Effects of synthesis conditions on structure and magnetic properties of MnFe2O4 particles

IF 1.8 4区 材料科学 Q4 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Green Materials Pub Date : 2021-09-13 DOI:20.00010
Nguyen Van Quang, Pham Thi Lan Huong, Nguyen Tu, Nguyen Thi Huyen, Nguyen Tri Tuan, Manh Trung Tran, Anh-Tuan Le
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引用次数: 0

Abstract

Manganese ferrite (MnFe2O4) nanoparticles were synthesized through a coprecipitation method using manganese (II) chloride tetrahydrate (MnCl2·4H2O) and ferric chloride hexahydrate (FeCl3·6H2O) as precursors. The scanning electron microscopy images showed that the as-synthesized particles were granular and about 20 nm. The X-ray diffraction patterns revealed that the manganese ferrite phase was completely decomposed into ferric oxide (Fe2O3) and manganese (III) oxide (Mn2O3) after annealing above 800°C in air. In contrast, its crystalline quality significantly improved when it was annealed in argon. By using the vibrating-sample magnetometry technique, it was demonstrated that the saturation magnetization (M s) of the as-prepared sample (~36.6 emu/g) decreased sharply up to ~5 emu/g after annealing at 1000°C in air and significantly increased to ~77.6 emu/g when it was annealed at 1000°C in argon. Under sunlight radiation, a higher efficiency was observed for manganese ferrite particles annealed in argon in the presence of hydrogen peroxide (H2O2), mainly due to the Fenton reaction between manganese ferrite and hydrogen peroxide. The authors suggest that the presence of hydrogen peroxide and the enhancement of the crystalline quality of the manganese ferrite phase are the two leading factors in improving methylene blue degradation efficiency.
合成条件对MnFe2O4颗粒结构和磁性能的影响
以四水氯化锰(MnCl2·4H2O)和六水氯化铁(FeCl3·6H2O)为前驱体,采用共沉淀法合成了铁酸锰(MnFe2O4)纳米颗粒。扫描电镜图像显示,合成的颗粒呈颗粒状,粒径约为20 nm。x射线衍射图表明,在800℃以上的空气中退火后,锰铁氧体相完全分解为氧化铁(Fe2O3)和氧化锰(Mn2O3)。在氩气中退火后,其结晶质量明显改善。用振动样品磁强计技术表明,制备的样品(~36.6 emu/g)在1000℃空气中退火后,饱和磁化强度(M s)急剧下降至~5 emu/g,在1000℃氩气中退火后,饱和磁化强度(M s)显著提高至~77.6 emu/g。在阳光辐射下,在过氧化氢(H2O2)存在下,铁酸锰颗粒在氩气中退火时具有较高的效率,这主要是由于铁酸锰与过氧化氢之间的芬顿反应。作者认为过氧化氢的存在和铁酸锰相结晶质量的提高是提高亚甲基蓝降解效率的两个主要因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Green Materials
Green Materials Environmental Science-Pollution
CiteScore
3.50
自引率
15.80%
发文量
24
期刊介绍: The focus of Green Materials relates to polymers and materials, with an emphasis on reducing the use of hazardous substances in the design, manufacture and application of products.
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