Preparation method and application method of visible-light response type bismuth oxychloride photocatalyst

A photocatalyst, bismuth oxychloride-type technology, applied in chemical instruments and methods, physical/chemical process catalysts, bismuth compounds, etc., can solve pollution and other problems, and achieve the effects of environmental friendliness, cheap raw materials, and full and efficient utilization

Inactive Publication Date: 2015-04-15
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the preparation and application method of a visible light-responsive bismuth oxychloride photocatalyst of the present invention is to solve the problem of the wide band gap of BiOCl photocatalyst, and propose a method that utilizes the strong reducibility and selective adsorption performance of iodide ions to make BiOCl crystal along the Specific crystal direction grows preferentially, and the absorption spectrum of BiOCl photocatalyst is broadened to the visible light region. Using sodium bismuthate, hydrochloric acid and potassium iodide as raw materials, visible light-responsive bismuth oxychloride is prepared through redox, precipitation, separation, washing and drying steps Photocatalyst and method for its application, the method fully and effectively utilizes solar energy and can solve the problem of environmental pollution

Method used

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  • Preparation method and application method of visible-light response type bismuth oxychloride photocatalyst

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Experimental program
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Effect test

Embodiment approach 1

[0020] Weigh 3.16 g of sodium bismuthate and disperse it in 40 mL of absolute ethanol. Prepare 1.2 molL -1 Dilute hydrochloric acid 40 mL, weigh potassium iodide in an equimolar amount to the chloride ion in the prepared hydrochloric acid solution and dissolve in the hydrochloric acid to form a hydrochloric acid-potassium iodide mixed solution, and add the mixed solution to sodium bismuthate-sodium bismuthate- In the absolute ethanol suspension, the suspension solution was obtained after stirring for 1.5 h. The suspension solution was filtered with suction, and the filter cake was washed three times with distilled water and absolute ethanol, and then dried at 40 °C to obtain a visible light-responsive BiOCl photocatalyst.

[0021] The obtained photocatalyst is used for oxidation treatment of rhodamine B or methylene blue aqueous solution. The degradation steps are:

[0022] Step (1): Accurately weigh 7 mg of rhodamine B or methylene blue solid, dissolve it in distilled wate...

Embodiment approach 2

[0026] Weigh 6.32 g of sodium bismuthate and disperse it in 80 mL of absolute ethanol. Prepare 1.2 molL -1 Dilute hydrochloric acid 80 mL, weigh potassium iodide in an equimolar amount to the chloride ion in the prepared hydrochloric acid solution and dissolve it in the hydrochloric acid to form a hydrochloric acid-potassium iodide mixed solution, and add the mixed solution to sodium bismuthate-sodium bismuthate- In the absolute ethanol suspension, the suspension solution was obtained after stirring for 2 h. The suspension solution was filtered with suction, and the filter cake was washed three times with distilled water and absolute ethanol, and then dried at 50 °C to obtain a visible light-responsive BiOCl photocatalyst.

[0027] The obtained photocatalyst is used for oxidation treatment of rhodamine B or methylene blue aqueous solution. The degradation steps are:

[0028] Step (1): Accurately weigh 7 mg of rhodamine B or methylene blue solid, dissolve it in distilled wat...

Embodiment approach 3

[0032] Weigh 1.58 g of sodium bismuthate and disperse it in 20 mL of absolute ethanol. Prepare 1.2 molL -1 Dilute hydrochloric acid 20 mL, weigh potassium iodide in an equimolar amount to the chloride ion in the hydrochloric acid solution and dissolve it in the hydrochloric acid to form a hydrochloric acid-potassium iodide mixed solution, and add the mixed solution to sodium bismuthate- In the absolute ethanol suspension, the suspension solution was obtained after stirring for 1.5 h. The suspension solution was suction-filtered, and the filter cake was washed three times with distilled water and absolute ethanol, and then dried at 45°C to obtain a visible light-responsive BiOCl photocatalyst.

[0033] The obtained photocatalyst is used for oxidation treatment of rhodamine B or methylene blue aqueous solution. The degradation steps are:

[0034] Step (1): Accurately weigh 7 mg of rhodamine B or methylene blue solid, dissolve it in distilled water, and dilute to 1000 mL to pr...

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Abstract

The invention discloses a preparation method and an application method of a visible-light response type bismuth oxychloride photocatalyst, and belongs to the technical field of photocatalyst water treatment in the environmental chemical industry. The preparation method is characterized by comprising the following steps of: adding sodium bismuthate into absolute ethyl alcohol, and dispersing for 1 to 1.5h by magnetic stirring; preparing 100ml of 1.2mol.L<-1> hydrochloric acid, weighing potassium iodide of which the molar weight is equal to that of chloride ions in a prepared hydrochloric acid solution, and dissolving the potassium iodide into the hydrochloric acid solution to form a hydrochloric acid-potassium iodide mixed solution; dropwise adding the prepared hydrochloric acid-potassium iodide mixed solution into a sodium bismuthate-absolute ethyl alcohol dispersing system at the speed of adding 1mL of the mixed solution within 8 to 10 minutes by the magnetic stirring; stirring for 1.5 to 2h at the reaction temperature of 20 to 20.5 DEG C to prepare a suspended solution; filtering the suspended solution to obtain a filter cake; washing the filter cake for three times by using distilled water and the absolute ethyl alcohol; and drying the filter cake at the temperature of 40 to 50 DEG C to obtain the visible-light response type bismuth oxychloride photocatalyst. The visible-light response type bismuth oxychloride photocatalyst is used for adsorption and photocatalytic degradation of Rhodamine B or methylene blue dye wastewater, has good adsorption and photocatalytic degradation functions under visible light, is stable in catalytic activity and high in recycle rate, and has a practical application prospect.

Description

technical field [0001] The invention discloses a method for preparing and applying a visible light-responsive bismuth oxychloride photocatalyst, which belongs to the technical field of environmental chemical photocatalytic water treatment, and specifically relates to a method of utilizing the structural adjustment effect of iodide ions to broaden the absorption spectrum of the bismuth oxychloride photocatalyst In the visible light region, a technical scheme for preparing a visible light-responsive bismuth oxychloride photocatalyst and its application method using sodium bismuthate, hydrochloric acid and potassium iodide as raw materials. Background technique [0002] With the development of the dye industry, its production wastewater has become one of the most important sources of water pollution. Dye sewage has the characteristics of deep color, complex composition, high COD value and refractory degradation, which brings serious harm to the ecological environment. At prese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/06C01G29/00C02F1/30C02F1/58
CPCY02W10/37
Inventor 樊彩梅毛晓明丁光月王雅文谢芳霞王韵芳侯红串
Owner TAIYUAN UNIV OF TECH
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