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פותח על ידי קלירמאש פתרונות בע"מ -
Thermal analyis of hexadecyltrimethylammonium-montmorillonites: Part 1. Thermogravimetry, carbon and hydrogen analysis and thermo-IR spectroscopy analysis
Year:
2011
Authors :
בוריסובר, מיכאל
;
.
Volume :
105
Co-Authors:
Lapides, I., Institute of Chemistry, Hebrew University of Jerusalem, Campus Edmund Y. Safra, Jerusalem 91904, Israel
Borisover, M., Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, POB 6, Bet Dagan 50250, Israel
Yariv, S., Institute of Chemistry, Hebrew University of Jerusalem, Campus Edmund Y. Safra, Jerusalem 91904, Israel
Facilitators :
From page:
921
To page:
929
(
Total pages:
9
)
Abstract:
Na-montmorillonite (Na-MONT) was loaded with hexadecyltrimethylammonium cations (HDTMA) by replacing 41 and 90% of the exchangeable Na with HDTMA, labeled OC-41 and OC-90, respectively. Na-MONT, OC-41, and OC-90 were heated in air up to 900 °C. Unheated and thermally treated organoclays heated at 150, 250, 360, and 420 °C are used in our laboratory as sorbents of different hazardous organic compounds from waste water. In order to get a better knowledge about the composition and nature of the thermally treated organoclays Na-MONT and the two organo-clays were studied by thermogravimetry (TG) in air and under nitrogen. Carbon and hydrogen contents in each of the thermal treated sample were determined and their infrared spectra were recorded. The present results showed that at 150 °C both organoclays lost water but not intercalated HDTMA cations. At 250 °C, many HDTMA cations persisted in OC-41, but in OC-90 significant part of the cations were air-oxidized into H2O and CO2 and the residual carbon formed charcoal. After heating both samples at 360 °C charcoal was present in both organo clays. This charcoal persisted at 420 °C but was gradually oxidized by air with further rise in temperature. TG runs under nitrogen showed stepwise degradation corresponding to interlayer water desorption followed by decomposition of the organic compound, volatilization of small fragments and condensation of non-volatile fragments into quasi-charcoal. After dehydroxylation of the clay the last stages of organic matter pyrolysis and volatilization occurred. © 2011 Akadémiai Kiadó, Budapest, Hungary.
Note:
Related Files :
Clay minerals
Hazardous organic compounds
Last stage
Na-montmorillonite
Organo- montmorillonite
sewage
Wastewater
עוד תגיות
תוכן קשור
More details
DOI :
10.1007/s10973-011-1304-4
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר מתוך כינוס
;
.
Language:
אנגלית
Editors' remarks:
ID:
24050
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:04
Scientific Publication
Thermal analyis of hexadecyltrimethylammonium-montmorillonites: Part 1. Thermogravimetry, carbon and hydrogen analysis and thermo-IR spectroscopy analysis
105
Lapides, I., Institute of Chemistry, Hebrew University of Jerusalem, Campus Edmund Y. Safra, Jerusalem 91904, Israel
Borisover, M., Institute of Soil, Water and Environmental Sciences, Volcani Center, Agricultural Research Organization, POB 6, Bet Dagan 50250, Israel
Yariv, S., Institute of Chemistry, Hebrew University of Jerusalem, Campus Edmund Y. Safra, Jerusalem 91904, Israel
Thermal analyis of hexadecyltrimethylammonium-montmorillonites: Part 1. Thermogravimetry, carbon and hydrogen analysis and thermo-IR spectroscopy analysis
Na-montmorillonite (Na-MONT) was loaded with hexadecyltrimethylammonium cations (HDTMA) by replacing 41 and 90% of the exchangeable Na with HDTMA, labeled OC-41 and OC-90, respectively. Na-MONT, OC-41, and OC-90 were heated in air up to 900 °C. Unheated and thermally treated organoclays heated at 150, 250, 360, and 420 °C are used in our laboratory as sorbents of different hazardous organic compounds from waste water. In order to get a better knowledge about the composition and nature of the thermally treated organoclays Na-MONT and the two organo-clays were studied by thermogravimetry (TG) in air and under nitrogen. Carbon and hydrogen contents in each of the thermal treated sample were determined and their infrared spectra were recorded. The present results showed that at 150 °C both organoclays lost water but not intercalated HDTMA cations. At 250 °C, many HDTMA cations persisted in OC-41, but in OC-90 significant part of the cations were air-oxidized into H2O and CO2 and the residual carbon formed charcoal. After heating both samples at 360 °C charcoal was present in both organo clays. This charcoal persisted at 420 °C but was gradually oxidized by air with further rise in temperature. TG runs under nitrogen showed stepwise degradation corresponding to interlayer water desorption followed by decomposition of the organic compound, volatilization of small fragments and condensation of non-volatile fragments into quasi-charcoal. After dehydroxylation of the clay the last stages of organic matter pyrolysis and volatilization occurred. © 2011 Akadémiai Kiadó, Budapest, Hungary.
Scientific Publication
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