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Preparation of visible light response titanium base film and method for degrading binary dye

A visible light and thin film technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems that have not been reasonably and effectively introduced into the field of preparation and application of visible light-responsive thin film materials, and achieve remarkable results Visible light response characteristics, high-efficiency visible light photocatalytic performance, simple and easy-to-operate effect

Inactive Publication Date: 2011-09-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, by consulting relevant domestic and foreign journals and patent materials, it is found that the current method of using non-metal element doping to prepare visible light-responsive TiO 2 Thin films, mostly concentrated in N, C doping, I doping TiO 2 Although the material has been proven to exhibit superior optical properties under both ultraviolet and visible light, it has not been reasonably and effectively introduced into the field of visible light-responsive thin film material preparation and application, and I-doped TiO 2 Most of the materials are used in the form of powder for photocatalytic degradation

Method used

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  • Preparation of visible light response titanium base film and method for degrading binary dye
  • Preparation of visible light response titanium base film and method for degrading binary dye
  • Preparation of visible light response titanium base film and method for degrading binary dye

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Experimental program
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Embodiment 1

[0030] Measure 22.104ml (21.22g) of titanium tetraisopropoxide into a 100ml Erlenmeyer flask, add 4.136ml (4.34g) of acetic acid dropwise, and magnetically stir at room temperature for 15 minutes. Then quickly pour this mixture into a 250ml three-necked flask equipped with 105ml of water. A certain amount of iodic acid was dissolved in the flask in advance, and vigorously stirred under strong mechanical stirring. After stirring for 1 hour, 1.96 ml of nitric acid with a mass content of 65% was added, and the mixture was heated from room temperature to 50° C. in a water bath within 40 minutes, and solified at this temperature for 75 (out of range) minutes. After solization, add water to lower the temperature of the mixture, and adjust the volume to 134ml. Put the mixed solution in a polytetrafluoroethylene hydrothermal kettle, and conduct a hydrothermal reaction at 180° C. for 12 hours. Thus prepared iodine-doped TiO 2 nanocrystal.

[0031]Or measure 22.104ml (21.22g) of tetr...

Embodiment 2

[0038] TiO with different iodine doping 2 The nanocrystalline film was dipped in 40ml Flu / RhB initial solution and 40ml RhB initial solution respectively, the RhB concentration in the initial solution was 2mg / L, and the Flu concentration was 7mg / L. Visible light (above 400nm) is obtained by a halogen lamp equipped with a 420nm filter. Before light exposure, the solution was magnetically stirred for half an hour in the dark to achieve dye adsorption equilibrium on the film surface. The entire reaction device is open, and the solution is always in a state of magnetic stirring when the light is on. After illumination, samples were taken every hour, and the absorbance of the dye at different times was measured by an ultraviolet spectrophotometer, and then the absorbance was converted into concentration, so as to observe the change of RhB concentration over time.

Embodiment 3

[0040] TiO doped with 10% iodine 2 The nanocrystalline thin films were immersed in 40ml EO / RhB initial solution, 40ml RhB initial solution and 40ml EO initial solution respectively. The RhB concentration in the initial solution was 4mg / L, and the EO concentration was 20mg / L. Visible light (above 400nm) is obtained by a halogen lamp equipped with a 420nm filter. Before light exposure, the solution was magnetically stirred for half an hour in the dark to achieve dye adsorption equilibrium on the film surface. The entire reaction device is open, and the solution is always in a state of magnetic stirring when the light is on. After illumination, samples were taken every hour, and the absorbance of the dye at different times was measured by an ultraviolet spectrophotometer, and then the absorbance was converted into concentration, so as to observe the change of the dye concentration over time.

[0041] like image 3 , it can be seen that the iodine-doped TiO 2 The photocatalyti...

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Abstract

The invention discloses preparation of a visible light response titanium base film and a method for degrading binary dye, belonging to the technical field of titanium dioxide film material. The preparation method comprises the following steps of: dripping acetic acid into a titanium source to be mixed with an iodine source solution; stirring and adding acetic acid; in a polytetrafluoroethylene hydrothermal kettle, carrying out oil bath at the temperature of 120-250DEG C for 2-20 hours to obtain iodine-doped TiO2 nanocrystalline; grinding the nanocrystalline and polyethylene glycol 6000 to obtain TiO2 nanocrystalline colloid; coating the TiO2 nanocrystalline colloid on a glass sheet by a blade coating method; and treating in a muffle furnace at 250-600DEG C for 0.5-2 hours to obtain an I-TNC film. The prepared I-TNC film is soaked in a binary dye pollutant solution, the solution is stirred in the dark for 0.2-1 hour under magnetic force stirring, and then illumination degradation is performed. The method disclosed by the invention is simple and easy to operate and has the advantages of strong controllability and repeatability and efficient visual light photocatalysis.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide thin film materials, and in particular relates to a preparation method of iodine-doped titanium dioxide thin film and a research on the visible light photocatalytic degradation dye used as a dye. Background technique [0002] Due to the emergence of global environmental pollution and energy crisis, people are highly concerned about energy and environmental issues, and it is urgent to develop functional materials with high efficiency, low energy consumption, wide application range, and no pollution to the environment. Because photocatalytic technology can degrade and decompose organic and inorganic pollutants without secondary pollution, and the photocatalytic process does not require the use of expensive oxidants, and can also use sunlight to trigger the photocatalytic process, photocatalysts can also be regenerated and recycled Features. Therefore, research on photocatalytic technology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135A62D3/10A62D101/28A62D101/26
Inventor 陶霞黄玉萍李昕陈建峰
Owner BEIJING UNIV OF CHEM TECH
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