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Metals 2015, 5(4), 1921-1956; doi:10.3390/met5041921

Hydrometallurgical Recovery of Precious Metals and Removal of Hazardous Metals Using Persimmon Tannin and Persimmon Wastes

1
Department of Applied Chemistry, Faculty of Science & Engineering, Saga University, Honjo-Machi 1, Saga 840-8502, Japan
2
Department of Chemical and Biological Engineering, College of Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N 5A9, Canada
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editors: Suresh Bhargava, Mark Pownceby and Rahul Ram
Received: 3 June 2015 / Revised: 24 September 2015 / Accepted: 29 September 2015 / Published: 23 October 2015
(This article belongs to the Special Issue Hydrometallurgy)

Abstract

Novel and environmentally benign adsorbents were prepared via a simple sulfuric acid treatment process using the wastes of astringent persimmon, a type of biomass waste, along with persimmon tannin extract which is currently employed for the tanning of leather and as natural dyes and paints. The effectiveness of these new biosorbents was exemplified with regards to hydrometallurgical and environmental engineering applications for the adsorptive removal of uranium and thorium from rare earths, cesium from other alkaline metals such as sodium, hexa-valent chromium from zinc as well as adsorptive recovery of gold from chloride media. Furthermore, reductive coagulation of gold from chloride media for the direct recovery of metallic gold and adsorptive recovery of palladium and platinum using chemically modified persimmon tannin extract were studied. OPEN View Full-Text
Keywords: adsorption; precious metals; radioactive elements; chromium(VI); persimmon tannin; biomass wastes adsorption; precious metals; radioactive elements; chromium(VI); persimmon tannin; biomass wastes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Inoue, K.; Gurung, M.; Xiong, Y.; Kawakita, H.; Ohto, K.; Alam, S. Hydrometallurgical Recovery of Precious Metals and Removal of Hazardous Metals Using Persimmon Tannin and Persimmon Wastes. Metals 2015, 5, 1921-1956.

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