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Title: Speciation and crystal chemistry of Iron(III) chloride hydrolyzed in the presence of SiO{sub 4} ligands. 1. An Fe K-edge EXAFS study

Abstract

The hydrolysis of Fe-Si systems with Si/Fe ratios between 0 and 4 leads to the formation of poorly crystalline or, more frequently, of long-range disorganized precipitates. The increase of Si/Fe molar ratios results in a dramatic change of Fe polymerization. The formation of double and single corner-sharing Fe linkages is reduced compared to pure Fe hydrolysis products. The growth regime depends on the Si concentration in the system. Three-dimensional and two-dimensional growth of Fe colloids occurs at low and high Si/Fe ratios, respectively, systems with Si/Fe ratios around 1 representing a crossover between these two regimes. Though Si neighbors cannot be detected unequivocally by Fe K-edge EXAFS, their presence in the close environment of Fe atoms is evident from the change in Fe speciation.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
CNRS-Aix-Marseille III, Aix-en-Provence (FR)
Sponsoring Org.:
National Science Foundation (NSF); USDOE
OSTI Identifier:
20080280
DOE Contract Number:  
FC09-96SR18546
Resource Type:
Journal Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 16; Journal Issue: 10; Other Information: PBD: 16 May 2000; Journal ID: ISSN 0743-7463
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; IRON CHLORIDES; HYDROLYSIS; SILICON OXIDES; LIGANDS; ENVIRONMENTAL TRANSPORT; ADSORPTION

Citation Formats

Doelsch, E., Rose, J., Masion, A., Bottero, J.Y., Nahon, D., and Bertsch, P.M. Speciation and crystal chemistry of Iron(III) chloride hydrolyzed in the presence of SiO{sub 4} ligands. 1. An Fe K-edge EXAFS study. United States: N. p., 2000. Web. doi:10.1021/la991378h.
Doelsch, E., Rose, J., Masion, A., Bottero, J.Y., Nahon, D., & Bertsch, P.M. Speciation and crystal chemistry of Iron(III) chloride hydrolyzed in the presence of SiO{sub 4} ligands. 1. An Fe K-edge EXAFS study. United States. doi:10.1021/la991378h.
Doelsch, E., Rose, J., Masion, A., Bottero, J.Y., Nahon, D., and Bertsch, P.M. Tue . "Speciation and crystal chemistry of Iron(III) chloride hydrolyzed in the presence of SiO{sub 4} ligands. 1. An Fe K-edge EXAFS study". United States. doi:10.1021/la991378h.
@article{osti_20080280,
title = {Speciation and crystal chemistry of Iron(III) chloride hydrolyzed in the presence of SiO{sub 4} ligands. 1. An Fe K-edge EXAFS study},
author = {Doelsch, E. and Rose, J. and Masion, A. and Bottero, J.Y. and Nahon, D. and Bertsch, P.M.},
abstractNote = {The hydrolysis of Fe-Si systems with Si/Fe ratios between 0 and 4 leads to the formation of poorly crystalline or, more frequently, of long-range disorganized precipitates. The increase of Si/Fe molar ratios results in a dramatic change of Fe polymerization. The formation of double and single corner-sharing Fe linkages is reduced compared to pure Fe hydrolysis products. The growth regime depends on the Si concentration in the system. Three-dimensional and two-dimensional growth of Fe colloids occurs at low and high Si/Fe ratios, respectively, systems with Si/Fe ratios around 1 representing a crossover between these two regimes. Though Si neighbors cannot be detected unequivocally by Fe K-edge EXAFS, their presence in the close environment of Fe atoms is evident from the change in Fe speciation.},
doi = {10.1021/la991378h},
journal = {Langmuir},
issn = {0743-7463},
number = 10,
volume = 16,
place = {United States},
year = {2000},
month = {5}
}