Hydrothermal preparation of tobermorite from blast furnace slag for Cs+ and Sr2+ sorption

Takuma Tsutsumi, Shunsuke Nishimoto, Yoshikazu Kameshima, Michihiro Miyake

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39 Citations (Scopus)

Abstract

Al-substituted 11Å-tobermorite was formed by alkaline hydrothermal treatment of blast furnace slag with sodium silicate added at 180°C for 2-48h. Effects of the hydrothermal treatment time were characterized by XRD, SEM, and isothermal adsorption of N2. Sorption characteristics of the obtained samples were examined for Cs+ and Sr2+. The sample obtained by hydrothermal treatment for 48h (HT-48h) consisted of calcium silicate hydrate (C-S-H), and Al-substituted 11Å-tobermorite. The HT-48h showed the highest performance for Cs+ and Sr2+ selectivity in the presence of Na+. The interlayer Na+ of Al-substituted 11Å-tobermorite and surface Ca2+ played an important role in selective Cs+ and Sr2+.

Original languageEnglish
Pages (from-to)174-181
Number of pages8
JournalJournal of Hazardous Materials
Volume266
DOIs
Publication statusPublished - Feb 15 2014

Keywords

  • Al-substituted 11Å-tobermorite
  • Blast furnace slag
  • Hydrothermal treatment

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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