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Metal oxide and halide perovskite quantum dot heterojunction visible-light-driven photocatalyst as well as preparation method and application thereof

A halide perovskite and oxide technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve problems such as limiting the use of visible light, achieve good visible light catalytic performance, mild reaction conditions, improve The effect of removal efficiency

Active Publication Date: 2021-08-20
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

However, SnO 2 There are still deficiencies, its too wide bandgap (about 3.5eV) leads to SnO 2 (λ<420nm) can only respond to the energy of ultraviolet light in the solar spectrum, limiting its response to visible light (420nm

Method used

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  • Metal oxide and halide perovskite quantum dot heterojunction visible-light-driven photocatalyst as well as preparation method and application thereof
  • Metal oxide and halide perovskite quantum dot heterojunction visible-light-driven photocatalyst as well as preparation method and application thereof
  • Metal oxide and halide perovskite quantum dot heterojunction visible-light-driven photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0034] Please refer to the attached figure 1 , the SnO provided by the embodiment of the present invention 2 / Cs 3 Bi 2 I 9 The preparation method of the heterojunction visible light catalyst comprises the following steps:

[0035] Step1: Prepare the tin tetrachloride pentahydrate solution and the sodium hydroxide solution respectively, slowly drop the sodium hydroxide solution into the tin tetrachloride pentahydrate solution and stir until clarification, then add absolute ethanol dropwise and stir; subsequently, the mixed solution is In a high-pressure reactor, heat the reaction at 120-200°C for 12-48h, wash with water and ethanol in sequence after cooling, and finally dry at 60°C to obtain solid SnO 2 and ground to a solid powder;

[0036] Step2: Add cesium iodide and bismuth iodide to N,N-dimethylformamide; and at room temperature, ultrasonic power is 80KHZ, ultrasonic 10-60min to obtain a clear precursor solution; then add React in liquid toluene for 1-30min, then ce...

Embodiment 1

[0040] Pure phase SnO 2 Preparation: First, prepare 25ml solutions of tin tetrachloride pentahydrate and sodium hydroxide respectively, wherein the concentration of tin tetrachloride pentahydrate is 0.2 mmol / ml, the concentration of sodium hydroxide is 1 mmol / ml, and the concentration of tin tetrachloride pentahydrate is 1 mmol / ml. , sodium hydroxide, and dehydrated ethanol are 5mmol: 25mmol: 429mmol, the sodium hydroxide solution is slowly dripped into the tin tetrachloride pentahydrate solution and stirred until clarified, then added dropwise with dehydrated ethanol and stirred; subsequently, The mixed solution was heated and reacted at 180°C for 24 hours in a high-pressure reactor, washed with water and ethanol in sequence after cooling, and finally dried at 60°C to obtain solid SnO 2 and ground to a solid powder to obtain SnO 2 powder.

Embodiment 2

[0042] Pure phase Cs 3 Bi 2 I 9 Preparation: Add 0.9mmol cesium iodide and 0.6mmol bismuth iodide to 500ml of N,N-dimethylformamide; and at room temperature, ultrasonic power is 80KHZ, ultrasonic 30min to obtain a clear precursor solution; Then the precursor solution was added to liquid toluene to react for 5 min, then centrifuged and dried in a vacuum oven at 60 °C to obtain Cs 3 Bi 2 I 9 solid and ground to a solid powder to give Cs 3 Bi 2 I 9 powder;

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Abstract

The invention discloses a preparation method of a metal oxide SnO2 and halide perovskite quantum dot Cs3Bi2I9 heterojunction visible-light-driven photocatalyst, which comprises the following steps of (1) preparing a tin tetrachloride pentahydrate solution and a sodium hydroxide solution, dropwise adding the sodium hydroxide solution into the tin tetrachloride pentahydrate solution, stirring, dropwise adding absolute ethyl alcohol, stirring, heating, reacting, then washing, drying and grinding, (2) adding cesium iodide and bismuth iodide into N, N-dimethylformamide, and performing ultrasonic treatment to obtain a precursor solution, then adding the solution into toluene for reaction, and then centrifuging, drying and grinding, and (3) adding the two kinds of powder into isopropanol liquid for ultrasonic treatment, then stirring and centrifuging, drying and grinding to obtain the heterojunction visible-light-driven photocatalyst. The method for preparing the heterojunction photocatalyst is easy to operate, mild in reaction condition, low in equipment requirement and free of a complex synthesis device, and the catalyst is applied to nitrogen oxide degradation and can remarkably improve the nitrogen oxide removal efficiency.

Description

technical field [0001] The invention relates to the technical field of photocatalyst preparation, more specifically, to a metal oxide SnO 2 with halide perovskite quantum dots Cs 3 Bi 2 I 9 The heterojunction visible light catalyst, preparation method and application thereof. Background technique [0002] Nitrogen oxides (NO X ) is one of the main air pollutants and is extremely harmful to the environment. Even in the case of very low concentrations, it can cause serious air pollution problems, such as photochemical smog, acid rain, etc., thereby endangering the ecosystem and corroding buildings. As well as lead to diseases such as respiratory and cardiopulmonary diseases, causing widespread adverse effects on human health and the environment. With the progress of society and civilization and the improvement of public awareness of environmental protection, people's requirements for living environment are also getting higher and higher. Therefore, how to efficiently rem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135B01J27/08B01D53/86B01D53/56
CPCB01J27/135B01J27/08B01D53/8628B01D2255/802B01D2258/06B01D2257/404B01J35/39
Inventor 董帆袁潮苇侯喜锋盛剑平孙艳娟
Owner YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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