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Influence of mixed methods on the surface area and gas products of activated carbon

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2020, 30(6), pp.603-611
  • DOI : 10.1007/s42823-020-00130-4
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : December 11, 2019
  • Accepted : February 24, 2020
  • Published : December 1, 2020

Hwang, Sang Youp 1 Lee Gi Bbum 2 Kim Ho 2 Jung Eun Park 1

1고등기술연구원연구조합
2고등기술연구원

Accredited

ABSTRACT

Upgraded activated carbons (ACs) are typically synthesized by mixed methods, such as solid–solid mixing and wet impregna�tion of low-grade ACs with KOH. This study compares the properties of upgraded ACs prepared by diferent methods using elemental analysis, X-ray photoelectron spectroscopy, N2 adsorption isotherms, and X-ray difraction. In ACs produced by the solid–solid mixing, the ratio of potassium activator is proportional to the surface area and amount of gas produced. However, in wet impregnated ACs, the potassium ratio exhibits a zero or negative correlation. It is demonstrated that potassium ions in solution are not transferred to K2O and do not contribute to the surface area and pore size, generating less amount and diferent composition of gases. As such, impregnated ACs exhibit similar surface areas and large pores, regardless of the potassium ratio. The physical properties, such as specifc surface areas and pore size distribution, of ACs using wet impregna�tion were similar to the ACs generated by the water physical activation. It indicated that the KOH does not efciently act as a chemical activator in the wet impregnation method. Therefore, a certain amount and suitable mixing method of chemical activator play an important role in the property upgrade of ACs.

Citation status

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Total Citation Counts(KCI+WOS) (7) 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 (6) 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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