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Ag@Ag2O/BiOCl composite material high in catalytic degradation activity and preparation method thereof

A composite material, 3·5H2O technology, applied in chemical instruments and methods, chemical/physical processes, water/sludge/sewage treatment, etc., can solve environmentally unfriendly organic solvents, surfactants, obstacles, inability to excite, etc. problem, to achieve high efficiency separation and transfer efficiency, high efficiency degradation catalytic process, and reduce the amount of Ag

Inactive Publication Date: 2019-07-30
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it also has obstacles in photocatalysis: the wide band gap (3.2-3.5eV) makes it only excited under ultraviolet light, but cannot be excited under visible light, which greatly affects its application.
[0004] Aiming at the above problems, a lot of research work includes depositing noble metals Au, Pt, doping C, Fe elements, etc. and constructing heterostructure BiOCl / Bi 2 o 2 CO 3 and other methods are used to improve the photocatalytic performance of BiOCl, but noble metal elements such as Au and Pt are expensive, and the synthesis cost is high, and in the synthesis process, it is usually necessary to add environmentally unfriendly organic solvents, surfactants, etc., the preparation process is complex and Not environmentally friendly

Method used

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  • Ag@Ag2O/BiOCl composite material high in catalytic degradation activity and preparation method thereof
  • Ag@Ag2O/BiOCl composite material high in catalytic degradation activity and preparation method thereof
  • Ag@Ag2O/BiOCl composite material high in catalytic degradation activity and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] Synthesis of BiOCl nanosheets with exposed {001} facets: 30 mL of Bi(NO 3 ) 3 ·5H 2 O and 30 mL of 3 g / L KCl suspension were sonicated at room temperature for 1 h, and then the KCl solution was added dropwise to the Bi(NO 3 ) 3 ·5H 2 O solution and stirred for 1 hour, after which, the resulting suspension was transferred to a polytetrafluoroethylene-lined high-pressure hydrothermal reactor and heated at 160 °C for 24 hours, cooled to room temperature, and deionized water and After alternate washing with absolute ethanol for 3 times, BiOCl nanosheets with exposed {001} crystal facets were obtained.

[0038] The prepared BiOCl nanosheets were used to photodegrade organic pollutants according to the aforementioned method for degrading organic matter: the results showed that the removal rates of Rhodamine B and methylene blue by BiOCl nanosheets were 16% and 13%, respectively.

Embodiment 2

[0040] Synthesis of BiOCl nanosheets with exposed {001} facets: 30 mL of Bi(NO 3 ) 3 ·5H 2 O and 30 mL of 2 g / L KCl suspension were sonicated at room temperature for 0.5 h, and then the KCl solution was added dropwise to the Bi(NO 3 ) 3 ·5H 2 O solution and stirred for 2 hours. Afterwards, the resulting suspension was transferred into a Teflon-lined autoclave hydrothermal reactor and heated at 140 °C for 24 h. After cooling to room temperature, the BiOCl nanosheets with exposed {001} crystal facets were obtained after alternately washing three times with deionized water and absolute ethanol.

[0041] The prepared BiOCl nanosheets with exposed {001} crystal facets were used to degrade target pollutants according to the aforementioned method for degrading organic matter. The results showed that the removal rates of Rhodamine B and methylene blue by BiOCl nanosheets were 14% and 10%, respectively.

Embodiment 3

[0043] Synthesis of BiOCl nanosheets with exposed {001} facets: 30 mL of Bi(NO 3 ) 3 ·5H 2 O and 30 mL of a 2.25 g / L KCl suspension were sonicated at room temperature for 0.5 h, and then the KCl solution was added dropwise to the Bi(NO 3 ) 3 ·5H 2 O solution and stirred for 1 hour. Afterwards, the resulting suspension was transferred to a 100 mL Teflon-lined high-pressure hydrothermal reactor and heated at 220 °C for 20 h. After cooling to room temperature, the BiOCl nanosheets with exposed {001} crystal facets were obtained after alternately washing three times with deionized water and absolute ethanol.

[0044] The prepared BiOCl nanosheets with exposed {001} crystal facets were used to degrade target pollutants according to the aforementioned method for degrading organic matter. The results showed that the removal rates of Rhodamine B and methylene blue by BiOCl nanosheets were 17% and 12%, respectively.

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Abstract

The invention discloses an Ag@Ag2O / BiOCl composite material high in catalytic degradation activity and a preparation method thereof, and belongs to the technical field of photocatalyst preparation. According to the material, bismuth pentahydrate and potassium chloride are prepared into BiOCl nanosheets with exposed {001} crystal faces, and then by means of a photo-reduction assisted in-situ calcinations oxidizing method, the Ag@Ag2O / BiOCl composite material with Ag@Ag2O loaded on the BiOCl{001} crystal faces is finally obtained. The synthesized Ag@Ag2O / BiOCl has higher charge separation and transfer efficiency; compared with pure BiOCl, the visible light absorption capacity of the composite material is enhanced, so that the organic pollutant catalytic degradation activity under visible light is higher. The degradation rates of the synthesized Ag@Ag2O / BiOCl on rhodamine B and methylene blue are 92% and 85% respectively, and the practical application value is relatively high.

Description

technical field [0001] The invention relates to a Ag@Ag with high catalytic degradation activity 2 O / BiOCl composite material and its preparation method, especially a kind of Ag@Ag with high catalytic degradation activity under visible light 2 An O / BiOCl composite material belongs to the technical field of photocatalyst preparation. Background technique [0002] Semiconductor photocatalytic technology has gone through 40 years of research and development, and has made great progress. It not only puts forward the basic principles and concepts for common use in theory, but also makes a series of achievements in the application of reagents. In recent years, TiO 2 、C 3 N 4 Photocatalytic materials, such as non-toxic, high chemical stability, simple preparation and other advantages, have become a research hotspot in the field of photocatalysis. However, TiO alone 2 、C 3 N 4 There are two key scientific problems of low solar energy utilization rate and low quantum efficien...

Claims

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Application Information

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IPC IPC(8): B01J23/68C02F1/30C02F101/30
CPCB01J23/681C02F1/30C02F2101/308B01J35/39
Inventor 刘湘赵晗朱洁莲尹金慧张倩夏咏梅王海军
Owner JIANGNAN UNIV
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