Journal
WASTE MANAGEMENT
Volume 113, Issue -, Pages 225-235Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2020.05.053
Keywords
Banana peel; Reduction-coupled adsorption; Adsorption-combined incineration; Gold recovery; Gold nanoparticle
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Funding
- Korean Government through the National Research Foundation of Korea, NRF [2017R1A2A1A05001207]
- Ministry of Education through the Global Ph.D. Fellowship Program [2019H1A2A1073523]
- National Research Foundation of Korea [2017R1A2A1A05001207] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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. (C) 2020 Elsevier Ltd. All rights reserved.
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