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A method and application of regulating the photocatalytic activity of oxide materials with aurivillius structure

A photocatalytic activity, oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as loose layered structure, and achieve improved separation. Ability, photocatalytic activity improvement, and the effect of simple synthesis process

Active Publication Date: 2021-01-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] By adjusting the polarity in the reaction environment to control the dehydration of the oxygen polyhedron to achieve the adjustment of the oxide crystal growth behavior, in the study of the preparation of monolithic metal oxides (such as titanium dioxide, zinc oxide, etc.) [J.A.Zhu et al.Crystengcomm 12( 2010); Zhang Xuehua et al., Chinese Science (Series E) 34 (2004)], has been a relatively widely used technical means, but for the Aurivillius-type material with binary metal oxides, the main purpose of adjusting the reaction environment is to Adjust the proportion of each phase and the particle size of the oxide, but because the Aurivillius type binary metal oxide crystal has a loose layered structure, the layers are directly combined by van der Waals force, and the adjustment of the polarity of the reaction environment affects the formation of the oxygen polyhedron. Dehydration will inevitably lead to electrostatic attraction between the layers of the crystal structure, which will lead to changes in the crystal constants of this type of oxide, which is not easy to think of in this direction of research

Method used

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  • A method and application of regulating the photocatalytic activity of oxide materials with aurivillius structure
  • A method and application of regulating the photocatalytic activity of oxide materials with aurivillius structure
  • A method and application of regulating the photocatalytic activity of oxide materials with aurivillius structure

Examples

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Embodiment 1

[0051] This example is the preparation of a novel layered bismuth molybdate photocatalyst material in an alcohol-thermal system under alkaline conditions. The specific process is as follows:

[0052] 1) Configure the reaction precursor:

[0053] First, the configuration concentration is 0.37mol / L lye (ethanol solution of NaOH); secondly, bismuth nitrate pentahydrate is dissolved in ethylene glycol to obtain a concentration of bismuth salt solution of 0.6mol / L, and sodium molybdate dihydrate Dissolved in ethylene glycol to obtain a 0.3mol / L molybdate solution; mix the two salt solutions at a ratio of 1:1 according to the Bi:Mo molar ratio to obtain a mixed ethylene glycol solution; then, the prepared ethanol lye Add it dropwise into the ethylene glycol solution containing Bi and Mo under the condition of continuous stirring; finally, stop stirring after fully mixing to obtain the precursor.

[0054] (2) alcohol heat reaction:

[0055] The precursor obtained in step (1) was in...

Embodiment 2

[0065] This example is the preparation of a novel layered bismuth tungstate photocatalytic material in an alcohol-thermal system under alkaline conditions. The specific process is as follows:

[0066] 1) Configure the reaction precursor:

[0067] First, configure the lye (NaOH ethanol solution) with a concentration of 0.37mol / L; secondly, dissolve bismuth nitrate pentahydrate in ethylene glycol to obtain a bismuth salt solution with a concentration of 0.6mol / L, and dihydrate sodium tungstate Dissolve in ethylene glycol to obtain a 0.3mol / L tungstate solution; mix the two salt solutions according to the Bi:W molar ratio of 1:1 to obtain a mixed ethylene glycol solution; then, the prepared ethanol lye Add dropwise into the ethylene glycol solution containing Bi and W under the condition of continuous stirring; finally, stop stirring after fully mixing to obtain the precursor.

[0068] (2) alcohol heat reaction:

[0069] The precursor obtained in step (1) was incubated and reac...

Embodiment 3

[0072] This embodiment is the application of the photocatalytic degradation of rhodamine B (RhB) of the layered structure bismuth molybdate or bismuth tungstate photocatalytic material and P25 prepared by comparative example 1-2 or embodiment 1-2, and the process is as follows:

[0073] 1) Ultrasonic disperse 50 mg of the powder obtained in Comparative Example 1-2 or Example 1-2 or P25 in 50 mL of rhodamine B (RhB)=5 ppm aqueous solution to obtain a suspension. Move the suspension into a photocatalytic reactor and place it on a magnetic stirrer to stir for 30 minutes in the dark, place it under a 300W xenon light source to irradiate the suspension with light, the wavelength of the light source is the visible spectrum, and the intensity is 45mW / cm 2 , light for 40 minutes.

[0074] 2) Take 4mL of the suspension at regular intervals and centrifuge to separate the nanopowder, and take the supernatant to measure the remaining rhodamine B (RhB) concentration in the solution.

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Abstract

The invention discloses a method for regulating and controlling the photocatalytic activity of an Aurivillius-structure oxide material and application of the Aurivillius-structure oxide material, andbelongs to the technical field of inorganic non-metallic nanomaterial preparation, solar energy utilization and environmental protection. According to the method, through regulation of a dipole momentof Aurivillius-structure oxide crystal, a photogenerated electron and hole separation behavior of the material under a light irradiation condition is changed, so that regulation and control of the photocatalytic activity of the Aurivillius-structure oxide material are achieved; through design of a wet chemical synthesis technology, the dipole moment of Aurivillius-structure oxide can be regulatedon the premise that phase composition and components are not changed, so that the photocatalytic activity of the material is improved. The prepared Aurivillius-type oxide material is directly appliedto photocatalytic degradation and purification of organic dyes, aromatic organic matters and antibiotics in water or microorganisms in water under the light irradiation condition.

Description

technical field [0001] The invention relates to the technical fields of preparation of inorganic non-metal nanomaterials, solar energy utilization and environmental protection, in particular to a method for regulating and controlling the catalytic activity of an oxide material with an Aurivillius structure and its application. The material is used in the field of water purification. Background technique [0002] Photocatalytic technology has attracted extensive attention from scientific and technological workers because of its broad application prospects in the fields of solar energy utilization and environmental restoration. Starting from the basic process of photocatalytic reaction, the photocatalytic process can be divided into three major steps, namely light energy absorption, separation of photogenerated electron-hole pairs, and surface reaction. The separation efficiency of photogenerated electrons and holes directly affects the photocatalytic activity of materials. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/16C02F1/30
CPCB01J23/16B01J35/004C02F1/30C02F2305/10
Inventor 李琦杨炜沂陈彦
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI