Adsorption and microcalorimetric investigations ofn-butylamine intercalation in α- and γ-zirconium phosphates |
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Authors: | I Dékány L Szirtes |
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Institution: | (1) Institute of Colloid Chemistry, Attila József University, Szeged, (Hungary);(2) Institute of Isotopes of the Hungarian Academy of Sciences, P.O.B. 77, H-1525 Budapest, (Hungary) |
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Abstract: | The intercalation process ofn-butylamine was investigated. The adsorption ofn-butylamine in interlamellar space had stepwise character in case of both crystalline forms of zirconium phosphate. The intercalatedn-butylamine existed at low concentration as bilayered complex. The reaction heat was determined by a microcalorimetric method. It was found that about 90% of it refers to the neutralization ofn-butylamine and only about 10% is related with surface adsorption (ion exchange). The steps of adsorption are 6.0 J/g and 1.0 J/g reaction heat values, respectively. The enthalpy balance of total process in dilute solution system (c
0=3.0 vol%) is 14.67 kJ/mol. The calculated value for ion adsorption (exchange) was 1.37 kJ/mol. |
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