Bismuth tungstate-carbon nitride-silver phosphate ternary efficient visible-light catalyst and preparation method therefor

A technology of bismuth tungstate and carbon nitride, which is used in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of unsatisfactory quantum efficiency visible light response range, etc., and achieves easy operation and preparation method. simple effect

Inactive Publication Date: 2019-06-07
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its quantum efficiency and visible light response range are not ideal enough

Method used

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  • Bismuth tungstate-carbon nitride-silver phosphate ternary efficient visible-light catalyst and preparation method therefor
  • Bismuth tungstate-carbon nitride-silver phosphate ternary efficient visible-light catalyst and preparation method therefor
  • Bismuth tungstate-carbon nitride-silver phosphate ternary efficient visible-light catalyst and preparation method therefor

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Experimental program
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Embodiment 1

[0030] Weigh 0.05 g of cetyltrimethylammonium bromide and dissolve it in 80 ml of deionized water at room temperature, add 0.33 g of sodium tungstate dihydrate, stir magnetically for 30 minutes to dissolve, then add 0.97 g of bismuth nitrate pentahydrate and 0.07 g of carbon nitride to form a white suspension. After continuing to stir for 30 minutes, pour the suspension into a 100 ml polytetrafluoroethylene-lined hydrothermal kettle, put it in an oven, and keep it warm at 120°C for 24 hours. A light yellow precipitate was obtained, which was centrifuged and washed three times with absolute ethanol and deionized water respectively to obtain a bismuth tungstate-carbon nitride complex. Dissolve 0.85 g of polyvinylpyrrolidone into 200 ml of 80% ethanol aqueous solution, add the prepared bismuth tungstate-carbon nitride complex, and ultrasonically disperse for 15 minutes, add 100 ml of 0.005mol / L silver nitrate aqueous solution, stir After 30 minutes, add 100 ml of 0.004mol / L sodiu...

Embodiment 2

[0034] Catalytic Performance Evaluation of Bismuth Tungstate-Carbon Nitride-Silver Phosphate Ternary Visible Light Catalyst Prepared by the Method of the Invention

[0035] The bismuth tungstate-carbon nitride-silver phosphate visible light catalyst prepared by the method of the present invention degrades the dye rhodamine B under visible light, the dosage of the catalyst is 0.05 g, the concentration of rhodamine B is 0.01 g / liter, and the volume is 50 Milliliter, light source adopts 500W halogen tungsten lamp, use filter to ensure that incident light is visible light (420nm≤λ≤800nm), measure the absorbance change of rhodamine B in the degradation process with UV-3600 type ultraviolet-visible spectrophotometer, every 3 Take a sample of 5 ml every minute, and after high-speed centrifugation, take the supernatant for measurement. Figure 5 The curve of the bismuth tungstate-carbon nitride-silver phosphate photocatalyst prepared for the method of the present invention catalytical...

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Abstract

The invention provides a bismuth tungstate-carbon nitride-silver phosphate ternary efficient visible-light catalyst and a preparation method therefor. The ternary efficient visible-light catalyst andthe preparation method therefor are used for solving the difficult problem that photocatalytic performance of bismuth tungstate is not excellent enough. The ternary composite photocatalyst is preparedfrom bismuth tungstate nanosheets, carbon nitride nanosheets and nano silver phosphate which are stacked, wherein the bismuth tungstate nanosheets have the length of 0.8 to 1 micron and the width of0.4 to 0.6 micron, the carbon nitride nanosheets have the length of 0.6 to 0.8 micron and the width of 0.2 to 0.4 micron, and silver phosphate particles have the size of 50 to 100 nanometers. According to the ternary efficient visible-light catalyst and the preparation method therefor, a hydrothermal-precipitation method is applied to preparation of the bismuth tungstate-carbon nitride-silver phosphate ternary composite photocatalyst, and a powdery bismuth tungstate-carbon nitride-silver phosphate complex with excellent visible-light catalysis performance is obtained through firstly synthesizing a bismuth tungstate-carbon nitride complex by adopting a hydrothermal method, compounding silver phosphate into bismuth tungstate-carbon nitride by applying a precipitation method, carrying out filtering so as to obtain precipitates, and carrying out washing and drying. The preparation method provided by the invention is simple, is easy in operation and is beneficial to extensive use of productive practice.

Description

technical field [0001] The invention relates to the technical field of visible light catalytic materials and preparation methods thereof, in particular to a bismuth tungstate-carbon nitride-silver phosphate ternary high-efficiency visible light catalyst and a preparation method thereof. Background technique [0002] With the continuous development of human society, the problem of environmental pollution is becoming more and more serious, and people pay more and more attention to the technical research that can effectively control industrial and domestic pollution. Photocatalytic technology has the advantages of simple process, low cost, and no secondary pollution. It is an emerging technology with great application potential to solve environmental pollution problems. Currently the most widely used is TiO 2 Semiconductor catalyst, but because it only responds to ultraviolet light and has low quantum efficiency, it is difficult to meet the requirements of environmental purifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/18C02F1/30C02F101/34C02F101/36C02F101/38
Inventor 何金云王燕舞龙飞王源沁余奇
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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