatic alcohols is an important process for the synthesis of fine chemicals and valuable intermediates. For example, benzaldehyde generated by selective oxidation of benzyl alcohol is an industrially important aromatic aldehyde, which can be used for the production of aniline, benzophenone, pesticides and other products. The most basic raw material for plastic additives. However, existing oxidants suffer from problems such as high toxicity, difficult recovery, and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J35/02C07C45/00C07C47/54
CPCB01J23/22C07C45/002B01J35/50B01J35/40B01J35/39C07C47/54Y02P20/584
Inventor 陈丽娟郑小强张明剑欧荣廖诗艺向育君
Owner HUNAN UNIV OF SCI & TECH
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