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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Nano gamma-Fe2O3/bentonite magnetic composites: Synthesis, characterization and application as adsorbents
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Nano gamma-Fe2O3/bentonite magnetic composites: Synthesis, characterization and application as adsorbents

机译：纳米γ-Fe2O3/膨润土磁性复合材料：吸附剂的合成，表征及应用

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摘要

Nano gamma-Fe2O3 modified bentonite magnetic composites (gamma-Fe2O3/Bent) were synthesized via an annealing approach of the ferric oleate and bentonite compounds. The gamma-Fe2O3 nanoparticles with narrow size distribution and an average diameter of 32 nm were equably dispersed on the surface and between layers of the bentonite nanosheets, which mainly owed to the complete mixture of ferric oleate and hydrophobic modified bentonite. The gamma-Fe2O3/Bent composites exhibited typical ferromagnetic characteristics with the saturation magnetization of 22.31 emu/g and coercivity of 209 Oe. Adsorption performance measurement indicated that the gamma-Fe2O3/Bent composites are a kind of excellent adsorbent with fast adsorption rate, high adsorption capacity, 99.99% removal rate and easily magnetic separation process for the removal of cationic dye methylene blue (MB). Adsorption kinetics and isotherms were studied to describe the adsorption process, and the electrostatic adsorption mechanism was confirmed by zeta potential measurement. (C) 2016 Elsevier B.V. All rights reserved.
机译：通过油酸铁和膨润土化合物的退火方法合成了纳米γ-Fe2O3改性膨润土磁性复合材料（γ-Fe2O3/ Bent）。膨润土纳米片的表面和各层之间均匀分布着粒度分布窄，平均直径为32 nm的γ-Fe2O3纳米颗粒，这主要归因于油酸铁和疏水改性膨润土的完全混合。 γ-Fe2O3/ Bent复合材料表现出典型的铁磁特性，饱和磁化强度为22.31 emu / g，矫顽力为209 Oe。吸附性能测试表明，γ-Fe2O3/ Bent复合材料是一种吸附速度快，吸附能力强，去除率高达99.99％，易于磁选去除阳离子染料亚甲基蓝（MB）的优良吸附剂。研究了吸附动力学和等温线以描述吸附过程，并通过ζ电势测定证实了静电吸附机理。 （C）2016 Elsevier B.V.保留所有权利。

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