The formation of hematite from ferrihydrite using Fe(II) as a catalyst

被引：110

作者：

Liu, H

Wei, Y ^{[1
]}

Sun, Y

机构：

[1] Hebei Normal Univ, Coll Chem, Shijiazhuang 050016, Hebei, Peoples R China

[2] Chinese Acad Sci, Inst Coal Chem, Taiyuan 030001, Peoples R China

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2005年 / 226卷 / 01期

关键词：

ferrihydrite; Fe(II); catalytic phase transformation; hematite; formation mechanism;

D O I：

10.1016/j.molcata.2004.09.019

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The objective of the research is to determine the effects of Fe(II) on the phase transformation from ferrihydrite to hematite in pH range 5-9 at 100degreesC. It is confirmed that Fe(II) is a catalyst in the process of phase transformation of ferrihydrite. On one hand, Fe(II) can catalyze the formation of hematite by a dissolution/reprecipitation mechanism. On the other hand, Fe(II) can catalyze the formation of hematite by a solid-state transformation. The species of Fe(II) that take catalytic action on the phase transformation of ferrihydrite are probably FeOH+ and Fe(OH)(2). Both dissolution/reprecipitation and solid-state transformation can be explained by electron transfer. This phase transformation from ferrihydrite to hernatite. which is called as catalytic phase transformation, can be employed to synthesize hematite particles rapidly. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：135 / 140

页数：6

共 20 条

[1] INFLUENCE OF IRON(II) ON THE TRANSFORMATION OF FERRIHYDRITE INTO GOETHITE IN ACID-MEDIUM [J].