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

A high-adsorption, rectorite technology is applied in the field of preparation of high-adsorption composite visible light catalysts, and can solve the problems of low-concentration pollutant degradation efficiency, insufficient photocatalyst adsorption capacity, and narrowing of visible light activity, etc. Low cost, strong adsorption capacity, and the effect of increasing specific surface area

Inactive Publication Date: 2012-06-27
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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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
  • 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 / rectorite composite highly absorbing visible light catalyst, it comprises the following steps:

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

[0019] 2) Weigh 2g of sodium-based rectorite into a beaker filled with 500mL of water, ultrasonically disperse for 0.5h to obtain a suspension of sodium-based rectorite, then put it into a water bath, and raise the temperature to 70°C under continuous stirring .

[0020] Maintain a constant temperature of 70°C and continuous vigorous stirring, and use a constant flow titration pump to transfer nitrogen-containing TiO 2 The sol was added dropwise to the sodium-based rectorite suspension...

Embodiment 2

[0025] A kind of nano TiO 2 The preparation method of / rectorite composite highly absorbing visible light catalyst, it comprises the following steps:

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

[0027] 2) Weigh 2 g of sodium-based rectorite into a beaker filled with 500 mL of water, disperse ultrasonically for 1 hour to obtain a suspension of sodium-based rectorite, then put it into a water bath, and raise the temperature to 70°C while stirring continuously.

[0028] Maintain a constant temperature of 70°C and continuous vigorous stirring, and use a constant flow titration pump to transfer nitrogen-containing TiO 2 The sol was added dropwise to the sodium-based rectorite suspe...

Embodiment 3

[0032] A kind of nano TiO 2 The preparation method of / rectorite composite highly absorbing visible light catalyst, it comprises the following steps:

[0033] 1) Take 30mmol of TiCl 4 Added to 6mol / L HCl (HCl and TiCl4 The molar ratio is 1:1.2), and then add 3.75mL of 1mol / L urea solution (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 pale yellow sol was left to age for 6 hours to obtain nitrogen-containing TiO 2 Sol.

[0034] 2) Weigh 2g of sodium-based rectorite into a beaker filled with 500mL of water, ultrasonically disperse for 0.5h to obtain a suspension of sodium-based rectorite, then put it into a water bath, and raise the temperature to 70°C under continuous stirring .

[0035] Maintain a constant temperature of 70°C and continuous vigorous stirring, and use a constant flow titration pump to transfer nitrogen-containing TiO 2 The sol was added dropwise to the sodium-based rectorite sus...

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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 TiO2sol; 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 Photocatalysts cannot effectively use visible light due to their large bandgap width, which greatly limits their wide application. Raise TiO 2 Visible light photocatalytic activity of photocatalysts has become an important hot issue in the field of photocatalysis research. A series of studies in the past decade have shown that non-metallic doping can make TiO 2 The bandgap width is reduced, thus effectively improving the TiO 2 Visible light catalytic activity of photocatalysts. Among the nonmetallic doping elements studied, doping with nitrogen proved to be very effective. 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 occurs due to the forbidden band of the semiconductor. On the other h...

Claims

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Application Information

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Patent Type & Authority Patents(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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