With the purpose to evaluate clinoptilolite for possible use in soil amendment strategies as a substitute of naturally occurring clay minerals, a marketed clinoptilolite-rich tuff coming from Anatolia, Turkey, was submitted, after exhaustive treatment with Ca2+ solutions, to exchange tests towards some nutrient or noxious cations. Accordingly, time-dependant and equilibrium data of exchange reactions of Pb2+, Cu2+, Zn2+, Na+, K+ and NH4+ for Ca2+ were collected and the corresponding thermodynamic and kinetic parameters were calculated following standard procedures. Results demonstrated an excellent to good propensity of Ca2+-clinoptilolite for K+, NH4+ and Pb2+ and a moderate affinity for the other three cations. The conclusion was that a Ca2+-rich clinoptilolite tuff can be considered as a good substitute for clay minerals to recover and/or rebuild degraded and depleted soils.
Cation selectivity of a Ca2+ pre-exchanged clinoptilolite tuff / DE GENNARO, Bruno; Aprea, Paolo; F., Pepe; Colella, Carmine. - STAMPA. - 170B:(2007), pp. 2128-2133. (Intervento presentato al convegno From Zeolites to Porous MOF Materials - The 40th Anniversary of International Zeolite Conference tenutosi a Pechino, Cina nel 12-17 agosto 2007) [10.1016/S0167-2991(07)81110-4].
Cation selectivity of a Ca2+ pre-exchanged clinoptilolite tuff
DE GENNARO, BRUNO;APREA, PAOLO;COLELLA, CARMINE
2007
Abstract
With the purpose to evaluate clinoptilolite for possible use in soil amendment strategies as a substitute of naturally occurring clay minerals, a marketed clinoptilolite-rich tuff coming from Anatolia, Turkey, was submitted, after exhaustive treatment with Ca2+ solutions, to exchange tests towards some nutrient or noxious cations. Accordingly, time-dependant and equilibrium data of exchange reactions of Pb2+, Cu2+, Zn2+, Na+, K+ and NH4+ for Ca2+ were collected and the corresponding thermodynamic and kinetic parameters were calculated following standard procedures. Results demonstrated an excellent to good propensity of Ca2+-clinoptilolite for K+, NH4+ and Pb2+ and a moderate affinity for the other three cations. The conclusion was that a Ca2+-rich clinoptilolite tuff can be considered as a good substitute for clay minerals to recover and/or rebuild degraded and depleted soils.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.