Palladium recovery from spent Pd plating solutions using Lewatit TP 214 resin


ÇETİNER B. N. , Yegul E. U. , Zeytuncu Gökoğlu B. , AKTAŞ S.

DESALINATION AND WATER TREATMENT, vol.253, pp.211-222, 2022 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 253
  • Publication Date: 2022
  • Doi Number: 10.5004/dwt.2022.28304
  • Title of Journal : DESALINATION AND WATER TREATMENT
  • Page Numbers: pp.211-222
  • Keywords: Palladium recovery, Waste plating solution, Ion-exchange resin, Lewatit TP 214, ION-EXCHANGE-RESINS, CHLORIDE SOLUTIONS, FUNCTIONAL-GROUPS, ADSORPTION, COMPLEXES, REMOVAL, MEDIA

Abstract

This study aims to explore the recovery of palladium (Pd(II)) ions using Lewatit TP 214 resins. Waste Pd(II) ions with ammonia complex procured from a precious metal plating were selected as the source solution. In the experimental studies, two stock solutions of 60 ppm Pd(II) with a pH value of 4.0 and 7.5 were prepared as initial solutions. The experiments were performed by altering four parameters: solution pH, time 15-180 min, temperature 25 degrees C-60 degrees C, and amount of resin 100-400 mg. It was proved that the recovery percentage increased with higher temperature and resin at lower pH values. The Pd(II) recovery percentage increased with a temperature rise, reaching 100% after 40 min at pH 4.0 and 60 degrees C. On the other hand, a bit lower efficiency (95%) was attained after 180 min at pH 7.5 and 60 degrees C. Using Lewatit TP 214, the computed activation energies for Pd(II) recovery are 17.73 and 15.62 kJ/mol at pH 4.0 and 7.5, respectively. Considering these activation energy values, a mixed mechanism dominated the recovery of Pd(II).