title: Development of polyethyleneimine-loaded core-shell chitosan hollow beads and their application for platinum recovery in sequential metal scavenging fill-and-draw process.
abstract: Polyethyleneimine (PEI)-loaded chitosan hollow beads (CHBs) were fabricated through the ionotropic gelation process using sodium tripolyphosphate (TPP) as a counter polyanion. The CHBs were loaded with hydrophilic PEI in pre- and/or post-loading methods. Hence, the sorbent could possess a large number of amine groups which were able to function as the binding sites to recover platinum metal ions. The enhancement of the amine groups was confirmed by Fourier transform infrared spectroscopy (FTIR). Isotherm and kinetic studies were carried out to evaluate the sorption performance of the sorbents. The maximum Pt(IV) uptake by the PEI-loaded CHBs was estimated to be 815.2±72.6mg/g, which was much higher than that of a commercial ion exchange resin, Lewatit®MonoPlus TP214 (330.2±16.6mg/g). A sequential metal scavenging fill-and-draw process was operated using the PEI-loaded CHBs sorbents for ten cycles and the Pt(IV) recovery efficiency was kept above 97.4% even after the last cycle. These results indicated that the ionic polymer-loaded hydrogel hollow beads can be a novel platform to design high-performance sorbents able to recover and/or scavenge anionic precious metal ions even from trace metal solutions.
authors.affiliation: Division of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea.
authors.forename: Myung-Hee
authors.initials: MH
authors.lastname: Song
authors.affiliation: Division of Environmental Science and Ecological Engineering, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea.
authors.forename: Sok
authors.initials: S
authors.lastname: Kim
authors.affiliation: School of Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea.
authors.forename: D Harikishore Kumar
authors.initials: DH
authors.lastname: Reddy
authors.affiliation: Division of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea.
authors.forename: Wei
authors.initials: W
authors.lastname: Wei
authors.affiliation: Division of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea.
authors.forename: John Kwame
authors.initials: JK
authors.lastname: Bediako
authors.affiliation: Division of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea.
authors.forename: Sangwon
authors.initials: S
authors.lastname: Park
authors.affiliation: Division of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea; School of Chemical Engineering, Chonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea. Electronic address: ysyun@jbnu.ac.kr.
authors.forename: Yeoung-Sang
authors.initials: YS
authors.lastname: Yun
keywords: Chitosan; Hollow bead; Platinum; Polyethyleneimine; Recovery