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Multi-doped half-load type Fenton-assisting titanium dioxide photochemical catalyst as well as preparation method and application method

A technology of titanium dioxide and photocatalyst, which is applied in the field of photocatalytic materials, can solve the problems of difficult recycling, low photocatalytic efficiency, and low utilization rate of sunlight by photocatalysts, so as to achieve improved utilization rate, high photocatalytic activity, and less secondary pollution Effect

Inactive Publication Date: 2011-10-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To overcome TiO 2 Photocatalysts have low utilization rate of sunlight, low photocatalytic efficiency, and are not easy to recycle. The present invention provides a multi-doped half-loaded Fenton-assisted titanium dioxide photocatalyst and its preparation and application method. Responsive to visible light, and easy to recycle and reuse, which improves the photocatalytic efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Cut the viscose-based activated carbon fiber into 4×10cm block size, place it in a high-temperature activation furnace, slowly raise the temperature to 850 degrees Celsius under the protection of high-purity nitrogen, and activate it by passing hot water steam for 20 minutes, and then pass nitrogen gas until cooling;

[0047] (2) Fully mix 0.1 mol of tetra-n-butyl titanate and 116.6 mL of absolute ethanol at room temperature, and then add 0.1% La(NO 3 ) 3 , 0.05% Fe(NO 3 ) 3 and 20% urea crystals, fully stirred for 30 minutes to obtain a uniform and transparent yellow solution A;

[0048] (3) Under the conditions of ultrasonic oscillation and constant temperature of 25°C, immerse the activated carbon fiber in solution A, and oscillate and infiltrate for 4 hours;

[0049] (4) After taking out the infiltrated activated carbon fiber, place it in a high-temperature activation furnace and heat it under the protection of high-purity nitrogen gas. The heating rate is 1...

Embodiment 2

[0052] (1) Cut the viscose-based activated carbon fiber into 8×10cm block size, place it in a high-temperature activation furnace, and slowly raise the temperature to 900 degrees Celsius under the protection of high-purity nitrogen gas, and activate it with superheated steam for 25 minutes, and then pass nitrogen gas until cooling;

[0053] (2) Fully mix 0.1 mol of tetra-n-butyl titanate and 116.6 mL of absolute ethanol at room temperature, and then add 0.05% La(NO 3 ) 3 , 0.1% Fe(NO 3 ) 3 and 10% urea crystals, fully stirred for 30 minutes to obtain a uniform and transparent yellow solution A;

[0054] (3) Under the conditions of ultrasonic oscillation and constant temperature of 25°C, immerse the activated carbon fiber in solution A, and oscillate and infiltrate for 4 hours;

[0055] (4) After taking out the infiltrated activated carbon fiber, place it in a high-temperature activation furnace and heat it under the protection of high-purity nitrogen gas at a heating rate ...

Embodiment 3

[0063] Example 3: The photocatalyst in Example 1 was used to remove COD from the sewage of an oil refinery in Dongying, Shandong. The initial concentration of COD in the sewage was about 110 mg / L. The light source is a 500W high-pressure mercury lamp. After 3 hours of light reaction, COD decreased to 6mg / L, and the degradation rate was 94.5%.

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Abstract

The invention relates to a multi-doped half-load type Fenton-assisting titanium dioxide photochemical catalyst as well as a preparation method and an application method. La, Fe and N are doped so that TiO2 has visible light response. The load of ACF (Active Carbon Fiber) overcomes the disadvantages of difficult recovery and generation of second pollution of the TiO2. The creative addition of half-load type Fenton reagent solves the problems of low photocatalytic efficiency of the TiO2, large consumption of Fe<2+> of the traditional Fenton reagent, incapability of keeping concentration in flowing water, and the like. In the preparation method of the photochemical catalyst, tetra-n-butyl titanate is taken as a TiO2 precursor, absolute ethyl alcohol is taken as a solvent, and viscose-based activated carbon fibers are taken as carriers. The photochemical catalyst is prepared through drying, ultrasound processing, and calcining at a constant temperature. In the application method, ultraviolet light and visible light are taken as an excitation light source in a light-catalyzed reaction, the adding concentration of the photochemical catalyst is from 10 to 20g / L, and the adding concentration of hydrogen peroxide is from 10 to 30 mM. The photochemical catalyst has the advantages of simple preparation, high catalytic activity, easy recovery and visible light activity, and provides a basis for industrial applications.

Description

technical field [0001] The invention belongs to a photocatalytic material and its preparation method and application, in particular to a preparation method and application of a visible light-responsive titanium dioxide catalyst for removing organic pollutants in water. Background technique [0002] In recent years, people have tried to use photocatalysis to treat organic pollutants in wastewater that are difficult to degrade by previous chemical and biological methods, and some results have been achieved. Nano-TiO 2 Photocatalysts are favored by people because of their stable chemical properties, cheap and easy to obtain, and non-toxic. Due to TiO 2 Under the action of light, hydroxyl radicals with strong oxidizing ability can be generated, which can eventually completely oxidize organic pollutants to generate CO 2 , H 2 O and SO 4 2- , NO 3 - , Cl - and other inorganic ions, therefore, it can carry out advanced treatment of organic pollutants in wastewater. But Ti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/053B01J21/06C02F1/32C02F1/30C02F1/72C02F101/30
Inventor 郑经堂杨哲杨宇程于维钊曲建伟吴明铂张玉贞赵玉翠曲险峰石建稳张延宗李石刘颖
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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