| 核-壳表面磁性印迹聚合物的制备及其对水中双酚A的特异性去除 |
| 摘要点击 3201 全文点击 1756 投稿时间：2012-07-22 修订日期：2012-12-15 |
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| 中文关键词 双酚A 分子印迹 核-壳结构 吸附选择性 二级出水 |
| 英文关键词 bisphenol A molecularly imprinting core-shell structure adsorption selectivity MWTP effluents |
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| 中文摘要 |
| 采用表面印迹技术制备了核-壳结构的磁性分子印迹聚合物(Fe3 O4 @ SiO2-MIPs),在外磁场作用下该吸附剂很容易实现固-液分离. 采用X-射线衍射(XRD)、扫描电镜(SEM)和傅里叶变换红外光谱(FT-IR)对产物的结构进行了表征. 通过平衡吸附实验与斯卡查德(Scatchard)分析证实了Fe3O4@SiO2-MIPs对双酚A的吸附选择性. Freundlich模型拟合吸附等温线的相关系数R2=0.9952; 准二级动力学模型很好地拟合了吸附动力学,相关系数R2达到了0.9999. 在弱酸性条件下,制备的印迹材料表现出高吸附效率和快速的吸附动力学,达到90%的去除率仅需40 min; 各种离子的存在不影响双酚A的吸附率; 与非印迹聚合物(Fe3 O4 @ SiO2-NIPs)比较,Fe3 O4 @ SiO2-MIPs对湖水中加标的双酚A表现出显著的亲和性; 7次的重复使用而性能没有明显下降证明了Fe3 O4 @ SiO2-MIPs的可重复使用性. |
| 英文摘要 |
| This paper reports the preparation of surface-imprinted polymer core-shell magnetic material as adsorbent for separating bisphenol A in the environmental water. The adsorbent prepared easily achieved the magnetic separation under an external magnetic field. The structures of the resulting composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) analysis. The adsorption selectivity of Fe3 O4 @ SiO2-MIPs for bisphenol A was demonstrated by equilibrium rebinding experiments and Scatchard analysis. Freundlich adsorption model can well describe the adsorption isothermals of bisphenol A with the correlation coefficients R2=0.9952. The dynamics of bisphenol A adsorbed by Fe3 O4 @ SiO2-MIPs can be well described by the pseudo second-order model (R2=0.9999). In the solutions with weak acidity, the Fe3 O4 @ SiO2-MIPs showed higher removal rate and rapid adsorption dynamical process, requiring only 40 min to reach a removal rate of 90%; the presence of ions did not affect the adsorption rate of bisphenol A; when compared with the non-imprinted polymer (Fe3 O4 @ SiO2-NIPs),the Fe3 O4 @ SiO2-MIPs showed outstanding affinity toward bisphenol A; the performance of the resulting composites (Fe3 O4 @ SiO2-MIPs) without obvious deterioration was demonstrated in seven repeated cycles. |
