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Environmental Engineering Research 2012;17(2): 65-67. DOI: https://doi.org/10.4491/eer.2012.17.2.065
Desorption and Regeneration Characteristics for Previously Adsorbed Indium Ions to Phosphorylated Sawdust
Taik-Nam Kwon, and Choong Jeon
Department of Biochemical Engineering, Gangneung-Wonju National University, Gangneung 210-702, Korea
Corresponding Author: Choong Jeon ,Tel: +82-33-640-2405, Fax: +82-33-641-2410, Email: metaljeon@gwnu.ac.kr
Received: January 31, 2012;  Accepted: May 11, 2012.
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ABSTRACT
The desorption characteristics of previously adsorbed indium ions on phosphorylated sawdust were tested by various chemical reagents such as HCl, HNO3, NaCl, ethylenediaminetetraacetic acid, and nitrilotriacetic acid. Among them, HCl was chosen as the best desorbing agent in terms of economics. The desorption efficiency of HCl for indium ions was about 97% at a concentration of 0.5 M. The desorption efficiency for indium ions was very high at about 94% even at a solid/liquid ratio of 10.0, and the desorption process was quickly performed within 60 min. The removal efficiency of indium ions in recycled phosphorylated sawdust could be maintained at 85% in the 4th cycle.
Keywords: Desorption | Indium ions | Recovery | Regeneration | Sawdust
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