کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1694119 1519061 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Continuous water adsorption states promoted by Ni2+ confined in a synthetic smectite
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Continuous water adsorption states promoted by Ni2+ confined in a synthetic smectite
چکیده انگلیسی


• XRD and TGA/DSC studies of fluorohectorite hydration
• H2O intercalation into smectite interlayer space with Ni2 + as the interlayer cation
• Continuous transitions between the hydration states
• Smectite hydration sensitivity to initial sample preparation and environmental history
• Hydration states for Ni-fluorohectorite

The water adsorption isotherms of Ni-fluorohectorite have been obtained from the relative humidity dependence of X-ray diffraction intensities, and continuous transitions between the stable hydration states were observed. This behavior is significantly different from previous studies of Na-fluorohectorite and Li-fluorohectorite smectites. It was also observed that the environmental history of the clay mineral samples is important for the behavior displayed by these isotherms. In addition, based on thermogravimetric and differential scanning calorimetry measurements, it was observed that a complete Ni-fluorohectorite dehydrated state can only be reached at long times (several hours) at 70 °C, or at shorter times (minutes) above 150 °C. Our observations are consistent with the existence of various forms of Ni2+–H2O complexes in Ni-fluorohectorite, and we suggest that the present results can be extended to other smectites with transition metals as interlayer charge compensating cations, and consequently have significant practical consequences in materials science and other areas.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volume 123, April 2016, Pages 83–91
نویسندگان
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