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Photocatalyst and preparation method and application thereof

A photocatalyst and catalyst technology, applied in the field of photocatalysis, can solve the problems of slow photoelectron-hole separation, limited photocatalytic performance of semiconductor materials, easy recombination of photogenerated carriers, and achieve low cost, good visible light absorption performance, The effect of simple preparation method and process

Inactive Publication Date: 2017-01-11
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the slow photoelectron-hole separation in monomeric photocatalysts and the easy recombination of photogenerated carriers, the photocatalytic performance of semiconductor materials is limited, and the construction of composite materials through semiconductor recombination can accelerate electron-hole separation and improve the photocatalytic properties of materials. Photocatalytic performance [5,6]

Method used

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  • Photocatalyst and preparation method and application thereof
  • Photocatalyst and preparation method and application thereof
  • Photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 0.002mol of KI and 0.008mol of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 40 mL of deionized water, and stirred for 30 min to obtain solution A. At the same time, 0.002moL of AgNO 3 and 0.008mol NH 4 VO 3 Dissolve in 40mL deionized water and stir for 30min to obtain solution B. Solution A was added dropwise to solution B with stirring. The above suspension was transferred to a 100mL reaction kettle after being stirred for 60min, and heated in water at 180°C for 24h. After cooling to room temperature, suction filter on a microporous membrane with a pore size of 0.45 μm, wash the product several times with ultrapure water and absolute ethanol, and place it in a vacuum drying oven at 60°C for 6 hours to obtain a sample marked as 20% AgI / BiVO 4 .

Embodiment 2

[0047] AgI / BiVO 4 Preparation method of heterojunction composite photocatalyst:

[0048] Prepared by co-precipitation and hydrothermal method, the difference from Example 1 is that the control of AgI and BiVO 4 The molar ratio of 1:9. 0.001mol of KI and 0.009mol of NH 4 VO 3 Dissolve in 40mL deionized water and stir for 30min to obtain solution A. At the same time, 0.001mol AgVO 3 and 0.009mol Bi(NO 3 ) 3 ·5H 2 O was dissolved in 40 mL deionized aqueous solution, and stirred for 30 min to obtain solution B. Solution A was then added dropwise to solution B with stirring. The above suspension was transferred to a 100mL reaction kettle after being stirred for 60min, and heated in water at 180°C for 24h. After cooling to room temperature, suction filter on a microporous membrane with a pore size of 0.45 μm, wash the product several times with ultrapure water and absolute ethanol, and place it in a vacuum drying oven at 60°C for 6 hours to obtain a sample marked as 10% Ag...

Embodiment 3

[0050] AgI / BiVO 4 Preparation method of heterojunction composite photocatalyst:

[0051] Prepared by co-precipitation and hydrothermal method, the difference from Example 1 is that the control of AgI and BiVO 4 The molar ratio is 3:7. 0.003mol of KI and 0.007mol of NH 4 VO 3 Dissolve in 40mL deionized water and stir for 30min to obtain solution A. At the same time, 0.003mol AgVO 3 and 0.007moL of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 40 mL of deionized water, and stirred for 30 min to obtain solution B. Solution A was then added dropwise to solution B with stirring. The above suspension was transferred to a 100mL reaction kettle after being stirred for 60min, and heated in water at 180°C for 24h. After cooling to room temperature, suction filter on a microporous membrane with a pore size of 0.45 μm, wash the product several times with ultrapure water and absolute ethanol, and place it in a vacuum drying oven at 60°C for 6 hours to obtain a sample marked as 30% AgI / BiV...

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Abstract

The invention belongs to the field of photocatalysis and particularly relates to AgI / BiVO4 heterojunction composite photocatalyst and preparation method and application thereof. The AgI / BiVO4 heterojunction composite photocatalyst is made from AgI and BiVO4, wherein a molar ratio of AgI and BiVO4 is 1:9 to 9:1. The AgI / BiVO4 heterojunction composite photocatalyst is prepared by hydrothermal process. The preparation method herein has simple process and is easy to control and low in cost, AgI / BiVO4 heterojunction structure responsive to visible light is constructed, separation of photo-induced carriers is accelerated, the chances of photo-induced carriers and hole pairs to recombine is reduced, the photocatalyst has efficient photocatalytic activity and stability in visible light, is efficient in killing harmful microorganisms and dye pollutants in water, and has high practical value and potential application prospect in the field of water purification and marine antifouling and other fields.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to an AgI / BiVO 4 Heterojunction composite photocatalyst and its preparation method and application. Background technique [0002] Biofouling is a problem that countries all over the world that develop and utilize marine resources need to face and solve. Biofouling is caused by the accumulation of marine microorganisms (bacteria, algae, mollusks, etc.) and their metabolites [1] . Marine biofouling can cause a series of economic and safety problems, including accelerating the corrosion of metals, shortening the service life of marine engineering, and reducing the output and quality of aquaculture. Traditionally, antifouling coatings have been used on ship hulls and marine engineering surfaces to reduce the hazards caused by biofouling. Moreover, the use of antifouling paint has indeed achieved a better antifouling effect. However, due to the toxicity of the antifouling coating itsel...

Claims

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Application Information

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IPC IPC(8): B01J27/08C02F1/30
CPCC02F1/30B01J27/08B01J37/031C02F2305/10B01J35/39Y02W10/37
Inventor 相振波张盾
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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