Extraction Kinetics of Ni(II) in the Ni<sup>2+</sup>- SO<sub>4</sub><sup style="margin-left:-7px;">2-</sup>-Ac<sup>-</sup>(Na<sup>+</sup>, H<sup>+</sup>)-Cyanex 272 (H<sub>2</sub>A<sub>2</sub>)-Kerosene-3% (v/v) Octan-1-ol System Using Single Drop Technique — Oak Academic Publishing
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Extraction Kinetics of Ni(II) in the Ni<sup>2+</sup>- SO<sub>4</sub><sup style="margin-left:-7px;">2-</sup>-Ac<sup>-</sup>(Na<sup>+</sup>, H<sup>+</sup>)-Cyanex 272 (H<sub>2</sub>A<sub>2</sub>)-Kerosene-3% (v/v) Octan-1-ol System Using Single Drop Technique
Department of Applied Chemistry and Chemical Engineering, Rajshahi University, Rajshahi, Bangladesh
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Department of Applied Chemistry and Chemical Engineering, Rajshahi University, Rajshahi, Bangladesh
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Department of Applied Chemistry and Chemical Engineering, Rajshahi University, Rajshahi, Bangladesh
1 Department of Applied Chemistry and Chemical Engineering, Rajshahi University, Rajshahi, Bangladesh
2 Department of Applied Chemistry and Chemical Engineering, Rajshahi University, Rajshahi, Bangladesh
3 Department of Applied Chemistry and Chemical Engineering, Rajshahi University, Rajshahi, Bangladesh
The kinetics of extraction of Ni(II) in the Ni 2+ -SO 4 2_ AC - (Na + , H + ) - Cyanex 272 (H 2 A 2 )-kerosene-3% (v/v) octan-1-ol system using the single falling drop technique have been reported. The flux of Ni 2+ 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 ( E a ) and enthalpy change in activation ( D H ± ) varies within 17 - 58 kJ/mol and 17 - 67 kJ/mol, respectively. Entropy change in activation ( D S ± ) is always negative. Based on the empirical flux equation, E a and D S ± values, mechanisms of extractions in different parametric conditions are proposed. At low and [Ac - ], and pH, the chemical controlled step is: Ni 2+ + A - → NiA + ; and this reaction occurs via an S N 2 mechanism. But in most parametric conditions, the process is under intermediate control; and at high SO 4 2- and [Ac - ], and pH, the extraction process is under diffusion control.
KeywordsKineticsCyanex 272SulphateKeroseneNi<sup>2+</sup>Single Drop Technique
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