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Bi2O3/(BiO)2CO3 heterojunction semiconductor photocatalyst and preparation method thereof

A photocatalyst and heterojunction technology, used in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve problems such as insufficient stability and poor photocatalytic performance, and achieve changes in charge transport methods and efficiency. , Improve the activity and stability, and promote the effect of separation

Active Publication Date: 2021-08-24
YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of poor photocatalytic performance and insufficient stability of most semiconductor photocatalysts at present, and provide a method that can improve photocatalytic stability and effectively reduce intermediate toxic by-product NO 2 Generated photocatalyst and preparation method thereof

Method used

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  • Bi2O3/(BiO)2CO3 heterojunction semiconductor photocatalyst and preparation method thereof
  • Bi2O3/(BiO)2CO3 heterojunction semiconductor photocatalyst and preparation method thereof
  • Bi2O3/(BiO)2CO3 heterojunction semiconductor photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0044] The difference between the preparation method of Example 2 and Example 1 is the S5 step:

[0045] S5. The mixture C was centrifuged to obtain the precursor powder, washed with ethanol and deionized water for 3 times, then dried at 80°C for 8 hours, and then calcined with air at 200°C for 2 hours in a muffle furnace, with a heating rate of 5°C / min, keep warm for 5 hours and then cool to room temperature to obtain a powder sample.

Embodiment 3

[0046] The difference between the preparation method of embodiment 3 and embodiment 1 is that step S5:

[0047] S5. Centrifuge the mixture C to obtain the precursor powder, then wash with ethanol and deionized water for 3 times, then dry at 80°C for 8 hours, and then use a muffle furnace to calcine in air at 350°C for 2 hours, and the heating rate is 5°C / min, keep warm for 5 hours and then cool to room temperature to obtain a powder sample.

Embodiment 1

[0070] In Example 10, after increasing the quality parameter of the surfactant, the addition of organic acid was reduced. The experimental data showed that the NO degradation efficiency of its product was different from that of Example 1, but it remained better overall; and In Example 11, the addition of surfactants was reduced, and after adjusting the composition of the organic acid and adding a sufficient amount of the organic acid, the resulting product still maintained a relatively good effect on the NO degradation efficiency.

[0071] At the same time, according to the lack of surfactant addition in Comparative Example 1, the product lacks a sufficient amount of carbon element during synthesis, resulting in only part of the material generating Bi 2 o 3 / (BiO) 2 CO 3 , driving its overall poor stability, the experimental results are consistent with the pure phase β-Bi 2 o 3 relatively close.

[0072] In summary, the present invention develops a kind of one-time effect...

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Abstract

The invention provides a Bi2O3 / (BiO)2CO3 heterojunction semiconductor photocatalyst and a preparation method thereof. Specifically, the prepared photocatalyst has a composite structure, can promote separation of photon-generated carriers, and can generate more active free radicals after reacting with water and oxygen molecules, so that pollutants NO and intermediate products are effectively activated, the reaction rate is increased, and the activity and stability of photocatalytic reaction are improved; the preparation cost of the photocatalyst in the scheme is low, so that the photocatalyst has wide application potential; in addition, a preparation method of one-step in-situ synthesis of the semiconductor heterojunction photocatalyst is adopted, and the heterojunction structure changes the light absorption range by changing the position of a valence conduction band, so that the charge transmission mode and efficiency are further changed, recombination of photon-generated carriers is reduced, and finally the purpose of improving the stability of photocatalytic performance is achieved. The method can effectively reduce the generation of intermediate toxic by-product NO2, and has the characteristics of mild reaction conditions and simple operation.

Description

technical field [0001] The invention relates to the technical field of photocatalyst preparation, in particular to a Bi 2 o 3 / (BiO) 2 CO 3 Heterojunction semiconductor photocatalyst and preparation method thereof. Background technique [0002] With the increasing environmental pollution and energy shortage, semiconductor photocatalysis, which uses light energy to efficiently remove various toxic and harmful substances in the environment, is regarded as an effective strategy to provide renewable energy and solve environmental problems. It shows broad application prospects in indoor air pollution control, but the photocatalytic efficiency and selectivity of most semiconductor photocatalysts are still unsatisfactory. The accumulation and other problems hinder the application of photocatalytic technology. Therefore, it is necessary to seek a method that can efficiently transfer carriers and suppress the intermediate toxic by-product NO 2 Semiconductor photocatalysts are u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/232B01D53/86B01D53/56
CPCB01J27/232B01D53/8628B01D2257/404B01D2255/802B01J35/39
Inventor 盛剑平王艳霞孙艳娟陈思董帆侯喜锋
Owner YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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