Mechanism of simultaneous removal of aluminum and fluoride from aqueous solution by La/Mg/Si-activated carbon
- Authors
- Kim, Minhee; Choong, Choe Earn; Hyun, Seunghun; Park, Chang Min; Lee, Gooyong
- Issue Date
- 8월-2020
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Aluminum; Fluoride; Adsorption mechanism; Lanthanum/magnesium/silica-activated carbon
- Citation
- CHEMOSPHERE, v.253
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMOSPHERE
- Volume
- 253
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/53874
- DOI
- 10.1016/j.chemosphere.2020.126580
- ISSN
- 0045-6535
- Abstract
- La/Mg/Si-activated carbon derived from palm shell has been a suitable material for removal of aluminum and fluoride from aqueous solution. In the study, the mechanism of simultaneous removal of aluminum and fluoride by La/Mg/Si-activated carbon (La/Mg/Si-AC) was investigated to understand its high efficiency. It was found that the removal of aluminum and fluoride by La/Mg/Si-AC was favored at lower pH compared to the point of zero charge of La/Mg/Si-AC and high temperature. Adsorption capacity of Al(OH)(4)(-) was about 10 times higher than that of F- due to the strong binding affinity of Al(OH)(4)(-) on protonated surface and competition between F- and OH- toward charged adsorption site. Kinetics results showed that the aluminum and fluoride adsorption were explained using the pseudo-second-order kinetic model and intra-particle diffusion model. Adsorption process of Al(OH)(4)(-) and F- was driven by the potential rate-limiting step involved in mass transport process occurred on the boundary diffusion layer of porous adsorbent surface. Electrostatic interaction between protonated surface of La/Mg/Si-AC and negatively charged ions (i.e., Al(OH)(4)(-) and F-) as well as ion-exchange between hydroxide and ionic metal species were important mechanisms in the process of aluminum and fluoride adsorption. Driving forces for adsorption of individual Al(OH)(4)(-) and F- were not entirely different. Identifying the dominant mechanism will be helpful in understanding the adsorption process and developing new adsorbent. (C) 2020 Published by Elsevier Ltd.
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Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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