a bi 2 o 2 co 3 /bi 2 the w 6 :yb 3+ 、er 3+ Photocatalyst and its preparation method and application

A photocatalyst, -er3 technology, applied in the field of preparation of nano photocatalytic materials, can solve the problems of small specific surface area, unfavorable electron transfer and storage, easy recombination of photogenerated electrons and holes, and achieve good application prospects, simple process, good repeatability

Active Publication Date: 2021-06-01
LIAONING UNIVERSITY
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Problems solved by technology

[0003] However, due to the small specific surface area of ​​a single bismuth-based photocatalyst, there are not enough reactive sites, and its own structure is not conducive to the transfer and storage of electrons, and cannot effectively transfer photogenerated carriers, resulting in the easy recombination of photogenerated electrons and holes. thereby reducing the photocatalytic activity of the catalyst

Method used

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  • a bi <sub>2</sub> o <sub>2</sub> co <sub>3</sub> /bi <sub>2</sub> the w <sub>6</sub> :yb <sup>3+</sup> 、er <sup>3+</sup> Photocatalyst and its preparation method and application
  • a bi <sub>2</sub> o <sub>2</sub> co <sub>3</sub> /bi <sub>2</sub> the w <sub>6</sub> :yb <sup>3+</sup> 、er <sup>3+</sup> Photocatalyst and its preparation method and application
  • a bi <sub>2</sub> o <sub>2</sub> co <sub>3</sub> /bi <sub>2</sub> the w <sub>6</sub> :yb <sup>3+</sup> 、er <sup>3+</sup> Photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 Pure Bi 2 o 2 CO 3 preparation of

[0035] One, the preparation method is as follows:

[0036] Weigh 0.485g bismuth nitrate pentahydrate and dissolve it in a mixed solvent formed by 24ml ethylene glycol and 6ml deionized water, stir at room temperature until clarified to obtain a precursor solution; transfer the precursor solution to a 100ml hydrothermal reaction kettle, and The hydrothermal kettle was placed in an oven at 180°C for solvothermal reaction for 12 hours. After the reaction was completed, the oven was closed and the hydrothermal kettle was cooled to room temperature to obtain a precipitate. Take the precipitate in a centrifuge tube, centrifuge and wash three times with deionized water and absolute ethanol, and dry at 80°C for 12 hours to obtain pure Bi 2 o 2 CO 3 sample.

[0037] 2. Test results

[0038] figure 1 The curve in (a) is pure Bi 2 o 2 CO 3 XRD detection of samples. It can be seen from the figure that the pure Bi 2 o ...

Embodiment 2

[0040] Embodiment 2 Pure Bi 2 WO 6 preparation of

[0041] One, the preparation method is as follows:

[0042] Dissolve 2mmol of bismuth nitrate pentahydrate in 10ml (0.4mol / L) of dilute nitric acid to obtain a clear and transparent A solution; dissolve 1mmol of sodium tungstate dihydrate in 20ml of deionized water to obtain a clear and transparent B solution. Add solution A to solution B dropwise, adjust the pH of the mixed solution to 1 with 0.4 mol / L dilute nitric acid, and stir at room temperature for 60 minutes to obtain a white suspension. The reaction system was transferred to a polytetrafluoroethylene stainless steel reaction kettle, solvothermally reacted at 160°C for 20 hours, then cooled naturally, the precipitate was washed with deionized water and absolute ethanol for 3 times and centrifuged, and dried in an oven at 80°C Afterwards, it was calcined in a muffle furnace at 550 °C for 4 h to obtain Bi 2 WO 6 Nano powder.

[0043] 2. Test results

[0044] figu...

Embodiment 3

[0046] Example 3 Bi 2 WO 6 : Yb 3+ 、Er 3+ preparation of

[0047] One, the preparation method is as follows:

[0048] (1) Dissolve 0.3mmol ytterbium oxide and 0.1mmol erbium oxide in 10mL (0.4mol / L) dilute nitric acid, heat and stir, and obtain Yb 3+ -Er 3+ solution.

[0049] (2) Dissolve 2mmol of bismuth nitrate pentahydrate in 10ml of dilute nitric acid to obtain a clear and transparent A solution; dissolve 1mmol of sodium tungstate dihydrate in 20ml of deionized water to obtain a clear and transparent B solution. Add solution A to solution B dropwise, adjust the pH of the mixed solution to 1 with 0.4 mol / L dilute nitric acid, and stir at room temperature for 60 minutes to obtain a white suspension. Take 1ml of Yb 3 + -Er 3+ The solution was added dropwise to 30 mL of white suspension, and the stirring was continued at room temperature. The reaction system was transferred to a polytetrafluoroethylene stainless steel reaction kettle, solvothermally reacted at 160°C...

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Abstract

The invention discloses a two-step solvothermal synthesis of Bi 2 o 2 CO 3 / Bi 2 WO 6 :Yb 3+ 、Er 3+ The method and application of spherical composite photocatalyst belong to the technical field of photocatalytic material preparation. With Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 The mixed solution of O was used as the precursor, and Bi was obtained by hydrothermal method combined with calcination method 2 WO 6 :Yb 3+ 、Er 3+ Powder; Bi 2 WO 6 :Yb 3+ 、Er 3+ Powder added to Bi 2 o 2 CO 3 The precursor solution was mixed evenly, and the obtained suspension was transferred to a polytetrafluoroethylene stainless steel reaction kettle, placed in an oven, solvothermally reacted again, cooled to room temperature naturally, and the resulting precipitate was washed with deionized water and absolute ethanol Rinse separately, centrifuge and dry in a drying oven to obtain Bi 2 o 2 CO 3 / Bi 2 WO 6 : Yb 3+ 、Er 3+ . The synthesis method of the invention is simple, the cost is low, the shape of the synthesized sample is intact, the size is uniform, and the average diameter is about 10 μm, and the composite catalyst is expected to be widely used in the field of photocatalysis.

Description

technical field [0001] The present invention relates to the preparation of a kind of nanometer photocatalytic material, relate in particular to a kind of adopting two-step hydrothermal method to synthesize Bi 2 o 2 CO 3 / Bi 2 WO 6 :Yb 3+ 、Er 3+ The spherical composite photocatalyst and its preparation method and application belong to the technical field of inorganic nanometer material preparation. Background technique [0002] With the development of human society, the problem of environmental pollution has become more and more serious, so the new challenges to solve the problem of environmental pollution are also increasing. Photocatalytic environmental purification technology uses electron-hole pairs formed by photocatalytic reactions and a series of active oxygen species with high redox sites to degrade various organic or inorganic pollutants in the environmental system through redox reactions. even mineralized. At present, a variety of photocatalysts have been re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/232B01J35/08C02F1/30C02F101/38
CPCB01J27/232B01J35/004B01J35/023B01J35/08C02F1/30C02F2101/38C02F2305/10
Inventor 王绩伟郭枳汛韩宇张璐黄峻霆杨涵
Owner LIAONING UNIVERSITY
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