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ZnFe2O4/Bi7O9I3 magnetic composite photocatalytic material and preparation method thereof

A composite photocatalysis, bi7o9i3 technology, applied in chemical instruments and methods, physical/chemical process catalysts, water/sludge/sewage treatment, etc., can solve problems such as high price, increased energy consumption and cost

Active Publication Date: 2020-10-27
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process of this photocatalyst requires unavoidable high-temperature calcination, and the price of titanium salt is higher than that of zinc salt, which will increase energy consumption and cost in industrial production applications

Method used

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  • ZnFe2O4/Bi7O9I3 magnetic composite photocatalytic material and preparation method thereof
  • ZnFe2O4/Bi7O9I3 magnetic composite photocatalytic material and preparation method thereof
  • ZnFe2O4/Bi7O9I3 magnetic composite photocatalytic material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a ZnFe 2 o 4 / Bi 7 o 9 I 3 The magnetic composite photocatalytic material is prepared according to the following steps:

[0034] S1, ZnFe 2 o 4 Preparation of:

[0035] (1) ZnCl 2 and FeCl 3 ·6H 2 O was dissolved in deionized water at a molar ratio of 1:4, and stirred until completely dissolved to obtain solution A;

[0036] (2) A certain amount of NaAc (with ZnCl 2 The molar ratio is 1:8) into the above-mentioned solution A, stirred at room temperature until completely dissolved to obtain solution B;

[0037] (3) Transfer the solution B into a three-neck flask and incubate at 80° C. for 8 hours to obtain the product solution C;

[0038] (4) After the solution C was left to stand for 2 hours, the product solution C was centrifuged, and the rotation speed was controlled at 7000-9000r / min for 5-9 minutes to separate the product solution C and obtain a precipitate D, which was washed and dried. Said precipitation D, said precipitation ...

Embodiment 2

[0049] To the ZnFe prepared in embodiment 1 2 o 4 / Bi 7 o 9 I 3 Structural characterization of magnetic composite photocatalytic materials.

[0050] Depend on figure 1 Known: ZnFe 2 o 4 with Bi 7 o 9 I 3 The characteristic peaks all exist, indicating that ZnFe 2 o 4 / Bi 7 o 9 I 3 Successfully compounded to form a magnetic composite photocatalytic material;

[0051] Depend on figure 2 Known: ZnFe 2 o 4 It is a spherical nanoparticle with a size of 20-80nm; Bi 7 o 9 I 3 The nanosheets (thickness 5-10nm) are inserted into a micron-scale flower shape, and ZnFe after compounding 2 o 4 Spherical nanoparticles interspersed with Bi 7 o 9 I 3 In the micron-scale flower-like structure composed of nanosheets, a composite structure is formed.

Embodiment 3

[0052] The test of embodiment 3-saturation magnetization

[0053] Utilize vibration magnetometer to measure the ZnFe that embodiment 1 prepares 2 o 4 / Bi 7 o 9 I 3 Magnetic properties of magnetic composite photocatalytic materials.

[0054] Depend on image 3 Know, ZnFe 2 o 4 / Bi 7 o 9 I 3 The magnetic composite photocatalytic material exhibits superparamagnetism, the saturation magnetization is 23.1emu / g, and has good magnetic properties.

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Abstract

The invention belongs to the field of magnetic composite photocatalytic materials, and in particular relates to a ZnFe2O4 / Bi7O9I3 magnetic composite photocatalytic material and a preparation method thereof. The preparation method comprises the following steps of: firstly, inserting ZnFe2O4 magnetic nanoparticles into a micron-sized flower-like structure formed by Bi7O9I3 nanosheets to form a composite structure in which particles are inserted into micron flowers; wherein the size of the ZnFe2O4 nanoparticles is 20-80nm, the thickness of the Bi7O9I3 nanosheet forming the Bi7O9I3 micron flowersis 5-10nm; ZnFe2O4 and Bi7O9I3 are compounded according to a mass ratio of 1:(2-6), the formed magnetic composite photocatalytic material shows superparamagnetism, is high in saturation magnetizationintensity, strong in photocatalytic activity and strong in magnetic separability, has good visible light degradation capability on a target pollutant bisphenol A, and can be quickly recycled through an external magnetic field to achieve the purpose of recycling for multiple times; and the preparation method of the magnetic composite photocatalytic material is reliable in principle, simple, easy tocontrol, green, safe, free of high-temperature calcination, conventional in equipment and low in cost, and has the industrial prospect of large-scale production.

Description

technical field [0001] The invention belongs to the field of magnetic composite photocatalytic materials, in particular to a magnetic composite photocatalytic material and a preparation method thereof. The molecular formula of the magnetic composite photocatalytic material is ZnFe 2 o 4 / Bi 7 o 9 I 3 , has the characteristics of strong photocatalytic activity, high magnetism and recyclability. Background technique [0002] As we all know, for semiconductor photocatalyst materials, under visible light, the electrons in the full valence band cross the forbidden band and enter the empty conduction band under the irradiation of visible light greater than or equal to its band gap energy, and a positive charge will be generated at the position of the corresponding transition electron. photogenerated hole hydrogen ions. The photogenerated electron-hole pairs will form a strong redox system in the water solution, which will oxidize and reduce impurities such as organic substanc...

Claims

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Application Information

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IPC IPC(8): B01J27/138B01J35/10B01J35/02C02F1/30C02F101/34
CPCB01J27/138C02F1/30C02F2101/345C02F2305/10B01J35/33B01J35/40B01J35/39B01J35/61Y02W10/37
Inventor 赵梅李成栋刘孟辰谢美霞何俊贤李逸博杜成功
Owner QINGDAO UNIV OF SCI & TECH
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