吸附
选择性
化学
X射线光电子能谱
金属
萃取(化学)
焚化
核化学
无机化学
催化作用
化学工程
有机化学
废物管理
工程类
作者
John Kwame Bediako,Jongwon Choi,Myung-Hee Song,Yufeng Zhao,Lin Song,Amit Kumar Sarkar,Chul-Woong Cho,Yeoung‐Sang Yun
标识
DOI:10.1016/j.wasman.2020.05.053
摘要
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.
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