Preparation method of visible-light-driven photocatalyst Fe3O4@PDA@Ag composite microsphere

A composite microsphere and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of particle size increase, influence on magnetic properties, and magnetic reduction and other problems, to achieve the effect of convenient coating, cost saving and avoiding secondary pollution

Active Publication Date: 2017-12-08
ZHEJIANG SCI-TECH UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the ferroferric oxide material has a high surface energy, and it is often easy to agglomerate to increase the size of the particles, which affects its own magnetic properties.
At the same time, due to the influence of the surface effect, it is easy to oxidize in the air, resulting in a decrease in its magnetic properties. Therefore, exploring a photocatalyst with high efficiency, visible light response, and recyclability is the focus of research in the field of photocatalysis.

Method used

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  • Preparation method of visible-light-driven photocatalyst Fe3O4@PDA@Ag composite microsphere

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Embodiment 1

[0037] A visible light catalyst Fe 3 o 4The preparation method of @PDA@Ag composite microspheres is characterized in that it comprises the following steps:

[0038] Step 1, dissolving ferric chloride hexahydrate and sodium acetate into equal amounts of ethylene glycol respectively, then mixing and stirring the two solutions evenly, adding 10-30wt% polyacrylic acid solution and continuing to stir for 6-12 hours to form a mixed solution a, and place the mixed solution a in a reaction kettle, keep the reaction at 180-210°C for 4-12 hours, and obtain the black product ferric oxide;

[0039] Step 2, dispersing iron ferric oxide into the ethanol solution of polyvinylpyrrolidone, then adding the aqueous solution of dopamine hydrochloride, water bath, and fully ultrasonically dispersing to form a mixed solution b;

[0040] Step 3, add ammonia water dropwise to the above mixed solution b, continue the ultrasonic reaction for 2-5 hours, and then magnetically separate and wash several ...

Embodiment 2

[0050] A visible light catalyst Fe 3 o 4 The preparation method of @PDA@Ag composite microspheres is characterized in that it comprises the following steps:

[0051] Step 1, dissolving ferric chloride hexahydrate and sodium acetate into equal amounts of ethylene glycol according to the molar ratio of 1:500, the molar ratio of sodium acetate to ethylene glycol is 1:200, and the two solutions Mix and stir evenly, add 10-30wt% polyacrylic acid solution and continue to stir for 8h, wherein the volume ratio of the total amount of ethylene glycol to 10-30wt% polyacrylic acid solution is 40:1, inject the mixed solution into the reactor at 203°C and keep the reaction Obtain black product ferric oxide in 12 hours;

[0052] Step 2, get ferric oxide and disperse it in the ethanol solution of polyvinylpyrrolidone, the mass ratio of ferric ferric oxide and polyvinylpyrrolidone is 1:1, the molar ratio of polyvinylpyrrolidone and ethanol is 1:100, then add hydrochloric acid The aqueous so...

Embodiment 3

[0058] A visible light catalyst Fe 3 o 4 The preparation method of @PDA@Ag composite microspheres is characterized in that it comprises the following steps:

[0059] Step 1, dissolving ferric chloride hexahydrate and sodium acetate into equal amounts of ethylene glycol according to the molar ratio of 1:350, the molar ratio of sodium acetate to ethylene glycol is 1:200, and then the two solutions Mix and stir evenly, add 10-30wt% polyacrylic acid solution and continue to stir for 8h, wherein the volume ratio of total ethylene glycol to 10-30wt% polyacrylic acid solution is 40:1, inject the mixed solution into the reactor at 203°C and keep the reaction for 8 hours Hour obtains black product ferric oxide;

[0060] Step 2, get ferric oxide and disperse it in the ethanol solution of polyvinylpyrrolidone, the mass ratio of ferric ferric oxide and polyvinylpyrrolidone is 1:1, the molar ratio of polyvinylpyrrolidone and ethanol is 1:80, then add hydrochloric acid The aqueous soluti...

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Abstract

The invention belongs to the technical field of photocatalysts and specifically relates to a preparation method of a visible-light-driven photocatalyst Fe3O4@PDA@Ag composite microsphere. The preparation method comprises step 1 of respectively dissolving ferric chloride hexahydrate and sodium acetate into equivalent ethylene glycol, then evenly mixing and stirring two solutions, adding a 10 to 30wt% polyacrylic acid solution to continue stirring for 6 to 12h, putting into a reaction kettle, heating to 180 to 210 DEG C and keeping reaction for 4 to 12h to obtain a black product of ferroferric oxide; step 2 of dispersing the ferroferric oxide into an ethanol solution of polyvinyl pyrrolidone, then adding a water solution of dopamine hydrochloride, performing water bath and fully and ultrasonically dispersing to obtain a mixed solution b; step 3 of dropwise adding ammonium hydroxide into the mixed solution b, continuing ultrasonic reaction for 2 to 5 hours to obtain Fe3O4@PDA composite microspheres; step 4 of adding the prepared Fe3O4@PDA composite microspheres into ammonium hydroxide and silver nitrate to be prepared into a tollens' reagent, putting in a table concentrator to be vibrated for 8 to 16hours, performing magnetic separation and performing aftertreatment to obtain the Fe3O4@PDA@Ag composite microspheres. The Fe3O4@PDA@Ag composite microspheres have an obvious effect on degrading methyl orange and can be used repeatedly.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, in particular to a visible light catalyst Fe 3 o 4 Preparation method of @PDA@Ag composite microspheres. Background technique [0002] In recent years, with the rapid development of science and technology and industrial technology, people's living standards have been greatly improved. However, problems such as environmental pollution and resource shortage brought about by the rapid development of economy and industry are becoming more and more serious. Photocatalytic technology is an effective means of controlling environmental pollution that has developed rapidly in recent years. The International Union of Pure and Applied Chemistry defines photocatalysis as follows: under the action of ultraviolet, visible or infrared light, the photocatalyst absorbs light and participates in the chemical change of the reactant to cause the chemical reaction rate or cause the change of the chemical re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28B01J35/08C02F1/30C02F101/38
CPCB01J31/06B01J31/28B01J35/0033B01J35/004B01J35/006B01J35/008B01J35/08C02F1/30C02F2101/40C02F2305/10Y02W10/37
Inventor 程琳郑海旺李小云吴小平金立汪洋
Owner ZHEJIANG SCI-TECH UNIV
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