Sonohydrothermal synthesis of MFe2O4 magnetic nanoparticles for adsorptive removal of tetracyclines from water
Sonohydrothermal synthesis of MFe2O4 magnetic nanoparticles for adsorptive removal of tetracyclines from water
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DOI：
10.1016/j.seppur.2013.03.046
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发表时间：
2013-09-30
影响因子：
8.6
通讯作者：
Chang, Jih-Hsing
中科院分区：
文献类型：
--
作者：
Bao, Xiaolei;Qiang, Zhimin;Chang, Jih-Hsing
采用改进的超声水热法合成了一系列单分散磁性纳米粒子MFe 2 O 4（M = Fe-II，M-II，Co-II，Zn-II），并对其结构进行了表征。考察了NaOH浓度和水热温度对MFe 2 O 4纳米颗粒晶化的影响。之后，将合成的纳米颗粒应用于从水中去除三种常用的四环素类（TC），包括四环素（TCN）、土霉素（OTC）和金霉素（CTC）。在5 mm范围内，土霉素的去除率均大于96%。土霉素在MFe 2 O 4纳米颗粒上的吸附动力学符合准二级动力学模型。基于TCs的官能团和MFe 2 O 4的表面活性位，提出了吸附机理。用过的纳米颗粒可以很容易地再生甲醇溶液（60%，v/v）和回收的有效去除TC。本研究表明，声热法是一种无毒，方便，成本效益高的磁性纳米粒子的合成，具有潜在的应用在水处理去除微污染物。(C)2013爱思唯尔有限公司版权所有。
A series of monodisperse magnetic nanoparticles (NPs) MFe2O4 (M = Fe-II, M-II, Co-II, Zn-II) was synthesized through an improved sonohydrothermal method and then characterized for their structural properties. NaOH concentration and hydrothermal temperature were examined for their effects on the crystallization of MFe2O4 NPs. Thereafter, the synthesized NPs were applied to remove three commonly-used tetracyclines (TCs) from water, including tetracycline (TCN), oxytetracycline (OTC), and chlortetracycline (CTC). High removal efficiencies (>= 96%) were achieved for all the selected TCs within 5 mm. The adsorption kinetics of OTC on MFe2O4 NPs could be expressed well by the pseudo-second-order model. Based on the functional groups of TCs and the active surface sites of MFe2O4, the adsorption mechanisms were proposed. The used NPs could be regenerated easily by a methanol solution (60%, v/v) and recycled for the effective removal of TCs. This study demonstrates that the sonohydrothermal method is nontoxic, convenient and cost-effective for the synthesis of magnetic NPs which have potential applications in water treatment for removal of micro-pollutants. (C) 2013 Elsevier B.V. All rights reserved.