کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5411511 | 1506576 | 2014 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Extraction of lead picrate by 18-crown-6 ether into various diluents: Examples of sub-analysis of overall extraction equilibrium based on component equilibria
ترجمه فارسی عنوان
استخراج پیترات سرب توسط 18 ترانس-6 اتر به رقیق کننده های مختلف: نمونه های زیر تجزیه و تحلیل تعادل کل استخراج بر اساس تعادل مکانی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
چکیده انگلیسی
Extraction constants for lead picrate, PbPic2, with 18-crown-6 ether (L) from aqueous solutions at a narrow range of ionic strength (I) into eleven diluents were determined at 298 K by AAS measurements. These constants were defined as Kex = [PbLPic2]o/([Pb2 +][L]o[Picâ]2) and Kex ± = [PbLPic+]o[Picâ]o/([Pb2 +][L]o[Picâ]2), where the subscript “o” denotes the organic phase (or diluent). The ratio, Kex/Kex ±, gave an ion-pair formation constant for PbLPic+o+PicâoâPbLPic2,o at the averaged value of ionic strength (Io) of the organic phase. A plot of log Kex ± versus log KD,Pic yielded a straight line with the slope of 2.1 in a series of the diluents employed; KD,Pic refers to an apparent distribution constant of Picâ between the aqueous and organic phases and its values were experimentally determined. The slope indicated that Kex ± is mainly controlled by the square of KD,Pic when a thermodynamic cycle is assumed. The extraction constant based on the cycle was expressed as Kex ± = (KD,Pic)2KD,MKML,orgK1,org, where KD,MKML,orgK1,org denotes the product of other component equilibrium-constants. Moreover, the relation of log KD,Pic = alog (Io/I) + b was experimentally found at a â 1 and then an example of b was expressed theoretically. It was shown that Pb(II) can be separated from mixtures with Cd(II) in unit operation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 194, June 2014, Pages 121-129
Journal: Journal of Molecular Liquids - Volume 194, June 2014, Pages 121-129
نویسندگان
Yoshihiro Kudo, Yuu Takahashi, Chiya Numako, Shoichi Katsuta,