caa a22 4500 463192133 CHVBK 20180406164912.0 cr unu---uuuuu 170326e20070101xx s 000 0 eng 10.1007/s10973-006-7831-8 doi (NATIONALLICENCE)springer-10.1007/s10973-006-7831-8 Thermalanalysis of tributylammonium montmorillonite and laponite [Elektronische Daten] [D. Ovadyahu, I. Lapides, S. Yariv] Montmorillonite and Laponite loaded with different amounts of tributylammonium cations (TBAH+), up to 40 and 30 mmol, respectively, per 100 g clay, were studied by thermo-XRD-analysis. TBAH-smectites heated at 300 and 420°C exhibited basal spacings of 1.30 and 1.24 nm, attributed to smectite tactoids with low- and high-temperature-stable monolayer charcoals, respectively in the interlayers. DTA-EGA and TG of the TBAH-smectites showed four stages of mass loss labeled A, B, C and D. Stage A below 250°C, accompanied by an endothermic DTA peak, resulted from the dehydration of the clay. Mass loss stages B, C and D, at 250-380, 380-605°C and above 605°C, respectively, accompanied by exothermic DTA peaks, were due to three oxidation steps of the organic matter. In mass loss stage B (first oxidation step) mainly organic hydrogen was oxidized to H2O whereas carbon and nitrogen formed low- and high-temperature-stable charcoals. In stages C and D (second and third oxidation steps) low- and high-temperature- stable charcoals were oxidized, respectively. Dehydroxylation of the smectites occurred together with the second and third oxidation steps. Thermal mass loss at each step was calculated from the TG curves showing that in montmorillonite the percentage of high-temperature-stable charcoal from total charcoal decreased with higher TBAH+ loadings of the clay whereas in Laponite this percentage increased with higher loadings of the clay. Springer-Verlag, 2007 charcoal-smectite complexes nationallicence DTA nationallicence EGA nationallicence Laponite nationallicence montmorillonite nationallicence organo-smectites nationallicence TG nationallicence tributylammonium smectites nationallicence XRD nationallicence Ovadyahu D. The Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel aut Lapides I. The Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel aut Yariv S. The Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 87/1(2007-01-01), 125-134 1388-6150 87:1<125 2007 87 10973 https://doi.org/10.1007/s10973-006-7831-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-7831-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ovadyahu D. The Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel aut NATIONALLICENCE 700 1- Lapides I. The Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel aut NATIONALLICENCE 700 1- Yariv S. The Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 87/1(2007-01-01), 125-134 1388-6150 87:1<125 2007 87 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer