具有高选择性吸附的表面分子印迹磁性纤维素微球的制备与性能

Preparation and Properties of Surface Imprinted Magnetic Cellulose Microsphere with Highly Selective Adsorption

以纤维素和纳米Fe_3O_4为原料制得磁性纤维素微球,在纤维素微球表面选择合适的模板分子,以甲基丙烯酸、丙烯酰胺和N,N'-亚甲基双丙烯酰胺为功能单体,采用水溶液聚合法制得表面分子印迹磁性纤维素微球.采用傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)和振动样品磁强计(VSM)等表征了分子印迹聚合物微球的结构.以罗丹明B(Rh B)为模板分子,通过吸附动力学与吸附热力学实验研究了表面分子印迹磁性纤维素微球对Rh B的吸附性能,结果表明,制备的表面分子印迹磁性纤维素微球对罗丹明B具有特异性识别作用,饱和吸附量达到0.542 mg/mg,吸附平衡时间为10 h左右.表面分子印迹磁性纤维素微球大大降低了对吸附环境的依赖,并可重复利用.

Molecularly imprinted magnetic composite microspheres（ MIP-MCM） were prepared by a surface functional monomer-directing system. Cellulose and Fe3O4 composite microsphere was the core and then was coated a layer of MIP on the surface. Fourier transform Infrared spectra（ FTIR）,X-ray powder diffraction（ XRD）,vibrating sample magnetometry（ VSM） methods were used to characterize the structure of MIP-MCM.In this article,Rhodamine B（ Rh B） was chosen as the template molecule. The adsorption abilities of MIPMCM toward Rh B were studied through adsorption kinetics and adsorption thermodynamics. The adsorption kinetics curves met pseudo-second-order model more. The adsorption isotherms could be described by both Langmuir and Freundlich isotherm models. The maximum adsorption amount was calculated to be 0. 542 mg/mg,much higher than the common adsorbents. MIP-MCM was also adsorption-selective to Rh B with highly regenerate and kept stable in a wild p H and temperature range. In brief,MIP-MCM is very potential in the application of removal of dye and sewage treatment.