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A preparation of β-bi 2 o 3 /bivo 4 Method for Composite Photocatalytic Materials

A technology of composite photocatalysis and composites, which is applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of high organic matter consumption and composite photocatalytic activity It can achieve the effect of simple preparation and operation, less equipment and high photocatalytic activity

Active Publication Date: 2021-06-29
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the invention is to prepare β-Bi 2 o 3 、BiVO 4 In order to solve the problems of high consumption of organic matter and poor photocatalytic activity of the composite, a hydrothermal-calcination method was proposed to prepare β-Bi 2 o 3 / BiVO 4 The method of the composite photocatalytic material improves the activity and stability of the composite photocatalytic material. The preparation process is simple, the cycle is short, and the catalytic activity is high. The β-Bi of the present invention 2 o 3 / BiVO 4 The preparation method of the composite photocatalytic material is as follows:

Method used

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  • A preparation of β-bi <sub>2</sub> o <sub>3</sub> /bivo <sub>4</sub> Method for Composite Photocatalytic Materials
  • A preparation of β-bi <sub>2</sub> o <sub>3</sub> /bivo <sub>4</sub> Method for Composite Photocatalytic Materials
  • A preparation of β-bi <sub>2</sub> o <sub>3</sub> /bivo <sub>4</sub> Method for Composite Photocatalytic Materials

Examples

Experimental program
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Effect test

Embodiment 1

[0018] A preparation of β-Bi 2 o 3 / BiVO 4 The method for composite photocatalytic material, concrete steps are as follows:

[0019] (1) BiVO 4 prepared by hydrothermal method

[0020] Weigh 2.45g of Bi(NO 3 ) 3 ·5H 2 O and 0.58 g NH 4 VO 3 At the same time dissolved in 20.0mL, 4.0mol / L HNO 3In the solution, a yellow transparent solution is formed; the pH value of the solution is adjusted with saturated sodium bicarbonate solution, and the precursor is obtained after magnetic stirring for half an hour; React for 2h, take out and cool to room temperature naturally, filter, filter cake with H 2 O and absolute alcohol were rinsed three times, placed in an oven at 80°C for 12 hours, and after taking it out, it was ground into a powder with a quartz mortar to obtain BiVO 4 .

[0021] (2) β-Bi 2 o 3 / BiVO 4 hydrothermal-roasting preparation

[0022] Weigh an appropriate amount of bismuth nitrate solution and slowly pour it into 20mL, 2.0mol / L HNO 3 solution, ultraso...

Embodiment 2

[0024] A preparation of β-Bi 2 o 3 / BiVO 4 The method for composite photocatalytic material, concrete steps are as follows:

[0025] (1) is the same as (1) in Example 1.

[0026] (2) β-Bi 2 o 3 / BiVO 43 hydrothermal-roasting preparation

[0027] Weigh an appropriate amount of bismuth nitrate solution and slowly pour it into 20mL, 2.0mol / L HNO 3 solution, ultrasonically and mechanically shaken for half an hour until the solution is clear; add the above clear solution to 40mL, 0.6mol / L Na 2 CO 3 , mechanically stirred for 2h, and aged for 1h to obtain β-Bi 2 o 3 Precursor solution; by precursor: BiVO 4 Weigh BiVO at a ratio of 0.5:1 4 Add it into the precursor solution, stir for 30 minutes, filter the mixed solution, dry it, put it in a muffle furnace, and roast it at 380°C for 10 minutes, take it out quickly, and cool it to room temperature naturally, the obtained bright yellow powder is the complex β- Bi 2 o 3 / BiVO 4 .

Embodiment 3

[0029] A preparation of β-Bi 2 o 3 / BiVO 4 The method for composite photocatalytic material, concrete steps are as follows:

[0030] (1) is the same as (1) in Example 1.

[0031] (2) β-Bi 2 o 3 / BiVO 4 hydrothermal-roasting preparation

[0032] Weigh an appropriate amount of bismuth nitrate solution and slowly pour it into 20mL, 2.0mol / L HNO 3 solution, ultrasonically and mechanically shaken for half an hour until the solution is clear; add the above clear solution to 40mL, 0.6mol / L Na 2 CO 3 , mechanically stirred for 2 hours, and aged for 1 hour to obtain β-Bi 2 o 3 Precursor solution; by precursor: BiVO 4 Weigh BiVO at a ratio of 1.5:1 4 Add it into the precursor solution, stir for 30 minutes, filter the mixed solution, dry it, place it in a muffle furnace, roast it at 380°C for 10 minutes, take it out quickly, and cool it to room temperature naturally. The obtained bright yellow powder is the complex β- Bi 2 o 3 / BiVO 4 .

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Abstract

A kind of preparation β-Bi 2 o 3 / BiVO 4 A method for composite photocatalytic materials belongs to the field of inorganic catalytic materials. The present invention first prepared BiVO by hydrothermal method 4 , and then prepared β-Bi by hydrothermal-co-precipitation-roasting method 2 o 3 / BiVO 4 Composite photocatalytic materials. The method of the invention has simple preparation process, less equipment cost and less energy consumption. Prepared β‑Bi 2 o 3 / BiVO 4 The specific surface area is large, the stability is strong, and the photocatalytic activity is high. Under the irradiation of simulated solar xenon lamp, 0.1g of the prepared composite photocatalytic material degrades 50mL of rhodamine B solution with a concentration of 10mg / L, and the degradation rate reaches 98% after 130min of light. The product prepared by the invention can be widely used in the field of photocatalytic degradation of organic pollutants.

Description

technical field [0001] The invention relates to a method for preparing β-Bi 2 o 3 / BiVO 4 The method for compounding photocatalytic materials belongs to the technical field of inorganic catalytic materials. Background technique [0002] Semiconductor photocatalysis technology is a technology to deal with environmental problems, which has played a driving role in wastewater treatment and other pollution control technologies. Traditional photocatalysts (such as TiO 2 and ZnO) have a large band gap and can only be used for ultraviolet light (3.0-3.2eV), which only accounts for 3%-5% of solar energy. The study found that Bi 2 o 3 , BiOBr, BiOI and BiVO 4 Such bismuth-based visible photocatalytic materials have the advantages of low cost, environmental protection, and high efficiency, and have been widely used in the degradation of organic water pollutants and the photolysis of H 2 and CO 2 Restoring. β-Bi 2 o 3 (β-bismuth oxide) is a typical tetragonal semiconductor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J35/10B01J37/10B01J37/08C02F1/30C02F101/34C02F101/36C02F101/38
CPCB01J23/22B01J23/002B01J37/10B01J37/088C02F1/30C02F2101/34C02F2101/36C02F2101/38C02F2305/10B01J35/39B01J35/613
Inventor 徐龙君杨雅寒刘成伦王海龙
Owner CHONGQING UNIV