Method for preparing BiOI/WO3 composite heterojunction photocatalyst

A composite photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low catalytic activity and achieve good dispersion, complete crystallization, and regular morphology Effect

Inactive Publication Date: 2016-06-22
JIANGSU UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] Metal oxides have been widely used in many fields due to their unique electrical and optical properties, among which tungsten oxide (WO 3 ) has stable chemical properties, suitable bandgap width can respond to visible light, so it has become the focus of attention in the field of photocatalysis; however, the catalytic activity of existing transition metal tungstate catalysts is still very low, which cannot meet the requirements of practical applications. Therefore, improving the separation efficiency of electrons and holes to improve the catalytic activity of this type of photocatalyst is still a challenging is

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  • Method for preparing BiOI/WO3 composite heterojunction photocatalyst
  • Method for preparing BiOI/WO3 composite heterojunction photocatalyst
  • Method for preparing BiOI/WO3 composite heterojunction photocatalyst

Examples

Experimental program
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Example Embodiment

[0020] Example 1 BiOI / WO 3 Preparation of nanorods

[0021] Measure 2mmol of sodium tungstate and add it to a beaker containing 25ml of deionized water, adjust the pH of the mixed solution to 1 with a mass fraction of about 65% concentrated nitric acid, stir it magnetically, and then hydrothermally react at 180°C for 24 hours , The precipitate obtained by centrifugal water washing and drying at 60°C to obtain tungsten oxide; dissolve the prepared tungsten oxide in deionized water, disperse it ultrasonically, and add equimolar potassium iodide and bismuth nitrate under stirring conditions to control the bismuth nitrate and The molar ratio of tungsten oxide is 0.25, 0.5, 1.0, 1.5 and 2.0 respectively. The yellow product obtained after stirring and mixing is washed with deionized water and ethanol, filtered, and dried in a constant temperature drying box at 60°C.

Example Embodiment

[0022] Example 2BiOI / WO 3 Characterization and Analysis of Heterojunction Composite Photocatalyst

[0023] Such as figure 1 As shown, it can be seen from the figure that the composite sample has both BiOI and WO 3 Characteristic peaks, indicating that we successfully prepared BiOI / WO 3 Heterojunction composite photocatalyst.

[0024] Such as image 3 As shown, it can be seen that the bismuth iodide oxide particles are loaded on pure WO 3 The surface of the nanosheet.

[0025] Such as figure 2 As shown, the spectrum shows the existence of Bi, O, I, W, O elements.

[0026] Such as Figure 5 As shown in the figure, it can be clearly seen that after four cycles of experiments, the photocatalytic performance of the catalyst is not significantly reduced.

Example Embodiment

[0027] Example 3BiOI / WO 3 Visible light catalytic activity experiment of heterojunction composite photocatalyst

[0028] (1) Prepare a rhodamine B solution with a concentration of 10 mg / L, and place the prepared solution in a dark place.

[0029] (2) Weigh BiOI / WO 3 Heterojunction composite photocatalyst 100mg (when bismuth nitrate and WO 3 The molar ratios are 0.25:1, 0.5:1, 1.0:1, 1.5:1, 2.0:1, and the obtained samples are marked as BW-0.25, BW-0.5, BW-1.0, BW-1.5, BW-2.0) , Respectively placed in the photocatalytic reactor, add 100mL of the target degradation solution prepared in step (1), magnetically stirred for 30 minutes after the composite photocatalyst is uniformly dispersed, turn on the water source and light source, and perform the photocatalytic degradation experiment.

[0030] (3) Aspirate the photocatalytic degradation liquid in the reactor every 20 minutes, and use it to measure the ultraviolet-visible absorbance after centrifugation.

[0031] (4) by Figure 4 It can be...

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Abstract

The invention relates to the technical field of preparation of heterojunction composite photocatalysts, in particular to a method for preparing BiOI/WO 3 A method for heterojunction composite photocatalysts. Disperse tungsten oxide in deionized water, add potassium iodide and bismuth nitrate, stir and mix evenly, filter and wash, and then obtain BiOI/WO 3 Heterojunction composite photocatalysts. The prepared nanocomposite photocatalysts have excellent visible light catalytic activity, especially bismuth nitrate and WO 3 The sample with a molar ratio of 1.0 has the best activity in degrading rhodamine B, and the degradation rate reaches 92% after visible light reaction for 100min, which is higher than that of pure BiOI and WO 3 high degradation activity.

Description

technical field [0001] The invention relates to the technical field of preparation of heterojunction composite photocatalysts, in particular to a method for preparing BiOI / WO 3 A method of heterojunction composite photocatalyst, using potassium iodide, sodium tungstate, nitric acid and bismuth nitrate as raw materials to prepare BiOI / WO 3 A method for heterojunction composite photocatalyst, especially a preparation method for nanocomposite photocatalyst with simple preparation process and good visible light catalytic activity. Background technique [0002] Metal oxides have been widely used in many fields due to their unique electrical and optical properties, among which tungsten oxide (WO 3 ) has stable chemical properties, suitable band gap can respond to visible light, so it has become the focus of attention in the field of photocatalysis; however, the catalytic activity of existing transition metal tungstate catalysts is still very low, which cannot meet the requirement...

Claims

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Application Information

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IPC IPC(8): B01J27/132
CPCB01J27/132
Inventor 施伟东冯翌樊明山宋橙杰陈继斌
Owner JIANGSU UNIV
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