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Flake size-dependent adsorption of graphene oxide aerogel

Soon, Poh Lee and Ali, Gomaa A. M. and Algarni, H. and K. F., Chong (2019) Flake size-dependent adsorption of graphene oxide aerogel. Journal of Molecular Liquids, 277. pp. 175-180. ISSN 0167-7322

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In this work, the flake size-dependent adsorption kinetics of graphene oxide (GO) aerogel is studied. GO in different flake sizes are produced by sonication prior to the preparation of aerogel through freeze-dry method. The structural characterizations reveal that GO aerogel with smaller flake size possesses higher surface area and higher intensity of edge-plane oxygen functionalities. These provide more adsorption sites and active sites for heavy metal ions adsorption. Adsorption study reveals the higher Fe3+ ions adsorption capacity as well as uptake rate on GO aerogel with smaller flake size. The adsorption kinetic obeys the pseudo-second-order kinetic model which indicates the chemisorption is the rate-determining step. Adsorption isotherms of GO aerogel on Fe3+ ions show highest Langmuir adsorption capacity of 133.3 mg/g and render it to be a potential material for heavy metal ions removal in wastewater treatment.

Item Type: Article
Uncontrolled Keywords: Aerogel; Graphene; Hydroxyl groups; Sheet size; Water treatment
Subjects: Q Science > Q Science (General)
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Noorul Farina Arifin
Date Deposited: 15 Jan 2019 03:00
Last Modified: 15 Jan 2019 03:00
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