Synergistic strippants of Pd (II) ions in the presence of chloride medium from wastewater of electroless plating process via solvating system: Kinetics and thermodynamics study

ABSTRACT

Synergistic strippants of palladium complex with Trialkylmethylammonium chloride (Aliquat 336) has been investigated. Results show that synergistic strippants of thiourea and HCl can enhance the palladium stripping efficiency from the loaded Aliquat 336. Extraction of Pd (II) ions is sensitive to the concentration of extractant and chloride medium. The partition coefficient ascertained from the model was fitted with an experimental value. Thermodynamics analysis showed that ΔH and ΔS values were obtained at 10.74 kJ/mol and 77.81 J/molK, respectively.

KEYWORDS:

• Synergistic strippants
• solvating system
• Aliquat 336
• Pd (II) separation
• stripping kinetic

Highlights

• Enhancement of stripping efficiency of Pd (II) ions using synergistic strippants from real samples of industrial wastewater.

• Isotherm model of Pd (II) solvating system: (1) Langmuir, (2) Freundlich, and (3) Temkin isotherms.

• Partition coefficient model.

• Kinetic study of Pd (II) solvating system.

• Kinetic model for complex stripping system.

Acknowledgments

Thanks are also given to the Separation Laboratory, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, for chemical and apparatus support, as well as to the Mektec Manufacturing Corporation (Thailand) Ltd, for feed solution.

Additional information

Funding

The authors profoundly appreciate the support from the Thailand Research Fund and Chulalongkorn University under the Research and Researchers for Industries (RRi) PhD Program (Grant No. PHD58I0081).