Evolution of Phosphorus-Containing Groups on Activated Carbons during Heat Treatment

Yongfang Wang, Songlin Zuo, Jianxiao Yang, Seong Ho Yoon

研究成果: Contribution to journalArticle査読

36 被引用数 (Scopus)

抄録

Two types of activated carbons have been prepared by H3PO4 activation of lignocellulose and by H3PO4 modification of activated carbon, and then heat-treated at temperatures from 400 to 900 °C in an atmosphere of N2 or H2 to investigate the evolution of phosphorus-containing groups. Elemental analysis, X-ray photoelectron spectroscopy, 31P nuclear magnetic resonance, nitrogen adsorption, and scanning electron microscopy have been used to analyze the physicochemical properties of the activated carbons. The results show that C-O-P linkages of phosphorus-containing groups can progressively evolve into C-P-O, C3-P=O, C3-P, and eventually elemental phosphorus as a result of heat treatment. Phosphate-like groups are much more thermally stable in an N2 than in an H2 atmosphere. In N2, C-O-P linkages significantly evolve into C-P-O and C3-P=O at up to 800 °C, whereas C3-P linkages are not formed even at 900 °C. In H2, the corresponding evolution remarkably occurs at 500 °C, forming C3-P linkages and eventually elemental phosphorus. Moreover, the two activated carbons exhibit different evolution trends, suggesting that the evolution happens more easily for phosphorus-containing groups located on the edges of graphite-like crystallites than those in the lattice. Finally, we propose different evolution pathways of phosphorus-containing groups upon heat treatment in N2 and H2 atmospheres.

本文言語英語
ページ(範囲)3112-3122
ページ数11
ジャーナルLangmuir
33
12
DOI
出版ステータス出版済み - 3 28 2017

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 表面および界面
  • 分光学
  • 電気化学

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