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Preparation method of photocatalyst having near-infrared responsiveness and taking porous silicon dioxide fiber as carrier and photocatalyst

A technology of porous silica and photocatalyst, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve difficult separation, recovery and reuse, Inactivation, not easy to settle and other problems, to achieve the effect of uniform shell thickness, easy operation and uniform diameter

Inactive Publication Date: 2020-02-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such small-sized particles are too small, so they are easy to aggregate and inactivate in practical applications, and are not easy to settle, making them difficult to separate, recycle and reuse

Method used

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  • Preparation method of photocatalyst having near-infrared responsiveness and taking porous silicon dioxide fiber as carrier and photocatalyst
  • Preparation method of photocatalyst having near-infrared responsiveness and taking porous silicon dioxide fiber as carrier and photocatalyst
  • Preparation method of photocatalyst having near-infrared responsiveness and taking porous silicon dioxide fiber as carrier and photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1 mmol of rare earth oxide RE with a chemical molar ratio of (Y:Yb:Tm=79.5:20:0.5) 2 o 3 Dissolve in concentrated hydrochloric acid, heat until the water in the solution evaporates, dissolve in deionized water to obtain a dispersion with a concentration of 0.1mmol / L. Dissolve PVP in deionized water to obtain a dispersion with a concentration of 0.1 mmol / L, add it dropwise to the above solution, and keep stirring for 30 min until a white precipitate is formed. Then, an aqueous solution dispersed with 4 mmol NaF was added dropwise, and stirring was continued for 1 h. Move the reaction precursor solution into a 40ml reaction kettle, raise the temperature to 180°C, and react for 12 hours, then centrifuge, wash, and dry the obtained product to obtain a white powder sample.

[0038] Take 50mg of prepared NaYF 4 : Yb, Tm powder ultrasonically dispersed in 10ml of absolute ethanol. Then, weigh 0.086g of butyl titanate, 0.2g of PVP, 1ml of water, and 10ml of absolute ethanol, ...

Embodiment 2

[0041] 1 mmol of rare earth oxide RE with a chemical molar ratio of (Y:Yb:Tm=79.5:20:0.5) 2 o 3 Dissolve in concentrated hydrochloric acid, heat until the water in the solution evaporates, dissolve in deionized water to obtain a dispersion with a concentration of 0.1mmol / L. Dissolve PVP in deionized water to obtain a dispersion with a concentration of 0.1 mmol / L, add it dropwise to the above solution, and keep stirring for 30 min until a white precipitate is formed. Then, an aqueous solution dispersed with 4 mmol NaF was added dropwise, and stirring was continued for 1 h. Move the reaction precursor solution into a 40ml reaction kettle, raise the temperature to 180°C, and react for 12 hours, then centrifuge, wash, and dry the obtained product to obtain a white powder sample.

[0042] Take 50mg of prepared NaYF 4 : Yb, Tm powder ultrasonically dispersed in 10ml of absolute ethanol. Then, weigh 0.086g of butyl titanate, 0.2g of PVP, 1ml of water, and 10ml of absolute ethanol...

Embodiment 3

[0045] 1 mmol of rare earth oxide RE with a chemical molar ratio of (Y:Yb:Tm=79.5:20:0.5) 2 o 3 Dissolve in concentrated hydrochloric acid, heat until the water in the solution evaporates, dissolve in deionized water to obtain a dispersion with a concentration of 0.1mmol / L. Dissolve PVP in deionized water to obtain a dispersion with a concentration of 0.1 mmol / L, add it dropwise to the above solution, and keep stirring for 30 min until a white precipitate is formed. Then, an aqueous solution dispersed with 4 mmol NaF was added dropwise, and stirring was continued for 1 h. Move the reaction precursor solution into a 40ml reaction kettle, raise the temperature to 180°C, and react for 12 hours, then centrifuge, wash, and dry the obtained product to obtain a white powder sample.

[0046] Take 50mg of prepared NaYF 4 : Yb, Tm powder ultrasonically dispersed in 10ml of absolute ethanol. Then, weigh 0.086g of butyl titanate, 0.2g of PVP, 1ml of water, and 10ml of absolute ethanol...

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Abstract

The invention provides a preparation method of a photocatalyst having the near-infrared responsiveness and taking porous silicon dioxide fibers as a carrier, and belongs to the technical field of nanoscale science. Firstly, a rare earth oxide is used as a raw material and core-shell type nano-catalyst particles with uniform particle size distribution and near-infrared responsiveness are obtained by adopting a hydrothermal method; secondly, the silicon dioxide fibers with porous structures are prepared through combination of a template method with an electrostatic spinning technology; and finally the uniform core-shell type nano-catalyst particles are loaded on the porous silicon dioxide fibers. The core-shell type nano-catalyst particles are uniformly distributed on the surfaces and the inner walls of the prepared porous silicon dioxide fibers, so that good dispersibility and high stability are shown. In addition, the preparation method is low in cost, and the light response range of the photocatalyst can be extended to a near-infrared region.

Description

technical field [0001] The invention relates to the field of inorganic photocatalytic materials, and furthermore, relates to a method for preparing a near-infrared responsive photocatalyst with porous silica fibers as a carrier and a photocatalyst. Background technique [0002] In recent years, various organic pollutants have been increasing, and photocatalytic technology, as a kind of advanced oxidation engineering, has more and more applications in photocatalytic degradation of dyes. However, most materials can only be used under ultraviolet light conditions, which has great limitations in practical applications. Therefore, it is necessary to prepare catalysts with good catalytic effect under sunlight. [0003] Titanium dioxide (TiO 2 ) as an important semiconductor photocatalyst, due to its high catalytic activity, good stability, low price, no secondary pollution, wide band gap and other advantages, it is a semiconductor photocatalyst commonly used in the field of phot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/125B01J35/06B01J37/10B01J37/34B01J37/08C02F1/30
CPCB01J27/125B01J23/002B01J37/0018B01J37/10B01J37/342C02F1/30C02F2305/10B01J35/398B01J35/39B01J35/23B01J35/399B01J35/58
Inventor 温世鹏苏玉仙刘力
Owner BEIJING UNIV OF CHEM TECH
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