A hierarchically porous MgFe2O4/γ-Fe2O3 magnetic microspheres for efficient removals of dye and pharmaceutical from water
A hierarchically porous MgFe2O4/γ-Fe2O3 magnetic microspheres for efficient removals of dye and pharmaceutical from water
复制标题
分层多孔 MgFe2O4/γ-Fe2O3 磁性微球可有效去除水中的染料和药物
DOI：
10.1016/j.cej.2015.07.081
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发表时间：
2016-01-01
影响因子：
15.1
通讯作者：
Ng, Dickon H. L.
中科院分区：
文献类型：
--
作者：
Lu, Lu;Li, Jia;Ng, Dickon H. L.
报道了一种新型的多级多孔MgFe 2 O 4/γ-Fe 2 O3磁性微球对水中染料和药物的吸附性能。以松花粉为模板，采用廉价、无毒、简便的方法，在γ-Fe_2O_3基体上自发形成MgFe_2O_4纳米粒子。所制备的花粉状MgFe 2 O 4/γ-Fe 2 O3具有由粒径为8 nm的纳米微晶组成的分级多孔结构。研究了MgFe_2 O_4/γ-Fe_2 O_3和γ-Fe_2 O_3对刚果红（CR）和米诺环素（MC）的吸附动力学、平衡和热力学。合成的磁性微球具有良好的吸附性能。对刚果红和米诺环素的最大吸附容量分别为259.1mg/g和200.8mg/g。结果表明，该吸附剂对刚果红和米诺环素的吸附动力学和吸附等温线分别符合准二级动力学和Langmuir单分子层吸附模型，吸附过程为自发吸热过程.吸附后的样品可用甲醇或氢氧化钠溶液再生，易于从水溶液中磁分离。合成的材料可能作为环境过程的优良吸附剂。(C)2015 Elsevier B. V.版权所有。
Hierarchically porous MgFe2O4/gamma-Fe2O3 magnetic microspheres were reported as novel efficient adsorbent for the removals of dye and pharmaceutical from water. The spontaneous formation and organization of nanoparticles of MgFe2O4 on gamma-Fe2O3 matrix was based on a cheap, nontoxic and facile technique involving using pine pollen as template. The as-prepared pollen-morphic MgFe2O4/gamma-Fe2O3 exhibited hierarchically porous structure composed of nanocrystallites with grain sizes of 8 nm. The adsorption kinetics equilibrium and thermodynamics of congo red (CR) and minocycline (MC) onto MgFe2O4/gamma-Fe2O3 and gamma-Fe2O3 were investigated. The as-synthesized magnetic microspheres exhibited excellent adsorption performances. Maximum adsorption capacities of 259.1 mg/g and 200.8 mg/g were obtained for congo red and minocycline, respectively. The adsorption kinetics and isotherm of congo red and minocycline onto the as-synthesized samples followed the pseudo-second-order and Langmuir monolayer model, respectively, and the adsorption processes were spontaneous and endothermic in nature. The adsorbed samples could be regenerated by methanol or NaOH solution, and easily magnetically separated from aqueous solution. The synthesized materials might act as excellent adsorbents for environmental processes. (C) 2015 Elsevier B.V. All rights reserved.