Scandium doping zinc oxide-bismuth vanadium oxide composite photodegradation material and preparation method thereof

A technology for degrading materials, bismuth vanadate, is applied in the field of photodegradable materials, which can solve the problems of easy compounding, increasing the size of ZnO grains, and short absorption of visible light waves, so as to improve the degradation efficiency, shorten the diffusion time, and increase the absorption. Band effect

Inactive Publication Date: 2019-11-08
厦门珉瑶贸易有限公司
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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a scandium-doped zinc oxide-bismuth vanadate composite photodegradable material and its preparation method, which solves the problem that the existing zinc oxide material absorbs the visible light wave because the section is relatively short, resulting in photogenerated electronic e - and hole h + It is easy to compound, which...

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  • Scandium doping zinc oxide-bismuth vanadium oxide composite photodegradation material and preparation method thereof
  • Scandium doping zinc oxide-bismuth vanadium oxide composite photodegradation material and preparation method thereof
  • Scandium doping zinc oxide-bismuth vanadium oxide composite photodegradation material and preparation method thereof

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[0023] In order to achieve the above object, the present invention provides the following technical solutions: a scandium-doped zinc oxide-bismuth vanadate composite photodegradable material and its preparation method, comprising the following raw materials in parts by weight: 42-58 parts of zinc hydroxide, 4-8 parts of citric acid, 0.5-1 part of scandium nitrate hexahydrate, 15-20 parts of bismuth trichloride, 22-27 parts of sodium vanadate, 0.5-2 parts of sodium hydroxide, Zn(OH) in zinc hydroxide 2 The content is 92.5-95.8%, the mass fraction of citric acid is 94.8-96.3%, and Sc(NO 3 ) 3 ·6H 2 O content is 95.5-97.2%, BiCl in bismuth trichloride 3 The content is 93.6-96.7%, Na in sodium vanadate 3 VO 4 The content is 92.4-94.8%, the NaOH content in sodium hydroxide is 95.2-98.4%, a scandium-doped zinc oxide-bismuth vanadate composite photodegradable material, and the preparation method includes the following steps:

[0024](1) Preparation of Mn-doped ZnO: Add 600mL dis...

Embodiment 1

[0028] (1) Preparation of Mn-doped ZnO: Add 600mL of distilled water to a 1000mL beaker, then weigh 58 parts of zinc hydroxide, 0.5 parts of scandium nitrate hexahydrate and 4 parts of citric acid into the beaker and stir them evenly, then put the beaker Put it in an ultrasonic processor with an ultrasonic frequency of 25KHz and an ultrasonic power of 1500W. Ultrasonic disperse for 2-3 hours to form a sol. Then place the beaker in an oven to heat up to 70-75°C and heat for 15-18 hours until the material is anhydrous. Gel-like, then heat up to 120-125°C, heat for 30-35h for dehydration and puffing, to obtain a brown solid mixture Mn-doped ZnO precursor, and then put the precursor into a high-energy planetary ball mill for 6-8h, the speed is 100-120rpm, then put the ground material in a tube-type resistance furnace at a heating rate of 5°C / min, heat to 650-660°C for 3-4h, and obtain an off-white solid. Use 500-700mL with a concentration of 11.5-12.5 % dilute hydrochloric acid to...

Embodiment 2

[0032] (1) Preparation of Mn-doped ZnO: Add 600mL of distilled water to a 1000mL beaker, then weigh 54 parts of zinc hydroxide, 0.6 parts of scandium nitrate hexahydrate and 5 parts of citric acid into the beaker and stir evenly, then put the beaker Put it in an ultrasonic processor with an ultrasonic frequency of 25KHz and an ultrasonic power of 1500W. Ultrasonic disperse for 2-3 hours to form a sol. Then place the beaker in an oven to heat up to 70-75°C and heat for 15-18 hours until the material is anhydrous. Gel-like, then heat up to 120-125°C, heat for 30-35h for dehydration and puffing, to obtain a brown solid mixture Mn-doped ZnO precursor, and then put the precursor into a high-energy planetary ball mill for 6-8h, the speed is 100-120rpm, then put the ground material in a tube-type resistance furnace at a heating rate of 5°C / min, heat to 650-660°C for 3-4h, and obtain an off-white solid. Use 500-700mL with a concentration of 11.5-12.5 % dilute hydrochloric acid to remo...

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Abstract

The invention relates to the technical field of photodegradation materials, and discloses a scandium doping zinc oxide-bismuth vanadium oxide composite photodegradation material and a preparation method thereof. A formula includes the following experiment raw materials: zinc hydroxide, citric acid, scandium nitrate hexahydrate, bismuth trichloride, sodium vanadate, sodium hydroxide, and the like.In the scandium doping zinc oxide-bismuth vanadium oxide composite photodegradation material and the preparation method thereof, ZnO is doped with a rare earth element Sc to form Zn0.92-0.97Sc0.03-0.08O, the Sc makes the size of a ZnO crystal reduce, the specific surface area of the ZnO is increased, the diffusion time of photoelectron e<->-hole h+ is shortened during a photocatalysis process, thereby improving the degradation efficiency of a photocatalyst to organic dye, active oxygen is generated by the action of the ZnO and water and oxygen under illumination, the recombination velocity ofBiVO4 photocatalyst electron-hole is reduced, the number of photoelectron e<-> is increased, the organic dye can capture electron e<->, its activation energy is reduced, and the catalytic efficiency and the degradation efficiency of photocatalytic materials to organic dye pollutants are improved.

Description

technical field [0001] The invention relates to the technical field of photodegradable materials, in particular to a scandium-doped zinc oxide-bismuth vanadate composite photodegradable material and a preparation method thereof. Background technique [0002] There are many kinds of organic dyes, which bring colorful colors to people's life and generate huge economic benefits, but also produce a large amount of dye wastewater discharged into the environmental water body, resulting in the pollution of natural water bodies. The main hazards are: Dyes can absorb light, reduce the transparency of water, consume a large amount of oxygen in water, cause hypoxia in water, affect the growth of aquatic organisms and microorganisms, and destroy the self-purification of water. Among them, organic dyes such as eosin Y and eosin Y disodium salt It is easily soluble in water, and its biological toxicity is relatively high, causing serious pollution and damage to water sources and the envir...

Claims

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Application Information

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IPC IPC(8): B01J23/22C02F1/30C02F1/72C02F101/30
CPCB01J23/002B01J23/22B01J35/004B01J2523/00C02F1/30C02F1/727C02F2101/308C02F2305/10B01J2523/35B01J2523/54B01J2523/55
Inventor 马海龙郭臣唐阔海
Owner 厦门珉瑶贸易有限公司
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