The facile 3D self-assembly of porous iron hydroxide and oxide hierarchical nanostructures for removing dyes from wastewater
The facile 3D self-assembly of porous iron hydroxide and oxide hierarchical nanostructures for removing dyes from wastewater
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多孔氢氧化铁和氧化物分级纳米结构的轻松 3D 自组装用于去除废水中的染料
DOI：
10.1039/c3ta11938f
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发表时间：
2013-01-01
影响因子：
11.9
通讯作者：
Li, Junbai
中科院分区：
文献类型：
--
作者：
Fei, Jinbo;Zhao, Jie;Li, Junbai
我们报道了利用电偶电池反应在室温下通过简单且低成本的自组装过程来无模板地制备3D氢氧化铁分级纳米结构。反应体系中硫酸钠的存在是形成氢氧化铁分级纳米结构的关键。X-射线衍射分析表明，经过焙烧后的氢氧化铁纳米结构可以转变为磁性的铁氧化物。相关的扫描电子显微镜和透射电子显微镜图像表明，两种花状纳米结构都是由多孔纳米片组成的。我们还证明了上述两种分级纳米结构在分散在水中时是带负电荷的。与传统的α-FeOOH和α-Fe_2O_3纳米粒子相比，它们可以选择性地去除废水中的中性染料，具有很大的水处理潜力。
We report the template-free fabrication of 3D iron hydroxide hierarchical nanostructures through a simple and low-cost self-assembly process using a galvanic-cell reaction at room temperature. The existence of sodium sulfate in the reaction system is critical for formation of the iron hydroxide hierarchical nanostructures. X-ray diffraction analysis reveals that, after calcination, the iron hydroxide nanostructures can be changed into magnetic iron oxides. Relevant scanning electron microscopy and transmission electron microscopy images show that both of the flower-like nanostructures are composed of porous nanosheets. We also demonstrate that the two hierarchical nanostructures described above are negatively charged when dispersed in water. When used as adsorbents, they can selectively remove neutral dyes from wastewater with much higher capacities than those of conventional α-FeOOH and α-Fe2O3 nanoparticles, indicating great potential for use in water treatment.