A fast route to obtain manganese spinel nanoparticles by reduction of K-birnessite

被引：11

作者：

Giovannelli, F. ^{[1
]}

Chartier, T. ^{[1
]}

Autret-Lambert, C. ^{[2
]}

Delorme, F. ^{[3
,4
]}

Zaghrioui, M. ^{[1
]}

Seron, A. ^{[3
]}

机构：

[1] Univ Tours, LEMA, UMR 6157, CNRS,CEA, F-41029 Blois, France

[2] Univ Tours, LEMA, UMR 6157, CNRS,CEA, F-37200 Tours, France

[3] Bur Rech Geol & Minieres, F-45060 Orleans 2, France

[4] CETC, CORNING SAS, F-77210 Avon, France

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2009年 / 182卷 / 05期

关键词：

Nanoparticles; Birnessite; Hausmanite; Reduction; Spinel; MN3O4; NANOCRYSTALLITES; MNOOH NANORODS; DECOMPOSITION; HAUSMANNITE; CONVERSION; KMNO4;

D O I：

10.1016/j.jssc.2009.01.031

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The K-birnessite (KxMnO2 center dot yH(2)O) reduction reaction has been tested in order to obtain manganese spinel nanoparticles. The addition of 0.25 weight percent of hydrazine hydrate, the reducing agent, during 24 hours is efficient to transform the birnessite powder in a hausmanite Mn3O4 powder. Well crystallised square shape nanoparticles are obtained. Different birnessite precursors have been tested and the reaction kinetics is strongly correlated to the crystallinity and granulometry of the precursor. The effects of aging time and hydrazine hydrate amount have been studied. Well crystallised Mn3O4 is obtained in one hour. The presence of feitknechtite (MnO(OH)) and amorphous nanorods has been detected as all intermediate phase during birnessite conversion into hausmanite. The conversion mechanism is discussed. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：1021 / 1026

页数：6

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