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Supported photocatalyst as well as preparation method and application thereof

A photocatalyst, supported technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. Recovery and reuse, improved degradation and mineralization efficiency, fast and efficient loading

Active Publication Date: 2013-02-27
紫科装备股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in practical application of this technology to be further solved.
First of all, the utilization rate of light source is low and the recovery of photocatalyst is difficult
Most of the photocatalysts used in the treatment of organic pollutants in photocatalytic oxidation technology are powders, which may cause waste of catalysts in the process of atmospheric treatment, and during the reaction, only a small amount of photocatalysts on the surface absorb ultraviolet light However, it plays the role of photocatalyst, resulting in low photon quantum efficiency. At the same time, the powder photocatalyst is easy to lose during the reaction process, which is not conducive to the reuse of photocatalyst, and brings certain difficulties to the practical application of degrading gas phase organic matter.
Secondly, the efficiency of gas-solid phase photocatalysis is easily affected by the actual atmospheric environmental factors.
Photocatalytic technology is greatly affected by the concentration level of pollutants, relative humidity, and oxygen concentration. Especially in industrial applications, the environmental application conditions are more complex, which often leads to low photocatalytic efficiency.
Finally, the photocatalyst has poor long-term activity stability
During the process of photocatalytic degradation of organic matter, the surface of photocatalyst is prone to deposit difficult-to-degrade intermediates, thereby blocking the contact between the catalyst and ultraviolet light, resulting in a decrease in the catalytic activity of the photocatalyst, and cannot be regenerated in situ, which greatly affects the industrial application of photocatalytic oxidation technology

Method used

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  • Supported photocatalyst as well as preparation method and application thereof
  • Supported photocatalyst as well as preparation method and application thereof
  • Supported photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of foam metal supported photocatalyst:

[0042] (1) Electrode pretreatment: Clean the nickel foam metal mesh (area size: 50mm×200mm) for 3 times in 0.1mol / L hydrochloric acid, and then ultrasonicate in absolute ethanol (ultrasonic instrument with a frequency of 40kHz) for 30min , and then washed 3 times with deionized water, dried at room temperature and used as electrode cathode; with the same ultrasonic frequency, the titanium sheet was ultrasonicated in acetone for 15 minutes, then placed in ethanol for 15 minutes, and finally cleaned with deionized water 3 times, after drying naturally at room temperature, it was used as an electrode anode.

[0043] (2) TiO 2 Sol Preparation: Nano TiO 2 Photocatalyst powder and deionized water were mixed at a ratio of 5:1000 (g:mL), fully stirred for 30 minutes, and then placed in an ultrasonic instrument with an ultrasonic frequency of 40 kHz for 15 minutes to obtain TiO 2 Sol.

[0044] (3) Preparation of...

Embodiment 2

[0048] (1) Electrode pretreatment: Clean the nickel foam metal mesh (area size: 100mm×400mm) for 3 times in 1.0mol / L hydrochloric acid, and then ultrasonicate in absolute ethanol (ultrasonic instrument with a frequency of 10kHz) for 100min , and then washed 3 times with deionized water, dried at room temperature and used as electrode cathode; with the same ultrasonic frequency, the graphite sheet was ultrasonicated in acetone for 15 minutes, then placed in ethanol for 15 minutes, and finally washed with deionized water 3 times, after drying naturally at room temperature, it was used as an electrode anode.

[0049] (2) TiO 2 Sol preparation: TiO 2 Photocatalyst powder and deionized water were mixed at a ratio of 5:500 (g:mL), fully stirred for 100 minutes, and then placed in an ultrasonic instrument with an ultrasonic frequency of 10 kHz for 30 minutes to obtain TiO 2 Sol.

[0050] (3) Preparation of supported photocatalyst by electrodeposition: immerse the pretreated nickel...

Embodiment 3

[0053] (1) Electrode pretreatment: Clean the foamed nickel metal mesh (area size: 100mm×400mm) for 3 times in 1.0mol / L hydrochloric acid, and then ultrasonicate in absolute ethanol (ultrasonic instrument with a frequency of 10kHz) 100min, then wash it with deionized water for 3 times, dry it at room temperature and use it as the electrode cathode; use the same ultrasonic frequency, after the graphite sheet is ultrasonicated in acetone for 15min, then put it in ethanol and ultrasonically for 15min, and finally use deionized water After washing 3 times, it was used as the electrode anode after being dried naturally at room temperature.

[0054] (2) TiO 2 Sol preparation: TiO 2 Photocatalyst powder and deionized water were mixed at a ratio of 0.1:200 (g:mL), fully stirred for 100 minutes, and then placed in an ultrasonic instrument with an ultrasonic frequency of 10 kHz for 30 minutes to obtain TiO 2 Sol.

[0055] (3) Preparation of supported photocatalyst by electrodeposition...

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Abstract

The invention discloses a supported photocatalyst as well as a preparation method and an application thereof. The preparation method comprises the following steps of: taking a foam metal net as an electrode cathode; taking a titanium sheet or a graphite sheet as an electrode anode; immersing the electrode cathode and the electrode anode into photocatalyst sol formed by mixing photocatalyst powder with water according to a distance of 1-20 cm; connecting with a 10-150-V stable-voltage direct-current power supply and continually agitating the sol; after electrifying for 1-50 min, stopping electrifying; and taking out cathode foam metal and drying to obtain the supported photocatalyst. The preparation method provided by the invention can rapidly and efficiently realize large amount of uniform load of the photocatalyst on a carrier material; and the obtained supported photocatalyst is not easy to release and is convenient to recycle and repeatedly utilize. The supported photocatalyst disclosed by the invention can be used for effectively and photo-catalytically degrading volatile organic compounds and can be used for purifying indoor or industrial organic waste gas with different concentrations.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a supported photocatalyst and its preparation method and application. Background technique [0002] With the expansion of the scope of human production activities, more and more serious environmental pollution problems have emerged, especially the pollution of volatile organic compounds to the atmospheric environment is very serious, which has attracted more and more people's attention in recent years. Most of these volatile organic compounds are toxic to the human body, and some of them can induce various serious diseases, have carcinogenic or teratogenic effects, and can also photochemically react with nitrogen oxides in the atmosphere to destroy the atmospheric ozone layer. Therefore, the control of volatile organic compounds has become the research focus of atmospheric environmental scientists in recent years and even in the next few decades. [0003] In rec...

Claims

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Application Information

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IPC IPC(8): B01J37/34B01J23/755B01J23/06B01D53/86B01D53/72
CPCY02A50/20
Inventor 安太成何枝贵陈江耀李桂英
Owner 紫科装备股份有限公司
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