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Preparation method of SnO2/Fe3O4 composite nano catalyst

A nano-catalyst, hydrated iron oxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of large difference in crystal structure and achieve good magnetic properties High performance, easy operation and low cost

Pending Publication Date: 2022-03-11
合肥中镓纳米技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The reason is mainly because the crystal structure of the two is quite different (SnO 2 Often an orthorhombic structure, Fe 3 o 4 Cubic structure), therefore, it is difficult for ordinary preparation methods to combine the two together to form composite materials

Method used

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  • Preparation method of SnO2/Fe3O4 composite nano catalyst
  • Preparation method of SnO2/Fe3O4 composite nano catalyst
  • Preparation method of SnO2/Fe3O4 composite nano catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: SnO 2 / Fe 3 o 4 Composite nanocatalyst preparation

[0025] Add 0.5g of α-FeOOH powder to 50mL of SnCl with a concentration of 0.2mol / L 2 In aqueous solution (hydrated iron oxide (FeOOH) powder and stannous chloride (SnCl 2 ) The weight ratio between is 1:3.79), after ultrasonic dispersion for 5min, add 0.2g NaOH solid, and after it is completely dissolved, the precursor FeOOH-Sn 2+ -NaOH-H 2 O, the pH value of the system is 8.

[0026] The precursor FeOOH-Sn 2+ -NaOH-H 2 O was transferred into the reaction kettle, and the hydrothermal reaction was carried out in an oven at 180°C for 24 hours. After the reaction, the product was taken out for washing and drying.

[0027] First, the phase analysis of the product was carried out by means of X-ray diffraction and compared with the bulk SnO 2 Standard XRD diffraction (PDF, No.040783) and Fe 3 o 4 After comparison with the standard XRD diffraction (PDF, No.040783), it is known that the product obtained ...

Embodiment 2

[0030] Embodiment 2: the impact of FeOOH dosage on product form, composition and performance

[0031] The preparation method is the same as in Example 1, the addition amount of α-FeOOH powder is adjusted to 0.1g, 0.3g, and 0.7g respectively, and the morphology of the product is observed by SEM. It can be seen that with the gradual increase in the amount of FeOOH powder used in the reaction system increasing, the morphology of the product gradually changed from random nanoparticles to rod-like particles ( figure 2 a~c).

[0032]The phase analysis of the product by means of X-ray diffraction shows that too little or too much FeOOH powder will make the final composite material phase impure. It can be seen that when other experimental conditions are the same, the amount of FeOOH powder used has a great influence on the morphology and structure of the final product ( figure 2 d). When the amount of α-FeOOH powder added is between 0.3-0.5 g, the prepared product has higher puri...

Embodiment 3

[0033] Embodiment 3: the impact of NaOH dosage on product morphology and magnetic properties

[0034] The preparation method is the same as in Example 1, and the addition amount of NaOH is adjusted to be 0.1g, 0.4g, and 0.6g respectively.

[0035] In the reaction system, the amount of NaOH used has a great influence on the formation of the phase and the particle size of the product, thus affecting the performance of the final product. from image 3 As a result, it can be seen that as the amount of NaOH used increases gradually, the particle size of the product increases gradually ( image 3 a~c), the macroscopic magnetism of the product is also gradually enhanced ( image 3 d).

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Abstract

A preparation method of a SnO2 / Fe3O4 composite nano-catalyst relates to the technical field of composite nano-catalysts, and comprises two processes of precursor room temperature preparation and hydrothermal reaction, firstly, at room temperature, ferric oxide hydrate (FeOOH) powder is added into a stannous chloride (SnCl2) aqueous solution, after ultrasonic dispersion, a proper amount of NaOH is added, and after stirring and mixing, a reaction precursor is obtained; and then, transferring the precursor into a reaction kettle, and carrying out hydrothermal reaction to obtain the SnO2 / Fe3O4 composite nano catalyst. According to the preparation method, stannous chloride (SnCl2) is taken as a reducing agent, common ferric oxide hydrate (FeOOH) is taken as an iron source, the SnO2 / Fe3O4 nano composite material is successfully prepared through a hydrothermal reaction, and the composite material has good magnetic performance and visible light absorption characteristics and is expected to be used in the fields of magnetic optical device manufacturing or sewage treatment catalysts and the like.

Description

technical field [0001] The invention relates to the technical field of composite nano catalysts, in particular to a SnO 2 / Fe 3 o 4 Preparation method of composite nano catalyst. Background technique [0002] Tin oxide (SnO 2 ) is an N-type wide bandgap (E g =3.6eV) oxide semiconductors, with unique optical, electrical and sensing properties, can be widely used in solar cells, transparent electrodes and gas sensors and other fields. Usually the preparation of SnO 2 The method is based on Sn 4+ As a raw material, it is realized by precipitation method. [0003] It is well known that ferric oxide (Fe 3 o 4 ) is a common environmentally friendly magnetic material, which is widely used in the fields of magnetic fluid, microwave absorption, catalyst support, advanced catalytic oxidation, biomedicine, and bioseparation. And the preparation of Fe 3 o 4 Available Fe 3+ and Fe 2+ As the raw material, the co-precipitation method is adopted; Fe can also be 3+ It is carri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/835B01J35/02C02F1/30C02F1/72C02F101/38
CPCB01J23/835B01J23/002C02F1/30C02F1/725C02F1/72C02F2305/10C02F2305/026C02F2101/38B01J35/50B01J35/40B01J35/33B01J35/39Y02W10/37
Inventor 吴斌胡园园沈寿国杨盛王劲松
Owner 合肥中镓纳米技术有限公司
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