Effect of monosilicic acid on hydrolytic polymerization of fe(III) and structure hydrolytic products

Shin-Ichiro Wada, Naota Veno

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

To analyze the mechanism of retarded hydrolytic polymerization of Fe(III) and crystallization of the hydrolytic products in the presence of H4SiO4, we measured the changes in the monomeric Fe(III) concentration as a function of pH, H4SiO4 concentration, and aging time, and characterized the hydrolytic reaction products by a combination of methods. The monomeric Fe(III) concentration in solutions with higher H4SiO4 concentrations was significantly higher than that in an Si-free solution but the differences gradually narrowed with aging time. Chemical equilibrium calculation showed that the concentration of the FeH3SiO4 2+ complex was not high enough to account for the reduced rate of hydrolytic polymerization. Electron microscopy and infrared spectroscopy showed that the hydrolytic products were ferrihydrite or Si-containing ferrihydrite and their particle size decreased with increasing H4SiO4 concentration. On the basis of these observations, we concluded that the interfering effect of H4SiO4 on the hydrolytic polymerization involved two mechanisms: 1) the coexistence of H4SiO4 delayed the kinetics of the hydrolytic polymerization of Fe(III) to a certain extent due to the formation of an FeH3SiO4 2+ complex, and 2) H4SiO4 retarded the growth of Fe(III) hydroxides by binding onto the active sites of the hydrolytic products.

Original languageEnglish
Pages (from-to)727-735
Number of pages9
JournalSoil Science and Plant Nutrition
Volume47
Issue number4
DOIs
Publication statusPublished - Jan 1 2001

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polymerization
ferrihydrite
acids
acid
chemical equilibrium
hydroxides
infrared spectroscopy
crystallization
electron microscopy
active sites
coexistence
hydroxide
particle size
kinetics
effect
product
methodology

All Science Journal Classification (ASJC) codes

  • Soil Science
  • Plant Science

Cite this

Effect of monosilicic acid on hydrolytic polymerization of fe(III) and structure hydrolytic products. / Wada, Shin-Ichiro; Veno, Naota.

In: Soil Science and Plant Nutrition, Vol. 47, No. 4, 01.01.2001, p. 727-735.

Research output: Contribution to journalArticle

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