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Efficient magnetic near infrared composite nanometer catalyst and preparation method thereof

A nano-catalyst and near-infrared light technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as difficult recycling, ineffective utilization, and limited application of photocatalysts , to reduce processing costs, achieve magnetic separation and recycling, and expand the range of photoresponse

Active Publication Date: 2018-07-13
PUTIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, TiO 2 The band gap Eg is large, and it can only absorb ultraviolet light with a wavelength less than 387 nm
This makes the energy utilization rate of sunlight only about 4%, while about 48% of visible light and about 44% of near-infrared light in sunlight energy have not been effectively utilized.
In addition, TiO 2 Disadvantages such as difficulty in recycling and reuse also greatly limit the use of TiO 2 Application of photocatalysts in actual environmental pollution control and solar energy utilization

Method used

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  • Efficient magnetic near infrared composite nanometer catalyst and preparation method thereof
  • Efficient magnetic near infrared composite nanometer catalyst and preparation method thereof
  • Efficient magnetic near infrared composite nanometer catalyst and preparation method thereof

Examples

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preparation example Construction

[0027] A kind of high-efficiency magnetic near-infrared light composite nano-catalyst, described catalyst is Fe 3 o 4 / β-NaYF 4 :Yb 3+ ,Tm 3+ / TiO 2 , the catalyst contains dodecahedral β-NaYF with a side length of 20 to 150 nm and a ridge length of 100 to 350 nm. 4 :Yb 3+ ,Tm 3+ , and spherical nano-Fe 3 o 4 Granular and Spherical Nano TiO 2 particles. The preparation method of this catalyst comprises the following steps:

[0028] (1) Mix Degussa P25, oleic acid, and ethanol with magnetic force and stir evenly, then add aqueous sodium hydroxide solution and stir evenly to obtain a mixed solution;

[0029] (2) Add ferrous ammonium sulfate hexahydrate into the above mixed solution and stir evenly with magnetic force;

[0030] (3) Add LnCl dropwise to the above mixed solution 3 solution, stirred magnetically for 20-40min, then slowly added NH 4 F aqueous solution and stirred for 50-70min to obtain the precursor, finally move the precursor into a sealed reaction ket...

Embodiment 1

[0037] Magnetic Fe 3 o 4 / β-NaYF 4 :Yb 3+ ,Tm 3+ preparation of

[0038] In this embodiment, preferably, 12.5mL of oleic acid and 12.5mL of ethanol were mixed with magnetic force for 30 minutes, and then 4mL of sodium hydroxide aqueous solution (containing 1.00g of sodium hydroxide) was added and stirred for 30 minutes. Then, 0.254 g of ferrous ammonium sulfate hexahydrate was added to the above mixed solution and magnetically stirred for 30 min. Then add YCl dropwise 3 (0.50M) 1.600mL, YbCl 3 (0.50M) 0.388 mL, TmCl 3 (0.01M) 0.600mL, magnetically stirred for 30min, then slowly added 2.0mL of NH 4 F (2.0M) aqueous solution and stirred for 60min, and finally moved the precursor into a 50mL sealed reaction kettle with polytetrafluoroethylene lining, placed in a blast dryer at 200°C for hydrothermal reaction for 8h, and then cooled naturally At room temperature, the product is separated by a magnet and washed with a 1:1 mixed solution of ultrapure water and absolute etha...

Embodiment 2

[0040] Fe 3 o 4 / TiO 2 preparation of

[0041] In this example, preferably, 0.06g Degussa P25, 12.5mL oleic acid, and 12.5mL ethanol were mixed and magnetically stirred for 30 minutes, then 4mL sodium hydroxide aqueous solution (containing 1.00g sodium hydroxide) was added and stirred for 30 minutes. Then add 0.254g of ferrous ammonium sulfate hexahydrate to the above mixed solution and stir it magnetically for 120min, finally move this precursor into a 50mL sealed reaction kettle with polytetrafluoroethylene lining, place it in a blast dryer Hydrothermal reaction at 200°C for 8 hours, then naturally cooled to room temperature, the product was separated by a magnet and washed with a 1:1 mixed solution of ultrapure water and absolute ethanol for 3 to 5 times, and then the precipitate was vacuum-dried at 50°C for 24 hours, after grinding High-efficiency magnetic near-infrared photocomposite nanocatalyst Fe 3 o 4 / TiO 2 , and its SEM photo is shown as figure 2 shown.

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Abstract

The invention belongs to the field of a functional material and particularly discloses an efficient magnetic near infrared composite nanometer catalyst (Fe3O4 / beta-NaYF4:Yb<3+>, Tm<3+> / TiO2) and a preparation method thereof. The efficient magnetic near infrared composite nanometer catalyst (Fe3O4 / beta-NaYF4:Yb<3+>, Tm<3+> / TiO2) is synthesized according to a solvothermal one-step method by dissolving Degussa P25, ferrite, rare-earth chloride and NH4F into an ethanol and oleic acid system. The material has the characteristics of low autofluorescence background, narrow emission peak, stable chemical property and the like, and is hopeful to be widely applied to the fields of near infrared photocatalysis, photodynamic therapy, environmental governance, biomedicine and the like. In addition, anupconversion material is endowed with a magnetic property, magnetic separation and recycling can be realized, the treatment cost is reduced and the economic benefit is improved.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a high-efficiency magnetic near-infrared light composite nanocatalyst with a core-shell structure and a preparation method thereof. The composite material has broad application prospects in the fields of environment and energy. Background technique [0002] With the emergence of environmental pollution and energy crises that plague human society, the application of photocatalytic materials in pollution control, solar energy conversion, and self-cleaning has become an extensive research work by scholars from all over the world. Since Fujishima and others discovered the photocatalytic effect of semiconductor materials in 1972, semiconductor photocatalyst technology has been fully developed, mainly focusing on the common semiconductor photocatalyst TiO 2 , g-C 3 N 4 , ZnO, CdS, CdSe, CdTe and Bi 2 WO 6 And so on. TiO 2 It is a photocatalytic material widely used...

Claims

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Application Information

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IPC IPC(8): B01J27/135B01J37/10B82Y30/00B82Y40/00C09K11/02C09K11/86C02F1/30C02F101/30C02F101/34
CPCC09K11/02C09K11/7773B82Y30/00B82Y40/00C02F1/30B01J27/135B01J37/10C02F2305/10C02F2101/345C02F2101/308B01J35/33B01J35/39
Inventor 陈彰旭李先学傅明连林素津叶晨光朱丹琛
Owner PUTIAN UNIV
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