Mansor, Nadia
(2019)
Studies Of Removal And Recovery Of
Palladium From Chloride Media Via An
Electrogenerative System.
Masters thesis, Universiti Sains Malaysia.
Abstract
The use of palladium nowadays is extensive especially as catalytic converter
of vehicles which contributed to increasing demand every year. With the limited
source and higher cost in mining and purifying process, palladium is recycled by the
industries. However, this precious metal is difficult and required high cost to be treated
especially in such low concentration (<500 mg L-1). To overcome this problem, an
electrogenerative system was introduced to recover palladium in chloride medium. It
is alternative method to other electrochemical methods where the chemical reaction
takes place spontaneously in this system since it does not require any external supply
of energy. A static batch cell was set up to treat low concentration of palladium in
dilute solutions. The dilute chloride with the concentration of 0.1-0.2 M NaCl was
optimum to treat palladium with concentration 100-500 mg L-1. A three-dimensional
cathode material of reticulated vitreous carbon (RVC) treated with sulphuric acid
appeared to give the best performance for optimum palladium deposition. The RVC
was found to have low resistance and high mass transfer from supporting analysis
using electrochemical impedance spectroscopy and cyclic voltammetry. The generated
flow current in this system was supported with a zinc as an anode. Overall, this system
showed about >90% of palladium being recovered within 6 h of operation. The
reduction of palladium ion was proved by controlled potential using cyclic
voltammetry. The deposited palladium on the cathode RVC is visible with naked eyes
and was further confirmed by the scanning electron microscopy-energy dispersive Xray
spectroscopy.
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