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Supersonic preparation of phthalocyanin sensitized nano cobalt dioxide powder

A nano-powder and titanium dioxide technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of difficult control of doping concentration and microstructure, unstable photocatalyst performance, and uniform dispersion of the system In order to solve the problems of poor performance and other problems, it can achieve the effects of good anatase crystal form, high visible light catalytic activity, short preparation cycle and high stability.

Inactive Publication Date: 2005-10-12
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

Obviously, the poor dispersion uniformity of the system, the difficulty in controlling the doping concentration and microstructure make the phthalocyanine-sensitized composite TiO prepared by these direct composite methods 2 Photocatalyst has the disadvantages of unstable performance, difficult to control the production process and high cost, which limits its popularization and use, so it is necessary to develop a new preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The composition (molar composition) of the nano-powder precursor liquid used is: titanium tetrachloride 10±0.2, triethanolamine 10±0.2, ethanol 30±1.2, deionized water 15±2.5, sulfonated aluminum phthalocyanine 0.12±0.05. Adjust the temperature of the mixture to 25°C to 30°C, and stir for 30±5 minutes to obtain a uniform and clear blue precursor solution. Add ammonia water to adjust the pH value to 3-6, and obtain a translucent blue sol-like precursor solution;

[0021] Put the container containing the precursor solution in a water bath at 90±5°C, set the frequency at 20kHz and the power density at 100W / cm 2 The probe of the ultrasonic generator is immersed in the sol, ultrasonicated for 2±0.5 hours, centrifuged, washed, and vacuum-dried at 50° C. for 24 hours to obtain phthalocyanine-sensitized titanium dioxide nanopowder.

[0022] X-ray diffraction analysis (XRD) showed that the obtained titanium dioxide nanopowder had a better anatase structure; we set the 20mg / L me...

Embodiment 2

[0024] The composition (molar composition) of the nano-powder precursor liquid used is: butyl titanate 10±0.5, acetylacetone 2±0.5, ethanol 20±5, deionized water 1.28±0.5, sulfonated copper phthalocyanine 1.5±0.3. Adjust the temperature of the mixed solution to 25°C-30°C, and stir for 30±5 minutes to obtain a uniform and clear blue precursor solution; add a small amount of ammonia water to turn the solution into a blue sol-like precursor solution;

[0025] Put the container containing the precursor solution in a water bath at 40±5°C, set the frequency at 50kHz and the power density at 150W / cm 2 The probe of the ultrasonic generator is immersed in the sol, ultrasonicated for 4±0.5 hours, centrifuged, washed, and dried at 120° C. for 24 hours to obtain phthalocyanine-sensitized titanium dioxide nanopowder.

[0026] X-ray diffraction analysis (XRD) shows that the obtained titanium dioxide nanopowder has a better anatase structure; the test of photocatalytic degradation of methyl ...

Embodiment 3

[0028] The composition (molar composition) of the nano powder precursor liquid that adopts is: TiOSO 4 10±2.5, ammonia water 0.5±0.25, ethanol 350±25, deionized water 900±100, soluble metal-free phthalocyanine 0.25±0.1. Adjust the temperature of the mixed solution to 80°C±10°C, add 0.01 sulfuric acid during the period, and stir for 60±10 minutes to obtain a uniform and transparent precursor solution;

[0029] Put the container containing the precursor solution in a water bath at 70±5°C, set the frequency at 400kHz and the power density at 150W / cm 2 The probe of the ultrasonic generator is immersed in the sol, ultrasonicated for 8±0.5 hours, centrifuged, washed, and dried at 50° C. for 24 hours to obtain phthalocyanine-sensitized titanium dioxide nanopowder.

[0030] The results of X-ray diffraction analysis (XRD) and photocatalytic degradation of methyl orange under visible light with a wavelength greater than 450nm are similar to those of Example 1.

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Abstract

A process for preparing the phthalocyanine sensitized TiO2 nanoparticles by in-situ ultrasonic method includes such steps as preparing the precurse liquid of TiO2 nanoparticles, and adding phthalocyanine as sensitizer while preparing TiO2 nanoparticles in ultrasonic condition. Its advantages are high dispersity and stability, high catalytic activity to visual light and broadband.

Description

technical field [0001] The invention relates to an ultrasonic in-situ preparation method of phthalocyanine-sensitized titanium dioxide nanopowder. The phthalocyanine-sensitized titanium dioxide powder has the performance of high photocatalytic quantum efficiency and wide spectral response. Background technique [0002] TiO 2 It is an important semiconductor material. Because of its stable chemical properties, insoluble, non-toxic, low cost and other advantages, it is widely used in photocatalysis and is recognized as an ideal photocatalyst at present. But single TiO 2 The absorption wavelength is less than 400nm, almost no absorption of visible light, and the absorption of sunlight accounts for about 4% of its total energy. In order to improve the utilization rate of sunlight, TiO must be 2 Modification treatment is carried out to make it have photocatalytic performance responsive to visible light. [0003] Organic sensitized composite TiO 2 The main advantage of photoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J37/00
Inventor 王智宇钱国栋樊先平毛卫平王民权
Owner ZHEJIANG UNIV
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