Bismuth vanadate/bismuth oxide and preparation method

A technology of bismuth vanadate and bismuth oxide, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of difficult large-scale industrial production, high preparation cost, complex preparation technology, etc. The effect of improving the effective contact area, low production cost and simple process method

Inactive Publication Date: 2018-07-06
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to bismuth vanadate / bismuth oxide, BiOCl / BiVO 4 、BiOBr / BiVO 4 Photocatalysts with heterogeneous structures have also been reported many times. The current preparation technology is relatively complicated, the preparation cost is too high, and it is difficult to realize large-scale industrial production.

Method used

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  • Bismuth vanadate/bismuth oxide and preparation method
  • Bismuth vanadate/bismuth oxide and preparation method
  • Bismuth vanadate/bismuth oxide and preparation method

Examples

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Effect test

Embodiment 1

[0020] Add a certain amount of bismuth oxybromide powder into deionized water and ultrasonically disperse, then add sodium hydroxide solution to the above system, wherein the molar ratio of bismuth oxybromide to sodium hydroxide is 1:4, and use ethanol and deionized The ion water was washed repeatedly for 3 times, and bismuth oxide was obtained after drying.

Embodiment 2

[0022] Step 1, add a certain amount of citric acid to 2 mol / L nitric acid, then add a certain amount of Bi(NO 3 ) 3 ·5H 2 O, stirred until uniform, where Bi(NO 3 ) 3 ·5H 2 The molar ratio of O and citric acid is 1:2, and the pH value is adjusted to 7 with ammonia water;

[0023] Step 2, a certain amount of NH 4 VO 3 Dissolve in sodium hydroxide solution, add the solution obtained in step 1 to the above solution, and adjust the pH value to 7 with ammonia water;

[0024] In step 3, the solution obtained in step 2 was first placed in a water bath at 80°C, and then dried at 135°C for 5 hours, and the powder obtained after grinding was calcined at 500°C for 4 hours to obtain bismuth vanadate.

Embodiment 3

[0026] Step 1, add a certain amount of citric acid to 2 mol / L nitric acid, then add a certain amount of Bi(NO 3 ) 3 ·5H 2 O, stirred until uniform, where Bi(NO 3 ) 3 ·5H 2 The molar ratio of O and citric acid is 1:2, and the pH value is adjusted to 7 with ammonia water;

[0027] Step 2, a certain amount of NH 4 VO 3 Dissolve in sodium hydroxide solution, add the solution obtained in step 1 to the above solution, and adjust the pH value to 7 with ammonia water;

[0028] Step 3, the solution obtained in step 2 is first placed in a water bath at 80°C, then dried at 135°C for 5 hours, and the powder obtained after grinding is calcined at 500°C for 4 hours to obtain bismuth vanadate;

[0029] Step 5, mix the bismuth oxybromide powder with the obtained bismuth vanadate, add deionized water and ultrasonically disperse, then add the sodium hydroxide solution to the above system, wherein the molar ratio of bismuth vanadate to bismuth oxybromide is 1:0.30 , the molar ratio of bi...

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Abstract

The invention discloses bismuth vanadate/bismuth oxide and a preparation method. The preparation method comprises the following steps: firstly adding bismuth nitrate in nitric acid, adding ammonium metavanadate in a sodium hydroxide solution, mixing the two solutions, regulating and controlling the pH value and obtaining bismuth vanadate through drying, grinding and calcining. The bismuth vanadate/bismuth oxide and the preparation method disclosed by the invention have the benefits that after in-situ conversion of bismuth oxybromide by using sodium hydroxide, bismuth oxide in the bismuth vanadate/bismuth oxide is obtained; bismuth vanadate/bismuth oxide powder is obtained through mixing and dispersing the obtained bismuth vanadate powder and the bismuth oxide powder, then adding a sodium hydroxide solution, stirring, washing and drying; the bismuth vanadate/bismuth oxide has the advantages of being easy to regulate and control in ratio between two-phase components, low in production cost, simple and convenient in process and the like.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to bismuth vanadate / bismuth oxide and a preparation method. Background technique [0002] As environmental pollution and energy shortage become more and more serious, related issues have attracted more and more attention. Photocatalytic technology has attracted more and more attention because of its advantages of directly using sunlight to solve water pollution. Photocatalyst is the core of this technology. Traditional photocatalytic materials represented by TiO2 have been extensively studied because of their stability, low price, non-toxicity, and good catalytic activity. The application in various fields is limited. Bismuth oxide and bismuth vanadate can catalytically decompose water and degrade organic pollutants under visible light conditions. However, when used alone, there are problems such as low separation efficiency of photogenerated carriers and poor photocatalytic perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J37/03B01J37/08C02F1/30C02F101/34C02F101/36C02F101/38
CPCB01J23/22B01J23/002B01J37/031B01J37/08C02F1/30C02F2101/308C02F2101/34C02F2101/36C02F2101/38C02F2305/10
Inventor 单连伟卢长慧
Owner HARBIN UNIV OF SCI & TECH
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