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Ag/BiOCl-OVs composite photocatalyst and preparation method and application thereof

A catalyst and composite light technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve effective degradation, good application prospects, and high degree of mineralization

Active Publication Date: 2020-07-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] So far, although there are many related reports on the loading of Ag on the surface of BiOCl, only the LSPR of Ag is mentioned in the reports, and the TSPR is not mentioned. There is no report of Ag deposition on the oxygen vacancies of BiOCl

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  • Ag/BiOCl-OVs composite photocatalyst and preparation method and application thereof
  • Ag/BiOCl-OVs composite photocatalyst and preparation method and application thereof
  • Ag/BiOCl-OVs composite photocatalyst and preparation method and application thereof

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preparation example Construction

[0042] The preparation method of Ag / (001) crystal plane BiOCl-OVs composite photocatalyst of the present invention specifically comprises the following steps:

[0043] Step 1: Bi(NO 3 ) 3 ·5H2 O and NaCl are dissolved in deionized water. Generally, 48 mL of deionized water is enough. After stirring at room temperature for 2 hours, the reaction precursor solution is obtained. Transfer the precursor solution to a hydrothermal reactor and react at 160°C for 18 hours. After cooling down to room temperature, take out the reaction kettle, let it stand to remove the supernatant, wash the precipitate with deionized water and absolute ethanol for 3 to 5 times, dry and grind at 70 to 90°C to obtain the oxygen vacancy-containing Exposed (001) crystal plane BiOCl powder, that is, BiOCl-OVs exposed (001) crystal plane;

[0044] Step 2: Dissolve the BiOCl-OVs powder obtained in step 1 in 45-65ml of deionized water, stir at room temperature for 30-35min to obtain aqueous solution A in the ...

Embodiment 1

[0053] Step 1: Mix 8mmol Bi(NO 3 ) 3 ·5H 2 0. Dissolve 8mmol NaCl in 48mL deionized water, stir at room temperature for 2 hours to obtain a reaction precursor, transfer the precursor to a hydrothermal reaction kettle, and react at 160°C for 18 hours. After the reaction is completed, the temperature drops to room temperature. Take it out, let it stand to remove the supernatant, wash the precipitate three times with deionized water and absolute ethanol respectively, dry and grind at 70°C to obtain the exposed (001) crystal plane BiOCl powder containing oxygen vacancies, namely (001) crystal plane BiOCl-OVs;

[0054] Step 2: Dissolve 0.3g (001) crystal plane BiOCl-OVs powder in 60mL water, stir at room temperature for 30min to obtain (001) crystal plane BiOCl-OVs aqueous solution A, and dissolve 0.015g Ag(NO 3 ) 3 Add to solution A to obtain mixed system A, place mixed system A in an XPA-3 photochemical reaction instrument for 2.5 hours to obtain a reaction solution, filter t...

Embodiment 2

[0056] Step 1: Mix 8mmol Bi(NO 3 ) 3 ·5H 2 0. Dissolve 8mmol NaCl in 48mL deionized water, stir at room temperature for 2 hours to obtain a reaction precursor, transfer the precursor to a hydrothermal reaction kettle, and react at 160°C for 18 hours. After the reaction is completed, the temperature drops to room temperature. Take it out, let it stand to remove the supernatant, wash the precipitate three times with deionized water and absolute ethanol respectively, dry and grind at 70°C to obtain the exposed (001) crystal plane BiOCl powder containing oxygen vacancies, namely (001) crystal plane BiOCl-OVs;

[0057] Step 2: Dissolve 0.3g (001) crystal plane BiOCl-OVs powder in 60mL water, stir at room temperature for 30min to obtain (001) crystal plane BiOCl-OVs aqueous solution A, and dissolve 0.03g Ag(NO 3 ) 3 Add to solution A to obtain mixed system A, place mixed system A in an XPA-3 photochemical reaction instrument for 2.5 hours to obtain a reaction solution, filter th...

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Abstract

The invention provides an Ag / BiOCl-OVs composite photocatalyst and a preparation method and application thereof. The method comprises the steps: step 1, dissovling BiOCl-OVs powder with exposed (001)crystal faces and Ag (NO3) 3 in deionized water according to the mass ratio of 1: (0.05-0.3), and obtaining a mixed system; step 2, carrying out a reduction reaction on the mixed system under a lightsource to obtain a reaction solution; and step 3, separating the product in the reaction solution, and drying to obtain the Ag / BiOCl-OVs composite photocatalyst. According to the preparation method, Ag < + > attached to oxygen vacancies is reduced into Ag by adopting an illumination reduction method, electrons of Ag can be transferred to BiOCl, the Fermi level of BiOCl is increased, and the reduction capability of photo-induced electrons is improved so that the composite photocatalyst can be used for effectively degrading an organic pollutant rhodamine B.

Description

technical field [0001] The invention belongs to the field of semiconductor photocatalytic functional materials, in particular to an Ag / BiOCl-OVs composite photocatalyst, a preparation method and application thereof. Background technique [0002] In recent years, due to the potential application of semiconductor photocatalysis technology in alleviating environmental pollution pressure and energy shortage, it has attracted extensive attention. [0003] BiOCl is a layered structure composed of bismuth oxide layer and chlorine atomic layer. Photogenerated electrons and holes are very easy to form excitons in the restricted layered structure, which makes the carrier separation in BiOCl not obvious and the photocatalytic performance is not ideal. . In order to promote the separation of excitons, oxygen vacancies can be introduced into the system. Oxygen vacancies can not only serve as defects to capture excitons, but also make the energy disorder of the system, and excitons tend ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/10C02F1/30C02F101/30
CPCB01J27/10C02F1/30C02F2305/10C02F2101/308B01J35/39Y02W10/37
Inventor 谈国强王勇张丹王敏党明月张碧鑫任慧君夏傲刘文龙
Owner SHAANXI UNIV OF SCI & TECH
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