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Iodine-doped titanium dioxide-bismuth oxybromide composite photocatalyst and preparation method thereof

A technology of titanium dioxide and bismuth oxybromide, which can be used in physical/chemical process catalysts, chemical instruments and methods, special compound water treatment, etc., can solve the problems of low photocatalytic degradation efficiency, low utilization rate, easy aggregation, etc. Efficiency, strong adsorption and degradation ability, high adsorption capacity effect

Active Publication Date: 2020-05-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used metal oxides are TiO 2 , but due to TiO 2 The bandgap width is large, easy to deactivate, easy to condense, and can only be excited by ultraviolet light less than 387nm, the utilization rate of light is low, resulting in low photocatalytic degradation efficiency

Method used

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  • Iodine-doped titanium dioxide-bismuth oxybromide composite photocatalyst and preparation method thereof
  • Iodine-doped titanium dioxide-bismuth oxybromide composite photocatalyst and preparation method thereof
  • Iodine-doped titanium dioxide-bismuth oxybromide composite photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of iodine-doped titanium dioxide-bismuth oxybromide composite photocatalyst, the steps are as follows:

[0035] (1) At 40°C, weigh 20g of P123 in 650mL of water, add 100mL of 2mol / L hydrochloric acid solution, stir until transparent, add 45g of tetraethyl orthosilicate (TEOS) dropwise, stir at constant temperature for 24h, then put it into the hydrothermal reaction kettle React at 100°C for 24h, filter and wash, dry at 40°C, and calcined at 600°C for 6h to obtain mesoporous SiO 2 Material, named SBA-15.

[0036] (2) 36g HIO 3 and 345g tetrabutyl titanate in 5000mL H 2 O was dissolved for 30 min, then dried at 100 °C for 3 h, and then calcined at 300 °C for 4 h to obtain 80 g of iodine-doped titanium dioxide as a yellow powder, named I / TiO 2 .

[0037] (3) 80g I / TiO 2 All was added to 15mL of nitric acid solution with pH=1 and stirred for 3h, 26g of SBA-15 was added, washed with water after stirring for 3h, and dried at 60°C to obtain 88g of lig...

Embodiment 2

[0044] A preparation method of iodine-doped titanium dioxide-bismuth oxybromide composite photocatalyst, the steps are as follows:

[0045] (1) The preparation method of step (1) is the same as that of Example 1.

[0046] (2) 72gHIO 3 and 345g tetrabutyl titanate in 5000mL H 2 O was dissolved for 40 min, then dried at 100 °C for 3 h, and then calcined at 350 °C for 4.5 h to obtain 90 g of iodine-doped titanium dioxide as a yellow powder, named I / TiO 2 .

[0047] (3) 90gI / TiO 2 All was added to 15mL of nitric acid solution with pH=3 and stirred for 3h, 25g of SBA-15 was added, washed with water after stirring for 3h, and dried at 60°C to obtain 91g of light yellow powder, which was named as I / TiO 2 @SBA-15.

[0048] (4) 3000mL glycerin, 3000mL H 2 O and 44g Bi(NO 3 )·5H 2 Stir at room temperature for 1 h, then add 27 g of NaBr and stir for 3 h, then add 16.3 g of I / TiO in step (3) 2 @SBA-15 continued to stir for 3 hours, then poured it into a hydrothermal reactor for 2...

Embodiment 3

[0052] A preparation method of iodine-doped titanium dioxide-bismuth oxybromide composite photocatalyst, the steps are as follows:

[0053] (1) The preparation method of step (1) is the same as that of Example 1.

[0054] (2) 106g HIO 3 and 345g tetrabutyl titanate in 5000mL H 2 O was dissolved for 50 min, then dried at 100 °C for 3 h, and then calcined at 380 °C for 5 h to obtain 100 g of iodine-doped titanium dioxide as a yellow powder, named I / TiO 2 .

[0055] (3) 100g I / TiO 2 All was added to 15mL of nitric acid solution with pH=5 and stirred for 3h, then 24g of SBA-15 was added, stirred for 3h, washed with water, and dried at 60°C to obtain 101g of light yellow powder, which was named as I / TiO 2 @SBA-15.

[0056] (4) 3000mL glycerin, 3000mL H 2 O and 49g Bi(NO 3 )·5H 2 Stir at room temperature for 1 h, then add 32 g of NaBr and stir for 3 h, then add 30.2 g of I / TiO in step (3) 2 @SBA-15 continued to stir for 3 hours, then poured it into a hydrothermal reactor fo...

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Abstract

The invention belongs to the field of inorganic nano photocatalytic materials, and particularly relates to an iodine-doped titanium dioxide-bismuth oxybromide composite photocatalyst and a preparationmethod thereof. Mesoporous silicon dioxide SBA-15 is used as a carrier; iodine, bismuth oxybromide and titanium dioxide in a certain proportion are loaded on the SBA-15 to prepare the iodine-doped titanium dioxide-bismuth oxybromide composite photocatalyst. The introduction of the iodine can make the composite material maintain a high adsorption capacity and an ordered pore structure which is noteasy to collapse, at the same time, agglomeration of TiO2 in the heat treatment process can be effectively prevented, and in addition, the iodine and the bismuth oxybromide (BiOBr) can also reduce the forbidden band width of TiO2 so as to further improve the photocatalytic degradation performance. The BiOBr and the TiO2 are introduced to the surface of the SiO2 mesoporous material, the synergistic photocatalysis effect can be achieved, the photocatalysis performance of the composite material can be effectively improved, and the degradation rate of the composite material to rhodamine B can reach 100% after a lamp is turned on for 10 min.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer photocatalytic materials, in particular to an iodine-doped titanium dioxide-bismuth oxybromide composite photocatalyst and a preparation method thereof. Background technique [0002] With the continuous acceleration of industrialization and agriculturalization, more and more organic waste compounds are discharged into water sources and cause serious water pollution, which seriously threatens the survival and development of human beings. Therefore, environmental pollution has become one of the problems that need to be solved urgently. . Photocatalytic degradation of organic compounds is an economical, rapid and sustainable green technology with great application potential. [0003] It has been found in existing research reports that using a single mesoporous material such as silicon dioxide (SiO 2 ) mesoporous materials are not ideal for photocatalytic degradation of organic pollutants. Due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135C02F1/30C02F101/30C02F101/38
CPCB01J27/135C02F1/30C02F2101/308C02F2101/38C02F2305/10B01J35/39
Inventor 陈明清郑亚超
Owner JIANGNAN UNIV
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