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Titanium dioxide microsphere array supported platinum visible-light photocatalyst and preparation method

A titanium dioxide, microsphere array technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low photocatalytic quantum efficiency, limited solar energy utilization, solar energy It can not achieve the problems such as good degradation effect, easy control of preparation parameters, and uniform composition.

Inactive Publication Date: 2013-07-31
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to TiO 2 The forbidden band (3.2eV) is wide, the light absorption is only limited to the ultraviolet region, and the available solar energy is less than 5% of the solar spectrum irradiating the ground, and TiO 2 The high recombination rate of photogenerated electron-hole pairs leads to low photocatalytic quantum efficiency (not higher than 20%), so the utilization efficiency of solar energy is only about 1%, which greatly limits the utilization of solar energy

Method used

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  • Titanium dioxide microsphere array supported platinum visible-light photocatalyst and preparation method
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  • Titanium dioxide microsphere array supported platinum visible-light photocatalyst and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Mix 4ml, 7ml, and 40ml of deionized water, 13mol / L ammonia water and absolute ethanol, then add 2g of tetraethyl orthosilicate and 50ml of ethanol mixture, at 20°C Stir for 18 hours. After the reaction, wash with ethanol and deionized water several times, settle and self-assemble, calcinate at 750°C, and soak it in a solution with a mass ratio of benzoyl peroxide to methyl methacrylate of 1:100 , polymerized at 60°C. The excess polymer was removed with tetrahydrofuran, and the silica template was removed with 2% HF solution by mass fraction to obtain a PMMA (polymethyl methacrylate) counter-template.

[0024] (2) Add 2 g of isopropyl titanate dropwise into 2 g of hydrochloric acid solution, stir for 0.5 h, then add 5 ml of ethanol solution, and continue stirring for 2 h to obtain a titanium sol. The PMMA template was soaked in the titanium sol for 4h, then taken out and aged for 2d, and calcined at 400°C for 4h to remove the polymer.

[0025] (3) Weigh 0.5g of the...

Embodiment 2

[0029] The preparation method of platinum-supported titanium dioxide microsphere array catalyst, the steps are the same as in Example 1, the difference is: the quality of chloroplatinic acid used is 0.01g

[0030] Weigh 0.02g of the platinum-supported titanium dioxide opal catalyst prepared above to carry out the experiment of visible light catalytic degradation of rhodamine B, the concentration of rhodamine B is 5mg L -1 , the degradation rate of Rhodamine B was 87.3% after visible light irradiation for 1h.

Embodiment 3

[0032] The preparation method of the platinum-supported titania opal catalyst, the steps are the same as in Example 1, except that the quality of chloroplatinic acid used is 0.015g

[0033] Weigh 0.02g of the platinum-supported titanium dioxide opal catalyst prepared above to carry out the experiment of visible light catalytic degradation of rhodamine B, the concentration of rhodamine B is 5mg L -1 , the degradation rate of Rhodamine B was 93.6% after visible light irradiation for 1h.

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Abstract

The invention relates to a titanium dioxide microsphere array supported platinum visible-light photocatalyst and a preparation method, and belongs to the field of titanium dioxide photocatalysis. A catalyst carrier is a TiO2 microsphere array prepared by a two-step template method, with the diameter of the microsphere being 100-300 nm and has an anatase phase structure. A chloroplatinic acid is used as a platinum source, and a Pt-deposited TiO2 microsphere array is obtained by hydrogen gas reduction. The microsphere array structure is beneficial to increase absorption to light of TiO2; the platinum particles obtained by hydrogen gas reduction have relatively small particle size and uniform distribution, and can effectively increase separation of photogenerated electrons and holes, so that quantum yield is increased; and the both of the above points are beneficial to increase of photocatalytic efficiency. The method is easy to operate and control, has good visible-light photocatalytic performance, and has good application prospects.

Description

technical field [0001] The invention relates to the field of titanium dioxide photocatalysis, in particular to the field of preparation and application of platinum visible light photocatalyst supported by titanium dioxide microsphere arrays. The catalyst prepared by the method is especially suitable for catalytic degradation of organic dyes (such as rhodamine B) under visible light irradiation, and achieves a high degradation rate. Background technique [0002] With the rapid development of modern industry, a large amount of waste water containing toxic and carcinogenic organic substances is discharged, and the degree of pollution to the environment increases year by year. These harmful organic substances seriously threaten human health. The treatment technology of this kind of wastewater has become the focus of current research. Photocatalysis uses semiconductors as catalysts to use sunlight to degrade various pollutants in water and air or decompose water to obtain hydrog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42C02F1/30C02F101/30C02F103/30
CPCY02W10/37
Inventor 徐联宾王玲玲陈建峰胡志彦黄燕
Owner BEIJING UNIV OF CHEM TECH
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