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Fe3O4-MnO2-CeO2 nano material as well as preparation method and application thereof

A nanomaterial and nanosheet technology is applied in the field of catalytic materials to achieve the effects of low cost, strong catalytic ability and easy preparation

Pending Publication Date: 2022-07-29
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanomaterials are mostly composed of one or two kinds of nanomaterials, such as metal nanoparticles, metal oxide nanoparticles, metal sulfides, carbon-based nanomaterials, etc. Although they have high catalytic activity, only a single enzyme Activity, there are certain limitations in the application in some fields, such as cell protection in biological therapy, the demand for the active properties of nanomaterials is not limited to conventional oxidase-like enzymes, but also requires catalase-like enzymes to work together Avoid damage to cells by toxic substances

Method used

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  • Fe3O4-MnO2-CeO2 nano material as well as preparation method and application thereof
  • Fe3O4-MnO2-CeO2 nano material as well as preparation method and application thereof
  • Fe3O4-MnO2-CeO2 nano material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Fe 3 O 4 @MnO 2 -CeO 2 Synthesis of Nanomaterials

[0032] 1. Fe 3 O 4 Nanoparticles

[0033] 0.65g (4mmol) FeCl 3 and 0.20 g (0.78 mmol) of C 6 H 5 Na 3 O 7 Dissolve in 20mL (CH 2 OH) 2 Then, 1.20 g (14.6 mmol) of NaAc was added and stirred for 20 min; the reaction solution was transferred to a hydrothermal synthesis reactor at 200° C. for 10 h, cooled to room temperature, and repeatedly washed with deionized water-ethanol-deionized water for 3 times. collected and dried at 60 °C overnight to obtain the product Fe 3 O 4 Nanoparticles (Fe 3 O 4 NFs). to Fe 3 O 4 TEM characterization of the morphology as figure 2 , it can be seen that Fe 3 O 4 It is spherical, the surface is relatively smooth, and the particle size is about 160-250nm.

[0034] 2. Synthesis of Fe 3 O 4 @MnO 2

[0035] 0.1 g (0.43 mmol) Fe 3 O 4 The NFs were dispersed in 30 mL of deionized water under the action of ultrasound, and 0.2 g (1.27 mmol) of KMnO was slowly...

Embodiment 2

[0042] Example 2 Fe 3 O 4 @MnO 2 -CeO 2 Oxidase-like activity of nanomaterials

[0043] 1. Fe 3 O 4 @MnO 2 -CeO 2 Analysis of oxidase-like activity of nanomaterials.

[0044] (1) Take 285 μL and 282 μL of 0.2M acetic acid-sodium acetate buffer solution at pH 4.0 into each centrifuge tube in parallel, and add 0 μL and 3 μL of Fe to each centrifuge tube in turn. 3 O 4 @MnO 2 -CeO 2 NFs aqueous solution (1 mg / mL), 3 μL, 3 μL of 3,3',5,5'-tetramethylbenzidine anhydrous ethanol solution (TMB, 10 mM), and the above solutions were mixed evenly;

[0045] (2) the mixed solution prepared in step (1) was reacted at room temperature for 10min;

[0046] (3) Fe is removed by an external magnetic field 3 O 4 @MnO 2 -CeO 2 separated from the reaction liquid;

[0047] (4) Measure the ultraviolet absorption spectrum of the above mixed solution with an ultraviolet-visible absorption spectrophotometer, such as Image 6 A shown.

[0048] The result is as Image 6 As shown in A,...

Embodiment 3

[0055] Example 3 Fe 3 O 4 @MnO 2 -CeO 2 catalase-like activity of

[0056] 1. Fe 3 O 4 @MnO 2 -CeO 2 Analysis of catalase-like activity.

[0057] (1) Take three 285μL and 270μL 50mM, pH 7.0 phosphate buffers in parallel, and add 15μL Fe to each centrifuge tube in turn 3 O 4 @MnO 2 -CeO 2 Aqueous solution (1 mg / mL), then add 15 μL of 100 mM hydrogen peroxide, and mix the above solution evenly;

[0058] (2) the mixed solution prepared in step (1) was reacted at room temperature for 50min;

[0059] (3) Fe is removed by an external magnetic field 3 O 4 @MnO 2 -CeO 2 separated from the reaction liquid;

[0060] (4) measure the absorbance value at 240nM of above-mentioned mixed solution with ultraviolet-visible absorption spectrophotometer, the result is as follows Figure 7 A shown.

[0061] As shown in 7A, Fe 3 O 4 @MnO 2 -CeO 2 It can decompose hydrogen peroxide and has the ability to degrade hydrogen peroxide, so the nanomaterials synthesized in this exper...

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Abstract

The invention relates to the field of catalyst materials, and discloses a preparation method and application of a Fe3O4-MnO2-CeO2 nano material. The Fe3O4-MnO2-CeO2 nano material has multiple enzyme-like activities, has the activities of peroxidase-like, superoxide dismutase-like and phenolic oxide enzyme-like besides the conventional oxidase-like activity, and can be used for preparing an oxide-like enzyme catalyst, a peroxidase-like catalyst, a superoxide dismutase-like catalyst or a phenolic oxide enzyme catalyst. The material has the characteristics of easy preparation, high stability, low cost and strong catalytic ability, and can be used in the fields of chemical catalysis, biological treatment, chemical detection, environmental protection and the like.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, in particular to a kind of Fe 3 O 4 @MnO 2 -CeO 2 Preparation method and application of nanomaterials. Background technique [0002] As an effective green catalyst, natural enzymes are widely used in food, chemical, biological and other fields. Natural enzymes are composed of proteins or RNAs, which have low content in living organisms, are difficult to obtain in large quantities, are expensive, and have harsh application conditions and poor stability in practical applications. These limitations stimulate various simulated enzymes (also known as "artificial enzymes"). ”) generation and development. The production of nanomaterials is inspired by natural enzymes, but they are superior to natural enzymes. In addition to the high efficiency of natural enzymes, they generally have the advantages of low cost, easy preparation, good stability, adjustable and mass production. And mature...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J35/02C01B3/04C01B13/02
CPCB01J23/002B01J23/8892C01B3/042C01B13/0207B01J2523/00B01J35/396B01J35/40B01J2523/3712B01J2523/72B01J2523/842
Inventor 鲁娜李雪梅张敏
Owner SHANGHAI UNIV OF ENG SCI
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