Effect of Polarity of Activated Carbon Surface, Solvent and Adsorbate on Adsorption of Aromatic Compounds from Liquid Phase

• Goto Tatsuru

  Graduate School of Engineering, Chiba University

• Amano Yoshimasa

  Graduate School of Engineering, Chiba University Safety and Health Organization, Chiba University

• Machida Motoi

  Graduate School of Engineering, Chiba University Safety and Health Organization, Chiba University

• Imazeki Fumio

  Safety and Health Organization, Chiba University

抄録

In this study, introduction of acidic functional groups onto a carbon surface and their removal were carried out through two oxidation methods and outgassing to investigate the adsorption mechanism of aromatic compounds which have different polarity (benzene and nitrobenzene). Adsorption experiments for these aromatics in aqueous solution and n-hexane solution were conducted in order to obtain the adsorption isotherms for commercial activated carbon (BAC) as a starting material, its two types of oxidized BAC samples (OXs), and their outgassed samples at 900°C (OGs). Adsorption and desorption kinetics of nitrobenzene for the BAC, OXs and OGs in aqueous solution were also examined. The results showed that the adsorption of benzene molecules was significantly hindered by abundant acidic functional groups in aqueous solution, whereas the adsorbed amount of nitrobenzene on OXs gradually increased as the solution concentration increased, indicating that nitrobenzene can adsorb favourably on a hydrophilic surface due to its high dipole moment, in contrast to benzene. In n-hexane solution, it was difficult for benzene to adsorb on any sample owing to the high affinity between benzene and n-hexane solvent. On the other hand, adsorbed amounts of nitrobenzene on OXs were larger than those of OGs in n-hexane solution, implying that nitrobenzene can adsorb two adsorption sites, graphene layers and surface acidic functional groups. The observed adsorption and desorption rate constants of nitrobenzene on the OXs were lower than those on the BAC due to disturbance of diffusion by the acidic functional groups.

収録刊行物

• ＣＨＥＭＩＣＡＬ　＆　ＰＨＡＲＭＡＣＥＵＴＩＣＡＬ　ＢＵＬＬＥＴＩＮ

  ＣＨＥＭＩＣＡＬ　＆　ＰＨＡＲＭＡＣＥＵＴＩＣＡＬ　ＢＵＬＬＥＴＩＮ 63 (9), 726-730, 2015

  公益社団法人 日本薬学会

キーワード

• aromatic compound
• adsorption
• activated carbon
• surface
• oxidation
• polarity

詳細情報

• CRID: 1390282679153920640
• NII論文ID: 130005096026
• NII書誌ID: AA00602100
• DOI: 10.1248/cpb.c15-00039
• ISSN: 13475223
• ISSN: 00092363
• NDL書誌ID: 026700076
• PubMed: 26329866
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I026700076
• Web Site: https://www.jstage.jst.go.jp/article/cpb/63/9/63_c15-00039/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • PubMed
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可