Abstract

Emad A. Mowafy^1,2 and D. Mohamed¹

DOI : http://dx.doi.org/10.13005/ojc/330530

The new unsymmetrical malonamide namely; N,N′‐dimethyl‐N,N′‐ dioctyltetradecyl-malonamide (DMDOTDMA) was prepared and evaluated as  agent for the extraction and separation  of Pd(II) from nitrate media was studied. N,N′‐dimethyl‐N,N′‐dioctylmalonamide (DMDOMA) was synthesized and used for comparison purpose.  The effect of various parameters had been studied in details to explain the extraction properties of pd(II) by using DMDOTDMA in mixed diluents (75 vol.% n-dodecane-25 vol.% n-octanol) from nitrate media. The extraction equilibrium of Pd(II) with the investigated maloamides was reached within 10 minutes. Pd(II) showed remarkable extractability by DMDOTDMA and the  maximum extraction percentage of Pd(II)  is nearly reached at ~ 5 M HNO₃. Under similar extraction conditions Zn(II),Ni(II), Mn(II) Cu(II) and Pb(II) were found poorly extracted. The dominate extracted species of Pd(II) is Pd(NO₃)₂(MA)₂.The separation of Pd(II) from other studied metal ions was found to be effective  in the range of nitric acid solution used. The stripping of Pd(II) was successfully carried out  by single contact with 0.1M thiourea solution.

Novel Extractant; Palladium; Base Metal Ions; Extraction/Separation; Nitric Acid

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