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On-line regeneration method of spent photocatalyst

A technology of photocatalyst and photocatalytic film, applied in the direction of catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as complex processes, achieve efficient regeneration methods, improve regeneration efficiency, and promote regeneration effect of effect

Inactive Publication Date: 2009-11-18
HARBIN INST OF TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing invalid photocatalyst regeneration method has complicated process and needs to take out the photocatalyst from the photocatalytic reactor, the present invention further provides an online regeneration method for the invalid photocatalyst

Method used

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specific Embodiment approach 1

[0007] Specific embodiment one: the on-line regeneration method of the exhausted photocatalyst described in this embodiment is carried out according to the following steps: one, after the photocatalyst (gradually) fails in the operation process of the photocatalytic film combination process, stop the inflow of raw water, and utilize The membrane module discharges a part of the solution in the photocatalytic membrane reactor, and stops the water outlet when the liquid level of the solution in the photocatalytic membrane reactor is at two-thirds of the membrane module; 2. Pass into the photocatalytic membrane reactor The regeneration liquid is used to remove the adsorbed substances on the surface of the catalyst, and the hydraulic retention time of the regeneration liquid in the photocatalytic membrane reactor is controlled to be 10min to 480min; 3. The light source intensity of the ultraviolet light source is controlled to be 0.1 to 20mW / cm 2 for regeneration by UV irradiation. ...

specific Embodiment approach 2

[0009] Specific implementation mode two: In this embodiment mode, in step one, the photocatalyst is TiO 2 powder. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0010] Specific embodiment three: In step one of this embodiment, the regeneration liquid is distilled water. The use of distilled water as the regeneration solution is because the distilled water does not contain other substances, which can prevent the deposition of other substances during the regeneration process, and can reduce the concentration of pollutants in the mixed solution, which is beneficial to the degradation of the substances deposited on the surface of the catalyst. Ineffective TiO after degrading natural organic matter 2 for regeneration, H 2 o 2 Under the condition of the concentration of 0.05mM, the regeneration rate was 42%. Other steps are the same as in the first embodiment.

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Abstract

The invention discloses an on-line regeneration method of spent photocatalyst, relating to a regeneration method of spent photocatalyst. The invention solves the problems that the existing regeneration method of spent photocatalyst has complicated technique, and photocatalyst needs to be extracted from a photocatalytic reactor. The regeneration method of the invention is that: 1.after photocatalyst (gradually) loses effectiveness in the process of using photocatalytic membrane combined technique, raw water penetration stops, a membrane module is used for discharging parts of solution in a photocatalytic membrane reactor, and water discharge stops when liquid level of solution in the photocatalytic membrane reactor is as high as two thirds of the membrane module; 2. regeneration liquid is led into the photocatalytic membrane reactor to remove substance absorbed on the surface of photocatalyst, and hydraulic retention time of the regeneration liquid in the photocatalytic membrane reactor is controlled to be 10-480min; and 3. the intensity of ultraviolet light source is controlled to be 0.1-20mW / cm so as to perform ultra-vioket radiation regeneration. The invention has high regeneration efficiency, does not need to extract photocatalyst from a photocatalytic reactor, can realize on-line regeneration of photocatalyst and has simple operation.

Description

technical field [0001] The invention relates to a regeneration method of a spent photocatalyst. Background technique [0002] Photocatalysis is a promising new technology for water treatment. Because it can use sunlight or ultraviolet light to degrade a variety of pollutants, it has broad application prospects. But TiO 2 The poisoning of photocatalysts is one of the key problems faced by the practical application of photocatalytic technology, and the poisoning mechanisms of reactants with different structures and physical and chemical properties are also different. The research results show that most of the photocatalysts have reaction by-products or intermediate products adsorbed on the surface of the catalyst when they are deactivated. This phenomenon is essentially due to the fact that certain adsorbates are preferentially adsorbed on the active site of the catalyst, or form a particularly strong chemical adsorption bond, or chemically react with the active center, caus...

Claims

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Application Information

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IPC IPC(8): B01J38/00B01J38/48B01J21/06B01J38/64B01J38/60
Inventor 于水利严晓菊时文歆李力争
Owner HARBIN INST OF TECH
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