Preparation and application methods of BiOBr/BiOCl compound photocatalyst

A photocatalyst and catalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, water/sewage treatment, etc., can solve problems such as shortage, wide band gap, polluted energy, etc., achieve low cost, simple preparation method, good physical performance

Inactive Publication Date: 2011-05-25
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the preparation and application method of a BiOBr / BiOCl composite photocatalyst of the present invention is to propose a BiOBr that not only utilizes solar energy to a greater extent, but also can solve the problems of environmental pollution and energy shortage for the problem of wide band gap of BiOCl photocatalyst. Technical scheme of preparation and application method of / BiOCl composite photocatalyst

Method used

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  • Preparation and application methods of BiOBr/BiOCl compound photocatalyst
  • Preparation and application methods of BiOBr/BiOCl compound photocatalyst
  • Preparation and application methods of BiOBr/BiOCl compound photocatalyst

Examples

Experimental program
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Effect test

Embodiment approach 1

[0020] Weigh 0.315g BiCl 3 and 1.795gBiBr 3 Put together in 0.1mol·L -1 Dilute hydrochloric acid 100mL, then add 0.05mol sodium dodecylbenzenesulfonate dispersant, make BiCl 3 and BiBr 3 Fully dissolve and keep the solution in a transparent state, then slowly add 2.0mol / L Na 2 CO 3 Solution 10mL, the pH value is controlled at 8, followed by stirring for 1 hour to obtain a suspension solution, and finally, the filter cake is washed with distilled water, and then the filter cake is dried at 40°C to obtain BiOCl with a molar ratio of 1:4 / BiOBr composite photocatalyst.

[0021] The obtained photocatalyst is used for oxidation treatment of methyl orange aqueous solution. The reaction conditions are: normal temperature and pressure, 50 mL of 10 mg / L methyl orange aqueous solution, 0.8 g / L of photocatalyst, and air is blown from the bottom of the reactor. Samples were taken and analyzed at regular intervals, and the conversion rate of methyl orange was measured by UV-Vis spec...

Embodiment approach 2

[0023] Weigh 0.788g BiCl 3 and 1.122gBiBr 3 Put together in 0.1mol·L -1 Dilute hydrochloric acid 100mL, then add 0.06mol dodecyl ammonium chloride dispersant, make BiCl 3 and BiBr 3 Fully dissolve and keep the solution in a transparent state, slowly add 2.0mol / L Na 2 CO 3 Solution 12mL, the pH value is controlled at 9, followed by stirring for 1.1 hours to obtain a suspension solution, and finally, the filter cake is washed with distilled water, and then the filter cake is dried at 50°C to obtain BiOCl with a molar ratio of 1:1 / BiOBr composite photocatalyst.

[0024] The obtained photocatalyst is used for oxidation treatment of humic acid aqueous solution. The reaction conditions are: normal temperature and pressure, 50 mL of 10 mg / L humic acid aqueous solution, 1.0 g / L of photocatalyst, and air is blown from the bottom of the reactor. Samples were taken and analyzed at regular intervals, and the conversion rate of humic acid was measured by UV-Vis spectrophotometry. T...

Embodiment approach 3

[0026] Weigh 1.261g BiCl 3 and 0.449gBiBr 3 Put together in 0.1mol·L -1 Dilute hydrochloric acid 100mL, then add 0.08mol sodium dodecylbenzenesulfonate dispersant, make BiCl 3 and BiBr 3 Fully dissolve and keep the solution in a transparent state, add 0.1mol L under magnetic stirring -1 5mL of urea solution and slowly add 2.0mol / LNa 2 CO 3 Solution 15mL, the pH value is controlled at 11, followed by stirring for 1.2 hours to obtain a suspension solution, and finally, the filter cake is washed with distilled water, and then the filter cake is dried at 60°C to obtain BiOCl with a molar ratio of 4:1 / BiOBr composite photocatalyst.

[0027] The obtained photocatalyst is used for oxidation treatment of phenol aqueous solution. The reaction conditions are: normal temperature and pressure, 50 mL of 10 mg / L phenol aqueous solution, 1.2 g / L of photocatalyst, and air is blown from the bottom of the reactor. Samples were taken and analyzed at regular intervals, and the conversion...

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Abstract

The invention relates to preparation and application of a BiOBr / BiOCl compound photocatalyst, belonging to the technical field of photocatalysis water treatment in environmental chemical engineering. In the invention, the preparation method comprises the following steps: hydrolyzing BiCl3 and BiBr3 which are used as raw materials, precipitating, carrying out solid-liquid separation, drying and the like to obtain the BiOBr / BiOCl compound photocatalyst. The BiOBr / BiOCl compound photocatalyst can be used for degrading organic substances in water, and especially for treating trace amounts of toxic and harmful nondegradable organic substances in water. The BiOBr / BiOCl compound photocatalyst prepared by the invention has the advantages of simple technique, low cost, high photocatalysis activityand the like, is safe to operate, and has wide industrial application prospects.

Description

technical field [0001] The invention relates to a preparation and application method of a BiOBr / BiOCl composite photocatalyst, which belongs to the technical field of photocatalytic water treatment of environmental chemical industry. Background technique [0002] Today, as the global environmental pollution and energy crisis are becoming more and more serious, how to effectively use solar energy to control environmental pollution has attracted more and more attention. Since Japanese scientists Fujishima and Honda discovered TiO in 1972 2 Since single crystal electrodes can realize photocatalytic water splitting, semiconductor photocatalytic reactions have been the main content of photocatalytic research. Among them, TiO 2 is the most widely used photocatalyst, but TiO 2 (3.2eV) has a wide band gap, corresponding to an excitation wavelength of 387nm. Limited by it, it can only show its photocatalytic activity under the condition of excitation by ultraviolet light (200-400n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30C02F1/72C02F1/58
Inventor 樊彩梅王艳李双志王韵芳史竹青丁光月郝晓刚梁镇海
Owner TAIYUAN UNIV OF TECH
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