Selective adsorption of Au 3+ from aqueous solutions using persimmon powder‐formaldehyde resin

• Published in: Journal of applied polymer science Vol. 130; no. 6; pp. 3937 - 3946
• Main Authors: Xie, Feng, Fan, Zaijun, Zhang, Qinglin, Luo, Zhengrong
• Format: Journal Article
• Language: English
• Published: 15.12.2013
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.39521

ABSTRACT A new adsorption resin has been developed by immobilizing persimmon powder with formaldehyde, and its adsorption properties to Au 3+ were investigated in detail. The resin exhibited outstanding selective adsorption capacity towards Au 3+ from acidic aqueous solutions (pH 2.0), which the equilibrium adsorption capacity was high up to 3025.20 mg g −1 at 323 K. The resin exhibited 100% adsorption of Au 3+ within 8 h, and the experimental data were well fitted with the pseudo‐first/second‐order rate model. The adsorption isotherms could be well described by Freundlich equation. The column studies suggested that the resin was effective for the adsorption of Au 3+ from aqueous solutions, and the loaded Au 3+ could be easily desorbed by acidic thiourea solution. The adsorption of Au 3+ was an endothermic reductive adsorption process. This suggested that the resin can be used as an active biosorbent for the recovery of Au 3+ from aqueous environment. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 3937–3946, 2013