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Method for synthesizing nitrogen-doped bismuth vanadate photocatalyst and application thereof

A photocatalyst, bismuth vanadate technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of photocatalytic efficiency to be improved, and achieve fast reaction speed, great universality, Simple to use effects

Active Publication Date: 2019-02-12
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photocatalytic properties of these three crystal forms are not the same. Bismuth vanadate has the best photocatalytic performance among the three crystal forms because of its smallest band gap (2.4eV). The photocatalytic efficiency needs to be improved due to the high recombination rate of hole pairs

Method used

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  • Method for synthesizing nitrogen-doped bismuth vanadate photocatalyst and application thereof
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Embodiment 1

[0025] Embodiment 1: a kind of method of nitrogen-doped bismuth vanadate photocatalyst, comprises the following steps:

[0026] Step 1: Dissolve 2.5mmol bismuth nitrate pentahydrate in 2mol / L concentrated nitric acid, add a certain amount of polyvinylpyrrolidone, and stir magnetically for 30 minutes to obtain solution A; dissolve 2.5mmol ammonium metavanadate in 2mol / L ammonia solution , add urea according to the molar ratio of N to Bi of 0.5:1, and stir magnetically for 30 minutes to obtain solution B;

[0027] Step 2: Slowly add solution A to solution B, and continue magnetic stirring for 1 h after mixing. Add concentrated ammonia water dropwise to adjust the pH of the solution to about 7, sonicate for 30 minutes, and then perform magnetic stirring for 1 hour to obtain the precursor solution;

[0028] Step 3: Add the precursor solution into the reaction kettle lined with polytetrafluoroethylene, put the reaction kettle into the oven for heating, set the heating temperature ...

Embodiment 2

[0031] Embodiment 2: a kind of method of nitrogen-doped bismuth vanadate photocatalyst, comprises the following steps:

[0032] Step 1: Dissolve 2.5mmol bismuth nitrate pentahydrate in 2mol / L concentrated nitric acid, add a certain amount of polyvinylpyrrolidone, and stir magnetically for 30 minutes to obtain solution A; dissolve 2.5mmol ammonium metavanadate in 2mol / L ammonia solution , urea was added according to the molar ratio of N and Bi being 1:1, and magnetically stirred for 30 minutes to obtain solution B;

[0033] Step 2: Slowly add solution A to solution B, and continue magnetic stirring for 1 h after mixing. Add concentrated ammonia water dropwise to adjust the pH of the solution to about 7, sonicate for 30 minutes, and then perform magnetic stirring for 1 hour to obtain the precursor solution;

[0034] Step 3: Add the precursor solution into the reaction kettle lined with polytetrafluoroethylene, put the reaction kettle into the oven for heating, set the heating t...

Embodiment 3

[0037] Embodiment 3: a kind of method of nitrogen-doped bismuth vanadate photocatalyst, comprises the following steps:

[0038]Step 1: Dissolve 2.5mmol bismuth nitrate pentahydrate in 2mol / L concentrated nitric acid, add a certain amount of polyvinylpyrrolidone, and stir magnetically for 30 minutes to obtain solution A; dissolve 2.5mmol ammonium metavanadate in 2mol / L ammonia solution In, urea was added according to the molar ratio of N and Bi being 2:1, and magnetically stirred for 30 minutes to obtain solution B;

[0039] Step 2: Slowly add solution A to solution B, and continue magnetic stirring for 1 h after mixing. Add concentrated ammonia water dropwise to adjust the pH of the solution to about 7, sonicate for 30 minutes, and then perform magnetic stirring for 1 hour to obtain the precursor solution;

[0040] Step 3: Add the precursor solution into the reaction kettle lined with polytetrafluoroethylene, put the reaction kettle into the oven for heating, set the heating ...

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Abstract

The invention discloses a preparation method and application for synthesizing a nitrogen-doped bismuth vanadate photocatalyst through a hydrothermal method. The method comprises the steps: dissolvingbismuth vanadate pentahydrate and polyvinylpyrrolidone into concentrated nitric acid to be prepared into a bismuth salt solution, dissolving ammonium metavanadate into an ammonium hydroxide solution to form a vanadium salt solution, adding urea into the vanadium salt solution according to the molar ratio of N to Bi is equal to (1 to 1.5) to 1 to form a mixed solution, then adding the bismuth saltsolution into the mixed solution and adjusting a pH to be 7 to obtain a precursor solution, then transferring the precursor solution into a high-pressure kettle to perform hydrothermal reaction and centrifuging, washing and drying a product to obtain the nitrogen-doped bismuth vanadate photocatalyst after reaction finishes.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, and in particular relates to a nitrogen-doped bismuth vanadate photocatalyst synthesized by a hydrothermal method, a preparation method and application thereof. Background technique [0002] In recent years, the increasingly serious environmental pollution has seriously threatened the survival and development of human beings. With the rapid growth of energy demand, the development and research of new energy and new technology is imminent. Solar energy is a clean and natural renewable energy. The development and utilization of solar energy will neither pollute nor affect the ecological balance; photocatalytic technology is a green technology and has important application prospects. [0003] With the development of photocatalytic technology, many new visible light-responsive semiconductor materials have been developed. Among them, new vanadate photocatalysts, such as bismuth vana...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/38C02F101/36C02F101/34
CPCB01J27/24C02F1/30C02F2101/34C02F2101/36C02F2101/38C02F2305/10
Inventor 仲蕾罗润孙建华牟志刚李梦婷
Owner JIANGSU UNIV OF TECH
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