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Nano zinc ferrite-graphene composite photocatalyst of visible light response and preparation method thereof

A composite technology of nano-zinc ferrite and graphene, applied in chemical instruments and methods, catalysts for physical/chemical processes, nanotechnology for materials and surface science, etc. and other problems, to achieve the effect of improving adsorption performance and improving photocatalytic activity

Active Publication Date: 2011-07-20
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The energy band gap of zinc ferrite is relatively narrow, only 1.9eV, and both zinc and iron are environmentally friendly nutrients, and it is considered to be an ideal visible light catalyst. Agglomeration is easy to occur during the process, thus reducing its surface area and reducing its adsorption performance, and the photogenerated electrons and holes cannot be effectively separated, which limits its photocatalytic activity.

Method used

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  • Nano zinc ferrite-graphene composite photocatalyst of visible light response and preparation method thereof
  • Nano zinc ferrite-graphene composite photocatalyst of visible light response and preparation method thereof
  • Nano zinc ferrite-graphene composite photocatalyst of visible light response and preparation method thereof

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preparation example Construction

[0019] The preparation method of the nanometer zinc ferrite-graphene composite photocatalyst of visible light response of the present invention comprises the following steps:

[0020] The first step is to ultrasonically disperse graphite oxide in ethanol;

[0021] In the second step, stirring and dissolving ferric nitrate and zinc nitrate in ethanol, the molar ratio of ferric nitrate and zinc nitrate is 2:1, and the stirring time is 30-60 minutes;

[0022] In the third step, the system obtained in the first step is mixed with the mixture obtained in the second step, and stirred for 30-60 minutes;

[0023] In the fourth step, the reaction system of the third step is transferred to a hydrothermal kettle for hydrothermal reaction, the reaction temperature is 160-200°C, and the reaction time is 12-24 hours;

[0024] In the fifth step, the product of the fourth step is centrifuged, washed with deionized water, and dried to obtain a nano-zinc ferrite-graphene composite photocatalys...

Embodiment 1

[0026] Implementation example 1: The preparation method of the nanometer zinc ferrite-graphene composite photocatalyst of visible light response of the present invention, comprises the following steps:

[0027] The first step is the preparation of graphite oxide. Add 10 g of graphite powder to potassium persulfate (5 g) and phosphorus pentoxide (5 g) in concentrated sulfuric acid solution (15 mL) at 80 °C, pre-oxidize for 6 hours, then cool to room temperature, filter, and wash to medium sex. Add pre-oxidized graphite powder (10 g) to 230 mL of concentrated sulfuric acid solution at 0°C, then carefully add 30 g of potassium permanganate, then react at 35°C for 2 hours, and finally add 1L of deionized solution to the reaction solution Water and 25mL of 30% hydrogen peroxide terminated the reaction, filtered, washed, and dialyzed to obtain graphite oxide.

[0028] In the second step, 80 mg of graphite oxide was ultrasonically dispersed in 60 mL of ethanol for 1 hour.

[0029]...

Embodiment 2

[0034] Implementation example 2: the preparation method of the nanometer zinc ferrite-graphene composite photocatalyst of visible light response of the present invention, comprises the following steps:

[0035] The first step is the same as Step 1 in Implementation Example 1.

[0036] The second step is the same as step two in the implementation example 1.

[0037] In the third step, 0.2975 g of zinc nitrate and 0.8080 g of ferric nitrate were dissolved in 20 mL of ethanol and stirred for 40 minutes.

[0038] In the fourth step, the second step is mixed with the third step, and stirred for 40 minutes.

[0039] In the fifth step, the reaction system in the fourth step was transferred to a 100 mL hydrothermal kettle, and reacted at 180° C. for 20 hours.

[0040] The sixth step is the same as step six in the implementation example 1.

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Abstract

The invention discloses a nano zinc ferrite-graphene composite photocatalyst of visible light response and a preparation method thereof. The composite photocatalyst is formed by compounding zinc ferrite and graphene in a mass ratio of 1:2-1:6. The preparation method comprises the following steps of: putting graphite oxide into ethanol to perform ultrasonic dispersion, adding ferric nitrate and zinc nitrate into the ethanol to perform dissolution with stirring, then mixing the two systems, transferring the mixed system to a hydrothermal kettle to perform reaction, and performing centrifugal separation, washing and drying on a product after the reaction is completed to obtain the nano zinc ferrite-graphene composite photocatalyst. The nano zinc ferrite-graphene composite photocatalyst with uniform granule size and uniform dispersion is prepared by using graphene as a supporting material and adopting a hydrothermal synthesis method. The prepared nano zinc ferrite-graphene composite photocatalyst has good application prospect and economic benefit on the aspect of sewage treatment.

Description

[0001] technical field [0002] The invention belongs to the preparation technology of nano-zinc ferrite composite photocatalyst with graphene as supporting material and deposited on its surface with uniform particle size and uniform dispersion, especially a nano-zinc ferrite-graphene composite photocatalyst responding to visible light. Catalyst and method for its preparation. Background technique [0003] In recent years, due to the global energy shortage, the problem of environmental degradation has become increasingly prominent. As a green energy technology, photocatalysis has attracted widespread attention of scientists in the effective treatment of environmental pollution. From the perspective of fully utilizing sunlight, it is of great practical significance to prepare a catalyst with photocatalytic activity under visible light. [0004] The energy band gap of zinc ferrite is relatively narrow, only 1.9eV, and both zinc and iron are environmentally friendly nutrients,...

Claims

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Application Information

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IPC IPC(8): B01J23/80A62D3/10B82Y30/00B82Y40/00
Inventor 汪信付永胜杨绪杰何光裕陈海群
Owner NANJING UNIV OF SCI & TECH
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