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Cs3Bi2Br9/TiO2 perovskite heterojunction and preparation method thereof, and application of Cs3Bi2Br9/TiO2 perovskite heterojunction in photocatalytic toluene oxidation

A photocatalytic oxidation and perovskite technology, applied in physical/chemical process catalysts, oxidation reaction preparation, chemical instruments and methods, etc., can solve the problems of easy decomposition of organic cations, poor environmental stability, etc., and achieve a simple and easy preparation method. Good operation and degradation effect

Pending Publication Date: 2021-02-02
SUZHOU UNIV
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Problems solved by technology

Recently, organic-inorganic hybrid bismuth-based perovskite MA 3 Bi 2 x 9 The synthesis of (Cl, Br, I) has been successful, however, the organic cations of organic-inorganic hybrid perovskites are easily decomposed, resulting in poor environmental stability compared with all-inorganic hybrid perovskites.

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  • Cs3Bi2Br9/TiO2 perovskite heterojunction and preparation method thereof, and application of Cs3Bi2Br9/TiO2 perovskite heterojunction in photocatalytic toluene oxidation
  • Cs3Bi2Br9/TiO2 perovskite heterojunction and preparation method thereof, and application of Cs3Bi2Br9/TiO2 perovskite heterojunction in photocatalytic toluene oxidation
  • Cs3Bi2Br9/TiO2 perovskite heterojunction and preparation method thereof, and application of Cs3Bi2Br9/TiO2 perovskite heterojunction in photocatalytic toluene oxidation

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Embodiment

[0038] Example Cs 3 Bi 2 Br 9 / TiO 2 The preparation of composite photocatalyst, specific steps are as follows:

[0039] With 15% Cs 3 Bi 2 Br 9 / TiO 2 For example, the composite photocatalyst synthesis method is:

[0040] (1) Weigh 576mg CsBr and 807mg BiBr 3 , both dissolved in 15ml of DMF to give CsBr and BiBr 3 solution;

[0041] (2) Weigh 600mg of TiO 2 Dispersed in isopropanol to give TiO 2 white dispersion;

[0042] (3) Under stirring at 2500rpm, take 1.185mL of CsBr and BiBr 3 solution was added dropwise to the above TiO 2 In the white dispersion liquid, continue to stir for 30 min after 10 minutes of dropwise addition, then use an ultracentrifuge to centrifuge the obtained liquid at 8000 rpm, and then put the collected solid in a vacuum drying oven at 80 degrees for 12 hours to obtain 15% Cs 3 Bi 2 Br 9 / TiO 2 .

[0043] Refer to the above 15% Cs 3 Bi 2 Br 9 / TiO 2 The preparation method, changing CsBr and BiBr 3 Solution dosage, get different ...

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Abstract

The invention discloses a Cs3Bi2Br9 / TiO2 perovskite heterojunction and a preparation method thereof, and an application of the Cs3Bi2Br9 / TiO2 perovskite heterojunction in photocatalytic toluene oxidation. The preparation method comprises the following steps: dropwise adding CsBr and BiBr3 solutions into a TiO2 dispersion liquid under stirring, then carrying out ultracentrifugation, and then dryinga solid to obtain the Cs3Bi2Br9 / TiO2 perovskite heterojunction. According to the invention, the Cs3Bi2Br9 / TiO2 perovskite heterojunction is added into toluene, illumination is carried out in the presence of oxygen, and benzyl alcohol is prepared, wherein the conversion rate exceeds 70%, and the selectivity is close to 100%.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials and relates to Cs 3 Bi 2 Br 9 / TiO 2 The preparation method of the composite material, and the role of the photocatalyst prepared by this method in the oxidation of benzyl alcohol. Background technique [0002] The stoichiometry is ABX due to unique optoelectronic and optoelectronic properties 3 halide perovskites have received increasing attention. With the deepening of solar energy research, more and more researchers began to explore the application of perovskite materials in other fields, such as high-gain photodetectors, light-emitting diodes and lasers. Due to the high extinction coefficient, optimal bandgap, low exciton binding energy and excellent charge transport properties of perovskite. Halide perovskite materials have also received extensive attention in the field of photocatalysis. However, there are still two major limitations in applying lead halide perovskite mate...

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Application Information

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IPC IPC(8): B01J27/138B01J35/00C02F1/30C07C29/50C07C33/22C02F101/30C02F101/38
CPCB01J27/138C07C29/50C02F1/30C02F2305/10C02F2101/38C02F2101/40B01J35/39C07C33/22
Inventor 路建美贺竞辉
Owner SUZHOU UNIV
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