Selective fluoride removal in capacitive deionization by reduced graphene oxide/hydroxyapatite composite electrode
- Authors
- Park, Gyuleen; Hong, Sung Pil; Lee, Changha; Lee, Jaehan; Yoon, Jeyong
- Issue Date
- 1-Jan-2021
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Keywords
- Capacitive deionization; Reduced graphene oxide/hydroxyapatite composite; Selective fluoride removal; Water treatment
- Citation
- JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.581, pp.396 - 402
- Journal Title
- JOURNAL OF COLLOID AND INTERFACE SCIENCE
- Volume
- 581
- Start Page
- 396
- End Page
- 402
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/15639
- DOI
- 10.1016/j.jcis.2020.07.108
- ISSN
- 0021-9797
- Abstract
- Capacitive deionization (CDI) is an emerging desalination technology with an environmental-friendly operation and energy-efficient properties. However, activated carbon (AC) used for CDI electrode does not have a significant preference toward anions, leading to unnecessary energy consumption for treating fluoridated water. Hence, we achieved selective fluoride removal in CDI system using a reduced graphene oxide/hydroxyapatite composite (rGO/HA), a novel fluoride selective electrode material. The results showed that the rGO/HA electrode has 4.9 times higher fluoride removal capacity than the AC electrode from a ternary solution consisting of fluoride, chloride, and nitrate ions. The fluoride removal capacity increased when the adequate voltage was applied. Furthermore, the rGO/HA electrode exhibited stability and reusability without significant capacity loss even after 50-cycle operation, maintaining about 0.21 mmol g(-1) of fluoride removal capacity and approximately 96% of regeneration efficiency. Thus, this study suggests a novel electrode material for effective and selective fluoride removal in the CDI system. (C) 2020 Published by Elsevier Inc.
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Collections - College of Science and Technology > Department of Biological and Chemical Engineering > 1. Journal Articles
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