Nano cerium manganese oxide/activated carbon composite material for room temperature oxidation of formaldehyde and preparation method thereof

A technology of composite materials and oxides, applied in the field of nano-cerium manganese oxide/activated carbon composite materials and its preparation, can solve the problems of easy detachment and deactivation, low loading capacity, poor binding force, etc., to improve hydrophobic performance and prevent agglomeration , the effect of increasing the load

Inactive Publication Date: 2018-10-09
贾玉玺
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The addition of noble metals in the catalyst increases the cost, and it is difficult for noble metals and metal oxides to disperse evenly on the surface of activated carbon, resulting in low loading, poor binding force, and easy to fall off and deactivate during repeated use. Catalyst Common Defects

Method used

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  • Nano cerium manganese oxide/activated carbon composite material for room temperature oxidation of formaldehyde and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0050] The preparation method of this embodiment is as follows:

[0051] Screen coconut shell granular activated carbon (1000mg / g iodine value) with mesh number 80-150, soak it in the mixed solution of 65-70wt% nitric acid and 98wt% sulfuric acid, and pretreat it at 80°C for 4h. After filtration, wash with deionized water several times until the pH is between 6 and 7, and dry in an oven at 120°C for 8 hours.

[0052] Get above-mentioned pretreated activated carbon 100g and polyvinylpyrrolidone 25g and add into deionized water under stirring (1000r / min). Then add 16g of melamine, stir at room temperature for 1 hour, and then ultrasonically treat at 60°C for 3 hours to obtain a brown gel. After standing for 1 hour, filter off the supernatant, wash with distilled water for 3 to 5 times, and transfer to an oven at 100°C after filtering. 1h to get xerogel. Then calcined in a muffle furnace at 500°C for 3h, and cooled to room temperature to obtain modified activated carbon particl...

Embodiment 2

[0055] The preparation method of this embodiment is as follows:

[0056] Coal-based granular activated carbon with a mesh number of 80-150 (iodine value 1200mg / g) was screened, soaked in a mixed solution of 65-70wt% nitric acid and 98wt% sulfuric acid, and pretreated at 80°C for 4 hours. After filtration, wash with deionized water several times until the pH is between 6 and 7, and dry in an oven at 120°C for 8 hours.

[0057] Take 100 g of the above-mentioned pretreated activated carbon and 20 g of polyethyleneimine and add them into deionized water under stirring (1000 r / min). Then add 16g of urea, stir at room temperature for 1 hour, and then ultrasonically treat at 60°C for 3 hours to obtain a brown gel. After standing for 1 hour, filter off the supernatant, wash with distilled water for 3 to 5 times, and transfer to an oven at 100°C after filtering. 1h to get xerogel. Then calcined in a muffle furnace at 500°C for 3h, and cooled to room temperature to obtain modified act...

Embodiment 3

[0060] Screen coconut shell granular activated carbon (1000mg / g iodine value) with mesh number 80-150, soak it in the mixed solution of 65-70wt% nitric acid and 98wt% sulfuric acid, and pretreat it at 80°C for 4h. After filtration, wash with deionized water several times until the pH is between 6 and 7, and dry in an oven at 120°C for 8 hours.

[0061] Get the above-mentioned pretreated activated carbon 100g and acrylic acid maleic anhydride copolymer 25g and add them into deionized water under stirring (1000r / min). Then add 20g of biuret, stir at room temperature for 1 hour, and then ultrasonically treat at 60°C for 3 hours to obtain a brown gel. After standing for 1 hour, filter off the supernatant, wash with distilled water for 3 to 5 times, and transfer to 100°C after filtration. Dry gel was obtained in oven for 1h. Then calcined in a muffle furnace at 500°C for 2h, and cooled to room temperature to obtain modified activated carbon particles.

[0062] 1.58g KMnO 4 (0.01...

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Abstract

The invention provides a nano cerium manganese oxide / activated carbon composite material for oxidation of formaldehyde at room temperature and a preparation method thereof. The method includes: firstly subjecting activated carbon to acid treatment, then using a nitrogen-containing compound to perform nitrogen doping treatment, conducting sol-gel heat treatment, then introducing nitrogen element tothe activated carbon surface to obtain mesoporous activated carbon and increase the surface polarity of activated carbon greatly at the same time, and then loading a nano cerium manganese oxide evenly and stably on the activated carbon surface by in-situ co-precipitation method. Compared with the existing catalysts, the nano cerium manganese oxide / activated carbon composite material can expose more active sites, and has good hydrophobic properties, improves the catalytic oxidation activity of formaldehyde, can be used directly or used after simple molding, is used for the air purification field, domain. The preparation method has the advantages of simple steps, convenient operation, and strong practicality.

Description

technical field [0001] The invention belongs to the field of air purification for catalytic oxidation of formaldehyde, in particular to a nano-cerium manganese oxide / activated carbon composite material capable of oxidizing formaldehyde at room temperature and a preparation method thereof. Background technique [0002] In recent years, air pollution has become a major problem facing the society and needs to be solved urgently. PM2.5 has become one of the most important outdoor factors threatening human health, while formaldehyde has become the most important indoor air pollutant. Formaldehyde is highly toxic. When it accumulates to a certain concentration, it will cause allergic reactions in the respiratory system and nervous system. Long-term exposure to low concentrations of formaldehyde will greatly increase the probability of carcinogenesis. Formaldehyde is ubiquitous in life. Decoration materials and building decorations are the main source of indoor formaldehyde, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/03B01D53/86B01D53/72
CPCB01D53/8668B01J27/24B01J35/006B01J35/0073B01J37/03B01J37/036
Inventor 贾玉玺王晓徐永正张雷达陈忠丽刘大河
Owner 贾玉玺
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