Bismuth oxyiodide/porous titanium dioxide composite photocatalyst and its preparation method and application

A technology of porous titanium dioxide and bismuth oxyiodide, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of high recombination rate of photogenerated electrons and holes, low utilization efficiency of visible light and sunlight , the inability of efficient catalyst application, etc., to achieve the effect of broadening the spectral response range, realizing photocatalytic activity, and good visible light catalytic activity

Active Publication Date: 2018-05-15
辽宁蓝水化学品制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But to achieve TiO 2 There are several key technical difficulties in the practical application, such as TiO 2 The inherent bandgap width is wide (3.2eV), and it can only be excited by ultraviolet light (<380nm), so its utilization efficiency for visible light and sunlight is not high
In addition, TiO 2 Due to the high recombination rate of internal photogenerated electrons and holes or the limitation of the energy band structure, it is often unable to be used as an efficient catalyst in practical problems.

Method used

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  • Bismuth oxyiodide/porous titanium dioxide composite photocatalyst and its preparation method and application
  • Bismuth oxyiodide/porous titanium dioxide composite photocatalyst and its preparation method and application
  • Bismuth oxyiodide/porous titanium dioxide composite photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Bismuth oxyiodide / porous titanium dioxide composite photocatalyst (BT-1)

[0025] The preparation method is as follows:

[0026] 1) Add 1 mL of tetrabutyl titanate into 25 mL of ethylene glycol under vigorous stirring, and supply nitrogen gas to the system for about 10 minutes while stirring; after continuous stirring for 24 hours, pour the mixture into 100 mL of acetone containing 1 mL of ultrapure water In the medium, stir for 10 minutes, after that, let it stand and age for about 16 hours; collect the product after aging, wash and dry; take 1g of the dried sample, disperse it in 80mL ultrapure water, and transfer it to 100mL lined with polytetrafluoroethylene In a stainless steel autoclave, react at 180°C for 10 hours; after naturally cooling to room temperature, filter, wash, and dry, the obtained dry white powder is porous titanium dioxide microspheres.

[0027] 2) Disperse 0.970g (0.002mol) of bismuth nitrate pentahydrate in 20mL of ethylene glycol, the...

Embodiment 2

[0028] Example 2 Bismuth oxyiodide / porous titanium dioxide composite photocatalyst (BT-2)

[0029] The preparation method is as follows:

[0030] 1) method is the same as embodiment 1.

[0031] 2) Disperse 0.485g (0.001mol) of bismuth nitrate pentahydrate in 20mL of ethylene glycol, then add 0.166g (0.001mol) of potassium iodide to the system, and stir at room temperature; then add 0.160g (0.002mol) of porous titanium dioxide microspheres , and then add 20mL ultrapure water, stir at room temperature for 2h, collect the obtained product, wash and dry to obtain bismuth oxyiodide / porous titanium dioxide composite photocatalyst, which is named BT-2. The molar ratio of bismuth oxyiodide in the component is 33%.

Embodiment 3

[0032] Example 3 Bismuth oxyiodide / porous titanium dioxide composite photocatalyst (BT-3)

[0033] The preparation method is as follows:

[0034] 1) method is the same as embodiment 1.

[0035] 2) Disperse 0.323g (0.00067mol) of bismuth nitrate pentahydrate in 20mL of ethylene glycol, then add 0.111g (0.00067mol) of potassium iodide to the system, and stir at room temperature; then add 0.160g (0.002mol) of porous titanium dioxide microspheres , and then add 20mL ultrapure water, stir at room temperature for 2h, collect the obtained product, wash and dry to obtain bismuth oxyiodide / porous titanium dioxide composite photocatalyst, which is named BT-3. The molar ratio of bismuth oxyiodide in the component is 25%.

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Abstract

The invention relates to a bismuth oxyiodide / porous titanium dioxide composite photocatalyst and its preparation method and application. It belongs to the field of photocatalysis. The technical scheme adopted is: disperse bismuth nitrate in ethylene glycol, add potassium iodide, keep stirring, then add porous titanium dioxide microspheres, and add ultrapure water, keep stirring for 1‑3h at room temperature, wash and dry the obtained product , to obtain bismuth oxyiodide / porous titanium dioxide composite photocatalyst. The invention synthesizes a porous titanium dioxide microsphere through a simple hydrothermal method, and the microsphere not only has a large specific surface area and uniform size, but is more conducive to light scattering. The bismuth oxyiodide / porous titanium dioxide composite photocatalyst synthesized with this kind of microsphere has a wide spectral response range, high photocatalytic activity under visible light, wide applicability and good stability, simple process, Easy to operate and low cost.

Description

technical field [0001] The invention relates to a new type of photocatalytic material, which belongs to photocatalytic technology. Based on the principle of semiconductor heterostructure, bismuth iodide oxide and porous titanium dioxide microspheres are combined to obtain a highly efficient composite photocatalyst with semiconductor heterostructure. Catalysts can be used in fields such as the treatment of organic pollutants in soil and water. Background technique [0002] With the rapid development of modern industry and economy, the negative impact on the environment is becoming more and more serious. Refractory organic pollutants in the environment have become a focus of environmental governance. For organic pollutants with a molecular weight of tens of thousands, there are certain difficulties in the common biochemical treatment. Since Fujishima and Honda used photocatalytic decomposition of water to produce hydrogen on n-type semiconductor titanium dioxide single crysta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/06C02F1/30B09C1/08
Inventor 张宇裴琦宋溪明
Owner 辽宁蓝水化学品制造有限公司
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