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Preparation method and application for ternary composite photocatalyst

A ternary composite, photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve problems such as low photocatalytic efficiency

Inactive Publication Date: 2018-08-31
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 There are two major defects: (1) wide bandgap (3.0-3.2eV) TiO 2 The responsive ultraviolet light region only accounts for about 5% of sunlight; (2) The large recombination of electrons and holes in photogenerated carriers leads to low overall photocatalytic efficiency
However, so far there is no C@TiO 2-x / g -C 3 N 4 Preparation of Heterojunction and Report on Photocatalytic Application

Method used

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  • Preparation method and application for ternary composite photocatalyst
  • Preparation method and application for ternary composite photocatalyst
  • Preparation method and application for ternary composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The preparation method of this ternary composite photocatalyst comprises the following steps:

[0061] Prepare g-C 3 N 4 catalyst of light:

[0062] Weigh 10g of urea into a crucible, cover the crucible, place it horizontally in a muffle furnace, and calcinate at 600°C for 4 hours. 3 N 4 sample.

Embodiment 2

[0064] The preparation method of this ternary composite photocatalyst comprises the following steps:

[0065] Preparation of single carbon spheres:

[0066] At room temperature, slowly add 4.0 g of ground dextrose monohydrate into 40 mL of ultrapure water, stir well, place it in a 50 mL stainless steel autoclave, heat to 180 ° C for 6 h; After washing with pure water and absolute ethanol for 6 times, vacuum drying at 60°C for 10 hours, the carbon sphere material with uniform size was obtained.

Embodiment 3

[0068] The preparation method of this ternary composite photocatalyst comprises the following steps:

[0069] Preparation of C@TiO 2-x Composite material:

[0070] 1. Preparation of monomeric carbon spheres

[0071] 1. At room temperature, take 4.5g of glucose monohydrate and slowly add it to 45ml of pure water. After fully stirring, place it in a 50mL stainless steel autoclave and heat it to 180°C for 6 hours;

[0072] 2. After the reaction, wash with ultra-pure water and absolute ethanol for 6 times, and vacuum-dry at 60°C for 10 hours to obtain carbon sphere materials with uniform size.

[0073] 2. Preparation of C@TiO 2-x composite material

[0074] 1. Take 0.2g of carbon spheres and add them to a mixed solution of 35mL of absolute ethanol and 0.1mL of ultrapure water, and sonicate for 0.5h to obtain dispersion A;

[0075] 2. Take 2mL of tetrabutyl titanate and slowly add it into 40mL of absolute ethanol, stir and mix well to obtain dispersion B;

[0076] 3. Slowly d...

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Abstract

The invention provides a preparation method for a ternary composite photocatalyst. The method comprises the following steps: slowly adding carbon spheres into an aqueous solution containing absolute ethanol, and performing stirring to obtain a dispersion liquid A; slowly adding tetrabutyl titanate into anhydrous ethanol, performing full stirring to obtain a dispersion liquid B; slowly adding the dispersion liquid B into the dispersion liquid A, and uniformly depositing a layer of reduction type TiO2-x on the surfaces of the carbon spheres through a solvothermal method to obtain a C@TiO2-x composite material; dispersing g-C3N4 into pure water to obtain a mixed liquid F; and dispersing the C@TiO2-x composite material into the mixed liquid F, and performing hydrothermal synthesis to obtain the ternary C@TiO2-x / g-C3N4 heterojunction material. According to the method provided by the invention, the ternary composite photocatalyst prepared by the method is a ternary heterojunction material, can be used for degrading medical wastewater such as 2,4,6-trichlorophenol under visible light and preparing hydrogen by photolysis of water, and has good photocatalytic performance.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial synthesis and relates to a preparation method of a visible light responsive C@TiO2-x / g-C3N4 heterojunction material, in particular to a preparation method and application of a ternary composite photocatalyst. Background technique [0002] With the rapid development of industrialization, energy shortage and environmental pollution have become two key issues that threaten human society and life on earth. Based on the unique properties of solar energy conversion and pollutant removal, photocatalytic technology is regarded as an important strategy for environmental governance and clean energy regeneration. The highly promising semiconductor anatase titanium dioxide (TiO 2 ), have been widely used in the fields of hydrogen production, photocatalysis, and optoelectronics due to low cost, good chemical stability, and no pollution. However, TiO 2 There are two major defects: (1) wide bandgap (3.0-...

Claims

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Application Information

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IPC IPC(8): B01J27/24C01B3/04C02F1/30C02F101/34
CPCC01B3/042C02F1/30B01J27/24C02F2305/10C02F2101/345C01B2203/1041C01B2203/0277B01J35/39Y02E60/36
Inventor 鲜啟鸣朱成章陈晓孙春蕾吴昊
Owner NANJING UNIV
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