Effect of temperature, time and Zncl2 addition on formation of oxygenated functional groups on the surface of flexible carbon prepared by hydrothermal carbonization

Atsumi Miyajima, Taiga Watanabe, Masaru Watanabe, Richard Lee Jr. Smith, Tatsuya Shingu, Hirohumi Yamada

Research output: Contribution to journalArticlepeer-review

Abstract

To increase the amount of oxygenated functional groups that contribute to the hydrophilicity of a flexible carbon surface, hydrothermal carbonization was applied. A 20 wt% slurry of Pseudotsuga menziesii was hydrothermally treated at 200-250°C for 0.5-24 h in the presence of 0-100 g of zinc chloride (ZnCl2). Hydrochar yield, residual cellulose ratio, H/C, O/C, and the amount of oxygenated functional groups (OFGs) were evaluated. The amount of OFGs decreased due to dehydration of cellulose and other components, but increased due to hydrolysis of molecular structures such as lactone ring-opening caused by prolonged reaction time and by addition of ZnCl2. These studies revealed that ZnCl2 was an effective additive to promote carbonization and to increase OFGs formation at 250°C in hydrothermal carbonization of woody biomass.

Original languageEnglish
Pages (from-to)123-128
Number of pages6
Journalkagaku kogaku ronbunshu
Volume44
Issue number2
DOIs
Publication statusPublished - 2018 Jan 1

Keywords

  • Hydrothermal carbonization
  • Oxygenated functional groups
  • Zinc chloride

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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