Preparation method and application of tungsten sulfide quantum dot and noble metal nanoparticle co-modified bismuth oxybromide composite material

A nanoparticle and composite material technology, applied in the field of preparation of bismuth oxybromide composite materials, can solve the problems of low quantum conversion efficiency, low utilization rate of sunlight, etc., achieve degradable harmful pollutants, enhance utilization rate of sunlight and photons Efficient, easy to achieve results

Pending Publication Date: 2022-01-14
INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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Problems solved by technology

[0005] In order to solve the shortcomings of low sunlight utilization rate and low quantum conversion efficiency of traditional catalysts, the pres

Method used

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  • Preparation method and application of tungsten sulfide quantum dot and noble metal nanoparticle co-modified bismuth oxybromide composite material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] The preparation steps of BiOBr samples are as follows:

[0030] Weighing 0.004mol Bi (NO 3 ) 3 ·5H 2 O (1.94g), added to a beaker containing 40mL of ethylene glycol and stirred for 30 minutes, then the molar ratio was: Bi(NO 3 ) 3 ·5H 2 O:KBr=1:1, add 0.004mol KBr (0.476g) and continue stirring for 30 minutes, the obtained reaction solution is transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, and kept at 140° C. for 24 hours. The obtained product was washed with absolute ethanol and deionized water, and the final product was dried in an oven at 80 °C for 12 hours to obtain a BiOBr sample. The degradation efficiency of the product in this example under visible light for 30 minutes to the dye Rhodamine B (RhB) was 63.5%, the degradation efficiency of RhB for 60 minutes was 76.4%, and the degradation efficiency of RhB for 90 minutes was 83.2%.

[0031] WS 2 The preparation steps of quantum dot samples are as follows:

[0032] Take...

Example Embodiment

[0033] Example 1

[0034] Weigh 2g BiOBr sample, add 250mL deionized water to ultrasonic for 1 hour, add 0.032g AgNO according to 1wt% Ag / BiOBr 3 Stir at 35°C for 3h under oil bath condition, then warm up to 95°C, add 0.022g NaBH 4 Cool to room temperature after half an hour. The resulting product was isolated, washed and dried to obtain a BiOBr catalyst supported by precious metal Ag nanoparticles (labeled as 1% Ag / BiOBr). The degradation efficiency of RhB under visible light for 90 minutes by the product of this example is 94.2%, which is 1.13 times that of pure BiOBr.

Example Embodiment

[0035] Example 2

[0036] Weigh 2g BiOBr sample, add 250mL deionized water for 1 hour, add 0.04g chloroauric acid according to 1wt% Au / BiOBr, stir at 35°C for 3h under oil bath conditions, then heat up to 95°C, add 0.012g NaBH 4 Cool to room temperature after half an hour. The resulting product was isolated, washed and dried to obtain a BiOBr catalyst supported by precious metal Au nanoparticles (labeled as 1% Au / BiOBr). The degradation efficiency of RhB by the product of this example under visible light for 90 minutes is 88.2%, which is 1.06 times that of pure BiOBr.

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Abstract

The invention relates to a preparation method and application of a tungsten sulfide quantum dot and noble metal nanoparticle co-modified bismuth oxybromide composite material, and belongs to the technical field of photocatalysts. The preparation method comprises the following steps: preparing bismuth oxybromide with the uniform size from bismuth nitrate and potassium bromide through a solvothermal method; adding bismuth oxybromide into a noble metal salt solution, and reducing to obtain noble metal loaded bismuth oxybromide; pretreating tungsten sulfide to obtain a tungsten sulfide quantum dot solution; and adding the noble metal-loaded bismuth oxybromide into the tungsten sulfide quantum dot solution, and stirring at room temperature to obtain the tungsten sulfide quantum dot and noble metal nanoparticle co-modified bismuth oxybromide composite material. The tungsten sulfide quantum dot and noble metal nanoparticle co-modified bismuth oxybromide composite photocatalyst prepared by the invention has good performance in the aspect of photodegradation of organic pollutants, can be widely applied to the fields of removal of organic pollutants in catalytic wastewater, reduction of heavy metal ions and the like, and greatly widens the application range of bismuth oxybromide and tungsten sulfide.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and relates to a preparation method and application of a bismuth oxybromide composite material co-modified by tungsten sulfide quantum dots and noble metal nanoparticles. Background technique [0002] Bismuth oxyhalide (BiOX) photocatalyst, as a typical bismuth-based semiconductor material, has a good transfer rate of photogenerated carriers and photogenerated electrons due to its indirect transition mode and unique open layered structure. -The separation efficiency of hole pairs, and thus has a better photocatalytic activity, showing potential application prospects in air purification and organic wastewater treatment, and has become the research focus of scholars at home and abroad. Among the bismuth oxyhalides, bismuth oxybromide (BiOBr) has a band gap of 2.6eV, has the ability to absorb visible light in sunlight, and has attracted much attention due to its high stability. [0003] Usin...

Claims

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Application Information

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IPC IPC(8): B01J27/132C02F1/30C02F1/70C02F101/30C02F101/20
CPCB01J27/132B01J35/004C02F1/30C02F1/70C02F1/705C02F2305/10C02F2101/30C02F2101/20
Inventor 胡银陈伟章芬王玲玲
Owner INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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