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High-activity mpg-C3N4/BiVO4/TiO2 heterojunction photocatalyst and preparation method thereof

A mpg-c3n4, photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of low photocatalytic activity of a single catalyst, achieve good response, improve Longevity and uniform appearance

Inactive Publication Date: 2016-10-26
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low photocatalytic activity of a single catalyst, and to provide a preparation method of calcination-hydrothermal synthesis ternary composite catalyst mpg-C3N4 / BiVO4 / TiO2

Method used

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  • High-activity mpg-C3N4/BiVO4/TiO2 heterojunction photocatalyst and preparation method thereof
  • High-activity mpg-C3N4/BiVO4/TiO2 heterojunction photocatalyst and preparation method thereof
  • High-activity mpg-C3N4/BiVO4/TiO2 heterojunction photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Dissolve 1g of dicyandiamide in 30ml of water, soak 0.5g of SBA-15 in the solution, and stir at room temperature for 2h. The resulting mixture was dried in an oven at 70°C for 24h to remove moisture, and then calcined at 550°C for 4h under a nitrogen atmosphere with a heating rate of 2.3°C min-1. The sample was stirred in a 2M NH4HF2 solution for 48 hours to remove the template, then centrifuged, washed with water and ethanol three times, and placed in an oven at 70°C to obtain a light yellow powder. Weigh 92mg mpg-C3N4 and disperse it in 35ml deionized water, add 40mg SDBS and 1.4mmol Bi(NO3)3·5H2O, stir to dissolve, then add 1.4mmol NH4VO3 and 2mmol TBOT respectively, and stir at room temperature for 15min. Then the resulting suspension was transferred to a 50ml autoclave containing a polytetrafluoroethylene liner and kept at a constant temperature of 180°C for 20h. After the reactor was naturally cooled to room temperature, it was centrifuged, washed with water, and...

Embodiment 2

[0029] Weigh 18 mg of mpg-C3N4 prepared in Example 1 and disperse it in 35 ml of deionized water, add 40 mg of SDBS and 1.4 mmol of Bi(NO3)3·5H2O and stir to dissolve, then add 1.4 mmol of NH4VO3 and 2 mmol of TBOT in sequence, and stir at room temperature for 15 min. Then the resulting suspension was transferred to a 50ml autoclave containing a polytetrafluoroethylene liner and kept at a constant temperature of 180°C for 20h. After the reactor was naturally cooled to room temperature, it was centrifuged, washed with water, and washed with ethanol three times, and placed in an oven at 70°C to finally obtain a dark yellow mpg-C3N4 / BiVO4 / TiO2=1:7:10 ternary heterojunction photocatalyst. For mpg-C3N4 / BiVO4 / TiO2-1710.

[0030] Carry out FT-IR characterization to the mpg-C3N4 / BiVO4 / TiO2-1710 that embodiment 2 makes, as figure 2 shown. From the infrared spectrum, it is found that the absorption wavelengths at 1620, 1563 and 1411cm-1 are the stretching vibrations of aromatic C-N, ...

Embodiment 3

[0032] Weigh 55 mg of mpg-C3N4 prepared in Example 1 and disperse it in 35 ml of deionized water, add 40 mg of SDBS and 1.4 mmol of Bi(NO3)3·5H2O, stir and dissolve, then add 1.4 mmol of NH4VO3 and 2 mmol of TBOT in sequence, and stir at room temperature for 15 min. Then the resulting suspension was transferred to a 50ml autoclave containing a polytetrafluoroethylene liner and kept at a constant temperature of 180°C for 20h. After the reactor was naturally cooled to room temperature, it was centrifuged, washed with water, and washed with ethanol three times, and placed in an oven at 70°C to finally obtain a dark yellow mpg-C3N4 / BiVO4 / TiO2=3:7:10 ternary heterojunction photocatalyst. For mpg-C3N4 / BiVO4 / TiO2-3710.

[0033]The mpg-C3N4 / BiVO4 / TiO2-3710 prepared in Example 3 was characterized by TEM. Such as image 3 As shown, Figure a is the hierarchical structure of dendritic bismuth vanadate, and its minimum microstructure unit size is 300nm, which belongs to the submicron str...

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Abstract

The invention discloses a preparation method of a high-activity mpg-C3N4 / BiVO4 / TiO2 heterojunction photocatalyst. Firstly, SBA-15 is taken as a template, dicyandiamide is taken as a raw material and subjected to thermal polymerization, and graphite-like C3N4 powder adopting a mesoporous structure is prepared and uniformly dispersed in deionized water; bismuth nitrate pentahydrate and ammonium metavanadate in an equal molar ratio are added to an mpg-C3N4 solution, a certain quantity of TBOT solutions is evenly dropwise added, a suspended mixed precursor solution is formed, and finally, the mpg-C3N4 / BiVO4 / TiO2 composite photocatalyst is prepared with a hydrothermal method. The preparation method adopts a simple process, the cost is low, the prepared heterojunction photocatalyst can rapidly separate photoproduction electrons and holes, the life of photoelectrons is prolonged, the recombination rate of the photoelectrons and holes is reduced, and the heterojunction photocatalyst has good response to visible light.

Description

technical field [0001] The invention belongs to the fields of photocatalysis, composite materials and sewage treatment, and particularly relates to a mpg-C3N4 / BiVO4 / TiO2 heterojunction photocatalyst and a preparation method thereof. Background technique [0002] Semiconductor catalyst TiO2 has attracted widespread attention due to its application prospects in solar energy conversion and environmental purification. So far, TiO2 has many well-known properties: high redox potential, thermodynamic stability, cheap, non-toxic. However, pure TiO2 has always had some disadvantages, including only absorbing ultraviolet light due to its own wide band gap, and at the same time, the rapid recombination of photogenerated electron-hole pairs leads to low quantum efficiency and other defects. These defects have caused great challenges to the application of TiO2. Therefore, researchers have made great efforts to solve all the defects of pure TiO2, including element doping and recombinati...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30
CPCC02F1/30B01J27/24C02F2305/10B01J35/39Y02W10/37
Inventor 王风云沈新林李克斌王有亮
Owner NANJING UNIV OF SCI & TECH
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