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Catalyst for promoting oxidation of formaldehyde in wastewater and preparation method thereof

A catalyst and waste water technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the untargeted oxidation of formaldehyde, waste of chemicals, and increase the risk of accidents And other issues

Pending Publication Date: 2021-05-11
上海玉畔环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a catalyst for promoting the oxidation of formaldehyde in wastewater to solve the following problems in the existing catalytic oxidation technology: (1) formaldehyde cannot be oxidized in a targeted manner, and the added oxidizing agent simultaneously oxidizes organic matter that does not need to be oxidized, Caused waste of chemicals; (2) The reaction conditions are harsh, such as high temperature, high pressure, strong ultraviolet radiation, strong acid and other conditions, which need to consume a lot of energy and increase the risk of accidents; (3) The reaction has hazardous solid waste generation or pollution The generation of toxic waste gas has caused secondary pollution; the above points have resulted in high investment and operating costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A catalyst for promoting the oxidation of formaldehyde in wastewater, comprising: silicon dioxide, manganese dioxide, nano-iron, calcium sulfate, silver powder, the mass ratio of these components is 1:1.9:2.5:0.9:0.006;

[0015] The preparation process is as follows: (1) mix the silicon dioxide, manganese dioxide, nano-iron, calcium sulfate, and silver powder weighed in proportion, and melt at 1600 ° C; (2) cool to 540 ° C, pour into the mold to condense Nucleation; (3) When the temperature of the surface layer drops to 270°C, water at 10°C is poured, and the inside of the catalyst is broken down into holes by the instant vaporization of the soaked water, and the coefficients of thermal expansion and contraction of each internal component are different. Under instantaneous cooling, various fine lines will be cracked, and these physical effects will provide the internal surface area of ​​the catalyst, thereby increasing the reaction contact area of ​​the catalyst, and obt...

Embodiment 2

[0018] A catalyst for promoting the oxidation of formaldehyde in wastewater, comprising: silicon dioxide, manganese dioxide, nano-iron, calcium sulfate, silver powder, the mass ratio of these components is: 1:1.8:2.4:0.8:0.005;

[0019] The preparation process is as follows: (1) mix the silicon dioxide, manganese dioxide, nano-iron, calcium sulfate, and silver powder weighed in proportion, and melt at 1700 ° C; (2) cool to 570 ° C, pour into the mold to condense Nucleation; (3) Sprinkle water at 5°C when the surface temperature drops to 290°C, and use the instantaneous vaporization of the soaked water to break down the inside of the catalyst to form holes, and use the different thermal expansion and contraction coefficients of the internal components to form pores. Under instantaneous cooling, various fine lines will be cracked, and these physical effects can be used to provide the internal surface area of ​​the catalyst, thereby increasing the reaction contact area of ​​the ca...

Embodiment 3

[0022] A catalyst for promoting the oxidation of formaldehyde in wastewater, including: silicon dioxide, manganese dioxide, nano-iron, calcium sulfate, silver powder, the mass ratio of these components is 1:2:2.6:0.9:0.006;

[0023] The preparation process is as follows: (1) mix the silicon dioxide, manganese dioxide, nano-iron, calcium sulfate, and silver powder weighed in proportion, and melt at 1800 ° C; (2) cool to 580 ° C, pour into the mold to condense Nucleation; (3) Sprinkle water at 8°C when the surface temperature drops to 300°C, and use the instantaneous vaporization of the soaked water to break down the inside of the catalyst to form holes, and use the different coefficients of thermal expansion and contraction of the internal components to form holes in the catalyst. Under instantaneous cooling, various fine lines will be cracked, and these physical effects can provide the internal surface area of ​​the catalyst, thereby increasing the reaction contact area of ​​th...

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Abstract

The invention provides a catalyst for promoting oxidation of formaldehyde in wastewater and a preparation method thereof. The catalyst comprises silicon dioxide, manganese dioxide, nanometer iron, calcium sulfate and silver powder in a mass ratio of 1: (1.8-2.2): (2.4-2.8): (0.8-1.2): (0.005-0.008). The catalyst is solid porous particles with particle sizes in a range of 5-10 mm. Under the conditions of normal temperature and normal pressure, the catalyst can react with hydrogen peroxide to generate superoxide free radicals, the oxidation rate of formaldehyde in wastewater can reach 99.9% or above, but the oxidation rate of other organic matters in the wastewater is less than 1%, so formaldehyde is selectively removed, chemical waste is not caused, solid waste and waste gas are not generated, and secondary pollution is avoided; and meanwhile, the catalyst has no chemical property change at the beginning and the end of the catalytic oxidation reaction, the performance cannot be attenuated, and the catalyst can be repeatedly used for a long time.

Description

technical field [0001] The invention belongs to the field of organic chemical wastewater treatment, and in particular relates to a catalyst for promoting the oxidation of formaldehyde in wastewater and a preparation method thereof. Background technique [0002] Formaldehyde is biologically toxic. When the formaldehyde content of wastewater is higher than 200mg / L, it is difficult to treat it well by biological methods. It is necessary to pretreat the formaldehyde in wastewater. At present, there are many ways to pretreat formaldehyde by catalytic oxidation technology, such as: iron-carbon micro-electrolysis, Fenton oxidation, ozone activated carbon catalytic oxidation, wet oxidation, photocatalytic oxidation, etc. Although these methods can oxidize formaldehyde in wastewater, all organic matter in wastewater must be oxidized simultaneously to remove formaldehyde. However, oxidizing those organic substances that do not need to be oxidized will consume most of the chemicals an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/055B01J23/89B01J35/02C02F1/72C02F101/34
CPCB01J27/055B01J23/8986C02F1/722C02F2101/34B01J35/50B01J35/40
Inventor 杨如清
Owner 上海玉畔环保科技有限公司
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