Adsorption kinetics of silicic acid on akaganeite

Gaowa Naren, Hironori Ohashi, Yoshihiro Okaue, Takushi Yokoyama

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

As part of a series of studies on the interaction between ferric ions and silicic acid in the hydrosphere, the adsorption of silicic acid on akaganeite was investigated kinetically at various pH values. The adsorption of silicic acid increased with increasing pH over an initial pH range of 4-11.5. In the kinetic experiment, the Cl- was released from akaganeite much faster than silicic acid was adsorbed. From this result, we concluded that chloride ions bound on the surface of akaganeite are released and Fe-OH or Fe-O- sites are formed, which then acts as an adsorption site for silicic acid. The uptake mechanism of silicic acid by akaganeite is significantly different from that by schwertmannite, despite the presence of the same tunnel structure.

Original languageEnglish
Pages (from-to)87-91
Number of pages5
JournalJournal of Colloid And Interface Science
Volume399
DOIs
Publication statusPublished - Jun 1 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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