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Preparation method and application of bismuth oxyiodide/bismuth oxychloride heterojunction photocatalyst

A photocatalyst and heterojunction technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low photocatalytic activity, disadvantageous effective separation of photogenerated electrons and holes, and low quantum efficiency. and other problems, to achieve the effect of overcoming low photocatalytic activity, high visible light catalytic activity, and high photocatalytic activity

Inactive Publication Date: 2019-01-25
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the single BiOBr still has the following problems: the band gap is relatively large, about 2.75eV (the required excitation energy is high); the photogenerated electrons and holes are easy to recombine, resulting in low quantum efficiency, which is not conducive to the photogenerated electrons and holes. Effective separation; low photocatalytic activity, these defects restrict its practical application in the environment
[0012] 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;
[0013] 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;
[0014] 3. The prepared photocatalyst has low activity and cannot achieve efficient and rapid removal of organic pollutants

Method used

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  • Preparation method and application of bismuth oxyiodide/bismuth oxychloride heterojunction photocatalyst
  • Preparation method and application of bismuth oxyiodide/bismuth oxychloride heterojunction photocatalyst
  • Preparation method and application of bismuth oxyiodide/bismuth oxychloride heterojunction photocatalyst

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Experimental program
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Effect test

Embodiment 1

[0041] (1) Dissolve 4 mmol of bismuth salt in 10 ml of ethylene glycol + 30 ml of water, and stir magnetically for 30 min at room temperature;

[0042] (2) Dissolve 2 mmol of bromine source in 10 ml of ethylene glycol, stir magnetically at room temperature for 10 min, then add dropwise to the above solution, and continue stirring for 20 min;

[0043] (3) Dissolve 2 mmol of iodine source in 10 ml of ethylene glycol, stir magnetically at room temperature for 10 min, then add dropwise to the above solution, and continue stirring for 1 h;

[0044] (4) The yellow solid was separated by centrifugation, washed three times with deionized water and absolute ethanol respectively, and dried in an oven at 60°C;

[0045] (5) Take out the dried solid and grind it with an agate mortar to obtain dry BiOI / BiOBr powder.

[0046] 5 mg BiOI / BiOBr photocatalyst was added to the EE2 solution with a concentration of 3 mg / L, and after dark reaction for 30 min, the photocatalytic degradation was carr...

Embodiment 2

[0048] (1) Dissolve 4 mmol of bismuth salt in 10 ml of ethylene glycol + 60 ml of water, and stir magnetically for 30 min at room temperature;

[0049] (2) Dissolve 2 mmol of bromine source in 10 ml of ethylene glycol, stir magnetically at room temperature for 10 min, then add dropwise to the above solution, and continue stirring for 20 min;

[0050] (3) Dissolve 2 mmol of iodine source in 10 ml of ethylene glycol, stir magnetically at room temperature for 10 min, then add dropwise to the above solution, and continue stirring for 1 h;

[0051] (4) The yellow 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 BiOI / BiOBr powder.

[0053] 5 mg BiOI / BiOBr photocatalyst was added to the MO solution with a concentration of 3 mg / L, and after dark reaction for 30 min, the photocatalytic degradation was carri...

Embodiment 3

[0055] (1) Dissolve 4 mmol of bismuth salt in 20 ml of ethylene glycol + 30 ml of water, and stir magnetically for 30 min at room temperature;

[0056] (2) Dissolve 2 mmol of bromine source in 20 ml of ethylene glycol, stir magnetically at room temperature for 10 min, then add dropwise to the above solution, and continue stirring for 20 min;

[0057] (3) Dissolve 2 mmol of iodine source in 20 ml of ethylene glycol, stir magnetically at room temperature for 10 min, then add dropwise to the above solution, and continue stirring for 1 h;

[0058] (4) The yellow solid was separated by centrifugation, washed three times with deionized water and absolute ethanol respectively, and dried in an oven at 60°C;

[0059] (5) Take out the dried solid and grind it with an agate mortar to obtain dry BiOI / BiOBr powder.

[0060] 5 mg BiOI / BiOBr photocatalyst was added to the E2 solution with a concentration of 3 mg / L, and after dark reaction for 30 min, the photocatalytic degradation was carri...

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Abstract

The invention provides a preparation method and application of a bismuth oxyiodide(BiOI) / bismuth oxychloride(BiOBr) heterojunction photocatalyst. Firstly, bismuth salt substances are dissolved in a mixed solution of ethylene glycol and water, magnetic stirring is conducted for 30 min under room temperature; bromine source substances are dissolved in ethylene glycol, after magnetic stirring is conducted for 10 min under room temperature, slow dropwise adding into the solution is performed, and stirring is continued for 20 min; after magnetic stirring is conducted on bismuth source substances for 10 min under room temperature, slow dropwise adding into the mixed solution is performed, and stirring is continued for 1 h; yellow solid is subjected to centrifugal separation, deionized water andabsorlute ethyl alcohol are separately used for performing washing three times, and drying is performed in a drying oven at the temperature of 60 DEG C; the dried solid is taken out and ground with agate mortar, and finally the dried BiOI / BiOBr heterojunction photocatalyst is obtained. The prepared BiOI / BiOBr heterojunction photocatalyst is used for degrading organic pollutants in water, and the catalyst has higher visible-light catalytic activity compared with commercial TiO2(P25), pure-phase BiOI, pure-phase BiOBr and other photocatalysts.

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 bismuth oxyiodide / bismuth oxybromide heterojunction photocatalyst. Background technique [0002] Environmental endocrine disrupting chemicals (EDCs) refer to exogenous substances that can damage the function of the endocrine system and cause adverse health effects on organisms or their offspring. EDC S By interfering with the synthesis, secretion, transportation, metabolism and other processes of natural hormones in organisms, it will have adverse effects on the maintenance of homeostasis, reproduction, metabolism, development and behavior of organisms, and further affect the cardiovascular, nervous, immune and reproductive systems of organisms normal operation of the function. The sources of EDCs mainly include natural and synthetic chemical substances. Natural EDC S Phytoestrogens excreted from vertebrates inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J37/03C02F1/30C02F101/30C02F101/34C02F101/38
CPCC02F1/30B01J27/06B01J37/031C02F2305/10C02F2101/38C02F2101/40C02F2101/34C02F2101/345C02F2101/305C02F2101/308B01J35/39
Inventor 蒋峰芝李领鑫龙艳菊
Owner YUNNAN UNIV
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