Hydrothermal synthesis of porous materials from sepiolite

Zhen Long Wang, Zhen Zi Jing, Ke Wu, Lei Zhou, Jian Ming Yu, Zhi Shen Li, Emile H. Ishida

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

In order not only to manufacture a tough porous material from sepiolite but also to sustain the inherent properties of the sepiolite, a hydrothermal experiment was carried out under saturated steam pressure at 473 K for up to 24 h by mixing slaked lime. The experimental results show that the addition of slaked lime exerts a positive effect on the strength development, and the strength enhancement is found to be due to tobermorite and calcium silicate hydrate (CSH) gel formation. Curing time seems to condition the strength development. A fine particle size of sepiolite improves its activity during the hydrothermal process, thus offering a higher strength and quicker hardening rate of the synthesized specimen. The acid activation also has a beneficial effect on the strength development. The hardening mechanism of the synthesized specimen is different between the specimens synthesized with or without acid activation. The strength enhancement for sepiolite with acid activating is due mainly to CSH gel formation, instead of tobermorite formation without acid activation.

Original languageEnglish
Pages (from-to)219-232
Number of pages14
JournalResearch on Chemical Intermediates
Volume37
Issue number2-5
DOIs
Publication statusPublished - 2011 Apr 1

Keywords

  • Acid activation
  • Hydrothermal synthesis
  • Porous material
  • Sepiolite
  • Tobermorite

ASJC Scopus subject areas

  • Chemistry(all)

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