Recovery of gold from hydrometallurgical leaching solution of electronic
waste via spontaneous reduction by polyaniline |
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Authors: | Yuanzhao Wu Qingming Fang Xiaohui Yi Gang Liu and Run-Wei Li |
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Institution: | CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo,
Zhejiang 315201, China,CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo,
Zhejiang 315201, China,CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo,
Zhejiang 315201, China,CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo,
Zhejiang 315201, China and CAS Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo,
Zhejiang 315201, China |
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Abstract: | The present study is primarily designed to develop an environmentally-benign approach for the recovery of
precious metals, especially gold, from the ever increasingly-discarded electronic wastes (e-waste). By coupling
the metal reduction process with an increase in the intrinsic oxidation state of the aniline polymers, and the
subsequent re-protonation and reduction of the intrinsically oxidized polymer to the protonated emeraldine
(EM) salt, polyaniline (PANi) films and polyaniline coated cotton fibers are able to recover metallic gold from
acid/halide leaching solutions of electronic wastes spontaneously and sustainably. The current technique, which
does not require the use of extensive extracting reagents or external energy input, can recover as much as 90% of
gold from the leaching acidic solutions. The regeneration of polyaniline after gold recovery, as confirmed by the
X-ray photoelectron spectroscopy measurements, promises the continuous operation using the current
approach. The as-recovered elemental gold can be further concentrated and purified by incineration in air. |
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Keywords: | Polyaniline
Spontaneous redox reaction
Gold recovery
Electronic waste
Hydrometallurgical leaching |
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