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Preparation method for activated carbon special for removal of low-concentration formaldehyde in room

An activated carbon, low-concentration technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of cumbersome operation, incomplete removal of formaldehyde, and high cost of modification reagents, and achieve simple operation steps, low price, and easy control. Effect

Inactive Publication Date: 2014-05-07
NORTHEAST FORESTRY UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has defects such as cumbersome operation, high cost of modifying reagents, and incomplete removal of formaldehyde.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] After washing the activated carbon with water to remove surface dust and impurities, use a nitric acid solution with a mass concentration of 3% to oscillate and impregnate in a constant temperature water bath for 24 hours, filter, wash with water until neutral, and dry for later use; take 5g of pretreated activated carbon and add it to the molar concentration 0.1mol / L CuCl 2 The solution was shaken in a water bath at room temperature for 24 hours, filtered, washed with water until neutral, dried, and placed in N 2 Calcined at 500°C for 2 hours under protection to prepare modified activated carbon. Using the same treatment method, CuCl 2 Modified activated carbon with a concentration of 0.3mol / L, 0.5mol / L, 1.0mol / L, 1.5mol / L, and 2.5mol / L. Take 0.1g of modified activated carbon prepared at different concentrations in a closed device with a formaldehyde concentration of 20ppm, and the penetration time of formaldehyde is measured to be 1.5h, 2.0h, 5.5h, 4.0h, 3.3h, 3.0 ...

Embodiment 2

[0025] After washing the activated carbon with water to remove surface dust and impurities, use a nitric acid solution with a mass concentration of 3% to oscillate and impregnate in a constant temperature water bath for 24 hours, filter, wash with water until neutral, and dry for later use; take 5g of pretreated activated carbon and add it to the molar concentration 0.1mol / L ZnCl 2 The solution was shaken in a water bath at room temperature for 24 hours, filtered, washed with water until neutral, dried, and placed in N 2 Calcined at 500°C for 2 hours under protection to prepare modified activated carbon. Take 0.1g of modified activated carbon in a closed device with a formaldehyde concentration of 20ppm. It is determined that the breakthrough time for formaldehyde adsorption is 3.0h, and the highest removal rate of formaldehyde is 85%.

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Abstract

The invention discloses a preparation method for activated carbon special for the removal of low-concentration formaldehyde in a room. The preparation method is characterized by comprising the following steps of pre-treating commercial activated carbon serving as a raw material, and performing modification, washing, filtering and drying to prepare an activated carbon material for removing the formaldehyde at room temperature. The obtained modified activated carbon is high in low-concentration formaldehyde removal efficiency, low in cost and easy to operate; when the concentration of the formaldehyde is 20ppm, 85 to 95 percent of formaldehyde can be adsorbed by the material.

Description

Technical field: [0001] The invention relates to a preparation method of an activated carbon adsorbent, in particular to a preparation method of a special activated carbon for indoor low-concentration formaldehyde removal. Background technique: [0002] In newly renovated houses and workplaces, harmful gas pollution, especially formaldehyde gas, caused by the extensive use of a large number of panel furniture and decorative materials poses a serious threat to human survival and health. Formaldehyde is a colorless gas with a strong pungent smell, which can bind to proteins. After inhalation of high concentrations of formaldehyde, there will be severe respiratory tract irritation, edema, eye stinging, headache and other adverse reactions, which can be life-threatening in severe cases. The formaldehyde released in decoration materials mainly comes from adhesives and paints, which have poor volatility and can be released slowly for more than ten years. Therefore, it is of great ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/04
Inventor 刘守新李伟张双双李凌云王璐瑶张馨月王圣琦
Owner NORTHEAST FORESTRY UNIVERSITY
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