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Regeneration method of nano zinc oxide photocatalyst

A nano-zinc oxide and photocatalyst technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of photocatalyst catalytic performance and crystal particles after recovery Problems such as growth and shape changes

Inactive Publication Date: 2009-06-17
DALIAN JIAOTONG UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the roasting process will cause the growth of crystal particles and the change of morphology, which will affect the catalytic performance of the recovered photocatalyst.

Method used

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  • Regeneration method of nano zinc oxide photocatalyst
  • Regeneration method of nano zinc oxide photocatalyst
  • Regeneration method of nano zinc oxide photocatalyst

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Embodiment Construction

[0020] like Figure 1 ~ Figure 3 shown. A recovery method for nano-zinc oxide photocatalyst, comprising regeneration and decomposition process of nano-zinc oxide catalyst, characterized in that it comprises the following steps:

[0021] 1. Pre-place the negative and positive mixed polishing resin with a volume ratio of 1:1 in the regeneration chamber, use the microporous titanium filter electrode, and turn on the power;

[0022] 2. Pump the suspension solution containing invalid low-concentration nano-zinc oxide from the bottom of the regeneration chamber with a large flow rate and discharge the overflow to keep the liquid level stable; the acid produced in the anode chamber and the lye produced in the cathode chamber are also produced by The constant flow pump discharges in time and replenishes tap water with a conductivity of about 200μs / cm to reduce the temperature of the electrode chamber and control the temperature of the regeneration chamber not to exceed 60°C.

[0023...

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Abstract

The invention relates to a method for recovering nanometer zinc oxide photocatalyst, which is characterized in that the method comprises a photocatalyst regeneration process and a separation process, wherein the method comprises the steps of preplacing a negative mixed polished resin and positive mixed polished resin with the volume ratio of 1:1 in a regeneration chamber, using a microporous titanium filter-element electrode, pumping and injecting a supernatant solution containing failure nanometer zinc oxide from the bottom of the regeneration chamber, discharging overflowing solution, performing electrolysis treatment, controlling the temperature not to exceed 60 DEG C, stopping anodic effluent after regeneration is over, controlling entering water flow and electric field intensity till forming a three-phase fluidized bed state, floating up and leading out ultrafine particle catalyst after recovery. The method offers a new way for recovering nanometer zinc oxide by adopting a resin bed applied with an electric field to concentrate low-concentration suspended catalyst and incompletely degrade pollutants.

Description

technical field [0001] The invention relates to a recovery method of a photocatalyst, in particular to a recovery method of a nanometer zinc oxide photocatalyst. Background technique [0002] Zinc oxide is one of the most practical photocatalysts and is known as the "third-generation semiconductor material". The source of nano-zinc oxide is plentiful and cheap, and the visible light catalytic process of its composite structure material has strong vitality and broad market prospects in terms of cost and energy consumption. [0003] In the photocatalytic reaction, nano-zinc oxide will cause catalyst poisoning due to factors such as microcrystalline polymerization and carboxyl intermediate product pollution, but the research on recovery and regeneration methods and analysis technology is seriously lagging behind, and it has become the first step for photocatalytic technology to move from the laboratory to practical application. The main obstacle; secondly, the zinc oxide catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/92B01J23/06B01J38/48
Inventor 朱少敏姜玉玲李积媛李彦生
Owner DALIAN JIAOTONG UNIVERSITY