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Bismuth subnitrate and bismuth oxy iodide composite light catalyst, preparation method thereof and application of composite light catalyst

A technology of bismuth nitrate and recombination of light, which is applied in the field of photocatalysis, can solve the problems of low photoresponse ability and poor photocatalytic activity, and achieve the effects of improving separation efficiency, reducing transmission impedance, and inhibiting the recombination of photogenerated electrons and holes

Active Publication Date: 2019-10-08
CHANGSHA UNIVERSITY
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Problems solved by technology

[0005] Carriers are easy to recombine for BiOI photocatalytic materials, B i6 o 6 (OH) 3 (NO 3 ) 3 1.5H 2 O photocatalytic materials have low visible light response ability and poor photocatalytic activity. The present invention proposes a composite photocatalyst for preparing basic bismuth nitrate and bismuth oxyiodide and its preparation method and application.

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  • Bismuth subnitrate and bismuth oxy iodide composite light catalyst, preparation method thereof and application of composite light catalyst
  • Bismuth subnitrate and bismuth oxy iodide composite light catalyst, preparation method thereof and application of composite light catalyst
  • Bismuth subnitrate and bismuth oxy iodide composite light catalyst, preparation method thereof and application of composite light catalyst

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preparation example Construction

[0028] This embodiment proposes a method for preparing a composite photocatalyst of bismuth subnitrate and bismuth oxyiodide, comprising the following steps:

[0029] 1) dispersing iodized salt and bismuth salt containing at least bismuth nitrate in water respectively to obtain said iodized salt solution and said bismuth salt solution;

[0030]2) According to the molar ratio of iodine salt to bismuth in bismuth salt containing at least bismuth nitrate 0.5-1.5:1, add iodine salt solution to bismuth salt solution to obtain a black mixed solution, stir the black mixed solution for 10-60min to a red mixed solution Wherein, the iodized salt is potassium iodide and / or sodium iodide, and the bismuth salt containing bismuth nitrate at least is a mixture of bismuth nitrate or bismuth nitrate and other bismuth sources; further, the described bismuth source is iodine bismuth oxide and / or bismuth oxide;

[0031] 3) Transfer the mixed liquid obtained in step 2) to the autoclave according ...

Embodiment 1

[0037] This embodiment prepares flake BiOI / Bi 6 o 6 (OH) 3 (NO 3 ) 3 1.5H 2 The method of O photocatalyst is mainly realized by the following steps:

[0038] 1) Add 4mmol Bi(NO 3 ) 3 ·5H 2 O and 4mmol KI were respectively dispersed in 30mL deionized water, and stirred for 20min, then the KI aqueous solution was added to the Bi(NO 3 ) 3 ·5H 2 O solution, stirred for 60min to obtain a red mixed solution; wherein, Bi(NO 3 ) 3 ·5H 2 O is dispersed in the solution in the form of a suspension;

[0039] 2) Transfer the mixed solution obtained in step 1) to the autoclave according to 60% of the volume of the autoclave, and conduct a hydrothermal reaction at 160° C. for 6 hours. After the reaction, cool and filter; After repeated washing with ethanol and drying, the flaky BiOI / Bi 6 o 6 (OH) 3 (NO 3 ) 3 1.5H 2 O composite photocatalyst.

[0040] from figure 1 It can be seen from the figure that after the hydrothermal reaction, a large amount of iodine element parti...

Embodiment 2

[0042] This embodiment prepares flake BiOI / Bi 6 o 6 (OH) 3 (NO 3 ) 3 1.5H 2 The method of O photocatalyst is mainly realized by the following steps:

[0043] 1) Add 2mmol Bi(NO 3 ) 3 ·5H 2 O and 2mmol KI were respectively dispersed in 20mL deionized water, and stirred for 40min, then the KI aqueous solution was added to the Bi(NO 3 ) 3 ·5H 2 O solution, stirred for 30min to obtain a red mixed solution; wherein, Bi(NO 3 ) 3 ·5H 2 O is dispersed in the solution in the form of a suspension;

[0044] 2) Transfer the mixed liquid obtained in step 1) to the autoclave according to 80% of the volume of the autoclave, and conduct a hydrothermal reaction at 180° C. for 3 hours. After the reaction, cool and filter; Wash with ethanol repeatedly and dry to obtain flake BiOI / Bi 6 o 6 (OH) 3 (NO 3 ) 3 1.5H 2 O composite photocatalyst.

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Abstract

The invention relates to a bismuth subnitrate and bismuth oxy iodide composite light catalyst, a preparation method thereof and an application of the composite light catalyst. The method includes thesteps: 1) adding iodide salt water solution into a bismuth salt water solution according to the mole ratio of iodide salt to bismuth in bismuth salt at least containing bismuth nitrate of (0.5-1.5):1,and stirring mixture to obtain mixed solution; 2) transferring the mixed solution acquired in the step 1) into a high-pressure reactor, and performing hydrothermal reaction for 2-20 hours at the temperature of 100-200 DEG C to obtain the BiOI / Bi6O6(OH)3(NO3)3*1.5H2O composite light catalyst. The invention further discloses a light catalyst prepared by the method and an application of the light catalyst. The method is simple, the light catalysis activity of the prepared composite light catalyst is improved, and the removing ratio of rhodamine B in water can reach 95% or more under visible light.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a composite photocatalyst of bismuth subnitrate and bismuth oxyiodide and its preparation method and application. Background technique [0002] The advantages of photocatalytic technology, such as strong oxidation, complete mineralization of organic pollutants, low cost, high efficiency, and no secondary pollution, make it widely used in many aspects of production and life. It is well known that semiconductor photocatalysts can generate photogenerated electron-hole pairs under light irradiation. The holes have strong oxidative properties and can degrade organic pollutants, thereby achieving the purpose of water purification. However, conventional titanium dioxide photocatalysts can only absorb ultraviolet light with a wide bandgap (λ<400nm), which greatly limits the application of photocatalysis under sunlight. Therefore, in order to make full use of cheap and clean so...

Claims

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Application Information

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IPC IPC(8): B01J27/25B01J37/10C02F1/30C02F101/30
CPCB01J27/25B01J37/10C02F1/30C02F2305/10C02F2101/308B01J35/39
Inventor 沈洁李中付张世英
Owner CHANGSHA UNIVERSITY
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