Determinants of natural zeolite clinoptilolite adsorption capacity for removing NO2

Nabiollah Mansouri; Mohammad reza Massoudinejad; Hasan Asilian; Azadeh Mafreshi

Journal of Kermanshah University of Medical Sciences

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Determinants of natural zeolite clinoptilolite adsorption capacity for removing NO2

Author(s):

Nabiollah Mansouri¹,

Mohammad reza Massoudinejad^2,*,

Hasan Asilian³,

Azadeh Mafreshi¹

1Dept. of Environmental Engineering, School of Environmental and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran

2Dept. of Environmental Health, School of Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran

3Dept. of Accupational Health, School of Medicine, Tarbiat Modares University, Tehran, Iran

Journal of Kermanshah University of Medical Sciences:Vol. 14, issue 3; e79472

Published online:Dec 19, 2010

Article type:Research Article

Received:Nov 02, 2009

Accepted:Mar 09, 2010

How to Cite:Nabiollah MansouriMohammad reza MassoudinejadHasan AsilianAzadeh MafreshiDeterminants of natural zeolite clinoptilolite adsorption capacity for removing NO2.J Kermanshah Univ Med Sci.14(3):e79472.

Abstract

Background: NO2 is a poisonous gas that potential to cause major threat to human being health and the environment, as a result, removing this gas from environment seems to be essential.

Methods: The study aimed to remove this gas from environment using Iranian natural zeolite, clinoptilolite. After crushing and preparing two sizes of 1 and 2 mm zeolite they were activated in 380 to 420 ºC for 20 minutes. NO2 was produced by reaction of copper (Cu) and nitric acid (HNO3) and diluted with enough air to achieve desired concentration. A laboratory reactor set with different concentration of NO2 (20, 30, and, 45 ppm), flows through the zeolite absorbent bed was prepared. Different parameters affected No2 absorption, such as concentration, height, and diameter of zeolite bed, zeolite granulation, and activation temperature were examined.

Results: In different condition, the adsorption range of the zeolite for NO2 was varied from 0.35% W for 2mm granulation and the 20 ppm concentration to 1.5% W using 1mm granulation and 45 ppm concentration of NO2. Activation temperature of 420 ºC for 20 min was the best condition removing NO2. Efficiency of 1mm granulation was higher than 2mm.

Conclusion: Reducing parameters such as height and diameter of zeolite bed decreased but increasing concentration of gas flow increased adsorption capacity of zeolite. Using Iranian zeolite in gas masks still not recommended.

Keywords

nitrogen dioxide

clinoptilolite zeolite

granulation

adsorption capacity

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