TY - JOUR
T1 - Adsorption of N2, No2 and Co2 on epistilbite natural zeolite from Jalisco, Mexico after acid treatment
AU - Hernández-Espinosa, Miguel Angel
AU - Quiroz-Estrada, Karla
AU - Petranovskii, Vitalii
AU - Rojas, Fernando
AU - Portillo, Roberto
AU - Salgado, Martha Alicia
AU - Marcelo, Miguel
AU - Rubio, Efraín
AU - Felipe, Carlos
N1 - Publisher Copyright:
© 2018 by the author. Licensee MDPI, Basel, Switzerland.
PY - 2018/5
Y1 - 2018/5
N2 - Emissions of carbon dioxide (CO2) and nitrogen dioxide (NO2) in recent years has been increased considerably. One way to reduce the concentration of these greenhouse gases in the atmosphere is adsorptive capture. This paper describes the main results of adsorption of N2, NO2, and CO2 on epistilbite, both natural and on samples that were chemically treated at various concentrations of HCl. Data on the adsorption of CO2 and NO2 were evaluated by the Freundlich and Langmuir equations. Additionally, the thermodynamic parameters of adsorption were calculated, including the degree of interaction of the zeolite samples with gases by gradually changing the isosteric heat capacities of adsorption. The acid treatment improves the adsorption capacity of epistilbite with respect to NO2 and CO2, due the replacement of large extra-framework cation by small H+ ions. The improvement in the distribution of pore sizes in epistilbite samples was calculated by the method of Barrett-Joyner-Halenda. The sample H1 that was prepared in a moderately concentrated acid showed the best behavior in the CO2 adsorption processes, while the natural EPIN material preferably adsorbs NO2.
AB - Emissions of carbon dioxide (CO2) and nitrogen dioxide (NO2) in recent years has been increased considerably. One way to reduce the concentration of these greenhouse gases in the atmosphere is adsorptive capture. This paper describes the main results of adsorption of N2, NO2, and CO2 on epistilbite, both natural and on samples that were chemically treated at various concentrations of HCl. Data on the adsorption of CO2 and NO2 were evaluated by the Freundlich and Langmuir equations. Additionally, the thermodynamic parameters of adsorption were calculated, including the degree of interaction of the zeolite samples with gases by gradually changing the isosteric heat capacities of adsorption. The acid treatment improves the adsorption capacity of epistilbite with respect to NO2 and CO2, due the replacement of large extra-framework cation by small H+ ions. The improvement in the distribution of pore sizes in epistilbite samples was calculated by the method of Barrett-Joyner-Halenda. The sample H1 that was prepared in a moderately concentrated acid showed the best behavior in the CO2 adsorption processes, while the natural EPIN material preferably adsorbs NO2.
KW - Adsorption
KW - Carbon dioxide
KW - Epistilbite
KW - Sequestration
UR - http://www.scopus.com/inward/record.url?scp=85047911087&partnerID=8YFLogxK
U2 - 10.3390/min8050196
DO - 10.3390/min8050196
M3 - Artículo
SN - 2075-163X
VL - 8
JO - Minerals
JF - Minerals
IS - 5
M1 - 196
ER -