کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1696769 1519143 2006 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ethylene glycol intercalation in MgAlCO3 hydrotalcite and its low-temperature intermediate phases
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Ethylene glycol intercalation in MgAlCO3 hydrotalcite and its low-temperature intermediate phases
چکیده انگلیسی

Three series of hydrotalcites (Mg : Al = 2 : 1, 3 : 1, and 4 : 1) and their low-temperature intermediate phases were treated with ethylene glycol. The hydrotalcites with 3 : 1 and 4 : 1 Mg : Al ratios intercalated ethylene glycol, but the sample with the 2 : 1 ratio did not. However, a hydrotalcite intermediate phase with carbonate anions grafted into the hydroxide layers (HT-B), and its hydrated form (HT-B-r), did intercalate ethylene glycol, even in samples with 2 : 1 Mg : Al ratios, owing to the low charge density of this intermediate phase. In all treated samples, intercalation resulted in the formation of an ethylene glycol monolayer or bilayer between the hydroxide layers.The quantity of intercalated ethylene glycol in all samples increased as the Mg : Al ratio increased and when interlayer water was present. Low-temperature intermediate phases HT-B and HT-B-r incorporated with 20–40% more ethylene glycol than did samples with hydrotalcite structure.Moderate heat treatment (225 °C) of intercalates caused grafting of approximately one ethylene glycol molecule per Al cation. The grafting of ethylene glycol molecules and carbonate anions proceeded independently, resulting in the formation of samples with both organic and inorganic components.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volume 31, Issues 1–2, January 2006, Pages 65–75
نویسندگان
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