High-quality elliptical iron glycolate nanosheets: selective synthesis and chemical conversion into FexOy nanorings, porous nanosheets, and nanochains with enhanced visible-light photocatalytic activity.
High-quality elliptical iron glycolate nanosheets: selective synthesis and chemical conversion into FexOy nanorings, porous nanosheets, and nanochains with enhanced visible-light photocatalytic activity.
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DOI：
10.1039/c5nr03689e
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发表时间：
2015-10
期刊：
影响因子：
6.7
通讯作者：
Guoxiu Tong;Yun Liu;Tong Wu;Yucheng Ye;Chaoli Tong
中科院分区：
文献类型：
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作者：
Guoxiu Tong;Yun Liu;Tong Wu;Yucheng Ye;Chaoli Tong
本文介绍了一种新颖的、简单的多元醇介导的溶剂热合成椭圆型糖酸铁纳米片（IGNSs）的方法，并结合前驱体热转化为γ-Fe2O3和α-Fe2O3/γ-Fe2O3多孔纳米片（PNSs）、α-Fe2O3纳米链（nc）和椭圆型Fe3O4纳米片（NRs）。在铁（III）盐、乙二醇、聚乙二醇和乙二胺的存在下，通过氧化还原和共沉淀反应制备了igns。控制铁（3+）浓度、温度和时间可以显著地调节产物的大小和相。在不同退火温度和气氛下热处理后，IGNSs可转变为γ-Fe2O3和α-Fe2O3/γ-Fe2O3 PNSs、α-Fe2O3 NCs和椭圆形Fe3O4 NRs。PNSs和NCs分别表现出较高的软磁性能和矫顽力。在H2O2存在下，PNSs和NCs对RhB的可见光催化活性与相、SBET、尺寸、孔隙度和局部结构有关，顺序为：α-Fe2O3 NCs > α-Fe2O3/γ-Fe2O3 PNSs > γ-Fe2O3 PNSs > IGNSs。特别是α-Fe2O3/γ-Fe2O3 PNSs具有明显增强的光催化活性，具有良好的可回收性，并且由于磁化强度高，可以方便地通过外加磁场分离。我们认为制备的α-Fe2O3/γ-Fe2O3 PNSs在废水处理和微波吸收方面具有潜在的实际应用价值。
This paper describes an original and facile polyol-mediated solvothermal synthesis of elliptical iron glycolate nanosheets (IGNSs) combined with precursor thermal conversion into γ-Fe2O3 and α-Fe2O3/γ-Fe2O3 porous nanosheets (PNSs), α-Fe2O3 nanochains (NCs), and elliptical Fe3O4 nanorings (NRs). The IGNSs were produced via the oxidation-reduction and co-precipitation reactions in the presence of iron(III) salts, ethylene glycol, polyethylene glycol, and ethylenediamine. Control over Fe(3+) concentration, temperature, and time can considerably modulate the size and phase of the products. The IGNSs can be transformed to γ-Fe2O3 and α-Fe2O3/γ-Fe2O3 PNSs, α-Fe2O3 NCs, and elliptical Fe3O4 NRs by heat treatment under various annealing temperatures and ambiences. The PNSs and NCs exhibited high soft magnetic properties and coercivity, respectively. Visible-light photocatalytic activity toward RhB in the presence of H2O2 by PNSs and NCs was phase-, SBET, size-, porosity-, and local structure-dependent, following the order: α-Fe2O3 NCs > α-Fe2O3/γ-Fe2O3 PNSs > γ-Fe2O3 PNSs > IGNSs. In particular, α-Fe2O3/γ-Fe2O3 PNSs possessed significantly enhanced photocatalytic activity with good recyclability and could be conveniently separated by an applied magnetic field because of high magnetization. We believe that the as-prepared α-Fe2O3/γ-Fe2O3 PNSs have potential practical use in waste water treatment and microwave absorption.