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Oxygen vacancy-enriched bismuth molybdate photocatalytic material as well as preparation method and application thereof

A photocatalytic material, bismuth molybdate technology, applied in the field of photocatalysis, can solve the problems of limited optimization and achieve the effect of increasing content, improving separation efficiency and high degradation efficiency

Active Publication Date: 2022-07-05
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent introduces oxygen vacancies on the surface of the photocatalytic material by roasting to improve its catalytic performance. Compared with the control of its surface morphology, its optimization of the catalytic performance of bismuth molybdate is limited.

Method used

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  • Oxygen vacancy-enriched bismuth molybdate photocatalytic material as well as preparation method and application thereof
  • Oxygen vacancy-enriched bismuth molybdate photocatalytic material as well as preparation method and application thereof
  • Oxygen vacancy-enriched bismuth molybdate photocatalytic material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) 0.5 mmol Bi(NO 3 ) 3 · 5H 2 O was dissolved in 60 ml of deionized water, 1.5 mmol of sodium dodecylbenzenesulfonate was added under constant stirring for 1 h, and then 0.5 mmol of NH was added. 4 VO 3 Dissolved in 60ml of water and stirred for 30min; finally, the above solution was mixed and stirred for 30min to form a stable precursor solution A;

[0031] (2) 6 mmol of Bi(NO 3 ) 3 · 5H 2 O was dissolved in 60 ml of 1 mol / L nitric acid to form solution I, and 3 mmol of Na 2 MoO 4 ·2H 2 O is dissolved in 60ml, 1mol / L of sodium hydroxide to form solution II; 6mmol of citric acid is added to solution I; then solution I mixed with citric acid is mixed with solution II to form stable precursor solution B;

[0032] (3) Adjust the pH of solutions A and B to 7, respectively, and let stand for 2 hours; then mix solutions A and B and transfer them to a hydrothermal reactor, and react at 160 °C for 24 hours;

[0033] (4) After the reaction kettle was cooled, the solu...

Embodiment 2

[0035] (1) 0.5 mmol Bi(NO 3 ) 3 · 5H 2 O was dissolved in 60 ml of deionized water, 1.5 mmol of sodium dodecylbenzenesulfonate was added under constant stirring for 1 h, and then 0.5 mmol of NH was added. 4 VO 3 Dissolved in 60ml of water and stirred for 30min; finally, the above solution was mixed and stirred for 30min to form a stable precursor solution A;

[0036] (2) 6 mmol of Bi(NO 3) 3 · 5H 2 O was dissolved in 65 ml of 1 mol / L nitric acid to form solution I, and 3 mmol of Na 2 MoO 4 ·2H 2 O is dissolved in 65ml, 1mol / L of sodium hydroxide to form solution II; 6.5mmol of citric acid is added to solution I; then solution I mixed with citric acid is mixed with solution II to form stable precursor solution B;

[0037] (3) Adjust the pH of the solutions A and B to 7 respectively, and let them stand for 1.5 hours; then mix the solutions A and B and transfer them to the hydrothermal reactor, and react at 160°C for 24 hours;

[0038] (4) After the reaction kettle was ...

Embodiment 3

[0040] (1) 0.5 mmol Bi(NO 3 ) 3 · 5H 2 O was dissolved in 60 ml of deionized water, 1.5 mmol of sodium dodecylbenzenesulfonate was added under constant stirring for 1 h, and then 0.5 mmol of NH was added. 4 VO 3 Dissolved in 60ml of water and stirred for 30min; finally, the above solution was mixed and stirred for 30min to form a stable precursor solution A;

[0041] (2) 6 mmol of Bi(NO 3 ) 3 · 5H 2 O was dissolved in 55 ml of 1 mol / L nitric acid to form solution I, and 3 mmol of Na 2 MoO 4 ·2H 2 O is dissolved in 55ml, 1mol / L of sodium hydroxide to form solution II; 5.5mmol of citric acid is added to solution I; then solution I mixed with citric acid is mixed with solution II to form stable precursor solution B;

[0042] (3) Adjust the pH of solutions A and B to 7, respectively, and let stand for 2.5 hours; then mix solutions A and B and transfer them to a hydrothermal reactor, and react at 160 °C for 24 hours;

[0043] (4) After the reaction kettle was cooled, the ...

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Abstract

The invention discloses an oxygen vacancy-enriched bismuth molybdate photocatalytic material, which relates to the technical field of photocatalysis, has a chemical formula of Bi4MoO9, and is prepared by the following steps: (1) dissolving bismuth nitrate in a proper amount of deionized water, and adding a dispersing agent while stirring to react for 1 hour; dissolving soluble vanadium salt in a proper amount of water, and stirring for 30 minutes; mixing and stirring the solutions to form a precursor solution A; (2) respectively dissolving bismuth nitrate and Na2MoO4. 2H2O in a proper amount of nitric acid and sodium hydroxide, and then adding citric acid into the bismuth nitrate solution; mixing the solutions to form a precursor solution B; (3) respectively adjusting the pH values of the solution A and the solution B to 7, standing, mixing, and transferring to a hydrothermal reaction kettle for reaction; and (4) cooling the reaction kettle, drying powder obtained by suction filtration, and roasting at high temperature to obtain a sample. The prepared photocatalytic material is very high in oxygen vacancy activity, simple in reaction condition and convenient to control, and has a very strong degradation effect on rhodamine 6B.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to an oxygen vacancy-rich bismuth molybdate photocatalytic material and a preparation method and application thereof. Background technique [0002] In the periodic table of elements, bismuth element is located in the VA group of the sixth period, and has relatively stable chemical properties. It is different from general metal oxides. The energy band structure of bismuth-based semiconductor compounds is unique. Its valence band (VB) is determined by Bi 6s and O2p orbitals are hybridized, which increases the position of the valence band and reduces the forbidden band width, thereby expanding the response of the material to visible light; at the same time, this unique electronic structure makes the valence band energy levels more dispersed, which can promote The separation of photogenerated electrons and holes, so bismuth-based compounds are a new class of high-efficiency semic...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01J37/10C01G39/02C02F1/30C02F1/72C02F101/38C02F101/36C02F101/34
CPCB01J23/28B01J23/002B01J37/10C01G39/02C02F1/30C02F1/725C02F2101/38C02F2101/36C02F2101/34C02F2101/308C02F2305/10C02F2305/023C01P2002/01C01P2002/72C01P2004/02C01P2002/85B01J35/39Y02E60/36Y02W10/37
Inventor 杨俊陈俊羽赵颖郑安娜张瑜师慧婷谢太平何家洪
Owner CHONGQING UNIV OF ARTS & SCI
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