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Method for synthesis of carbon quantum dot solution by hydrothermal process to prepare composite nano-photocatalyst

A nano-photocatalyst, carbon quantum dot technology, applied in chemical instruments and methods, physical/chemical process catalysts, nanotechnology for materials and surface science, etc. The problem of high probability of hole recombination, to achieve the effect of large specific surface area, cheap and easily available raw materials, and promoting the mass transfer process

Inactive Publication Date: 2014-01-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for this catalyst, there are also some obvious defects. First, when sunlight or visible light is used as the light source, the efficiency of utilizing light energy is low, and less than 5% of sunlight can be utilized; Second, the recombination probability of electrons and holes on the surface is relatively high, which limits the catalytic performance

Method used

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  • Method for synthesis of carbon quantum dot solution by hydrothermal process to prepare composite nano-photocatalyst
  • Method for synthesis of carbon quantum dot solution by hydrothermal process to prepare composite nano-photocatalyst
  • Method for synthesis of carbon quantum dot solution by hydrothermal process to prepare composite nano-photocatalyst

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Embodiment 1

[0025] Embodiment 1: Synthesis of carbon quantum dots by hydrothermal method

[0026] Weigh 1.10g vitamin C and dissolve it in a mixed solution of 25mL deionized water and 25mL absolute ethanol. Stirring vigorously for 2 hours gave a clear and transparent solution. The solution was transferred to a reaction kettle, and after reacting at 180° C. for 4 h, a dark brown product was obtained. The product was extracted with dichloromethane, and the obtained upper aqueous phase was purified by dialysis through a dialysis membrane with a molecular weight of 1000, and finally a yellow solution containing carbon quantum dots was obtained. The up-conversion characteristics of the prepared carbon quantum dots are shown in figure 1 Under different excitation light, different fluorescence is emitted.

Embodiment 2

[0028] According to the preparation method of Example 1, the reaction time was 2 h, and a yellow solution of carbon quantum dots was prepared.

Embodiment 3

[0030] According to the preparation method of Example 1, the reaction temperature was 6h, and a yellow solution of carbon quantum dots was prepared.

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Abstract

The invention presents a method for synthesis of a carbon quantum dot modified TiO2 composite nano-photocatalyst. The method includes: using vitamin C as a carbon source, in a mixed solution of ethanol absolute and deionized water, preparing a carbon quantum dot with an up-conversion characteristic by a hydrothermal process, then preparing spherical TiO2 powder by a sol-gel process, mixing the spherical TiO2 powder with a carbon quantum dot solution, and performing drying, thus obtaining the composite nano-photocatalyst. The method provided in the invention makes use of the up-conversion characteristic of the carbon quantum dot to modify TiO2 so as to prepare the composite nano-photocatalyst, has the advantages of simple operation, and low cost, etc., and has very high practical value and application prospects.

Description

technical field [0001] The invention relates to a synthesis method of a visible light-responsive photocatalyst, in particular to a preparation of a carbon quantum dot modified titanium dioxide composite nano photocatalyst synthesized by a hydrothermal method. Background technique [0002] With the rapid increase of my country's population and the rapid development of social economy, environmental problems have become increasingly prominent, and have become the primary issues affecting my country's socialist modernization and the production and life of the people. Among them, water pollution is particularly serious. Since the n-type semiconductor TiO 2 Since the photoelectrocatalytic decomposition of water was found on the electrode, the TiO 2 As a photocatalyst for sewage treatment and other research has attracted great attention. TiO 2 Photocatalysts have relatively stable chemical properties, low cost, low toxicity, high catalytic activity, and strong oxidation ability...

Claims

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Application Information

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IPC IPC(8): B01J21/18B82Y30/00B82Y40/00
Inventor 石勇柯军李新勇肇启东薛方红
Owner DALIAN UNIV OF TECH
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