Preparation method of bismuth oxyhalide/bismuth oxide visible-light photocatalyst

A photocatalyst and bismuth oxyhalide technology, which is applied in the field of visible light photocatalyst preparation, can solve the problems of high photo-generated carrier recombination rate, low catalytic efficiency, reduced photo-generated carrier recombination rate, etc. Simplicity and the effect of reducing the recombination rate of photogenerated carriers

Inactive Publication Date: 2015-04-22
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at the problems of low catalytic efficiency of a single catalyst and high recombination rate of photogenerated carriers, the present invention provides a simple and efficient preparation method of bismuth oxyhalide / bismuth oxide visible light photocatalyst, a new bismuth oxyhalide / bismuth oxide material It has the advantages of no pollution to the environment, simple synthesis and low cost, and can significantly reduce the recombination rate of photogenerated carriers and improve photocatalytic performance

Method used

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  • Preparation method of bismuth oxyhalide/bismuth oxide visible-light photocatalyst

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Embodiment 1

[0027] (1) Weigh a certain amount of Bi(NO 3 ) 3 ·5H 2 O is put into the polytetrafluoroethylene liner liner that fills 75ml ethylene glycol, puts in a certain amount of KCl after stirring for 0.5h with a magnetic stirrer, moves in the autoclave after stirring again for 0.5h, is placed in the oven, set After reacting at a fixed temperature for a period of time, cool naturally to room temperature, collect the product by suction filtration, wash alternately with deionized water and absolute ethanol three times, and dry in an oven at 100°C for 2 hours to obtain the off-white product BiOCl.

[0028] (2) Weigh Bi(NO 3 ) 3 ·5H 2 O and KBr, Bi(NO 3 ) 3 ·5H 2O is put into the polytetrafluoroethylene reaction liner that fills 75ml ethylene glycol, after stirring for 0.5h with a magnetic stirrer, KBr is added, and then moved into a high-temperature reactor after stirring for 0.5h, placed in an oven, at a set temperature Heated at constant temperature for a certain period of time...

Embodiment 2

[0033] (1) Dissolve 10mmol bismuth nitrate in 40mL, 4mol / L nitric acid solution, stir well until dissolved, adjust the pH to 7 with 100mL, 1.9mol / L sodium hydroxide solution, stir magnetically at room temperature for 1.2 hours, filter, Washed three times with absolute ethanol and distilled water, dried the product at 50°C for 10 hours, and then calcined at 300°C for 10 hours to obtain yellow bismuth oxide.

[0034] (2) Add 0.0143mL of 37% hydrochloric acid to 0.4g of the prepared bismuth oxide, the molar ratio of hydrochloric acid to bismuth oxide is 0.1:1, ultrasonic reaction for 0.5 hours, and then centrifuged for 1 hour (rotation speed is 4000r / min), and then dried at a constant temperature of 50 °C for 10 hours to prepare a bismuth oxychloride / bismuth oxide photocatalyst, marked as (0.1BiOCl / Bi 2 o 3 ).

[0035] Composite photocatalyst 0.1BiOCl / Bi prepared by taking the degradation of rhodamine B as a model reaction 2 o 3 Photocatalytic activity: 0.05g catalyst 0.1BiO...

Embodiment 3

[0037] (1) Dissolve 10mmol bismuth nitrate in 40mL, 4mol / L nitric acid solution, stir well until dissolved, adjust the pH to 7 with 100mL, 1.9mol / L sodium hydroxide solution, stir magnetically at room temperature for 2 hours, filter, Wash with absolute ethanol and distilled water for 5 times, dry the product at 100°C for 7 hours, and then calcinate at 600°C for 3 hours to obtain yellow bismuth oxide.

[0038] (2) Add 0.043mL of 37% hydrochloric acid to 0.4g of prepared bismuth oxide, the molar ratio of hydrochloric acid to bismuth oxide is 0.3:1, ultrasonic reaction for 2 hours, then centrifuged for 2 hours (4000r / min), and then dried at a constant temperature of 100 °C for 4 hours to prepare a bismuth oxychloride / bismuth oxide photocatalyst, marked as (0.3BiOCl / Bi 2 o 3 ), the scanning electron microscope image is shown in Figure 4 (b), with Figure 4 (a) Comparison will find that Bi 2 o 3 surface will become rough.

[0039] Composite photocatalyst 0.3BiOCl / Bi prepare...

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Abstract

The invention relates to a preparation method of a bismuth oxyhalide/bismuth oxide visible-light photocatalyst and belongs to the field of visible-light photocatalyst preparation. The method comprises the following steps: dissolving bismuth nitrate in a salpeter solution, adjusting pH with alkali lye, stirring, filtering, washing, drying, calcining at high temperature of 300-600 DEG C for 3-10 hours to prepare yellow bismuth oxide; adding a proper amount of hydrochloric acid, hydrobromic acid or hydroiodic acid with a certain concentration into the prepared bismuth oxide, carrying out an ultrasonic reaction, carrying out centrifugal separation, and drying at constant temperature of 50-100 DEG C for 4-10 hours to obtain the bismuth oxyhalide/bismuth oxide photocatalyst. The method can be carried out at room temperature and at normal pressure. Equipment is simple and easy to operate, can be put into practical use and has a potential application in industrial production. According to the prepared bismuth oxyhalide/bismuth oxide visible-light photocatalyst, the problem of high photo-generated electron and carrier recombination rate is solved effectively, and photocatalytic performance is greatly enhanced.

Description

technical field [0001] The invention relates to a preparation method of a bismuth oxyhalide / bismuth oxide visible light photocatalyst, belonging to the field of visible light photocatalyst preparation. Background technique [0002] With the rapid development of society and economy and the rapid expansion of population, the demand for energy in human society has increased significantly, and global environmental problems have become increasingly prominent. Various toxic / hazardous pollutants are continuously accumulated, migrated and transformed in the air, soil and water environment, seriously destroying the ecological balance and endangering human life and health. Therefore, the effective control and governance of environmental pollution is one of the key issues related to whether human society can continue to survive and develop. In order to solve the two century-old problems of energy crisis and environmental pollution at the same time, we must find a non-polluting and eco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06A62D3/17A62D101/26A62D101/28
Inventor 伍水生王军贾庆明赵文波王亚明
Owner KUNMING UNIV OF SCI & TECH
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