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Extraction Kinetics of Ni(II) in the Ni2+- SO42--Ac-(Na+, H+)-Cyanex 272 (H2A2)-Kerosene-3% (v/v) Octan-1-ol System Using Single Drop Technique

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DOI: 10.4236/ijnm.2013.22011    2,958 Downloads   6,007 Views   Citations

ABSTRACT

The kinetics of extraction of Ni(II) in the Ni2+-SO4 2_AC- (Na+, H+)-Cyanex 272 (H2A2)-kerosene-3% (v/v) octan-1-ol system using the single falling drop technique have been reported. The flux of Ni2+ transfer (F) at 303 K in presence of 3% (v/v) octan-1-ol (de-emulsifier) can be represented as:.Depending on reaction parameters, the activation energy (Ea) and enthalpy change in activation (DH±) varies within 17 - 58 kJ/mol and 17 - 67 kJ/mol, respectively. Entropy change in activation (DS±) is always negative. Based on the empirical flux equation, Ea and DS± values, mechanisms of extractions in different parametric conditions are proposed. At low and [Ac-], and pH, the chemical controlled step is: Ni2+ + A- NiA+; and this reaction occurs via an SN2 mechanism. But in most parametric conditions, the process is under intermediate control; and at high SO42- and [Ac-], and pH, the extraction process is under diffusion control.

Conflicts of Interest

The authors declare no conflicts of interest.

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Biswas, R. , Karmakar, A. and Rahman, M. (2013) Extraction Kinetics of Ni(II) in the Ni2+- SO42--Ac-(Na+, H+)-Cyanex 272 (H2A2)-Kerosene-3% (v/v) Octan-1-ol System Using Single Drop Technique. International Journal of Nonferrous Metallurgy, 2, 80-88. doi: 10.4236/ijnm.2013.22011.

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