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A kind of bismuth oxide/defective bismuth iodide composite material, preparation method and application thereof

A composite material, bismuth iodide technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, oxidized water/sewage treatment, etc., can solve the problem of low photocatalytic activity, low separation efficiency, difficult Activation of persulfate and other problems, to achieve the effect of high degradation efficiency, simple preparation process, and improved photocatalytic performance

Active Publication Date: 2022-04-05
XIAN UNIV OF SCI & TECH
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Problems solved by technology

[0007] The object of the present invention is to provide a kind of bismuth oxide / defect iodine oxybismuth composite material, preparation method and application thereof, in order to overcome above-mentioned prior art due to pure Bi 2 o 3 The photogenerated electron-hole pair separation efficiency is low, showing low photocatalytic activity, and it is difficult to activate the problem of persulfate

Method used

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  • A kind of bismuth oxide/defective bismuth iodide composite material, preparation method and application thereof
  • A kind of bismuth oxide/defective bismuth iodide composite material, preparation method and application thereof
  • A kind of bismuth oxide/defective bismuth iodide composite material, preparation method and application thereof

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preparation example Construction

[0048] The invention provides a preparation method of bismuth oxide / deficient iodine oxybismuth composite material, the preparation method comprising the following steps:

[0049] Step S1: Bi(NO 3 ) 3 ·5H 2 O dissolved in HNO 3 solution, and then add lye to adjust the pH to neutral, heat and stir for a period of time to obtain a mixed solution.

[0050] In a specific embodiment of the present invention, in step S1 Bi(NO 3 ) 3 ·5H 2 O and HNO 3 The molar ratio is 1:(10~20) (such as 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1 :19, 1:20), HNO 3 The concentration of the solution is 2mol / L.

[0051] In a specific embodiment of the present invention, the heating temperature in step S1 is 80-85°C (such as 80°C, 81°C, 82°C, 83°C, 84°C, 85°C), and the stirring time is 30-60min (such as 30min , 35min, 40min, 45min, 50min, 55min, 60min).

[0052] Step S2: Transfer the mixed solution obtained in step S1 to an autoclave for reaction, then cool to room temperature, wa...

Embodiment 1

[0067] This embodiment provides a preparation method of bismuth oxide / deficient iodine oxybismuth composite material, comprising the following steps:

[0068] Step S1: 1.94g (4mmol) Bi(NO 3 ) 3 ·5H 2 O dissolved in 2mol / L HNO 3 solution (26 mL), and then added NaOH (2.8 g) to adjust the pH to neutral, and stirred at 80° C. for 30 min to obtain a mixed solution 1.

[0069] Step S2: Transfer the mixed solution obtained in Step S1 to an autoclave, react at 200° C. for 10 h, then cool to room temperature, wash and dry to obtain Bi 2 o 3 powder.

[0070] Step S3: 0.486g (1mmol) Bi(NO 3 ) 3 ·5H 2 O and the 1.095g Bi obtained in step S2 2 o 3 Add the powder into a mixed solution of 19.5 mL of water and 19.5 mL of ethylene glycol, stir at room temperature for 1 h to dissolve, then add 2 mol / L KI solution (1 mL) dropwise, and continue stirring for 30 min to obtain a mixed solution 2.

[0071] Step S4: Transfer the mixed liquid 2 obtained in step S3 to a hydrothermal reaction...

Embodiment 2

[0079] This embodiment provides a method for preparing a bismuth oxide / deficient iodine oxybismuth composite material. The difference between this preparation method and Example 1 is that in step S3, Bi 2 o 3 The amount of powder is 0.200g, and other steps and methods are the same as in Example 1, and will not be repeated here.

[0080] Bismuth oxide (Bi 2 o 3 ) and defective bismuth oxyiodide (BiO 1.4 I 0.3 ) in a molar ratio of 3:7.

[0081] Add the bismuth oxide / deficient bismuth iodine oxybismuth composite material prepared in this example with a molar ratio of 3:7 into the water polluted by propranolol, and then add 0.4mmol / L persulfate to the water body, the results show , under visible light, the bismuth oxide / deficient bismuth oxyiodide composite with a molar ratio of 3:7 has a significant effect on the degradation of propranolol in water.

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Abstract

The invention provides a bismuth oxide / deficient iodine oxybismuth composite material, a preparation method and application thereof, the preparation method is firstly preparing Bi 2 o 3 , then Bi(NO 3 ) 3 ·5H 2 O and Bi 2 o 3 Dissolve in water and ethylene glycol, add water-soluble iodine salt and stir, then transfer to a hydrothermal reactor for reaction, cool to room temperature, wash, dry, grind and sieve, and finally calcined to obtain bismuth oxide / defective bismuth iodine oxybismuth composite material. The bismuth oxide / deficient iodine oxybismuth composite material of the invention is used for degrading propranolol in water. The preparation method of the present invention is simple, the conditions are mild, and the price is low, and the prepared Bi 2 o 3 / BiO 1.4 I 0.3 The composite material has a wide range of light absorption, which significantly improves the separation of photogenerated carriers, greatly improves the photocatalytic performance, and can realize the rapid and effective degradation of propranolol in water, the degradation rate and maximum adsorption of propranolol The amount is much higher than that of bismuth oxide and bismuth oxyiodide.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic semiconductor materials, and in particular relates to a bismuth oxide / deficient iodine oxybismuth composite material, a preparation method and an application thereof. Background technique [0002] With the rapid development of the current economy and society, human activities have caused amazing damage to the environment, which seriously threatens the sustainable development of human society. Among them, due to the importance and irreplaceability of water resources, water pollution has become an urgent need One of the environmental problems to be solved. So far, many methods have been developed to treat wastewater. However, due to the complex composition and different physical and chemical properties of pollutants, these traditional technologies still have some limitations. Therefore, it is highly desirable to have high efficiency, low energy consumption and environmental protection Friend...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/06B01J23/18C02F1/30C02F1/72C02F101/34C02F101/38
CPCB01J27/06B01J23/18C02F1/30C02F1/722C02F1/725C02F2101/34C02F2101/38C02F2305/10B01J35/39
Inventor 邓月华车前前任涛涛李娅妮高翔
Owner XIAN UNIV OF SCI & TECH
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