Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 94: Issue 3
Thermal behavior and water adsorption of natural and modified sepiolite having dolomite from Turkey
Authors:
B. Egrdoğan Alver Anadolu University Department of Physics, Science Faculty 26470 Eskisehir Turkey

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M. Sakici Anadolu University Department of Physics, Science Faculty 26470 Eskisehir Turkey

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E. Yörükoğullari Anadolu University Department of Physics, Science Faculty 26470 Eskisehir Turkey

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Y. Yilmaz Anadolu University Graduate School of Science 26470 Eskisehir Turkey

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M. Güven Anadolu University Graduate School of Science 26470 Eskisehir Turkey

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Pages:
835–840
Online Publication Date:
20 Sep 2008
Publication Date:
01 Dec 2008
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-008-9032-0
Keywords:
adsorption; dehydration; sepiolite; thermal analysis; water vapor; XRD
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Abstract  

The water adsorption properties of sepiolite having dolomite supplied from Eskisehir region and their exchanged forms (K+, Na+, Mg2+ and Ca2+) were investigated. The sepiolite samples were characterized using XRD, TG-DTA, DSC and nitrogen adsorption methods. The temperature ranges were determined for the dehydrations of hydroscopic and zeolitic water as 30–200°C, for the dehydration of the bound water as 250–750°C and for the dehydroxylation of hydroxyls as 810–850°C in the sample. It was observed that the value of percent mass loss for natural and modified samples varied in the range from 36.70 to 39.05%. Two mass loss steps for all samples were observed using a differential scanning calorimetry (DSC) in the range of 30–550°C. Adsorption isotherms for water on natural and modified forms were obtained at pressures up to 2.39 kPa. Uptake of water increased as K-SEP.<Na-SEP.<Mg-SEP.<Ca-SEP. for sepiolite samples at 293 K.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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