کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10378534 | 880757 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrokinetic properties of sepiolite suspensions in different electrolyte media
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The present paper deals with the electrokinetic characterization of sepiolite. A series of systematic zeta potential measurements have been carried out to determine the isoelectric point (iep) and potential-determining ions (pdi), and the effect of mono-, di-, and trivalent electrolytes such as NaCl, KCl, LiCl, NaNO3, NaCH3COO, MgCl2, CaCl2, BaCl2, CoCl2, CuCl2, Pb(NO3)2, Na2CO3, Na2SO4, AlCl3, FeCl3, and Na3PO4 on the zeta potential of sepiolite. Zeta potential has been calculated with the aid of Smoluchowski's equation. Sepiolite yields an isoelectric point at pH 6.6. The zeta potential for the sepiolite has ranged from +23.3 mV at pH â¼2 to â22.4 mV at pH â¼8 at 20±2â°C in water. The valency of the ions have proven to have a great influence on the electrokinetic behavior of the suspension. Monovalent cations were found to have a weak effect, while di- and trivalent cations made the zeta potential positive. Charge reversal was observed for divalent cations at 1Ã10â2M and for trivalent cations at 3Ã10â4M. As a result, it can be said that monovalent cations are indifferent ions when di- and trivalent cations are potential-determining ions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 281, Issue 1, 1 January 2005, Pages 240-248
Journal: Journal of Colloid and Interface Science - Volume 281, Issue 1, 1 January 2005, Pages 240-248
نویسندگان
Mahir Alkan, Ãzkan DemirbaÅ, Mehmet DoÄan,