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Recyclable and reusable organic dye photocatalyst and preparation method thereof

A photocatalyst and organic dye technology, applied in the field of organic dye photocatalyst and its preparation, can solve the problems of compound reduction, destruction, degradation rate of organic dyes, etc., and achieve stability guarantee, high degradation rate, and easy magnetic recovery. Effect

Inactive Publication Date: 2012-10-10
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the magnetic material - TiO 2 There is a problem in the compound, that is, in the process of degrading the organic dye, the magnetic material in the compound is reduced, and the magnetic material-TiO 2 The complex structure is destroyed, thereby reducing the recovered complex, if the recovered magnetic material-TiO 2 The compound degrades the organic dye again, and the degradation rate of the organic dye will decrease significantly
Therefore, since the photocatalyst magnetic material-TiO 2 The stability of the structure of the composite material is not good, and the degradation rate of the organic dye that has been degraded for many times is obviously slowed down

Method used

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  • Recyclable and reusable organic dye photocatalyst and preparation method thereof
  • Recyclable and reusable organic dye photocatalyst and preparation method thereof
  • Recyclable and reusable organic dye photocatalyst and preparation method thereof

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[0031] The embodiment of the present invention discloses a method for preparing an organic dye photocatalyst composite that is easy to recycle and can be used repeatedly, comprising the following steps:

[0032] a) mixing graphene oxide solution, isopropyl titanate, sulfuric acid and alcohol to obtain a mixed solution;

[0033] b) heating and reacting the mixed solution to obtain a graphene-titanium dioxide composite;

[0034] c) The graphene-titania composite, containing Fe 2+ and Fe 3+ solution with OH - The solutions are mixed, heated and reacted to obtain a photocatalyst composite.

[0035] Step a) is the process of preparing the mixed solution. The ratio of the graphene oxide solution, sulfuric acid, isopropyl titanate and alcohol is preferably 4~10mL: 40~100μL: 110~250μL: 20~200mL. The graphene oxide solution is preferably graphene oxide prepared by the hummer method, and the concentration of the graphene oxide solution is preferably 0.5 mg / mL. After the mixed solut...

Embodiment 1

[0045] a) Take 7mL of 0.5mg / mL graphene oxide prepared by the hummers method and add it to 65mL of absolute alcohol;

[0046] b) Dissolve 180 μL of isopropyl titanate and 70 μL of concentrated sulfuric acid in 5 mL of absolute alcohol to obtain a mixture, which is slowly poured into the mixture obtained in step a), and the temperature is raised to 80°C and kept for 12 hours, and then the product Put it in an autoclave and seal it, and react at 200°C for 12h;

[0047] c) Disperse the product obtained in step b) in 30mL deionized water, stir with nitrogen gas, add 3.95mgFeCl 2 ·H 2 O and 60mgFeCl 3 ·H 2 1.56mL of deionized water with O, stirred for 5h under nitrogen, sealed the container, then slowly injected 4.6mL of 1.5mol / L ammonia water with a syringe, and raised the temperature to 65°C in a sealed state for 2.5h;

[0048] d) Wash the obtained product with deionized water, disperse the above product on a carbon-coated copper grid for electron microscope testing, and obta...

Embodiment 2

[0052] a) Soak the photocatalyst in the Rhodamine B solution for 12 hours to saturate the adsorption of Rhodamine B on its surface; recover the photocatalyst and disperse it in 71mL of deionized water;

[0053] b) The mixture in step a) is fully shaken to disperse the photocatalyst in deionized water evenly, take 100 μL of the photocatalyst mixture, and place it in a 5mL7.7×10 -6 In the Rhodamine B solution of mol / L, the pH value of Rhodamine B solution is 7.03;

[0054] c) Under the irradiation of Philip-TUV / 15W ultraviolet lamp, stir the mixture obtained in step b), and after degrading for 5 minutes, attract the photocatalyst to the side of the quartz bottle with a magnet, and take 2mL of the reaction solution to measure the absorption spectrum;

[0055] d) Repeat c) of this embodiment until the reaction solution is colorless, that is, Rhodamine B is completely degraded, and then the photocatalyst is recovered with a magnet;

[0056] e) Repeat step a) to step d) of this exa...

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Abstract

The invention provides a preparation method for a recyclable and reusable organic dye photocatalyst composite. The preparation method includes a) mixing graphene oxide liquor, titanium isopropoxide sulfuric acid and alcohol together to obtain mixed liquor; b) heating the mixed liquor and enabling the mixed liquor to react to obtain a graphene and titanium oxide composite; and c) mixing, heating and enabling the graphene and titanium oxide composite, liquor containing Fe2+ and Fe3+ and liquor containing OH- to react to obtain a graphene, titanium dioxide and ferroferric oxide photocatalyst. The invention further provides the photocatalyst composite which comprises a graphene layer, a titanium dioxide granular layer and a ferroferric oxide layer. The titanium dioxide granular layer is positioned on the graphene layer, and the ferroferric oxide layer is positioned on the titanium dioxide granular layer. The photocatalyst composite is fine in structural stability, and has high degradation rate after being used for degrading organic dye for multiple times.

Description

technical field [0001] The invention relates to the technical field of nanocomposite materials, in particular to an organic dye photocatalyst that is easy to recycle and can be used repeatedly and a preparation method thereof. Background technique [0002] Energy resources, cultivated land resources and water resources are called the three important strategic resources supporting the sustainable development of my country's economy and society. With the acceleration of global economic and industrial development and the intensification of human activities, the problem of water pollution has become increasingly serious and has become a global crisis facing mankind. The discharge of industrial wastewater has become the main source of water pollution. [0003] With the rapid development of the dye textile industry, the variety and quantity of dyes are constantly increasing. Synthetic dye factories and printing and dyeing factories discharge a large amount of dye wastewater every...

Claims

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Application Information

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IPC IPC(8): B01J23/745C02F1/32C02F101/30C02F101/38
CPCY02W10/37
Inventor 林岳耿志刚宋雨晴曾杰潘楠王晓平
Owner UNIV OF SCI & TECH OF CHINA
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