Recovery of gold via adsorption-incineration techniques using banana peel and its derivatives: Selectivity and mechanisms

John Kwame Bediako, Jong Won Choi, Myung Hee Song, Yufeng Zhao, Shuo Lin, Amit Kumar Sarkar, Chul Woong Cho, Yeoung Sang Yun*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, banana peel (BP) and its derivatives after sequential extraction of biochemical components were evaluated for selective recovery of gold. In-depth instrumental characterizations including XPS, FTIR, XRD and HR-TEM were performed to understand the adsorption mechanisms. The biomass after lipid extraction, BP-L, demonstrated very good affinity and selectivity towards gold. In multi-metal systems containing 100 mg/L of Pt(IV), Au(III), Pd(II), Zn(II), Co(II), Ni(II) and Li(I), the selectivity coefficient increased from 978.45 in BP to 2034.70 in BP-L. Moreover, the equilibrium gold uptake was improved and reached 475.48 ± 3.08 mg/g owing to reduction-coupled adsorption mechanisms. The BP-L also showed improved gold nanoparticle formation properties that were pH-dependent. In a strategic adsorption-combined incineration process, metallic gold reaching 99.96% in purity was obtained. The BP and its derivative, BP-L have thus shown potentials for multiple applications in the areas of precious metal recovery and nanoscience.

Original languageEnglish
Pages (from-to)225-235
Number of pages11
JournalWaste Management
Volume113
DOIs
StatePublished - 15 Jul 2020
Externally publishedYes

Keywords

  • Adsorption-combined incineration
  • Banana peel
  • Gold nanoparticle
  • Gold recovery
  • Reduction-coupled adsorption

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