Flake size-dependent adsorption of graphene oxide aerogel

• Main Authors: Soon, Poh Lee, Ali, Gomaa A. M., Algarni, H., K. F., Chong
• Format: Article
• Language: English
• Published: Elsevier 2019
• Subjects: Q Science (General)
• Online Access: http://umpir.ump.edu.my/id/eprint/23786/1/Flake%20size-dependent%20adsorption%20of%20graphene%20oxide%20aerogel.pdf; http://umpir.ump.edu.my/id/eprint/23786/; https://doi.org/10.1016/j.molliq.2018.12.097; https://doi.org/10.1016/j.molliq.2018.12.097

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.