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Preparation method and application of nano alpha-FeOOH/oxidized graphene

A graphene and graphene dispersion technology, applied in the interdisciplinary field, can solve the problems of easy inactivation of natural enzymes, low catalytic activity, and non-recyclability, etc., and achieve simple equipment, cheap and easy-to-obtain raw materials, and simple and reliable preparation process Effect

Inactive Publication Date: 2013-09-11
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural enzymes are easily inactivated, expensive and cannot be reused, limiting the use of these methods
Researches on enzymes such as metalloporphyrin and metal phthalocyanine complexes, Schiff base complexes, heme and heme are increasing, but these imitative enzymes have the disadvantages of difficult synthesis or low catalytic activity

Method used

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  • Preparation method and application of nano alpha-FeOOH/oxidized graphene
  • Preparation method and application of nano alpha-FeOOH/oxidized graphene
  • Preparation method and application of nano alpha-FeOOH/oxidized graphene

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of nano-α-FeOOH / graphene oxide, the steps are as follows:

[0030] (1) Graphite oxide was prepared by the Hummers method. The specific steps were: add 115 mL of 98% concentrated H 2 SO 4 Add 5g of graphite powder (natural flake graphite powder, particle size 4μm) while stirring, and then slowly add 15g of KMnO 4 , plus KMnO 4 During the process, the reaction temperature was controlled to be lower than 20°C. After the addition, the temperature was raised to 35°C and kept constant. After stirring for 2 hours, 230 mL of distilled water was added, and the temperature was raised to 98°C and kept stirring for 15 minutes. Then, 350 mL of distilled water and 13 mL of 30% H were added. 2 o 2 , continue to stir the reaction for 5min. The resulting product was washed and centrifuged several times until the supernatant was washed with BaCl 2 SO not detected 4 2- So far, finally dry in a vacuum oven to obtain graphite oxide;

[0031] (2) Take 0.4g of gra...

Embodiment 2

[0035] Utilize the nano-α-FeOOH / graphene oxide dispersion liquid of the 8.0g / L that embodiment 1 prepares to measure the method for hydrogen peroxide as the catalyst, the step of its working curve making is as follows:

[0036] (1) Add 0.40mL NaAc-HAc buffer solution (pH4.0) with a concentration of 0.1mol / L, 0.80mL with a concentration of 1.875×10 -2 mol / L N,N-diethyl-p-phenylenediamine sulfate solution, 8.0g / L nanometer α-FeOOH / graphene oxide dispersion liquid and 1.80mL double distilled water that 0.50mL embodiment 1 makes, ultrasonic Disperse to obtain a mixed solution. Accurately pipette 0.50mL of hydrogen peroxide solutions of different concentrations into the mixed solution, and place it in a water bath at 40°C for 20 minutes;

[0037] The concentrations of the hydrogen peroxide solutions with different concentrations are 0.8, 1.6, 4.0, 8.0, 16.0, 40.0, 80.0, 160.0, 400.0, 800.0, 1600.0, 2400.0 μmol / L;

[0038] (2) Centrifuge after the reaction, use twice distilled wate...

Embodiment 3

[0041] In order to study the effect of reaction pH value on the absorbance of the system, pH optimization experiments were carried out. Except that the pH values ​​of the buffer solution were 3.5, 4.0, 4.5, 5.0, 5.5, and 6.0, the other reaction conditions and operations were exactly the same as in Example 2. The results showed that the absorbance of the system was the highest when the pH value was 4.0.

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Abstract

The invention belongs to the field of interdisciplines of materials, chemistry, environment and other disciplines and in particular discloses a method for preparing nano alpha-FeOOH / oxidized graphene and application of the nano alpha-FeOOH / oxidized graphene to measurement of trace hydrogen peroxide. The particles of the nano alpha-FeOOH / oxidized graphene synthesized by an in-situ precipitation method have the enzymatic activity similar to that of horseradish peroxidase, and the hydrogen peroxide can be catalyzed to oxidize a substrate, N,N-phenylenediamine sulfate, to generate a colored compound with the highest absorption at 550nm, thereby establishing an ultraviolet and visible spectrophotometer method for rapidly measuring hydrogen peroxide based on alpha-FeOOH / oxidized graphene type enzyme catalysis hydrogen peroxide. The method for synthesizing the nano alpha-FeOOH / oxidized graphene has the advantages of cheap and readily available raw materials and simple and reliable preparation. The measurement method is high in sensitivity, simple, convenient, rapid, simple in equipment, low in detection limit and high in selectivity and has high application value in the fields of environment, food and the like.

Description

technical field [0001] The invention relates to the interdisciplinary field of materials, chemistry, environment and other disciplines, in particular to a preparation method of nano-α-FeOOH / graphene oxide and its application in the determination of trace hydrogen peroxide. Background technique [0002] As an important compound, hydrogen peroxide is widely used as bleaching agent, oxidizing agent, disinfectant, and dechlorination agent. Trace amounts of hydrogen peroxide in the atmosphere can oxidize +4-valent sulfur in the air to +6-valent sulfur, resulting in the formation of acid rain; the hydrogen peroxide content in the air should not exceed 1.4mg / m 3 , Excessive inhalation can cause poisoning. In biological systems, excessive hydrogen peroxide and its product OH often cause lipid peroxidation, protein carbonylation, certain enzymes and DNA strand breaks or the formation of DNA adducts, which are harmful to the human body. Therefore, the determination of trace hydrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33C01B31/04C01B32/198
Inventor 常青江国栋唐和清
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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