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Method for preparing TiO2/g-C3N4 quantum dot composite catalyst

A composite catalyst and titanium dioxide technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of high catalytic efficiency, simple preparation process, and increased stability

Inactive Publication Date: 2016-11-09
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a titanium dioxide / g-C 3 N 4 Preparation method of quantum dot composite catalyst to solve the problem of efficient treatment of organic wastewater

Method used

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  • Method for preparing TiO2/g-C3N4 quantum dot composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Use a graduated cylinder to measure 35mL of absolute ethanol into a clean beaker A, slowly add 10mL of n-butyl titanate under strong stirring, and then stir vigorously for 20 minutes to obtain a mixed solution of ethanol and tetra-n-butyl titanate a.

[0018] 2) Measure 35mL of absolute ethanol into a clean beaker B, add 4mL of glacial acetic acid and 10mL of deionized water into the beaker of B, and stir vigorously for 20min to obtain a mixed solution B of ethanol, glacial acetic acid and deionized water. Add an appropriate amount of concentrated hydrochloric acid dropwise to adjust the pH.

[0019] 3) Place beaker B in a water bath at 25°C and stir vigorously, suspend solution A and slowly drop into beaker B.

[0020] 4) After the dropwise addition, continue to stir at a low speed until a gel is formed. And stand in a 40°C water bath until the gel is complete

[0021] 5) Dry the obtained gel at 80°C for 12 hours. The dried samples were ground.

[0022] 6) Calc...

Embodiment 2

[0028] In step (7), add 98ml deionized water, and in step (8), add g-C 3 N 4 Quantum dot solution 2ml, other steps are the same as in Example 1.

[0029] The resulting product is TiO 2 -CNQDs2.0ml, used to degrade 50ml, 10PPm methyl orange solution under simulated sunlight, after 100min, the degradation rate reached 90.15%.

Embodiment 3

[0031] In step (7), 96ml of deionized water was added, and in step (8), 4ml of g-C3N4 quantum dot solution was added, and other steps were the same as in Example 1.

[0032] The resulting product is TiO 2 -CNQDs4.0ml was used to degrade 50ml 10PPm methyl orange solution under simulated sunlight, and the degradation rate reached 91.38% after 120min.

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Abstract

The invention provides a method for preparing a binary composite catalyst from nano-TiO2 particles and g-C3N4 quantum dots with a sol-gel method. The method comprises the following steps: anatase nano-TiO2 particles are prepared firstly with the sol-gel method, then the g-C3N4 quantum dots are added to the nano-TiO2 particles, ultrasonic processing and water bath heating stirring are performed, the nano-TiO2 particles and the g-C3N4 quantum dots are mixed, and the heterojunction composite material with excellent photocatalytic performance is obtained. Compared with the conventional TiO2 materials, the composite material has excellent photocatalytic performance and has very good application prospect in the field of photocatalysis treatment of organic pollutants.

Description

technical field [0001] The present invention relates to a kind of titanium dioxide / g-C 3 N 4 The invention relates to a method for preparing a quantum dot composite catalyst, specifically belonging to the technical field of photocatalytic composite material preparation. Background technique [0002] The photocatalytic activity of titanium dioxide is limited by its forbidden band width (the forbidden band width of the rutile phase is 3.0eV, while that of the anatase phase is 3.2eV), and it can only be excited by ultraviolet light with a wavelength of less than 380nm. On the other hand, when the TiO2 photocatalyst is irradiated by sunlight, the electron-hole pairs excited by the sunlight do not migrate to the surface rapidly, but recombine rapidly inside, which becomes another factor limiting its photocatalytic activity. Therefore, it is a challenging problem to synthesize TiO2 photocatalysts with narrow energy band width and suppress the recombination of photogenerated el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30
CPCC02F1/30B01J21/063B01J27/24C02F2101/308C02F2305/10B01J35/39Y02W10/37
Inventor 谢宇郭若彬许秋华戴玉华凌云
Owner NANCHANG HANGKONG UNIVERSITY
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