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Preparation method and application for cadmium sulfide/bismuth oxyiodide heterojunction photo-catalyst

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 problem of high-efficiency and rapid removal of organic pollutants, low photocatalyst activity, and synthetic methods Complexity and other issues, to achieve the effects of reduced energy consumption, simple preparation process, and simple operation

Inactive Publication Date: 2017-11-21
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] 1. The synthesis method is complex and the production cost is high;
[0011] 2. The temperature required for the hydrothermal or solvothermal reaction process is high, the synthesis time is long, the energy consumption is high, and the synthesis cost is increased;
[0012] 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 for cadmium sulfide/bismuth oxyiodide heterojunction photo-catalyst
  • Preparation method and application for cadmium sulfide/bismuth oxyiodide heterojunction photo-catalyst
  • Preparation method and application for cadmium sulfide/bismuth oxyiodide heterojunction photo-catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0048] (1) Dissolve 2 mmol of bismuth salt in 35 ml of ethylene glycol and stir magnetically for 30 min at room temperature;

[0049] (2) Dissolve 2 mmol of iodine source in 35 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;

[0050] (3) Transfer the above mixed solution to a reaction kettle, and put it in an oven at 120°C for 12 h to obtain an orange-red solid;

[0051] (4) The orange-red 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 powder;

[0053] (6) Dissolve 2 mmol cadmium salt in 200 ml deionized water and stir at room temperature for 15 min;

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

[0055] (8) Add 0.75 mmol buffer salt to the ab...

Embodiment 2

[0062] (1) Dissolve 2 mmol of bismuth salt in 35 ml of ethylene glycol and stir magnetically for 30 min at room temperature;

[0063] (2) Dissolve 2 mmol of iodine source in 35 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;

[0064] (3) Transfer the above mixed solution to a reaction kettle, and put it in an oven at 140°C for 8 h to obtain an orange-red solid;

[0065] (4) The orange-red solid was separated by centrifugation, washed three times with deionized water and absolute ethanol respectively, and dried in an oven at 60°C;

[0066] (5) Take out the dried solid and grind it with an agate mortar to obtain dry BiOI powder;

[0067] (6) Dissolve 2 mmol cadmium salt in 200 ml deionized water and stir at room temperature for 15 min;

[0068] (7) Add the prepared BiOI powder to the above solution and continue stirring for 15 min;

[0069] (8) Add 0.75 mmol buffer salt to the abo...

Embodiment 3

[0076] (1) Dissolve 3 mmol of bismuth salt in 35 ml of ethylene glycol and stir magnetically for 30 min at room temperature;

[0077] (2) Dissolve 3 mmol of iodine source in 35 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;

[0078] (3) Transfer the above mixed solution to a reaction kettle, put it in an oven at 140°C for 12 h, and obtain an orange-red solid;

[0079] (4) The orange-red solid was separated by centrifugation, washed three times with deionized water and absolute ethanol respectively, and dried in an oven at 60°C;

[0080] (5) Take out the dried solid and grind it with an agate mortar to obtain dry BiOI powder;

[0081] (6) Dissolve 1 mmol cadmium salt in 200 ml deionized water and stir at room temperature for 15 min;

[0082] (7) Add the prepared BiOI powder to the above solution and continue stirring for 15 min;

[0083] (8) Add 0.75 mmol buffer salt to the abov...

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Abstract

The invention provides a preparation method and an application for a CdS / BiOI heterojunction photo-catalyst. The method comprises the following steps: firstly, respectively dissolving bismuth salt material and iodine source material in glycol, mixing the two solutions and stirring for 1h; transferring a mixed solution into a reaction kettle and reacting for 8-16h at 120-200 DEG C, thereby acquiring an orange red solid; washing, drying and grinding the orange red solid, thereby acquiring dry BiOI powder; dissolving cadmium salt in deionized water, adding BiOI powder and buffer salt in turn and increasing the temperature of the reaction system from room temperature to 30-90 DEG C; adding complexing agent into the system, dropwise adding 50ml solution containing sulfur source material into the system and stirring for 15min, thereby acquiring yellow sediment; and washing, drying and grinding the yellow sediment, thereby acquiring the yellow powder, namely, the CdS / BiOI heterojunction photo-catalyst. The CdS / BiOI heterojunction photo-catalyst prepared according to the invention is used for degrading the organic pollutants in water. Compared with the photo-catalysts, such as, commercial TiO2 (P25), pure phase CdS and pure phase BiOI, the catalyst has higher visible-light catalytic activity.

Description

technical field [0001] The invention belongs to the field of semiconductor photocatalysis, and relates to a preparation method and application of a cadmium sulfide / bismuth oxyiodide heterojunction photocatalyst. Background technique [0002] Semiconductor photocatalysis technology is to use semiconductors to degrade pollutants in the air and water environment under the irradiation of ultraviolet light or visible light, and finally generate carbon dioxide, water and other harmless inorganic ions. Thorough and no secondary pollution and other characteristics, it has broad application prospects in sewage treatment, air purification, and solving energy crisis. Due to TiO 2 It has the advantages of good photocatalytic activity, strong light corrosion resistance, high stability, relatively low price and non-toxic to human body, etc., and has become the most promising semiconductor photocatalyst at present. However, TiO 2 The energy bandgap is wide (about 3.2 eV), and ultraviole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30C02F101/30C02F101/34
CPCC02F1/30B01J27/06C02F2305/10C02F2101/34C02F2101/345C02F2101/308B01J35/39
Inventor 蒋峰芝王珊陈宇
Owner YUNNAN UNIV
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