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Method for preparing nano TiO2/rectorite composite high-adsorbability visible light catalyst

A high adsorption and rectorite technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low degradation efficiency of low-concentration pollutants, insufficient adsorption capacity of photocatalysts, Narrowing the visible light activity and other issues to achieve the effect of low cost, strong adsorption capacity, and increased specific surface area

Inactive Publication Date: 2010-12-01
WUHAN UNIV OF TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ashia et al. showed that nitrogen doping partially replaces lattice oxygen to generate lattice defects, and it is this defect that narrows the TiO 2 Visible light activity due to the forbidden band of semiconductors
On the other hand TiO 2 The adsorption capacity of the photocatalyst is not strong enough, so that the degradation efficiency of low-concentration pollutants is not high, and many pollutants in the environment will cause serious pollution even at very low concentrations, so increasing TiO 2 The adsorption properties of photocatalysts have also attracted the attention of many scholars.

Method used

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  • Method for preparing nano TiO2/rectorite composite high-adsorbability visible light catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A kind of nano TiO 2 The preparation method of / retorite composite high-adsorption visible light catalyst includes the following steps:

[0018] 1) Mix 60mmol TiCl 4 , Press HCl / TiCl 4 Dissolve it in 6mol / L HCl at a molar ratio of 1:1.2, and then add 1mol / L urea solution 7.5mL (TiCl 4 The molar ratio of the Ti element in the urea solution to the N element in the urea solution is 4:1), and the obtained light yellow sol is allowed to stand and age for 6 hours to obtain nitrogen-containing TiO 2 Sol.

[0019] 2) Weigh 2g of sodium-based rectorite into a beaker containing 500mL of water, and ultrasonically disperse for 0.5h to obtain a sodium-based rectorite suspension, then put it in a water bath and heat up to 70℃ under continuous stirring. .

[0020] Keeping a constant temperature of 70℃ and continuous vigorous stirring, use a constant flow titration pump to remove the nitrogen-containing TiO at a speed of 1 mL / min. 2 The sol was added dropwise to the sodium rectorite suspensio...

Embodiment 2

[0025] A kind of nano TiO 2 The preparation method of / retorite composite high-adsorption visible light catalyst includes the following steps:

[0026] 1) Mix 60mmol TiCl 4 , Press HCl / TiCl 4 Dissolve in 6mol / L HCl at a molar ratio of 1:1.2, and then add 15mL of 1mol / L urea solution (TiCl 4 The molar ratio of Ti element in the urea solution to the N element in the urea solution is 2:1), and the obtained pale yellow sol is allowed to stand and age for 6 hours to obtain nitrogen-containing TiO 2 Sol.

[0027] 2) Weigh 2g of sodium-based rectorite into a beaker containing 500 mL of water, and ultrasonically disperse for 1 hour to obtain a sodium-based rectorite suspension, then put it in a water bath, and heat up to 70°C under continuous stirring.

[0028] Keeping a constant temperature of 70℃ and continuous vigorous stirring, use a constant flow titration pump to remove the nitrogen-containing TiO at a rate of 1 mL / min. 2 The sol was added dropwise to the sodium rectorite suspension (Ti...

Embodiment 3

[0032] A kind of nano TiO 2 The preparation method of / retorite composite high-adsorption visible light catalyst includes the following steps:

[0033] 1) Take 30mmol of TiCl 4 Add to 6mol / L HCl (HCl and TiCl 4 The molar ratio is 1:1.2), and then add 1mol / L urea solution 3.75mL (TiCl 4 The molar ratio of the Ti element in the urea solution to the N element in the urea solution is 4:1), and the obtained light yellow sol is allowed to stand and age for 6 hours to obtain nitrogen-containing TiO 2 Sol.

[0034] 2) Weigh 2g of sodium-based rectorite into a beaker containing 500mL of water, disperse ultrasonically for 0.5h to obtain a sodium-based rectorite suspension, then put it in a water bath, and heat up to 70℃ under continuous stirring. .

[0035] Keeping a constant temperature of 70℃ and continuous vigorous stirring, use a constant flow titration pump to remove the nitrogen-containing TiO at a speed of 1 mL / min. 2 The sol was added dropwise to the sodium rectorite suspension (TiCl 4...

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Abstract

The invention relates to a method for preparing a high-adsorbability composite visible light catalyst, in particular to a method for preparing a nano TiO2 / rectorite composite high-adsorbability visible light catalyst, which is characterized by comprising the following steps: 1) dissolving TiCl4 in 6mol / L HCl according to a molar ratio of the HCL to the TiCl4 of 1:1.2, adding nitrogen-doped precursor solution according to the molar ratio of the Ti element in the TiCl4 to the N element in the nitrogen-doped precursor solution of (1-5):1, standing for aging and obtaining nitrogen-containing TiO2 sol; 2) selecting sodium-based rectorite suspension according to the mixing ratio of the TiCl4 to the sodium-based rectorite in the sodium-based rectorite suspension of (30-60)mmol:2g, dripping the nitrogen-containing TiO2 sol into sodium-based rectorite suspension at 70 DEG C, stirring, aging, centrifuging, washing and obtaining a precipitate; and 3) drying, roasting and obtaining the nano TiO2 / rectorite composite high-adsorbability visible light catalyst. The catalyst prepared by the method has the characteristics of high adsorbability and high visible light activity; meanwhile, the method has the characteristics of mild conditions and simple and convenient operation.

Description

Technical field [0001] The invention relates to a preparation method of a high-adsorption composite visible light catalyst. technical background [0002] TiO 2 Due to the large forbidden band width, the photocatalyst cannot effectively use visible light, which greatly limits its wide application. Improve TiO 2 Visible light catalytic activity of photocatalysts has become an important hot issue in the field of photocatalysis research. A series of studies in the past ten years show that non-metal doping can make TiO 2 The band gap is reduced, thereby effectively improving TiO 2 Visible light catalytic activity of the photocatalyst. Among the non-metallic doping elements studied, nitrogen doping proved to be very effective. The study of Ashia et al. showed that doped nitrogen partially replaces the lattice oxygen to produce lattice defects. It is this defect that narrows the TiO 2 The band gap of the semiconductor produces visible light activity. TiO on the other hand 2 The photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
Inventor 张高科卜显忠王道杰郭亚丹
Owner WUHAN UNIV OF TECH
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