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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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  • Summary
  • Abstract
  • Description
  • 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 issue.
[0003] Due to its special energy band structure and carrier transport characteristics, the heterojunction can effectively inhibit the recombination of photogenerated electrons and holes in the photocatalytic reaction, improve the quantum efficiency, and greatly improve the catalytic activity of the photocatalyst. Bismuth oxyiodide (BiOI ) has a narrow energy band and good visible light absorption, and is an ideal semiconductor photocatalyst for constructing heterostructures. At present, there is no research on BiOI / WO 3 Composite heterojunction and its application in photocatalytic degradation of organic pollutants

Method used

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  • Method for preparing BiOI/WO3 composite heterojunction photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1B

[0020] Example 1BiOI / 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 value of the mixed solution to 1 with concentrated nitric acid with a mass fraction of about 65%, stir it magnetically, and then hydrothermally react at 180°C for 24 hours , the precipitate obtained by centrifuging and washing with water, and drying at 60°C to obtain tungsten oxide; take the prepared tungsten oxide and dissolve it in deionized water, ultrasonically disperse it, and add equimolar potassium iodide and bismuth nitrate under the condition of stirring to control the concentration of bismuth nitrate and bismuth nitrate The molar ratios of tungsten oxide are 0.25, 0.5, 1.0, 1.5 and 2.0 respectively. After stirring and mixing evenly, the obtained yellow product is washed with deionized water and ethanol, filtered, and dried in a constant temperature drying oven at 60°C.

Embodiment 2B

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

[0023] like figure 1 As shown, it can be seen from the figure that the composite sample has both BiOI and WO 3 The characteristic peaks indicate that we have successfully prepared BiOI / WO 3 Heterojunction composite photocatalysts.

[0024] like image 3 As shown, it can be seen that bismuth oxyiodide particles loaded on pure WO 3 the surface of the nanosheets.

[0025] like figure 2 As shown, the spectrum shows the presence of Bi, O, I, W, O elements.

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

Embodiment 3B

[0027] Example 3BiOI / WO 3 Visible light catalytic activity experiments of heterojunction composite photocatalysts

[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 ratio is 0.25:1, 0.5:1, 1.0:1, 1.5:1, 2.0:1, and the obtained samples are recorded 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), and stir magnetically for 30 minutes. After the composite photocatalyst is dispersed evenly, turn on the water source and the light source to conduct the photocatalytic degradation experiment.

[0030] (3) Absorb the photocatalytic degradation liquid in the reactor every 20 minutes, and use it for the measurement of the ultraviolet-visible absorbance after centrifugation.

[0031] (...

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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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