Effect of cobalt substitution on structural and magnetic properties and chromium adsorption of manganese ferrite nano particles
Effect of cobalt substitution on structural and magnetic properties and chromium adsorption of manganese ferrite nano particles
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DOI：
10.1016/j.jmmm.2014.07.030
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发表时间：
2014-12-01
影响因子：
2.7
通讯作者：
Ranjithkumar, V.
中科院分区：
文献类型：
--
作者：
Ahalya, K.;Suriyanarayanan, N.;Ranjithkumar, V.
采用共沉淀法，在pH值为11，退火温度为900 ℃的条件下合成了锰铁氧体（MnFe 2 O 4）和钴掺杂锰铁氧体（Mn 1-xCoxFe 2 O 4）（x=0，0.2，0.4，0.6和0.8）。发现颗粒尺寸在30-35 nm的范围内。不同的掺杂剂浓度会影响样品的结晶边缘、表面形貌和磁性。对于钴的掺入，粒度最初增加至x=0.6，然后减小。随着钴浓度的增加，饱和磁化强度增加到x=0.6，然后降低。注意到四面体和八面体位置处的键的拉伸和弯曲，并且它们向较长波长移动。测试样品作为有毒重金属Cr（VI）的吸附剂的应用。研究了吸附效率随样品掺杂浓度、吸附剂用量和铬浓度的变化规律。(C)2014爱思唯尔有限公司版权所有。
Manganese ferrite (MnFe2O4) and cobalt doped manganese ferrite (Mn1-xCoxFe2O4) with x=0, 0.2, 0.4, 0.6, and 0.8 are synthesized at pH 11 and an annealing temperature of 900 degrees C, through co-precipitation technique. The particle sizes are found to be in the range of 30-35 nm. The varying dopant concentrations influence the crystalline edges, surface morphology and magnetic properties of the samples. Particle size initially increases for the incorporation of cobalt up to x=0.6 and then decreases. As cobalt concentration increases, the saturation magnetization increases up to x=0.6 and then decreases. Stretching and bending of bonds at tetrahedral and octahedral sites respectively are noticed and they shift towards the longer wavelengths. The samples are tested for their application as adsorbents of toxic heavy metal Cr(VI). The adsorption efficiency variations with dopant concentrations of samples, quantity of adsorbent and concentrations of chromium are studied. (C) 2014 Elsevier B.V. All rights reserved.