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Preparation method of special active carbon for ammonia adsorption

An activated carbon and ammonia adsorption technology, applied in chemical instruments and methods, gas treatment, membrane technology, etc., can solve the problems of incomplete removal of ammonia gas, cumbersome operation, harsh reaction conditions, etc., achieve good removal effect, simple operation steps, The effect of not easy to detach

Inactive Publication Date: 2015-02-25
NORTHEAST FORESTRY UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These adsorbents generally have defects such as cumbersome operation, harsh reaction conditions, and incomplete removal of ammonia in the adsorption process and effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] After washing the granular activated carbon with water to remove surface dust and impurities, use 150mL of nitric acid solution with a molar concentration of 1mol / L for constant temperature water bath treatment and impregnation for 5h, filter, wash with water until neutral, and dry for later use; take 10.0g of pretreated activated carbon, Add 100mL of ZnCl with a mass fraction of 5.7% 2 The solution was dried naturally at 105°C for 24 hours to obtain modified activated carbon. Take 1.0 g of modified activated carbon in a closed device with an ammonia gas concentration of 50 ppm. When the adsorption equilibrium is reached, the adsorption capacity of ammonia gas is 22.6 mg / g.

Embodiment 2

[0025] After washing the granular activated carbon with water to remove surface dust and impurities, use 150mL of nitric acid solution with a molar concentration of 1mol / L for constant temperature water bath treatment and impregnation for 5h, filter, wash with water until neutral, and dry for later use; take 10.0g of pretreated activated carbon, Add 100mL of ZnCl with a mass fraction of 9.1% 2 The solution was dried naturally at 105°C for 24 hours to obtain modified activated carbon. Take 1.0 g of modified activated carbon in a closed device with an ammonia gas concentration of 50 ppm. When the adsorption equilibrium is reached, the adsorption capacity of ammonia gas is 42.9 mg / g.

Embodiment 3

[0027] After washing the granular activated carbon with water to remove surface dust and impurities, use 150mL of nitric acid solution with a molar concentration of 1mol / L for constant temperature water bath treatment and impregnation for 5h, filter, wash with water until neutral, and dry for later use; take 10.0g of pretreated activated carbon, Add 100mL of ZnCl with a mass fraction of 11.5% 2 The solution was dried naturally at 105°C for 24 hours to obtain modified activated carbon. Take 1.0 g of modified activated carbon in a closed device with an ammonia gas concentration of 50 ppm, and when the adsorption equilibrium is reached, the adsorption capacity of ammonia gas is 75.58 mg / g.

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Abstract

The invention relates to a preparation method of special active carbon for ammonia adsorption. The preparation method is characterized by comprising the following steps: by taking commercial granular active carbon as raw materials, performing acidification pretreatment, then steeping and modifying through metal inorganic salt, washing, filtering, drying and preparing the active carbon material for efficiently adsorbing ammonia gas at room temperature. The operation technology has the main characteristics that the production cost is low, the operations are simple, the industrial batch production is favorably realized, the prepared active carbon has a good adsorption effect on ammonia gas, the modified samples are not easily desorbed at room temperature, and the effect of effectively removing the ammonia gas for long time can be achieved.

Description

Technical field: [0001] The invention relates to a preparation method of activated carbon adsorbent, in particular to a preparation method of special activated carbon for ammonia adsorption. Background technique: [0002] One of the major concerns in the world today is environmental pollution, and environmental pollution caused by the discharge of chemicals has been on the rise in recent years. Ammonia, as a toxic industrial gas, is usually produced by traditional industries such as agriculture, food, food and beverage, rubber industry. The toxic effect of this colorless, pungent gas on the human body is related to its high water solubility. Indeed, ammonia readily reacts with the skin, eyes, and respiratory system to form ammonium hydroxide due to its high compatibility with water. This exothermic reaction can cause thermal injury such as skin burns. ACGIH, the American Conference of Governmental Industrial Hygienists, limits the average concentration of ammonia exposure...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01J20/20B01D53/02B01D2253/102B01D2257/406
Inventor 刘守新李伟张双双刘丽华
Owner NORTHEAST FORESTRY UNIVERSITY
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