Magnetic photocatalyst with SPR response, and preparation method thereof

A photocatalyst and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of long photocatalyst preparation time, small nanoparticle size, and shortened crystallization time, etc., to achieve Shortened crystallization time, small particle size, and increased specific surface area

Inactive Publication Date: 2018-03-02
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the technical problems such as long photocatalyst preparation time, low degradation efficiency and difficult recovery in the above-mentioned prior art, the present invention proposes a magnetic photocatalyst Ag / Ag with surface plasmon resonance (SPR) effect 3 PO 4 / Fe 3 o 4 Its preparation method first uses microwave irradiation to quickly and simply prepare nano-Fe with good magnetic properties and uniform particle size. 3 o 4 particles, followed by ultrasonic-assisted in situ precipitation to prepare the magnetic composite catalyst Ag 3 PO 4 / Fe 3 o 4 , and finally use microwave to reduce part of silver to prepare Ag / Ag 3 PO 4 / Fe 3 o 4 Composite materials; the uniform transfer of heat in the microwave oven is conducive to the nucleation of nanoparticles and shortens the crystallization time. The prepared nanoparticles have small particle size, narrow distribution, regular shape, and high catalytic activity; at the same time, Fe 3 o 4 The presence of the catalyst makes the catalyst superparamagnetic, and after the degradation is completed, only an external magnetic field can be used to achieve rapid recycling

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  • Magnetic photocatalyst with SPR response, and preparation method thereof
  • Magnetic photocatalyst with SPR response, and preparation method thereof
  • Magnetic photocatalyst with SPR response, and preparation method thereof

Examples

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Embodiment 1

[0033] This embodiment adopts microwave-assisted synthesis to prepare Ag / Ag 3 PO 4 / Fe 3 o 4 Composite materials, including the following steps:

[0034] (1) Weigh FeCl 3 ·6H 2 O was dissolved in deionized water, and NH with a mass concentration of 28% was added under stirring 3 ·H 2 O to a pH of 9, transferred to a microwave oven and heated for 8 minutes to obtain a black precipitate; after separating the precipitate with a strong magnet, washed several times with deionized water and absolute ethanol, and dried in a vacuum oven at 60°C for 6 hours. get nano Fe 3 o 4 ;

[0035] (2) the nano-Fe that step (1) obtains 3 o 4 Rapid ultrasonic dispersion in deionized water, the AgNO 3 with Na 2 HPO 4 Add to the above-mentioned dispersion liquid successively with a molar ratio of 3:1, and continue to sonicate for 50 minutes until the reaction ends; where Ag 3 PO 4 with Fe 3 o 4 The molar ratio is 1:1; after separating the precipitate in the reaction solution with a ...

Embodiment 2

[0038] This embodiment adopts microwave-assisted synthesis to prepare Ag / Ag 3 PO 4 / Fe 3 o 4 Composite materials, including the following steps:

[0039] (1) Weigh FeCl 3 ·6H 2 O was dissolved in deionized water, and NH with a mass concentration of 28% was added under stirring 3 ·H 2 O to a pH of 9, transferred to a microwave oven and heated for 8 minutes to obtain a black precipitate; after separating the precipitate with a strong magnet, washed several times with deionized water and absolute ethanol, and dried in a vacuum oven at 60°C for 6 hours. get nano Fe 3 o 4 ;

[0040] (2) the nano-Fe that step (1) obtains 3 o 4 Rapid ultrasonic dispersion in deionized water, the AgNO 3 with Na 2 HPO 4 Add to the above-mentioned dispersion liquid successively with a molar ratio of 3:1, and continue to sonicate for 50 minutes until the reaction ends; where Ag 3 PO 4 with Fe 3 o 4 The molar ratio is 2:1; after separating the precipitate in the reaction solution with a ...

Embodiment 3

[0043] This embodiment adopts microwave-assisted synthesis to prepare Ag / Ag 3 PO 4 / Fe 3 o 4 Composite materials, including the following steps:

[0044] (1) Weigh FeCl 3 ·6H 2 O was dissolved in deionized water, and NH with a mass concentration of 28% was added under stirring 3 ·H 2 O to a pH of 9, transferred to a microwave oven and heated for 8 minutes to obtain a black precipitate; after separating the precipitate with a strong magnet, washed several times with deionized water and absolute ethanol, and dried in a vacuum oven at 70°C for 5 hours. get nano Fe 3 o 4 ;

[0045] (2) the nano-Fe that step (1) obtains 3 o 4 Rapid ultrasonic dispersion in deionized water, the AgNO 3 with Na 2 HPO 4 Add to the above-mentioned dispersion liquid successively with a molar ratio of 3:1, and continue to sonicate for 40 minutes until the end of the reaction; where Ag 3 PO 4 with Fe 3 o 4 The molar ratio is 1:2; after separating the precipitate in the reaction solution w...

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Abstract

The invention belongs to the technical field of photocatalysts, and discloses a magnetic photocatalyst with SPR response, and a preparation method thereof. The preparation method comprises: rapidly and simply preparing Fe3O4 nanoparticles with good magnetic property and uniform particle size through microwave irradiation, preparing a magnetic composite catalyst Ag3PO4 / Fe3O4 by using an ultrasonic-assisted in-situ precipitation method, and preparing an Ag / Ag3PO4 / Fe3O4 composite material through microwave reduction of partial silver. According to the present invention, the photocatalyst is rapidly prepared by using the microwave reduction method, wherein the method is simple, and the preparation time is substantially shortened; and the prepared catalyst has high activity so as to further improve the light conversion rate, has superparamagnetism, and can be simply and rapidly recycled, wherein the MG degradation rate of the catalyst can achieve more than 99%.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a magnetic nano photocatalyst. Background technique [0002] Malachite green (MG) is a triphenylmethane dye, which is widely used in printing and dyeing, leather and textile industries. It is also widely used in aquaculture because of its high-efficiency bactericidal effect and low price. Malachite green is highly toxic, highly residual, and has carcinogenic, teratogenic, and mutagenic effects on organisms. Therefore, it is of great significance to choose an efficient, stable and low-cost treatment method to remove malachite green in water. [0003] In 1972, Japanese scientists Honda and Fujishima published in the "Nature" magazine about n-type semiconductor TiO 2 The paper on the photocatalytic total decomposition of water to produce hydrogen and oxygen on a single crystal electrode. This discovery set off an upsurge in photocatalysis research in the scienti...

Claims

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Application Information

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IPC IPC(8): B01J27/185B01J35/02B01J37/34C02F1/30C02F1/72C02F101/30
CPCC02F1/30C02F1/725B01J27/1853B01J37/343B01J37/346C02F2101/308B01J35/33B01J35/40B01J35/39
Inventor 李胜玲刘宪华张蕾董丰
Owner TIANJIN UNIV
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