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Cerium-doped/cerium-nitrogen co-doped bismuth tungstate photocatalytic material and preparation method thereof

A photocatalytic material, bismuth tungstate technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Catalytic performance and other issues, to enhance the photocatalytic degradation of pollutants and hydrogen production capacity, improve photo-generated electron reduction capacity, and enhance the effect of adsorption

Pending Publication Date: 2021-06-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The valence band is formed by the hybridization of O2p and Bi6s orbitals. From the perspective of chemical potential, the valence of its conduction band is too positive, which leads to the limitation of the reduction ability of photogenerated electrons, thus affecting its photocatalytic performance.

Method used

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  • Cerium-doped/cerium-nitrogen co-doped bismuth tungstate photocatalytic material and preparation method thereof
  • Cerium-doped/cerium-nitrogen co-doped bismuth tungstate photocatalytic material and preparation method thereof
  • Cerium-doped/cerium-nitrogen co-doped bismuth tungstate photocatalytic material and preparation method thereof

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preparation example Construction

[0036] A kind of preparation method of cerium-doped bismuth tungstate photocatalyst material of the present invention comprises the following steps:

[0037] Step 1: Take out a certain amount of Bi(NO 3 ) 3 ·5H 2 O, Na 2 WO 4 2H 2 O and Ce(NO 3 ) 3 ·6H2 O, they are analytically pure (AR) with a purity greater than 99.7% and a low impurity content, and a cerium-doped Bi 2 WO 6 : Ce 3+ The precursor raw material of the material, grinding helps to fully dissolve in the solvent;

[0038] Step 2: The ground Bi(NO 3 ) 3 ·5H 2 O was added to deionized water. In order to strictly control the filling ratio of the subsequent reaction, 70ml of deionized water was used as the aqueous solution system, magnetically stirred at room temperature, and Na was added after stirring evenly. 2 WO 4 2H 2 O mixed and stirred until completely dissolved, Ce(NO 3 ) 3 ·6H 2 O was added to the above mixed solution, mixed and stirred until completely dissolved, at this time Ce(NO 3)3 ·6H ...

Embodiment 1

[0058] A preparation method of cerium-doped bismuth tungstate photocatalytic material, comprising the following steps:

[0059] (1) Weigh 2.037g of Bi(NO 3 ) 3· 5H 2 O, 0.658g of Na 2 WO 4· 2H 2 O and 0.0466g of Ce(NO 3 ) 3· 6H 2 O, obtain the precursor raw material after grinding respectively;

[0060] (2) Grind 2.037g of Bi(NO 3 ) 3 ·5H 2 O was added to 70ml of deionized water, stirred magnetically at room temperature, and after stirring evenly, 0.658g of Na 2 WO 4 2H 2 O was added to the above solution, mixed and stirred until completely dissolved, and 0.0466g of Ce(NO 3 ) 3· 6H 2 O, at this time Ce(NO 3 ) 3· 6H 2 O accounts for Bi(NO 3 ) 3· 5H 2 O and Na 2 WO 4· 2H 2 5% of the total moles;

[0061] (3) The cetyltrimethylammonium bromide of 0.6g is weighed and added in the above mixed solution;

[0062] (4) adjust the pH value of the precursor solution to be 7;

[0063] (5) Perform hydrothermal reaction on the reaction precursor solution with adj...

Embodiment 2

[0066] A preparation method of cerium-doped bismuth tungstate photocatalytic material, comprising the following steps:

[0067] (1) Weigh 2.037g of Bi(NO 3 ) 3· 5H 2 O, 0.658g of Na 2 WO 4· 2H 2 O and 0.0933g of Ce(NO 3 ) 3· 6H 2 O, obtain the precursor raw material after grinding respectively;

[0068] (2) Grind 2.037g of Bi(NO 3 ) 3 ·5H 2 O was added to 70ml of deionized water, stirred magnetically at room temperature, and after stirring evenly, 0.658g of Na 2 WO 4 2H 2 O was added to the above solution, mixed and stirred until completely dissolved, and 0.0933g of Ce(NO 3 ) 3· 6H 2 O, at this time Ce(NO 3 ) 3· 6H 2 O accounts for Bi(NO 3 ) 3· 5H 2 O and Na 2 WO 4· 2H 2 10% of the total moles;

[0069] (3) The cetyltrimethylammonium bromide of 0.6g is weighed and added in the above mixed solution;

[0070] (4) adjust the pH value of the precursor solution to be 7;

[0071] (5) Perform hydrothermal reaction on the reaction precursor solution with ad...

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Abstract

The invention provides a cerium-doped / cerium-nitrogen co-doped bismuth tungstate photocatalytic material and a preparation method thereof. The preparation method comprises the following steps: dissolving Bi(NO3)3. 5H2O, Na2WO4. 2H2O and Ce(NO3)3. 6H2O in deionized water and conducting uniform mixing, or dissolving Bi(NO3)3. 5H2O, Na2WO4. 2H2O, Ce(NO3)3. 6H2O and CH4N2O in deionized water, conducting uniform mixing, adding hexadecyl trimethyl ammonium bromide, conducting uniform mixing, and respectively adjusting the pH values of the obtained solutions to obtain precursor solutions; and finally, cooling the precursor solutions after heat preservation, then separating out products, and sequentially carrying out washing and drying to obtain the cerium-doped / bismuth tungstate photocatalytic material and the cerium-nitrogen co-doped bismuth tungstate photocatalytic material. According to the invention, the pollutant degradation and hydrogen production performance of bismuth tungstate can be further enhanced.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material preparation, in particular to a cerium-doped, cerium-nitrogen co-doped bismuth tungstate photocatalytic material and a preparation method. Background technique [0002] In recent years, environmental problems caused by environmental pollution have occurred frequently, and the deteriorating environmental problems have seriously affected the living environment and health of human beings. It is imminent to solve various deteriorating environmental problems. The focus of environmental governance is to effectively suppress the damage of various chemical pollutions to the water, soil and atmosphere that human beings rely on for survival. Photocatalytic technology has low energy consumption, low cost, deep reaction at low temperature, and no secondary pollution. It can directly use sunlight to convert solar energy into chemical energy to achieve the purpose of degrading pollutants, thus b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/31C01B3/04C02F1/30C02F101/38
CPCB01J27/24B01J23/31C01B3/042C02F1/30C01B2203/0277C02F2101/38C02F2305/10B01J35/39Y02E60/36
Inventor 刘丁菡黄剑锋曹丽云冯亮亮唐军苏杭
Owner SHAANXI UNIV OF SCI & TECH