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Bismuth ferrite-graphene nanometer composite material for the filed of photocatalysis and preparation method thereof

A nanocomposite material and graphene technology, applied in the field of bismuth ferrite-graphene composite material and its preparation, can solve the problems of low photocatalytic efficiency, high recombination rate of photogenerated electrons and holes, low quantum efficiency, etc. The effect of large surface area, excellent photocatalytic performance and high utilization rate

Inactive Publication Date: 2013-02-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, semiconductor photocatalytic materials (such as TiO 2 ) also has the following main problems: one is the TiO with rutile structure 2 The forbidden band width is 3.0eV, and its absorption edge is 415nm, which belongs to the ultraviolet and near-ultraviolet light region, but the proportion of ultraviolet band energy in sunlight is low, and the photocatalytic efficiency is lower than 1%. The recombination rate of holes is very high, so that the quantum efficiency is low

Method used

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  • Bismuth ferrite-graphene nanometer composite material for the filed of photocatalysis and preparation method thereof
  • Bismuth ferrite-graphene nanometer composite material for the filed of photocatalysis and preparation method thereof
  • Bismuth ferrite-graphene nanometer composite material for the filed of photocatalysis and preparation method thereof

Examples

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Embodiment 1

[0028] Example 1, Preparation of bismuth ferrite-graphene nanocomposite material and evaluation of photocatalytic effect

[0029] According to the molar ratio of bismuth nitrate (0.0033mol) and ferric nitrate (0.003mol) 1.1:1, add 100ml2mol / L of HNO 3 , stirred for about half an hour until it was completely dissolved, and the solution was colorless and transparent, and then 12mol / L KOH solution was added dropwise until the brick red precipitate no longer increased. Then add 0.05g KNO 3 Stir until completely dissolved. Add 0.02 g of graphene, and ultrasonically disperse for 2 hours to obtain a uniformly mixed precursor solution. The above mixed solution was transferred to a reaction kettle, and heated to 200°C at a heating rate of 5°C / min for 12 hours to obtain black BiFeO 3 - Graphene composite material 1.03g. Measured by thermogravimetric method, BiFeO in the obtained composite material 3 The mass is 0.98g.

[0030] figure 1 It is the XRD pattern of the product, and it...

Embodiment 2

[0032] Example 2, Preparation of bismuth ferrite-graphene nanocomposite material and evaluation of photocatalytic effect

[0033] According to the molar ratio of bismuth nitrate (0.0033mol) and ferric nitrate (0.003mol) 1.1:1, add 100ml2mol / L of HNO 3 , stirred for about half an hour until completely dissolved, the solution was colorless and transparent, and then 12mol / L KOH solution was dropped to form a brick red precipitate. Then add 0.05g KNO 3 Stir until completely dissolved. Add 0.03 g of graphene, and ultrasonically disperse for 2 hours to obtain a uniformly mixed precursor solution. The above mixed solution was transferred to the reaction kettle, and heated to 200°C at a heating rate of 5°C / min for 24 hours to obtain black BiFeO 3 -graphene composite 1.04g. Measured by thermogravimetric method, BiFeO in the obtained composite material 3 The mass is 0.95g.

[0034] Figure 4 BiFeO prepared for this example 3 -SEM image of graphene composite material, BiFeO with ...

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Abstract

The invention discloses a bismuth ferrite-graphene nanometer composite material and a preparation method thereof. The composite material is composed of graphene and BiFeO3 nanoparticles coated on the surface of graphene. The BiFeO3 nanoparticles have a diameter of 100-500nm, and the graphene has a diameter of 5-10 mum and thickness of 2-15nm. The preparation method is as follows: first, preparing BiFeO3 precursor nanoparticles by a co-precipitation method; and then mixing the nanoparticles with the graphene for a hydrothermal reaction, so as to prepare the bismuth ferrite-graphene composite material. The bismuth ferrite-graphite composite material provided by the invention has band gap of 1.78-2.15eV, strong visible light absorption, and large specific surface area, and can effectively improve separation of photo-generated carriers, reduce recombination rate of the carriers, and show photocatalytic performance more excellent than that of nanoparticles. Experiments show that the nanometer composite material can degrade more than 80% of target degradation product in 2 h, so as to demonstrate excellent visible photocatalytic activity.

Description

technical field [0001] The invention relates to a bismuth ferrite-graphene composite material used in the field of photocatalysis and a preparation method thereof. Background technique [0002] Since the beginning of the new century, global environmental pollution problems have become more and more serious, especially in my country, where the economy is developing rapidly. Degradation of environmental pollutants has become an increasingly urgent task. Among many pollution control methods, photocatalysis has unique advantages. Photocatalysis enables reactions that are difficult to achieve in many cases to proceed smoothly under milder conditions. Although the complex reaction mechanism of photocatalysis has not been fully understood, the applied research has achieved remarkable results. with TiO 2 The representative environmental photocatalytic technology has many applications in the field of applied research: air purification, sewage treatment, self-cleaning technology, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/843
Inventor 沈洋李卓旋关玉函南策文林元华
Owner TSINGHUA UNIV
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