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(Fe3O4@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=0.995 2;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0.999 9.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(Fe3O4@SiO2-NIPs)比较,Fe3O4@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Fe3O4@SiO2-MIPs的可重复使用性.
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 Fe3O4@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 = 0.995 2.The dynamics of bisphenol A adsorbed by Fe3O4@SiO2-MIPs can be well described by the pseudo second-order model（R2 = 0.999 9）.In the solutions with weak acidity,the Fe3O4@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（Fe3O4@SiO2-NIPs）,the Fe3O4@SiO2MIPs showed outstanding affinity toward bisphenol A;the performance of the resulting composites（Fe3O4@SiO2-MIPs） without obvious deterioration was demonstrated in seven repeated cycles.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第6期2240-2248,共9页
Environmental Science
基金
国家自然科学基金项目(50878138)
关键词
双酚A
分子印迹
核-壳结构
吸附选择性
二级出水
bisphenol A
molecularly imprinting
core-shell structure
adsorption selectivity
MWTP effluents
