期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 341, 期 1-3, 页码 46-52出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2009.03.037
关键词
Fe(III)-montmorillonite; Fe (hydr)oxide coating; Ferrihydrite; Phosphate adsorption
资金
- CONICET
- SECyT
Two Fe(III)-modified montmorillonites were synthesized by mixing Fe(III) nitrate solutions with montmorillonite at pH 3.5 followed by an increase in pH up to 9. The synthesis procedure was analyzed by Solubility calculations and Fe(III) speciation in aqueous solutions, and the resulting solids were characterized by X-ray diffraction, specific surface area, Mossbauer spectroscopy, electrophoretic mobilities (EM) and phosphate adsorption. At low pH, iron concentration in solution during the synthesis is controlled by adsorption/intercalation reactions, whereas at high pH the concentration is controlled by the solubility of ferrihydrite. When the initial Fe(III) content is relatively low the synthesized solid contains mainly interlayer/sorbed Fe(III). When the initial Fe(III) content is relatively high the synthesized solid contains also some iron (hydr)oxide phases, mainly ferrihydrite. These Fe(III) phases are in close contact with montmorillonite, either coating the montmorillonite surface or aggregated with montmorillonite particles. The presence of Fe(III) species increases significantly the specific surface area and phosphate adsorption capacity, but changes only slightly the EM of the solid. (C) 2009 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据