Thermal Behavior of a Natural Sepiolite from Northeastern Iran
Sepiolite deposits have been recently discovered in northeastern Iran. However, there is still little information about its physicochemical and mineralogical characteristics. Therefore, the collapse of the sepiolite (with sizes of < 63 μm) structure induced by temperature elevation in an electric...
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University of Tehran
2013-06-01
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| Series: | Journal of Sciences, Islamic Republic of Iran |
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| Online Access: | https://jsciences.ut.ac.ir/article_32079_cd5d5e8f5495ae3b3801827a36d7e309.pdf |
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| author | S. Hojati H. Khademi |
| author_facet | S. Hojati H. Khademi |
| author_sort | S. Hojati |
| collection | DOAJ |
| description | Sepiolite deposits have been recently discovered in northeastern Iran. However, there is still little information about its physicochemical and mineralogical characteristics. Therefore, the collapse of the sepiolite (with sizes of < 63 μm) structure induced by temperature elevation in an electric furnace at 350, 550, and 850 °C for 4 hours was studied using X-ray diffraction (XRD) in combination with Thermogravimetric analysis (TGA) and infrared spectroscopic analysis. Results showed that the main mineral constituent of the samples is a well crystallized sepiolite. However, dolomite and quartz were also present in minor amounts. Results also revealed that with temperature different phases including ‘sepiolite dihydrite’, ‘sepiolite anhydrite’ and ‘enstatite’ were formed, as magnesium coordinated water and octahedrically coordinated hydroxyl groups, were eliminated and the dehydroxylated phase was recrystallized to enstatite, a stable form of magnesium silicate (MgSiO3). |
| format | Article |
| id | doaj-art-a596dc1b130c40018891e455e5f3b7da |
| institution | OA Journals |
| issn | 1016-1104 2345-6914 |
| language | English |
| publishDate | 2013-06-01 |
| publisher | University of Tehran |
| record_format | Article |
| series | Journal of Sciences, Islamic Republic of Iran |
| spelling | doaj-art-a596dc1b130c40018891e455e5f3b7da2025-08-20T02:25:53ZengUniversity of TehranJournal of Sciences, Islamic Republic of Iran1016-11042345-69142013-06-0124212913432079Thermal Behavior of a Natural Sepiolite from Northeastern IranS. Hojati0H. Khademi1Department of Soil Science, College of Agriculture, Shahid Chamran University, Ahvaz 6135783151, Khuzestan, Islamic Republic of IranDepartment of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan 8415683111, Isfahan, Islamic Republic of IranSepiolite deposits have been recently discovered in northeastern Iran. However, there is still little information about its physicochemical and mineralogical characteristics. Therefore, the collapse of the sepiolite (with sizes of < 63 μm) structure induced by temperature elevation in an electric furnace at 350, 550, and 850 °C for 4 hours was studied using X-ray diffraction (XRD) in combination with Thermogravimetric analysis (TGA) and infrared spectroscopic analysis. Results showed that the main mineral constituent of the samples is a well crystallized sepiolite. However, dolomite and quartz were also present in minor amounts. Results also revealed that with temperature different phases including ‘sepiolite dihydrite’, ‘sepiolite anhydrite’ and ‘enstatite’ were formed, as magnesium coordinated water and octahedrically coordinated hydroxyl groups, were eliminated and the dehydroxylated phase was recrystallized to enstatite, a stable form of magnesium silicate (MgSiO3).https://jsciences.ut.ac.ir/article_32079_cd5d5e8f5495ae3b3801827a36d7e309.pdfsepioliteenstatitezeolitic waterinfrared spectroscopy |
| spellingShingle | S. Hojati H. Khademi Thermal Behavior of a Natural Sepiolite from Northeastern Iran Journal of Sciences, Islamic Republic of Iran sepiolite enstatite zeolitic water infrared spectroscopy |
| title | Thermal Behavior of a Natural Sepiolite
from Northeastern Iran |
| title_full | Thermal Behavior of a Natural Sepiolite
from Northeastern Iran |
| title_fullStr | Thermal Behavior of a Natural Sepiolite
from Northeastern Iran |
| title_full_unstemmed | Thermal Behavior of a Natural Sepiolite
from Northeastern Iran |
| title_short | Thermal Behavior of a Natural Sepiolite
from Northeastern Iran |
| title_sort | thermal behavior of a natural sepiolite from northeastern iran |
| topic | sepiolite enstatite zeolitic water infrared spectroscopy |
| url | https://jsciences.ut.ac.ir/article_32079_cd5d5e8f5495ae3b3801827a36d7e309.pdf |
| work_keys_str_mv | AT shojati thermalbehaviorofanaturalsepiolitefromnortheasterniran AT hkhademi thermalbehaviorofanaturalsepiolitefromnortheasterniran |