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Preparation method of AgBr/Ag2CrO4 n-n hetero-junction composite photocatalyst

A heterojunction, silver chromate technology, applied in the field of photocatalytic materials, can solve the problems of easy recombination of electrons and holes, reduced photocatalytic effect, narrow band gap, etc. Catalytic effect, good photocatalytic effect

Inactive Publication Date: 2019-01-04
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But since Ag 2 CrO 4 The band gap is narrow, and the generated electrons and holes are easy to recombine, which reduces the photocatalytic effect
Moreover, the active substances produced during the photocatalytic process tend to deactivate silver ions due to oxidation, reducing the recycling efficiency.

Method used

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  • Preparation method of AgBr/Ag2CrO4 n-n hetero-junction composite photocatalyst
  • Preparation method of AgBr/Ag2CrO4 n-n hetero-junction composite photocatalyst
  • Preparation method of AgBr/Ag2CrO4 n-n hetero-junction composite photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0032] 1) In the dark condition, 0.006moLAgNO 3 Disperse in 25mL deionized water and stir to form mixed solution A; 0.003molNa 2 CrO 4 4H 2 O was dispersed in 25 mL of deionized water to form solution B, and then solution B was added dropwise to solution A and stirred for 1 h, then allowed to stand for 4 h, the product was washed several times with deionized water and absolute ethanol, and dried at 60 °C for 10 h.

[0033] 2) Add 0.003moL of the above-prepared Ag 2 CrO 4 Disperse in 25mL of deionized water; then add 20mL of 0.1mol / L KBr solution dropwise, stir for 4h and then let it stand, the product was washed several times with deionized water and absolute ethanol, and dried at 60°C for 10h. Obtain AgBr / Ag with a molar ratio of 1:1 2 CrO 4 .

Embodiment 2

[0035] 1) In the dark condition, 0.006moLAgNO 3 Disperse in 25mL deionized water and stir to form mixed solution A; 0.003molNa 2 CrO 4 4H 2 O was dispersed in 25 mL of deionized water to form solution B, and then solution B was added dropwise to solution A and stirred for 1 h, then allowed to stand for 4 h, the product was washed several times with deionized water and absolute ethanol, and dried at 60 °C for 10 h.

[0036] 2) Add 0.003moL of the above-prepared Ag 2 CrO 4 Disperse in 25mL of deionized water; then add 12mL of 0.1mol / L KBr solution dropwise, stir for 4h and then let stand, the product was washed several times with deionized water and absolute ethanol, and dried at 60°C for 10h. Obtain AgBr / Ag with a molar ratio of 1:2 2 CrO 4 .

Embodiment 3

[0038] 1) In the dark condition, 0.006moLAgNO 3 Disperse in 25mL deionized water and stir to form mixed solution A; 0.003molNa 2 CrO 4 4H 2 O was dispersed in 25 mL of deionized water to form solution B, and then solution B was added dropwise to solution A and stirred for 1 h, then allowed to stand for 4 h, the product was washed several times with deionized water and absolute ethanol, and dried at 60 °C for 10 h.

[0039] 2) Add 0.003moL of the above-prepared Ag 2 CrO 4 Disperse in 25mL of deionized water; then add 8.5mL of 0.1mol / L KBr solution dropwise, stir for 4h and then let stand, the product was washed several times with deionized water and absolute ethanol, and dried at 60°C for 10h. Obtain AgBr / Ag with a molar ratio of 1:3 2 CrO 4 .

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Abstract

The invention discloses a preparation method of an AgBr / Ag2CrO4 n-n hetero-junction composite photocatalyst. The preparation method comprises steps as follows: firstly, Na2CrO4.4H2O is added to deionized water under the dark condition, and a solution A is formed; AgNO3 is added to the deionized water, and a solution B is formed; the solution B is dropwise added to the solution A, a mixed solutionis formed, continuously stirred and then left to stand, an obtained product is subjected to suction filtration, washing is repeated with ethanol and deionized water, and a product Ag2CrO4 is obtainedby drying; under the dark condition, the product Ag2CrO4 is dispersed in the deionized water, a dispersion liquid of Ag2CrO4 is obtained, a KBr solution is prepared, the KBr solution is dropwise addedto the dispersion liquid of Ag2CrO4, stirred and left to stand, an obtained product is washed repeatedly with absolute ethanol and the deionized water and dried, and the AgBr / Ag2CrO4 n-n hetero-junction composite photocatalyst is obtained. According to the preparation method, an n-n hetero-junction is constructed between AgBr and Ag2CrO4, so that composite annihilation of carriers can be effectively prevented, and activity of the composited AgBr / Ag2CrO4 photocatalyst is obviously better than that of AgBr and Ag2CrO4.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to a method for preparing a silver bromide / silver chromate n-n heterojunction composite photocatalyst. Background technique [0002] Semiconductor photocatalytic technology has great application prospects in environmental protection due to its advantages of no pollution and low energy consumption. Among many semiconductor materials, silver-based semiconductors have the characteristics of strong photoresponse ability, high electron yield, and strong oxidation ability, and have great potential in the field of photocatalysis. However, in the current research content, for Ag in silver-based semiconductors, 2 CrO 4 There are fewer reports on semiconductors. For example Ag 2 Mo 2 o 7 , AgX, Ag 3 PO 4 Silver-based semiconductors have been extensively studied in the field of photocatalysis and have achieved excellent results. [0003] The document "Chinese Patent CN106669744...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/08C02F1/30C02F101/34C02F101/36C02F101/38
CPCC02F1/30B01J23/002B01J27/08C02F2101/38C02F2101/36C02F2101/34C02F2101/308C02F2305/10B01J35/23B01J35/39
Inventor 黄凤萍辛萌周鑫敏刘博学李春花
Owner SHAANXI UNIV OF SCI & TECH
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