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Preparation method of Bi2WO6 nano-sheets

A nanosheet and solution technology, which is applied in the field of preparation of Bi2WO6 nanosheets, can solve problems such as TiO2 has not had a major breakthrough, and achieve excellent photocatalytic performance, easy control, and stable product quality.

Inactive Publication Date: 2017-09-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes TiO 2 The practical research process has not made a major breakthrough for a long time

Method used

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  • Preparation method of Bi2WO6 nano-sheets
  • Preparation method of Bi2WO6 nano-sheets
  • Preparation method of Bi2WO6 nano-sheets

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1) Dissolve 1.5mmol sodium tungstate dihydrate in 15ml deionized water, so that the molar concentration of sodium tungstate dihydrate solution is 0.10mol / L;

[0035] 2) 3mmol ammonium bismuth citrate is dissolved in 15ml deionized water, so that the molar concentration of ammonium bismuth citrate solution is 0.20mol / L, and 0.10mmol of PVA is dissolved in 10ml deionized water;

[0036] Add the ammonium bismuth citrate solution dropwise to the sodium tungstate solution at a rate of 1-2 drops / second, and add the PVA solution dropwise to the above mixed solution at the same rate, stir for 30 minutes, and then set the temperature at 180°C Insulated for 12 hours for heat treatment. Then, lower to room temperature, take out the reaction product, filter, wash with dilute acetic acid, deionized water and ethanol three times successively, and dry at 60°C to obtain Bi 2 WO 6 Nanosheets.

Embodiment 2

[0038] 1) Dissolve 3mmol sodium tungstate dihydrate in 15ml deionized water, so that the molar concentration of sodium tungstate dihydrate solution is 0.20mol / L;

[0039] 2) Dissolve 6mmol bismuth ammonium citrate in 15ml deionized water, so that the molar concentration of bismuth ammonium citrate solution is 0.40mol / L; 0.25mmol PVA is dissolved in 10ml deionized water;

[0040] Add the ammonium bismuth citrate solution dropwise to the sodium tungstate solution at a rate of 1-2 drops / second, and add the PVA solution dropwise to the above mixed solution at the same rate, stir for 30 minutes, and then set the temperature at 200°C Insulate for 20 hours for heat treatment. Then, lower to room temperature, take out the reaction product, filter, wash with dilute acetic acid, deionized water and ethanol three times successively, and dry at 60°C to obtain Bi 2 WO 6 Nanosheets.

[0041] The synthesized Bi 2 WO 6 X-ray diffraction patterns of nanosheets, such as figure 1Shown; Sca...

Embodiment 3

[0043] 1) Dissolve 4.5mmol sodium tungstate dihydrate in 15ml deionized water, so that the molar concentration of sodium tungstate dihydrate solution is 0.30mol / L;

[0044] 2) 9mmol of ammonium bismuth citrate is dissolved in 15ml of deionized water, so that the molar concentration of ammonium bismuth citrate solution is 0.60mol / L, and 0.5mmol of PVA is dissolved in 10ml of deionized water;

[0045] Add the ammonium bismuth citrate solution dropwise to the sodium tungstate solution at a rate of 1-2 drops / second, and add the PVA solution dropwise to the above mixed solution at the same rate, stir for 30 minutes, and then set the temperature at 250°C Insulated for 32 hours for heat treatment. Then, lower to room temperature, take out the reaction product, filter, wash with dilute acetic acid, deionized water and ethanol three times successively, and dry at 60°C to obtain Bi 2 WO 6 Nanosheets.

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Abstract

The present invention relates to a preparation method of Bi2WO6 nano-sheets. The preparation method comprises: 1) adding an ammonium bismuth citrate solution into a sodium tungstate solution in a dropwise manner, wherein the molar concentration of ammonium bismuth citrate solution is 0.20-0.60 mol / L, and the molar concentration of the sodium tungstate solution is 0.10-0.30 mol / L; and 2) continuously adding a PVA solution in a dropwise manner, mixing, carrying out a hydrothermal reaction, filtering, and washing to obtain the Bi2WO6 nano-sheets, wherein the molar concentration of the PVA solution is 0.01-0.05 mol / L. According to the present invention, the preparation process is simple, the morphology of the self-assembled structure is easy to control, the size is uniform, and the prepared Bi2WO6 nano-sheets have excellent photocatalytic performance.

Description

technical field [0001] The present invention relates to Bi 2 WO 6 The synthetic field of, specifically relate to a kind of Bi 2 WO 6 Preparation methods of nanosheets. Background technique [0002] At present, a large amount of water environment pollution seriously restricts the sustainable development of our country and affects the health of the people. It is a social problem related to the national economy and people's livelihood that needs to be solved urgently. According to statistics, 70% of water pollution is caused by organic pollution, and the degradation and removal of organic pollutants is the key to water pollution control. Semiconductor photocatalytic degradation is one of the most effective methods to remove organic pollution, with the advantages of low cost, high efficiency and no secondary pollution. [0003] However, due to TiO 2 The photocatalyst has a wide band gap (3.0eV for the rutile phase and 3.2eV for the anatase phase), and it only responds to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00B01J23/31
CPCC01G41/00B01J23/31C01P2004/20C01P2004/03C01P2002/72C01P2004/51C01P2004/64B01J35/39
Inventor 徐刚皇甫统帅孙小磊沈鸽韩高荣
Owner ZHEJIANG UNIV
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