Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 9, Issue 6, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106523
Keywords
Metal photodeposition; Palladium; Zinc oxide; Visible-light photocatalysis; Kinetic model
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This study explored a method for depositing palladium from solutions containing it using a zinc oxide catalytic system under UV/visible-light radiation, and identified the factors affecting the use of ethanol as a sacrificial agent. Additionally, a method for recovering pure metallic palladium using zinc oxide dissolution was proposed.
A shortage of market supplies is nowadays recorded for precious metals such as palladium, due to a wide range of applications in which they are used. The development of efficient and inexpensive recovery methodologies of precious metals from waste materials is thus necessary and urgent. In the present study a zinc oxide based photocatalytic system under UV/Visible-light radiation was chosen for palladium (II) deposition from solutions containing it. The effect of ethanol as sacrificial agent was investigated at varying catalyst load, irradiation conditions (UV+visible/visible/dark), metal starting concentration as well as the presence of cupric and chloride ions in solution. Moreover, ZnO dissolution at pH under 6.0 was proposed for the recovery of pure metallic palladium. A network of reactions and a kinetic model were proposed.
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