Recyclable CNTs/Fe3O4 magnetic nanocomposites as adsorbents to remove bisphenol A from water and their regeneration
Recyclable CNTs/Fe3O4 magnetic nanocomposites as adsorbents to remove bisphenol A from water and their regeneration
复制标题
可回收的CNT/Fe3O4磁性纳米复合材料作为吸附剂去除水中的双酚A及其再生
DOI：
10.1016/j.cej.2014.09.032
复制
发表时间：
2015-01-15
影响因子：
15.1
通讯作者：
Shu, Dong
中科院分区：
文献类型：
--
作者：
Li, Shuzhen;Gong, Yibin;Shu, Dong
采用水热法将碳纳米管(CNTs)接枝到磁性Fe3O4颗粒上，制备了磁性碳纳米管吸附剂CNTs/Fe3O4纳米复合材料。用X射线衍射仪、扫描电子显微镜、透射电子显微镜、傅立叶变换红外光谱、比表面积和磁性测试等手段对所制备的纳米复合材料进行了表征。考察了碳纳米管/Fe3O4纳米复合材料对水溶液中双酚A(BPA)的吸附性能。结果表明，碳纳米管/Fe3O4纳米复合材料对水溶液中的双酚A表现出较强的吸附行为，双酚A在碳纳米管/Fe3O4上的吸附符合Freundlich吸附等温式而不是Langmuir吸附等温式。此外，所用的碳纳米管/Fe3O4纳米复合材料通过外加磁场分离，分别通过甲醇洗涤或化学氧化法(Fe2+/H2O2、Na2SO3/Fe2+或UV/H2O2)进行再生。结果表明，作为一种可回收的吸附剂，碳纳米管/Fe3O4纳米复合材料可以通过磁分离保持较高的回收率(接近98%)，并在多次吸附-失活-再生循环后，将其吸附行为保持在极限(+/-1.34)以内。(C)2014爱思唯尔B.V.保留所有权利。
This paper presents the synthesis of magnetic carbon nanotube adsorbents, CNTs/Fe3O4 nanocomposites, in which carbon nanotubes (CNTs) were grafted to magnetic Fe3O4 particles by a facile hydrothermal method. The prepared CNTs/Fe3O4 nanocomposites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), the Brunauer-Emmett-Teller (BET) surface areas, and magnetic property measurements. The adsorption behaviors of the CNTs/Fe3O4 nanocomposites were evaluated for the removal of bisphenol A (BPA) in aqueous solution. It was found that the CNTs/Fe3O4 nanocomposites exhibited strong adsorption behavior for BPA in aqueous solution, and the adsorption of BPA onto the CNTs/Fe3O4 followed the Freundlich adsorption isotherm rather than the Langmuir adsorption isotherm. Moreover, the CNTs/Fe3O4 nanocomposites used, which were separated via an external magnetic field, were independently regenerated by methanol-wash or chemical oxidation methods (Fe2+/H2O2, Na2SO3/Fe2+, or UV/H2O2). The results demonstrated that as a recyclable adsorbent, CNTs/Fe3O4 nanocomposites can maintain a high recovery extent (similar to 98%) via magnetic separation and retain their adsorption behavior within the limits (+/- 1.34) after several adsorption-deactivation-regeneration cycles. (C) 2014 Elsevier B.V. All rights reserved.