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Methane adsorption by porous graphene derived from rice husk ashes under various stabilization temperatures

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2020, 30(5), pp.535-543
  • DOI : 10.1007/s42823-020-00123-3
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : July 22, 2019
  • Accepted : January 31, 2020
  • Published : October 1, 2020

Che Othman Faten Ermala 1 Ismail Mohd Shafri 1 Yusof Norhaniza 1 Samitsu Sadaki 2 Yusop Mohd Zamri 3 Tajul Arifin Nur Fatihah 3 Alias Nur Hashimah 4 Jaafar Juhana 1 Aziz Farhana 1 Wan Salleh Wan Norharyati 1 Ismail Ahmad Fauzi 1

1Universiti Teknologi Malaysi
2National Institute for Materials Science
3Universiti Teknologi Malaysia
4Universiti Teknologi Mara

Accredited

ABSTRACT

The present work focused on the determination of texture, morphology, crystallinity, and gas adsorption characteristics of porous graphene prepared from rice husks ashes at diferent stabilization temperature. The stabilization temperature applied in this work is 100 °C, 200 °C, 300 °C, and 400 °C to convert rice husk into rice husk ashes (RHA). Chemical activation was adopted at temperature 800 °C using potassium hydroxide (KOH) as dehydrating agent at (1:5) impregnation ratio to convert RHA into rice husk ashes-derived graphene (GRHA). The resultant GRHA were characterized in terms of their morphologi�cal changes, SSA, crystallinity, and functional group with TEM, the BET method, Raman spectroscopy, and XRD analysis, respectively. Results from this study showed that the SSA of the GRHA at stabilization temperature 200 °C (1556.3 m2 /g) is the highest compared to the other stabilization temperature. Raman spectroscopy analysis revealed that all GRHA samples possess D, G, and 2D bands, which confrm the successful synthesis of the rice husks into porous graphene-like materials, known as GRHA. Appearance of difraction peak in XRD at 44.7° indicating the graphitic structure of all the GRHA sam�ples. Meanwhile, the TEM images of GRHA200 exhibited wrinkled structures due to the intercalation of oxygen and a few layers of graphene fakes. These wrinkled structures and graphene layers are the other factors that lead to the highest SSA of GRHA200 compared to other prepared samples GRHA. Furthermore, the adsorption capacity of CH4 for GRHA200 is up to 43 cm3 /g at 35 bar and ambient temperature, almost double the adsorption capacity performance of GRHA400 at the same operating pressure and temperature.

Citation status

This is the result of checking the information with the same ISSN, publication year, volume, and start page between the WoS and the KCI journals. (as of 2023-07-14)

Total Citation Counts(KCI+WOS) (14) This is the number of times that the duplicate count has been removed by comparing the citation list of WoS and KCI.

Scopus Citation Counts (17) This is the result of checking the information with the same ISSN, publication year, volume, and start page between articles in KCI and the SCOPUS journals. (as of 2023-10-01)

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