Adsorptive removal of atmospheric pollutants over Pyropia tenera chars

Heejin Lee, Rae Su Park, Hyung Won Lee, Yeojin Hong, Yejin Lee, Sung Hoon Park, Sang Chul Jung, Kyung Seun Yoo, Jong Ki Jeon, Young Kwon Park

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20 Scopus citations


As a replacement for activated carbon, biochar was synthesized and used for the adsorptive removal of formaldehyde and nitrogen oxide. Biochar was produced from the fast pyrolysis of the red marine macro alga, Pyropia tenera. The P. tenera char was then activated with steam, ammonia and KOH to alter its characteristics. The adsorption of formaldehyde, which is one of the main indoor air pollutants, onto the seaweed char was performed using 1-ppm formaldehyde and the char was activated using a range of methods. The char activated with both the KOH and ammonia treatments showed the highest adsorptive removal efficiency, followed by KOH-treated char, ammonia-treated char, steam-treated char, and non-activated char. The removal of 1000-ppm NO over untreated char, KOH-treated char, and activated carbon was also tested. While the untreated char exhibited little activity, the KOH-treated char removed 80% of the NO at 50°C, which was an even higher NO removal efficiency than that achieved by activated carbon.

Original languageEnglish
Pages (from-to)79-88
Number of pages10
JournalCarbon Letters
Issue number1
StatePublished - Jul 2016


  • Activation
  • Adsorption
  • Formaldehyde removal
  • NO removal
  • Pyropia tenera char


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