Synthesis and Characterization of Single-Crystalline MnFe2O4 Ferrite Nanocrystals and Their Possible Application in Water Treatment

✍ Scribed by YingQi Wang; RongMin Cheng; Zi Wen; LiJun Zhao

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 536 KB
• Volume: 2011
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.201100205

✦ Synopsis

Abstract

Manganese ferrite (MnFe~2~O~4~) nanospheres and nano‐octahedra with a narrow size distribution were synthesized by a simple solvothermal method. Here, potassium permanganate (KMnO~4~) was used as reactant and oxidant for the synthesis of MnFe~2~O~4~ ferrite nanocrystals. With the use of hydrazine hydrate, the oxidation rate of ferrous ions was kept under control, and the particle size of MnFe~2~O~4~ was limited. The results of control experiments reveal that alkalinity and type of solvent are important factors affecting the morphology and crystallization of MnFe~2~O~4~ nanocrystals. Both of the as‐prepared samples exhibit ferromagnetic behavior at room temperature. Especially, the saturation magnetization of MnFe~2~O~4~ nanospheres with 50 nm diameter is 79 emu/g, which is among the best values reported so far. The nanoparticles also showed good performance in removal of pollutants like Congo red, Cr^VI^, and Pb^II^ from water by adsorption, even at neutral pH.