Preparation method of cesium lead bromide quantum dot/carbon nitride nanosheet photocatalyst

A lead cesium bromide quantum and photocatalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of easy recombination and poor stability of photogenerated electrons and holes, and achieve the preparation method Simple, good stability, the effect of overcoming instability and loss of catalytic activity

Active Publication Date: 2019-09-13
CHINA JILIANG UNIV
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Problems solved by technology

[0005] Aiming at the problem of poor stability in water of single lead cesium bromide quantum dots and easy recombination of photogenerated elec

Method used

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  • Preparation method of cesium lead bromide quantum dot/carbon nitride nanosheet photocatalyst
  • Preparation method of cesium lead bromide quantum dot/carbon nitride nanosheet photocatalyst
  • Preparation method of cesium lead bromide quantum dot/carbon nitride nanosheet photocatalyst

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specific Embodiment approach 1

[0019] Specific embodiment one: This embodiment is the simple preparation of lead cesium bromide quantum dot / graphite phase carbon nitride nanosheet photocatalytic material, and the specific steps are as follows:

[0020] 1) Add 2.5 mmol of cesium carbonate to a three-necked flask containing 10.0 ml of 1-octadecene and 2.5 ml of oleic acid, and place in an oil bath at 120° C. for 1 h. Then, at N 2 The mixture was heated to 150 °C under atmosphere until the complete reaction between cesium carbonate and oleic acid to form a precursor solution. Add 2.0 mmol of lead bromide to a flask containing 10.0 ml of N,N-dimethylformamide, 4.0 mmol of hexanoic acid and 4.0 mmol of octylamine, stir the mixture until the lead bromide is dissolved, then add 2.5 ml of the above-prepared The precursor solution was stirred for 5 h, and finally the mixture was dispersed in 100 ml of toluene solution. Use ethanol as an anti-solvent, and add it into the above toluene solution at a volume ratio of ...

specific Embodiment 2

[0023] Specific embodiment 2: the difference between this embodiment and specific embodiment 1 is that the quality of lead cesium bromide quantum dots in step 4 is 0.05g, and the others are the same as specific embodiment 1.

specific Embodiment 3

[0024]Specific embodiment three: the difference between this embodiment and specific embodiment one is that the mass of lead cesium bromide quantum dots in step four is 0.10g, and the others are the same as specific embodiment one.

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Abstract

The invention discloses a preparation method of a cesium lead bromide quantum dot/carbon nitride nanosheet photocatalyst. The preparation method comprises the following steps: 1, preparing cesium leadbromide quantum dots by an anti-solvent process; 2, preparing a bulk phase graphite phase carbon nitride powder through recrystallization and thermal polycondensation of polyurea; and 3, adding the cesium lead bromide quantum dots while ultrasonically stripping the bulk phase graphite phase carbon nitride to prepare the cesium lead bromide quantum dot/carbon nitride nanosheet photocatalyst material in one step. The cesium lead bromide quantum dot/carbon nitride nanosheet photocatalyst is prepared by simple one-step ultrasonication, and the obtained composite photocatalyst material has good water stability, and overcomes the defect of instability the cesium lead bromide quantum dots in water. The composite photocatalyst improves the utilization rate of visible lights and inhibits the recombination of photogenerated electrons and holes, so the composite photocatalyst can efficiently photocatalyze the degradation of tetracycline hydrochloride in water under the irradiation of visible light.

Description

technical field [0001] The invention relates to a preparation method of lead cesium bromide quantum dot / carbon nitride nanosheet photocatalyst, which belongs to the technical field of photocatalytic environment-friendly nanomaterials. Background technique [0002] Discovered since 2009 (CH) 3 (NH) 3 PbBr 3 and (CH) 3 (NH) 3 PB 3 Since they can be used as visible photosensitizers for photovoltaic cells, organic and inorganic halide perovskites have attracted the attention of researchers (Acs Nano, 2014, 8(10):9815-21; Applied Physics Letters, 2015, 107(23): 506-514). However, the poor stability of organic and inorganic halide perovskites limits their applications. Relatively stable all-inorganic perovskites have received more attention in the field of solar energy conversion, which have a series of excellent optoelectronic properties, such as high absorption coefficient, wide absorption range, direct and tunable bandgap, simple bandgap engineering and processing. Low ...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCB01J27/24B01J35/004C02F1/30C02F2101/38
Inventor 陈智钱笑笑魏其艳
Owner CHINA JILIANG UNIV
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