Clinoptilolite tuff from Pentalofos (Greece) was mineralogically and chemically characterized and its adsorption properties towards H 2O, CO 2, SO 2 and NH 3 were investigated. Adsorption isotherms at 25°C were determined and analyzed with Langmuir, Freundlich and Dubinin-Astakhov models. The Langmuir equation was found to provide excellent fits in the case of sulphur dioxide and ammonia and a good fit in the case of carbon dioxide. Dubinin-Astakhov equation, based on a pore filling-type mechanism, appears to be a suitable model for water adsorption, which is characterized by condensation phenomena close to saturation pressure. The high affinity of clinoptilolite for strongly polar molecules is confirmed. The use of Pentalofos clinoptilolite-rich tuff in separation of gaseous mixtures of polar and non polar substances is envisaged and evaluated.
Adsorption properties of clinoptilolite-rich tuff from Thrace (northeastern Greece) / Caputo, Domenico; DE GENNARO, Bruno; M., Pansini; Colella, Carmine. - STAMPA. - 140:(2001), pp. 121-129.
Adsorption properties of clinoptilolite-rich tuff from Thrace (northeastern Greece)
DE GENNARO, BRUNO;COLELLA, CARMINE
2001
Abstract
Clinoptilolite tuff from Pentalofos (Greece) was mineralogically and chemically characterized and its adsorption properties towards H 2O, CO 2, SO 2 and NH 3 were investigated. Adsorption isotherms at 25°C were determined and analyzed with Langmuir, Freundlich and Dubinin-Astakhov models. The Langmuir equation was found to provide excellent fits in the case of sulphur dioxide and ammonia and a good fit in the case of carbon dioxide. Dubinin-Astakhov equation, based on a pore filling-type mechanism, appears to be a suitable model for water adsorption, which is characterized by condensation phenomena close to saturation pressure. The high affinity of clinoptilolite for strongly polar molecules is confirmed. The use of Pentalofos clinoptilolite-rich tuff in separation of gaseous mixtures of polar and non polar substances is envisaged and evaluated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
