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The mechanism of extraction of Mo (VI) from diluted HCl and HNO3 solutions with di(2-ethylhexyl) phosphoric acid (D2EHPA) dissolved in n-hexane has been investigated. The mechanism of extraction from both acids at pH 1.0 – 6.0 was found to be majorly by cation exchange of MoO 2 2+ for H + of the extractant (H 2 R 2 ), while at lower pH value, it was observed to be by neutral, unstable isopoly acid, H 4 Mo 8 O 26 or nMoO 3 .2H 2 O and MoO 2 2+ . The extraction efficiency was maximal at pH 1.0 for both acids, E% = 84.8 and 80.0 for HCl and HNO 3 media respectively. From the method of slope analysis, the number of D2EHPA molecules associated with MoO 2 2+ was found to be two at pH = 1.0. Keywords : Extractant, cation exchange, isopoly acid, slope analysis.

Mechanism of the extraction of Molybdenum(VI) from diluted HCl and HNO3 solutions with di(2-ethylhexyl)phosphoric acid

Mechanism of the extraction of Molybdenum(VI) from diluted HCl and HNO₃ solutions with di(2-ethylhexyl)phosphoric acid