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Microorganism reduced noble metal (S) modified TiO2 catalyst and its prepn. method

A technology of noble metals and microorganisms, applied in the field of TiO2 catalyst and its preparation, can solve the problems of uneven agglomeration on the surface of semiconductors, difficulty in controlling the doping process of transition metal oxides, affecting the photocatalytic performance of titanium dioxide photocatalysts, etc., and achieve the improvement of photocatalytic activity , The effect of simple preparation process

Inactive Publication Date: 2006-06-28
XIAMEN UNIV
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the transition metal oxide doping process is not easy to control, and the activity of the formed compound semiconductor oxide is unstable.
The modification method of loading noble metals is due to the uneven agglomeration phenomenon on the semiconductor surface during the impregnation and reduction process, which causes the metal particles loaded on the surface of titanium dioxide to fail to form a complete nanoscale aggregation, which affects the photocatalytic performance of the titanium dioxide photocatalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of Ag / TiO Supported Titanium Dioxide Photocatalyst by Microbial Method 2 : Weigh 0.4g of anatase titanium dioxide, roast it in a muffle furnace at 200°C for 1 hour, and then disperse by 40KHz ultrasound and add it to a culture flask containing SH10 to avoid light for 5 hours to anchor the bacteria on the surface of the titanium dioxide, and centrifuge to separate the culture Solution, the titanium dioxide containing bacteria is immersed in 0.15mol / LAgNO 3 times 3 , Make the Ag loading amount 3%, stand for 24h at room temperature under the protection of flowing nitrogen, then wash with deionized water and absolute ethanol 4 times respectively, and finally store in flowing nitrogen.

[0017] The photocatalytic activity of the catalyst was evaluated in a self-made simple suspended bed photocatalytic reaction device. The visible light source was a 250W high-pressure mercury lamp with >410nm. The reaction conditions were normal pressure, room temperature, and air flo...

Embodiment 2

[0019] Preparation of Supported Titanium Dioxide Photocatalyst Pd / TiO by Microbial Method 2 : Weigh 0.4g of titanium dioxide titanium dioxide, roast it in a muffle furnace at 200°C for 1 hour, then add it to a culture flask containing R08 to prevent light for 4 hours after being dispersed by 20KHz ultrasound to anchor the bacteria on the surface of the titanium dioxide, centrifuge to separate the culture solution, and Contains bacteria R08 titanium dioxide immersed in 0.05mol / L PdCl in 3 times 2 Solution, make the load finally reach 2wt%, stand for 24h at room temperature under the protection of flowing nitrogen, wash 4 times with deionized and absolute ethanol, and finally store in flowing nitrogen. The evaluation of the photocatalytic activity of the catalyst was the same as in Example 1. The result of activity evaluation showed that the degradation rate of phenol was over 83%.

Embodiment 3

[0021] Preparation of Supported Titanium Dioxide Photocatalyst Ag-La / TiO by Microbial Method 2 :Use 0.01mol La(NO 3 ) 3 Solution impregnated TiO 2 , Make the content of La account for 0.5% of the total mass, after drying, calcining at 450°C for 3h, and lowering to room temperature, weighing 0.4 g of titanium dioxide impregnated with La, the remaining steps are the same as in Example 1, and the degradation rate of phenol is more than 87%.

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PUM

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Abstract

A microbe reduced and noble metal modified TiO2 catalyst for catalytic degradation of phenol has a formula No-La / TiO2, where No is Ag and / or Pd. Its preparing process includes such steps as calcining TiO2, ultrasonic dispersing, adding it into the bottle containing microbe R08 and SH10, dark culture, impregnating in the solution of nitrate or chloride of noble metal, laying aside, washing, putting it in flowing N2, and carrying the nano-particles of noble metal by the í‹anchoríŒ and reducing action of microbes.

Description

Technical field [0001] The invention relates to a TiO 2 The catalyst, especially relates to a kind of TiO modified by microbial reduction of precious metals for photocatalytic degradation of phenol wastewater 2 Catalyst and its preparation method. Background technique [0002] Phenolic wastewater is produced in large quantities in the processes of petroleum processing, coal coking, textile printing and dyeing, papermaking, etc. It is a refractory wastewater. Phenols can cause protein denaturation and coagulation, and are toxic to many living individuals. At present, the treatment of phenol-containing wastewater usually adopts complex biological combination process methods, such as anaerobic-anoxia-aerobic method (A / A / O method) and so on. These processes are difficult to operate and control. At the same time, the pure biological combined process treatment method cannot completely degrade phenols. There are situations such as low degradability of high-concentration phenols and unst...

Claims

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Application Information

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IPC IPC(8): B01J23/38B01J21/06B01J23/54C02F1/30C02F1/72
CPCY02W10/37
Inventor 贾立山李清彪傅谋兴孙道华刘月英傅锦坤
Owner XIAMEN UNIV
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