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Method for degrading methylene blue with hydrogen peroxide under catalysis of graphene/MnO2 nano-composite

A nano-composite, hydrogen peroxide technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage treatment, etc., can solve the problems of slow degradation rate and low catalytic activity, and achieve small MnO2 particles and electrical conductivity. High performance and good stability

Inactive Publication Date: 2014-01-15
LIAONING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of low catalytic activity and slow degradation rate in the prior art, and provides a graphene / MnO with high catalytic activity, fast degradation rate, high degradation rate and reduced cost. 2 Nanocomposite Catalyzed Method for Hydrogen Peroxide Degradation of Methylene Blue

Method used

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  • Method for degrading methylene blue with hydrogen peroxide under catalysis of graphene/MnO2 nano-composite
  • Method for degrading methylene blue with hydrogen peroxide under catalysis of graphene/MnO2 nano-composite
  • Method for degrading methylene blue with hydrogen peroxide under catalysis of graphene/MnO2 nano-composite

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Embodiment 1

[0014] Prepare graphene / MnO according to the method of prior art 2 nanocomposite, the graphene / MnO 2 MnO in nanocomposites 2 content, so that MnO 2 The mass percentage is 91%, which is the target catalyst. Take 50 ml of methylene blue aqueous solution with a concentration of 50 mg / L, add 10 mg of the target catalyst and 10 ml of hydrogen peroxide with a mass concentration of 30%, and carry out catalytic oxidation reaction at 50 °C.

[0015] The ultraviolet-visible (UV-vis) spectrum of catalyzed hydrogen peroxide degradation of methylene blue dye is shown in figure 1 Shown, the curve graph of time and degradation rate in catalytic hydrogen peroxide degradation methylene blue process is as follows figure 2 shown. The results show that after 5 minutes of reaction in Example 1 of the present invention, the degradation rate of methylene blue dye reaches 100%, and the experiment proves that Example 1 is the best reaction condition.

Embodiment 2

[0017] Prepare graphene / MnO according to the method of prior art 2 Nanocomposite, by adjusting the addition of supernatant and corresponding potassium permanganate in the graphite oxide stock solution, the graphene / MnO 2 MnO in nanocomposites 2 content, so that MnO 2 The mass percentage is 77%, which is the target catalyst. Take 50ml of methylene blue aqueous solution with a concentration of 25mg / L, add 10mg of the target catalyst and 10ml of hydrogen peroxide with a mass concentration of 30%, and carry out catalytic oxidation reaction at 25°C.

[0018] The ultraviolet-visible (UV-vis) spectrum of catalyzed hydrogen peroxide degradation of methylene blue dye is shown in image 3 Shown, the curve graph of time and degradation rate in catalytic hydrogen peroxide degradation methylene blue process is as follows Figure 4 shown. The results show that Example 2 of the present invention reacts for 5 minutes, and the degradation rate of methylene blue dye reaches 60%, and reacts...

Embodiment 3

[0020] Prepare graphene / MnO according to the method of prior art 2 Nanocomposite, by adjusting the addition of supernatant and corresponding potassium permanganate in the graphite oxide stock solution, the graphene / MnO 2 MnO in nanocomposites 2 content, so that MnO 2 The mass percentage is 85%, which is the target catalyst. Take 50ml of methylene blue aqueous solution with a concentration of 100mg / L, add 10mg of the target catalyst and 10ml of hydrogen peroxide with a mass concentration of 30%, and carry out catalytic oxidation reaction at 40°C.

[0021] The ultraviolet-visible (UV-vis) spectrum of catalyzed hydrogen peroxide degradation of methylene blue dye is shown in Figure 5 Shown, the curve graph of time and degradation rate in catalytic hydrogen peroxide degradation methylene blue process is as follows Image 6 shown. The results show that Example 3 of the present invention reacts for 5 minutes, and the degradation rate of methylene blue dye reaches 85%, and react...

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Abstract

The invention discloses a method for degrading methylene blue with hydrogen peroxide under the catalysis of a graphene / MnO2 nano-composite. The method has the advantages of high catalytic activity, fast degradation speed, high degradation rate, and energy saving. The method has the steps that: a methylene blue water solution with a concentration of 25-100mg / L is fetched; a graphene / MnO2 composite and hydrogen peroxide are added; and a catalytic oxidation reaction is carried out under a temperature of 25-50 DEG C. In the graphene / MnO2 composite, the mass percentage of MnO2 is 77-91%. A dose ratio of graphene / MnO2 composite to the methylene blue water solution is 0.2g / L. Mass concentration of hydrogen peroxide is 30%. Dose ratio of hydrogen peroxide to the methylene blue water solution is 200ml / L.

Description

technical field [0001] The invention relates to a method for degrading methylene blue, especially a graphene / MnO with high catalytic activity, fast degradation rate, high degradation rate and reduced cost 2 Nanocomposite-catalyzed hydrogen peroxide degradation of methylene blue. Background technique [0002] Dye wastewater is one of the main sources of water pollution, among which methylene blue dye wastewater is a typical representative, which has the disadvantages of high chroma and refractory degradation. The existing main methods for degrading methylene blue dye wastewater include photocatalysis, microbial degradation, physical adsorption, Fenton method and other methods, wherein the Fenton reagent uses Fe 2+ Catalyze hydrogen peroxide to generate free radicals, which promote the decomposition of methylene blue. It has also been reported in the literature that MnO 2 As a catalyst to catalyze the degradation of dyes by hydrogen peroxide, however, MnO 2 Poor conductivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/58
Inventor 曲江英石琳高峰邵光华李玉倩
Owner LIAONING NORMAL UNIVERSITY
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