Recovery of palladium (II) from aqueous solution through photocatalytic deposition in presence of ZnO under UV/Visible-light radiation. Issue 6 (December 2021)

• Record Type: Journal Article
• Authors: Muscetta, Marica; Andreozzi, Roberto; Marotta, Raffaele; Di Somma, Ilaria
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 6(2021)
• Publication Date: 2021-12
• Subjects: Metal photodeposition -- Palladium -- Zinc oxide -- Visible-light photocatalysis -- Kinetic model; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.106523
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: 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. Graphical Abstract: ga1 Highlights: A photocatalytic process to recover palladium from leaching solution was proposed. ZnO nanoparticles were proposed for palladium recovery. Light source and ethanol concentration strong influence palladium photodeposition. The separation of photodeposited Pd was obtained by reducing the pH of the solution. The estimation of kinetic parameters for palladium photodeposition was performed.