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Sodium-lignosulfonate derived activated carbon: an investigation into the role of NaOH in the activation mechanism

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2023, 33(6), pp.1819-1826
  • DOI : 10.1007/s42823-023-00522-2
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : March 21, 2023
  • Accepted : April 24, 2023
  • Published : October 1, 2023

Choi Jueun 1 Choi Go Bong 2 Seo Sol Bin 3 Choi Yu Rim 3 Kang Min 3 Kim Yoong Ahm 3

1Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka, 816-8580, Japan
2Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
3Chonnam National University

Accredited

ABSTRACT

We produced an activated carbon using sodium-lignosulfonate, in which we investigated how the sodium salt in lignin served as the activating agent during heat treatment. Our process resulted in a product with a high specific surface area of 1324 m2/g at 800 °C and microporous structure. During the activation process, we observed the consumption of carbon due to the dehydration reaction of NaOH and the reduction of Na2CO3 to metallic Na, which created pores through oxidation/reduction reactions. The intercalation of metallic Na between the lattices at high temperatures formed additional pores and increased the specific surface area. Our proposed mechanism holds promise for enhancing the control of the microstructure and porosity of activated carbons through the thermal treatment of biomass.

Citation status

* References for papers published after 2022 are currently being built.

This paper was written with support from the National Research Foundation of Korea.