Hong, Hye-Jin Jeong, Hyeon Su Kim, Byoung-Gyu Hong, Jeongsik Park, In-Su Ryu, Taegong Chung, Kang-Sup Kim, Hyuncheol Ryu, Jungho 2024-01-20T02:34:29Z 2024-01-20T02:34:29Z 2021-09-05 2016-12 0045-6535 https://pubs.kist.re.kr/handle/201004/123363 In this study, a highly stable alginate/Fe3O4 composite was synthesized, and systematically investigated for the practical application of strontium (Sr) removal in complex media, such as seawater and radioactive wastewater. To overcome the drawbacks of the use of alginate microspheres, high contents of alginic acid and Fe3O4 were used to provide a more rigid structure with little swelling and facile separation, respectively. The synthesized composite was optimized for particle sizes of <400 mu m and 1% content of Fe3O4. The alginate/Fe3O4 composite showed excellent Sr uptake (approximate to 400.0 mg/g) and exhibited outstanding selectivity for Sr among various cations (Na, Mg, Ca and K). However, in diluted Sr condition (50 mg/L), Ca significantly affected Sr adsorption, resulting in a decrease of K-d value from 3.7 to 2.4 at the 0.01 M Ca. The alginate/Fe3O4 composite could be completely regenerated using 0.1 M HCl and CaCl2. In real seawater spiked with 50 mg/L of Sr, the alginate/Fe3O4 composite showed 12.5 mg/g of Sr uptake, despite the highly concentrated ions in seawater. The adsorption experiment for radio-active Sr-90 revealed a removal efficiency of 67% in real seawater, demonstrating the reliability of the alginate/Fe3O4 composite. (C) 2016 Elsevier Ltd. All rights reserved. English Pergamon Press Ltd. Highly stable and magnetically separable alginate/Fe3O4 composite for the removal of strontium (Sr) from seawater Article 10.1016/j.chemosphere.2016.09.034 1 Chemosphere, v.165, pp.231 - 238 Chemosphere 165 231 238 N scie scopus 000386402200027 2-s2.0-84988019840 Environmental Sciences Environmental Sciences & Ecology Article CALCIUM ALGINATE RADIOACTIVE STRONTIUM SODIUM NONATITANATE BEADS NANOPARTICLES ADSORPTION BEHAVIOR FUKUSHIMA STABILITY RECOVERY Strontium Removal Alginate Iron oxide Seawater