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Cobalt tungstate/bismuth/bismuth oxybromide ternary heterojunction composite material and preparation method and application thereof

A technology of bismuth oxybromide ternary and composite materials, which is applied in the field of composite acoustic catalyst preparation, can solve the problems of not meeting actual needs and low separation efficiency, achieve good application prospects, simple preparation process, and improve the effect of acoustic catalytic activity

Pending Publication Date: 2021-10-19
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, CoWO 4 is used as an acoustic catalyst, however CoWO 4 Separation efficiency is very low and cannot meet practical needs in many applications

Method used

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  • Cobalt tungstate/bismuth/bismuth oxybromide ternary heterojunction composite material and preparation method and application thereof
  • Cobalt tungstate/bismuth/bismuth oxybromide ternary heterojunction composite material and preparation method and application thereof
  • Cobalt tungstate/bismuth/bismuth oxybromide ternary heterojunction composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation of embodiment 1 cobalt tungstate

[0025] 1.4551g Co(NO 3 ) 2 ·6H 2 O and 1.6493g Na 2 WO 4 2H 2 O was dissolved in a 100mL Erlenmeyer flask with 30mL of deionized water respectively; the two were mixed, and the mixture was magnetically stirred for 30min; after ultrasonic reaction for 30min, it was poured into a polytetrafluoroethylene reactor, and placed in a blast drying oven for 180 ℃ for 24 hours; after the reaction, filter with suction, dry at 80℃ for 2 hours, grind into a fine powder with an agate mortar, and obtain CoWO 4 powder.

Embodiment 2

[0026] The preparation of embodiment 2 cobalt tungstate / bismuth composite material

[0027] 10.5993g NaPO 2 h 2 .H 2 O was dissolved in 50ml deionized water, and after magnetic stirring for 20min, 0.45027gC was added 4 h 4 o 6 and 0.08g NaOH NaOH, after continuing magnetic stirring for 30min, add 1.5g CoWO 4 Ultrasonic treatment, to obtain A solution to obtain a solution. 1.2127Bi(NO 3 ) 3 ·5H 2 O dissolved in 5ml HNO 3 , solution B was obtained after magnetic stirring. Under the condition of magnetic stirring, add solution B to solution A drop by drop, put it in an oven at 60°C for 6 hours for hydrothermal reaction, filter with suction, wash with deionized water to obtain the sample, and put the sample at 70-90 ℃ drying for 2 hours to obtain cobalt tungstate / bismuth nanoparticles.

Embodiment 3

[0028] Example 3 Preparation of cobalt tungstate / bismuth / bismuth oxybromide ternary heterojunction composite material

[0029] Evenly disperse 0.16245g of potassium bromide into 20ml of ethylene glycol, evenly disperse 0.16245g of bismuth nitrate into 100ml of deionized water to prepare a bismuth nitrate solution, add 0.2g of cobalt tungstate / bismuth nanoparticles into the bismuth nitrate solution, Then the above two solutions were mixed, magnetically stirred for 30 min, and ultrasonicated for 30 min. Suction filter and dry at 70-90°C for 2h. Cobalt tungstate / bismuth / bismuth oxybromide powder (1:2) was obtained.

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Abstract

The invention belongs to the field of preparation of composite acoustic catalysts, and particularly relates to a cobalt tungstate / bismuth / bismuth oxybromide ternary heterojunction composite material and a preparation method and application thereof. The preparation method comprises the steps: dissolving NaPO2H2.H2O in deionized water, stirring, adding C4H6O6 and NaOH, continuously stirring, adding CoWO4, carrying out ultrasonic treatment to obtain a solution, slowly adding a Bi(NO3)3.5H2O solution dissolved in HNO3 into the solution, uniformly stirring, and carrying out hydrothermal reaction, suction filtration, washing and drying to obtain cobalt tungstate / bismuth nanoparticles; and adding the cobalt tungstate / bismuth nanoparticles into a container filled with a bismuth nitrate solution, ethylene glycol and potassium bromide, uniformly mixing, stirring, carrying out ultrasonic suction filtration, and drying to obtain cobalt tungstate / bismuth / bismuth oxybromide powder. The prepared composite material has a smaller forbidden bandwidth, and the transmission distance of electrons and holes is reduced, so that the acoustic catalytic activity of the composite material is improved. And under the ultrasonic condition, a good degradation effect on tetracycline is achieved.

Description

technical field [0001] The invention belongs to the field of composite acoustic catalyst preparation, and in particular relates to a preparation method and application of a cobalt tungstate / bismuth / bismuth oxybromide ternary heterojunction composite material. Background technique [0002] Cobalt tungstate (CoWO 4 ) is a p-type semiconductor with a bandgap energy of about 3.00eV, which is suitable for visible light absorption and sonocatalytic degradation. Therefore, CoWO 4 is used as an acoustic catalyst, however CoWO 4 The separation efficiency is very low and cannot meet practical needs in many applications. Therefore, it is of great practical significance to overcome the above-mentioned defects. [0003] The sonocatalytic activity is closely related to the morphology and charge separation efficiency of sonocatalytic materials. A large number of studies have shown that the synthesis of sonocatalytic composite materials can improve the coupling of semiconductor precurs...

Claims

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Application Information

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IPC IPC(8): B01J23/888B01J27/132B01J35/10C02F1/36C02F101/30C02F101/34C02F101/38
CPCB01J23/888C02F1/36C02F2101/30C02F2101/34C02F2101/38B01J35/23B01J35/612B01J35/613B01J35/633B01J35/647
Inventor 王思幻徐亮刘妮萍吴学签王新
Owner LIAONING UNIVERSITY
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