کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9674294 | 1453203 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of formaldehyde on Cu(II) removal from synthetic complexed solutions by solvent extraction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effect of formaldehyde on Cu(II) removal from synthetic complexed solutions by solvent extraction Effect of formaldehyde on Cu(II) removal from synthetic complexed solutions by solvent extraction](/preview/png/9674294.png)
چکیده انگلیسی
The effect of formaldehyde (HCHO) on the extraction of Cu(II) from an equimolar EDTA (ethylenediaminetetraacetic acid, H4L) solution with Aliquat 336 in kerosene (a quaternary amine) was examined. Experiments were carried out at different initial concentrations of Cu(II) (1.57-5 mol/m3), solution pH (3.0-8.0), HCHO concentrations (0-3 vol.%), Aliquat 336 concentrations (80-400 mol/m3), and temperatures (15-35 °C). It was shown that the distribution ratios (D) of Cu(II), which exists in the form of complexed anions CuL2â, increased with increasing equilibrium pH (pHeq), but reached a plateau at pHeq > 4 for the system without HCHO and at pHeq > 4.5 for the system with 1 vol.% HCHO. The D values increased with increasing HCHO concentration, likely due to the reduction of Cu(II) to Cu(I) by HCHO in solution. A semi-empirical two-parameter model was proposed to describe the extraction equilibrium, in which the non-ideality in organic phases was considered. The thermodynamic parameters were also evaluated and discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 120, Issues 1â3, 11 April 2005, Pages 1-7
Journal: Journal of Hazardous Materials - Volume 120, Issues 1â3, 11 April 2005, Pages 1-7
نویسندگان
Su-Hsia Lin, Hsiang-Chien Kao, Hsiu-Ning Su, Ruey-Shin Juang,