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Catalyst for removing formaldehyde in wastewater, preparation method of catalyst and method for removing formaldehyde in wastewater

A catalyst and waste water technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low removal efficiency, large oxidant, and harsh conditions, so as to improve oxidation ability, improve dispersion, avoid The effect of environmental problems

Active Publication Date: 2020-10-09
TAIYUAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the physical method is mainly the adsorption method, which uses some porous particles as an adsorbent to enrich formaldehyde, but this method has high requirements for the adsorbent, which requires a large specific surface area and suitable pore size distribution. In addition, the desorption after adsorption is difficult
The chemical method mainly converts formaldehyde into other non-toxic or low-toxic substances through combustion or oxidation, so as to achieve the purpose of removing formaldehyde. Although the combustion method has high efficiency and thorough removal of formaldehyde, it consumes a lot of energy and is mainly used for high concentration. Formaldehyde removal
The oxidation method currently used requires a large amount of oxidant, or the conditions are relatively harsh (high temperature, high pressure), or the removal efficiency is low

Method used

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  • Catalyst for removing formaldehyde in wastewater, preparation method of catalyst and method for removing formaldehyde in wastewater
  • Catalyst for removing formaldehyde in wastewater, preparation method of catalyst and method for removing formaldehyde in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) According to the mass ratio of nano-tungsten oxide to graphene oxide 7:3, add nano-tungsten oxide with a particle size below 100nm into the graphene oxide solution under stirring, and vacuumize until there is no liquid to prepare a catalyst. The mass fraction of graphene oxide is 30%, and its TEM image is as follows figure 1 shown by figure 1 It can be seen that graphene oxide is basically wrapped on nano-tungsten oxide;

[0022] (2) Adding formaldehyde concentration in the 100mL there-necked flask is the waste water of 500mg / L, then add the catalyzer prepared in the hydrogen peroxide solution and the step (1) that mass fraction is 30% successively, to the hydrogen peroxide final concentration in the above-mentioned waste water The concentration of graphene oxide was 0.4wt%, and the final concentration of graphene oxide was 0.3wt%. Stirring and reacting at 75°C for 2h, and then performing liquid chromatography analysis, the measured formaldehyde conversion rate was...

Embodiment 2

[0024] (1) According to the mass ratio of nano-alumina and graphene oxide of 9:1, add nano-alumina with a particle size below 100nm into the graphene oxide solution under stirring, and vacuumize until there is no liquid to prepare a catalyst. The mass fraction of graphene oxide is 10%;

[0025] (2) Adding formaldehyde concentration in the 100mL there-necked flask is the waste water of 500mg / L, then add the catalyzer prepared in the hydrogen peroxide solution and step (1) that mass fraction is 40% successively, to the hydrogen peroxide final concentration in the above-mentioned waste water The final concentration of graphene oxide was 0.5 wt%, and the reaction was stirred and reacted at 25°C for 24 hours, and then analyzed by liquid chromatography, and the conversion rate of formaldehyde was measured to be 90%.

Embodiment 3

[0027] (1) According to the mass ratio of nano-silica and graphene oxide 19:1, under stirring, nano-silica with a particle size below 100nm is added in the graphene oxide solution, and vacuumized to no liquid to prepare the catalyst. The mass fraction of the catalyst graphene oxide is 5%, and its TEM figure is as follows figure 2 shown by figure 2 It can be seen that graphene oxide is basically wrapped on nano-silica.

[0028] (2) Adding formaldehyde concentration in the 100mL there-necked flask is the waste water of 500mg / L, then add the catalyzer prepared in the hydrogen peroxide solution and the step (1) that mass fraction is 50% successively, to the hydrogen peroxide final concentration in the above-mentioned waste water The final concentration of graphene oxide was 0.05wt%, and the final concentration of graphene oxide was 1wt%. Stirring and reacting at 50°C for 12h, and then performing liquid chromatography analysis, the measured formaldehyde conversion rate was 100%....

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Abstract

The invention relates to a catalyst for removing formaldehyde in wastewater, a preparation method of the catalyst and a method for removing formaldehyde in wastewater, and belongs to the technical field of wastewater treatment. The catalyst is formed by coating nanoparticles with the particle size of below 100 nm with graphene oxide. Nanoparticles with the particle size of below 100 nm in the catalyst can effectively improve the dispersity of graphene oxide in wastewater to guarantee that graphene oxide can be evenly dispersed in a reaction system without sedimentation, so that graphene oxidecan make full contact with formaldehyde and hydrogen peroxide in wastewater, and formaldehyde is efficiently removed. And graphene oxide in the catalyst can improve the oxidation capacity of hydrogenperoxide and can also avoid invalid decomposition of hydrogen peroxide. A hydrogen peroxide solution and the catalyst are sequentially added into formaldehyde-containing wastewater, and a stirring reaction is performed for 2-24 hours at a temperature of 25-75 DEG C. By adopting the method, formaldehyde in the wastewater can be effectively removed, the environmental problem caused by taking inorganic acid or alkali as the catalyst in the prior art is solved, and the method is environment-friendly, safe and non-toxic.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a catalyst for removing formaldehyde in waste water, a preparation method thereof and a method for removing formaldehyde in waste water. Background technique [0002] Formaldehyde is highly toxic and has been identified as a teratogenic and mutagenic substance by the World Health Organization and a carcinogen by the World Cancer Society. At present, the treatment methods of formaldehyde include: physical method, chemical method and biochemical method. Among them, the physical method is mainly the adsorption method, which uses some porous particles as an adsorbent to enrich formaldehyde, but this method has high requirements for the adsorbent, which requires a large specific surface area and suitable pore size distribution. In addition, the desorption after adsorption is difficult. The chemical method mainly converts formaldehyde into other non-toxic or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J21/18B01J21/04B01J29/40B82Y30/00B82Y40/00C02F1/72C02F101/34
CPCB01J23/30B01J21/18B01J21/04B01J29/40B82Y30/00B82Y40/00C02F1/725C02F1/722C02F2101/34B01J35/23B01J35/40
Inventor 马庆国牛宇岚赵晓红程雪松常西亮
Owner TAIYUAN INST OF TECH
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