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首页> 外文期刊>RSC Advances >Facile preparation of a tetraethylenepentamine-functionalized nano magnetic composite material and its adsorption mechanism to anions: competition or cooperation
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Facile preparation of a tetraethylenepentamine-functionalized nano magnetic composite material and its adsorption mechanism to anions: competition or cooperation

机译：四亚乙基五胺功能化纳米磁性复合材料的简便制备及其对阴离子的吸附机理：竞争或协同作用

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A tetraethylenepentamine (TEPA)-functionalized nano-Fe _(3) O _(4) magnetic composite material (nFe _(3) O _(4) @TEPA) was synthesized by a facile one-pot solvothermal method. It was characterized by elementary analysis (EA), powder X-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR), transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM). The results show that the nFe _(3) O _(4) @TEPA has an average size of ～20 nm, with a saturation magnetization intensity of 48.2 emu g ~(?1) . Its adsorption properties were investigated by adsorbing fluorine ions, phosphate, Cr( VI ) and their co-existing water system. The adsorption performance was studied as a function of solution pH, initial concentration of ions, contact time and temperature for each ion. The adsorption of the multi-ion co-existing system was studied via batch tests, XPS and FTIR analyses. The effect of co-existing ions was studied through Box-Behnken Design (BBD) and response surface methodology (RSM). It can be deducted that the adsorption mechanism of an individual fluorine ion or phosphate was mainly related to electrostatic attraction, while that of Cr( VI ) might be mainly related to electrostatic attraction and coordination interactions. For the fluorine ion and phosphate bi-component system, their adsorption was competitive via ion exchange. For the Cr( VI ), fluorine ion and phosphate tri-component co-existing system, Cr( VI ) took priority for adsorption and could replace the absorbed fluorine ion or phosphate by competitive reaction, but not vice versa .
机译：通过简便的一锅溶剂热法合成了四亚乙基五胺（TEPA）功能化的纳米Fe _（3）O _（4）磁性复合材料（nFe _（3）O _（4）@TEPA）。它的特征在于元素分析（EA），粉末X射线衍射（XRD），傅里叶变换红外光谱（FTIR），透射电子显微镜（TEM）和振动样品磁强（VSM）。结果表明，nFe _（3）O _（4）@TEPA的平均粒径约为20 nm，饱和磁化强度为48.2 emu g〜（？1）。通过吸附氟离子，磷酸盐，Cr（VI）及其共存的水体系，研究了其吸附性能。研究了吸附性能与溶液pH，离子初始浓度，每种离子的接触时间和温度的关系。通过批量测试，XPS和FTIR分析研究了多离子共存系统的吸附。通过Box-Behnken设计（BBD）和响应面方法（RSM）研究了共存离子的影响。可以推论单个氟离子或磷酸根的吸附机理主要与静电吸引有关，而Cr（VI）的吸附机理可能主要与静电吸引和配位相互作用有关。对于氟离子和磷酸根双组分系统，它们的吸附通过离子交换具有竞争性。对于Cr（VI），氟离子和磷酸盐三组分共存体系，Cr（VI）优先吸附，并且可以通过竞争反应替代吸收的氟离子或磷酸盐，反之则不然。

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