title: Colorimetric detection and removal of radioactive Co ions using sodium alginate-based composite beads.
abstract: We demonstrate a simple method for the visual determination and removal of Co ions using a bead-shaped, capturing probe based on hybridized sodium alginate. For Co ions, the designed protocol consisted of three main constituents: an azopyridine-based Co ion-probe for visual detection; sodium alginate as an adsorbent for the Co ion and a bead construct for removal and structure; silica as a linker for the probe and the alginate, leading to a robust structure. When the composite beads were exposed to Co ions, the yellow color of the beads turned to intensive violet and the color intensity was associated with the Co ion concentration. The color variation was quantified using red-green-blue (RGB) color values that were obtained with a scanner and evaluated with Photoshop. The technique achieved both visual recognition with obvious color change of the beads and efficient removal of the radioactive60Co ion. The sensing and removal of any radioactive isotope could be achieved with an appropriate sensing probe, to provide a simple and universal platform for remediation.
authors.affiliation: Organic and Optoelectronic Materials Laboratory, Department of Organic Materials Engineering, Chungnam National University, Daejeon 34134, Republic of Korea.
authors.forename: Daigeun
authors.initials: D
authors.lastname: Kim
authors.affiliation: Organic and Optoelectronic Materials Laboratory, Department of Organic Materials Engineering, Chungnam National University, Daejeon 34134, Republic of Korea.
authors.forename: Ara
authors.initials: A
authors.lastname: Jo
authors.affiliation: Decontamination and Decommissioning Research Division, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.
authors.forename: Hee-Man
authors.initials: HM
authors.lastname: Yang
authors.affiliation: Decontamination and Decommissioning Research Division, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.
authors.forename: Bum-Kyoung
authors.initials: BK
authors.lastname: Seo
authors.affiliation: Decontamination and Decommissioning Research Division, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.
authors.forename: Kune-Woo
authors.initials: KW
authors.lastname: Lee
authors.affiliation: Organic and Optoelectronic Materials Laboratory, Department of Organic Materials Engineering, Chungnam National University, Daejeon 34134, Republic of Korea. Electronic address: tslee@cnu.ac.kr.
authors.forename: Taek Seung
authors.initials: TS
authors.lastname: Lee
keywords: Azopyridine dye; Detection and removal; Radioisotopes; Silica linkage; Sodium alginate bead