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Effect of formaldehyde on Cu(II) removal from synthetic complexed solutions by solvent extraction [An article from: Journal of Hazardous Materials]
Book Details
PublisherElsevier
ISBN / ASINB000RR45C0
ISBN-13978B000RR45C5
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Journal of Hazardous Materials, published by Elsevier in 2005. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The effect of formaldehyde (HCHO) on the extraction of Cu(II) from an equimolar EDTA (ethylenediaminetetraacetic acid, H"4L) solution with Aliquat 336 in kerosene (a quaternary amine) was examined. Experiments were carried out at different initial concentrations of Cu(II) (1.57-5mol/m^3), solution pH (3.0-8.0), HCHO concentrations (0-3vol.%), Aliquat 336 concentrations (80-400mol/m^3), and temperatures (15-35^oC). It was shown that the distribution ratios (D) of Cu(II), which exists in the form of complexed anions CuL^2^-, increased with increasing equilibrium pH (pH"e"q), but reached a plateau at pH"e"q>4 for the system without HCHO and at pH"e"q>4.5 for the system with 1vol.% 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.
Description:
The effect of formaldehyde (HCHO) on the extraction of Cu(II) from an equimolar EDTA (ethylenediaminetetraacetic acid, H"4L) solution with Aliquat 336 in kerosene (a quaternary amine) was examined. Experiments were carried out at different initial concentrations of Cu(II) (1.57-5mol/m^3), solution pH (3.0-8.0), HCHO concentrations (0-3vol.%), Aliquat 336 concentrations (80-400mol/m^3), and temperatures (15-35^oC). It was shown that the distribution ratios (D) of Cu(II), which exists in the form of complexed anions CuL^2^-, increased with increasing equilibrium pH (pH"e"q), but reached a plateau at pH"e"q>4 for the system without HCHO and at pH"e"q>4.5 for the system with 1vol.% 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.
