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Preparation method and application of silver iodide/bismuth oxybromide heterojunction photocatalyst

A photocatalyst and heterojunction technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high excitation energy, low photocatalytic activity, anesthesia, etc., and achieve saving The effect of synthesis cost, cheap and easy-to-obtain raw materials, and effective control of morphology

Inactive Publication Date: 2018-10-09
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, a single BiOBr still has the following problems: the band gap is as large as 2.75eV (the required excitation energy is high); the photogenerated electrons and holes are easy to recombine, resulting in low quantum efficiency; the photocatalytic activity is low, these defects restrict its practical application in the environment
[0010] 1. The temperature required in the reaction process or calcination process is high, the synthesis time is long, the energy consumption is high, and the synthesis cost is increased;
[0011] 2. The organic solvent (methanol) used in the existing preparation process is toxic, has anesthesia effect, has a strong stimulating effect on the eyes, skin and respiratory system, and is harmful to the body if swallowed, inhaled or in contact with the skin;
[0012] 3. The prepared photocatalyst has low activity and cannot achieve efficient and rapid removal of organic pollutants;
[0013] 4. The crystal form of the prepared photocatalyst is poor, and the morphology is not effectively controlled, which makes its photocatalytic activity poor

Method used

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  • Preparation method and application of silver iodide/bismuth oxybromide heterojunction photocatalyst
  • Preparation method and application of silver iodide/bismuth oxybromide heterojunction photocatalyst
  • Preparation method and application of silver iodide/bismuth oxybromide heterojunction photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Dissolve 2 mmol of bismuth salt in 30 ml of ethylene glycol and stir magnetically for 30 min at room temperature;

[0049] (2) Dissolve 2 mmol of bromine source in 30 ml of ethylene glycol, stir magnetically at room temperature for 10 min, add dropwise to the above solution, and continue stirring for 1 h;

[0050] (3) Transfer the above mixed solution to a reaction kettle, put it in an oven at 145°C for 18 h, and obtain a milky white solid;

[0051] (4) The milky white solid was separated by centrifugation, washed three times with deionized water and absolute ethanol respectively, and dried in an oven at 60°C;

[0052] (5) Take out the dried solid and grind it with an agate mortar to obtain dry BiOBr powder;

[0053] (6) Dissolve 2 mmol of silver salt in 40 ml of deionized water and stir at room temperature for 15 min;

[0054] (7) Add the prepared BiOBr powder into the above solution and continue stirring for 15 min;

[0055] (8) Add 2 mmol iodine source dropwis...

Embodiment 2

[0059] (1) Dissolve 2 mmol of bismuth salt in 30 ml of ethylene glycol and stir magnetically for 30 min at room temperature;

[0060] (2) Dissolve 2 mmol of bromine source in 30 ml of ethylene glycol, stir magnetically at room temperature for 10 min, add dropwise to the above solution, and continue stirring for 1 h;

[0061] (3) Transfer the above mixed solution to a reaction kettle, put it in an oven at 125°C for 18 h, and obtain a milky white solid;

[0062] (4) The milky white solid was separated by centrifugation, washed three times with deionized water and absolute ethanol respectively, and dried in an oven at 60°C;

[0063] (5) Take out the dried solid and grind it with an agate mortar to obtain dry BiOBr powder;

[0064] (6) Dissolve 2 mmol of silver salt in 40 ml of deionized water and stir at room temperature for 15 min;

[0065] (7) Add the prepared BiOBr powder into the above solution and continue stirring for 15 min;

[0066] (8) Add 2 mmol iodine source dropwis...

Embodiment 3

[0070] (1) Dissolve 2 mmol of bismuth salt in 30 ml of ethylene glycol and stir magnetically for 30 min at room temperature;

[0071] (2) Dissolve 2 mmol of bromine source in 30 ml of ethylene glycol, stir magnetically at room temperature for 10 min, add dropwise to the above solution, and continue stirring for 1 h;

[0072] (3) Transfer the above mixed solution to a reaction kettle, put it in an oven at 165°C and react for 18 hours to obtain a milky white solid;

[0073] (4) The milky white solid was separated by centrifugation, washed three times with deionized water and absolute ethanol respectively, and dried in an oven at 60°C;

[0074] (5) Take out the dried solid and grind it with an agate mortar to obtain dry BiOBr powder;

[0075] (6) Dissolve 2 mmol of silver salt in 40 ml of deionized water and stir at room temperature for 15 min;

[0076] (7) Add the prepared BiOBr powder into the above solution and continue stirring for 15 min;

[0077] (8) Add 2 mmol iodine so...

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Abstract

The invention provides a preparation method and application of an AgI / BiOBr heterojunction photocatalyst. The method comprises the following steps that firstly, a bismuth salt substance and a brominesource substance are dissolved in ethylene glycol respectively, and the two solutions are mixed and are stirred for 1 h; a mixed solution is transferred into a reaction kettle and reacts at 125-185 DEG C for 14-22 h so as to obtain a milk white solid; the milk white solid is washed, dried and ground so as to obtain dried BiOBr powder; silver salt is dissolved in 40 ml of deionized water, the prepared BiOBr powder is added into the solution, an iodine source is dropwise added into the solution, and stirring is carried out for 60 minutes so as to obtain a yellow precipitate; and the yellow precipitate is washed, dried and ground, and obtained yellow powder is the AgI / BiOBr heterojunction photocatalyst. The AgI / BiOBr heterojunction photocatalyst prepared through the method is used for degrading organic pollutants in water; and compared with photocatalysts such as commercial TiO2 (P25), pure-phase AgI and pure-phase BiOBr, the photocatalyst has higher visible-light catalytic activity.

Description

technical field [0001] The invention belongs to the field of semiconductor photocatalysis, and in particular relates to a preparation method and application of a silver iodide / bismuth oxybromide heterojunction photocatalyst. Background technique [0002] Environmental endocrine disrupting chemicals (Endocrine Disrupting Chemicals, EDCs) refer to a class of exogenous chemical substances that can maintain their own balance in organisms and regulate the synthesis, secretion, transport, reaction and metabolism of natural hormones in the development process. Normal functioning of the reproductive system, nervous system, cardiovascular, metabolic and immune systems. EDCs include natural and synthetic compounds, natural ones such as phytoestrogens and natural estrogens, and synthetic ones including some pharmaceutical preparations, pesticides and various industrial chemicals. Part of the EDCs in the environment comes from the secretions of humans, animals, and plants, and the rest...

Claims

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Application Information

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IPC IPC(8): B01J27/08B01J35/08C02F1/30C02F101/34C02F101/38
CPCC02F1/30B01J27/08C02F2305/10C02F2101/345C02F2101/34C02F2101/38C02F2101/40B01J35/39B01J35/51
Inventor 蒋峰芝李领鑫龙艳菊陈宇王珊张思凤王路路
Owner YUNNAN UNIV
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