A facile synthesis of Mn3O4/Fe3O4 superparamagnetic nanocomposites by chemical precipitation: Characterization and application in dye degradation

被引：34

作者：

Silva, Gabriela C. ^{[1
]}

Ciminelli, Virginia S. T. ^{[1
]}

Ferreira, Angela M. ^{[2
]}

Pissolati, Nathalia C. ^{[2
]}

Paiva, Paulo Renato P.

Lopez, Jorge L. ^{[3
]}

机构：

[1] Univ Fed Minas Gerais, Dept Met & Mat Engn, BR-31270901 Belo Horizonte, MG, Brazil

[2] Ctr Fed Educ Tecnol Minas Gerais CEFET MG, Dept Chem, BR-30421169 Belo Horizonte, MG, Brazil

[3] Univ Fed Acre UFAC, Ctr Ciencias Biol & Nat, Rio Branco, AC, Brazil

来源：

MATERIALS RESEARCH BULLETIN | 2014年 / 49卷

关键词：

Composites; Nanostructures; Chemical synthesis; Catalytic properties; Magnetic properties; PHOTOCATALYTIC ACTIVITY; REMOVAL; NANOPARTICLES; CONTAMINANTS; ADSORBENT; OXIDATION; CDS;

D O I：

10.1016/j.materresbull.2013.09.039

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Degradation of methylene blue (MB) is investigated using Mn3O4 as an oxidant. Discrete Mn3O4 particles and Mn3O4/Fe3O4 nanocomposites are synthesized via coprecipitation by using air as an oxidant in the absence and presence of previously synthesized magnetite nanoparticles, respectively. Characterization results show that superparamagnetic magnetite nanoparticles of 10 nm were synthesized. The Mn3O4 synthesis in the presence of these magnetite nanoparticles favors the formation of a pure, highly ordered Mn3O4/Fe3O4 superparamagnetic nanocomposite, which can be separated by an external magnetic field. This nanocomposite is applied to the oxidative decolorization of methylene blue (MB) and is capable of catalyzing the complete N-demethylation of MB, forming thionine as the final product and removing 93% of the dye in approximately 1 h. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：544 / 551

页数：8

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