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Water heating preparation of phthalocyanin sennsitized nano cobalt dioxide powder

A nano-powder, titanium dioxide technology, applied in the field of hydrothermal in-situ preparation, can solve the problems of difficult control of doping concentration and microstructure, high cost, unstable photocatalyst performance, etc., and is beneficial to product quality control and preparation technology. Reasonable route and high visible light catalytic activity

Inactive Publication Date: 2005-10-12
ZHEJIANG UNIV
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Problems solved by technology

However, the poor dispersion uniformity of the system, the difficulty in adjusting 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, and the prospect of industrial application is worrying

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 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 20°C-50°C, and after stirring, a uniform and clear dark blue precursor solution is obtained.

[0022] Put this solution into the reaction kettle, add a small amount of ethanol in advance; then seal the reaction kettle, raise it to 240±1℃ at a speed of about 1-5℃ / min and keep it warm for hydrothermal reaction. At this time, the liquid in the kettle is vaporized, and butyl titanate undergoes a hydrolysis reaction; after 4 to 6 hours of reaction, stop heating, take out the sample after the reaction kettle is naturally cooled to room temperature, and wash and dry to obtain highly visible photocatalytically active phthalocyanine sensitized Titanium dioxide nanopowder.

[0023] About 15-18 mole percent of phthalocyanine is c...

Embodiment 2

[0026] 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 mixed solution to 90°C, and after stirring, a uniform and clear dark blue precursor solution is obtained.

[0027] Put this solution into the reaction kettle, add a small amount of water in advance, then seal the reaction kettle, raise it to 280±10℃ at a speed of about 1-5℃ / min and keep it warm for hydrothermal reaction. At this time, the liquid in the kettle is vaporized, and titanium tetrachloride undergoes a hydrolysis reaction; after 3 to 4 hours of reaction, stop heating, take out the sample after the reaction kettle is naturally cooled to room temperature, and wash and dry to obtain highly visible photocatalytically active phthalocyanine sensitized Titanium dioxide nanopowder.

[0028] In this nanometer titanium dio...

Embodiment 3

[0030] 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 of sulfuric acid during the period, and after stirring, a uniform dark blue precursor solution is obtained.

[0031] Put the precursor liquid into the autoclave, add a small amount of water and ethanol in advance, then seal the autoclave, raise it to 200±5 °C at a speed of about 1-5 °C / min and keep it warm for hydrothermal reaction. Heating is stopped after 8-10 hours, and the sample is taken out after the reaction kettle is naturally cooled to room temperature, washed and dried to obtain phthalocyanine-sensitized titanium dioxide nanopowder with high visible photocatalytic activity.

[0032] In this nanometer titanium dioxide anatase crystal powder, about 2.0-3.5 mole percent of phthalocyanin...

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Abstract

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

Description

technical field [0001] The invention relates to a hydrothermal in-situ preparation method of phthalocyanine-sensitized titanium dioxide nanopowder. The phthalocyanine-sensitized titanium dioxide powder has the properties of high photocatalytic quantum efficiency and wide spectral response. Background technique [0002] In chemical engineering, materials and environmental science, TiO 2 Photocatalytic materials and application technology is a hotspot. TiO 2 It is an important semiconductor material. It is recognized as an ideal photocatalyst because of its stable chemical properties, insoluble, non-toxic, and low cost. 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. [...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J31/02B01J37/00
Inventor 王智宇樊先平钱国栋陈海锋王民权
Owner ZHEJIANG UNIV
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