温敏型表面离子印迹聚合物的制备及性能

Preparation and Properties of Temperature Sensitive Surface Ion Imprinted Polymers

摘要:

摘要：以多壁碳纳米管为(MWCNTs)为基质，N-异丙基丙烯酰胺(NIPAM)为温敏单体，丙烯酰胺、丙烯酸为功能单体，N,N-亚甲基双丙烯酰胺为交联剂，Ni2+为模板，采用反相悬浮法制备温敏型离子印迹材料(IIPs)。采用FTIR、XRD、TG、SEM等对其进行结构表征，采用丁二酮肟可见分光光度法对印迹聚合物的吸附性能进行了考察。结果表明：通过改变温度可以控制印迹聚合物的吸附与脱附效率，在最佳吸附温度40 ℃的条件下，IIPs对Ni2+吸附量最大为33.80 mg/g，该吸附过程符合热力学Langmuir模型和二级动力学模型，在25 ℃时的脱附效率远大于在50 ℃的脱附效率。在竞争离子Pb2+和Cd2+存在时，Ni2+/Pb2+和Ni2+/Cd2+的选择系数分别为12.62和16.12，说明IIPs对具有Ni2+较强的识别能力。

Abstract:

Abstract: A novel nickel ion imprinted polymers (IIPs) based on multi-walled carbon nanotubes (MWCNTs) were synthesized in inverse emulsion system, using N-isopropyl acrylamide (NIPAM) and Methyl methacrylate, Acrylic acid as the functional monomers, Ni(II) as the template,and N,N-methylene bis-acrylamide as the cross-linker.The as-prepared IIPs were characterized by Fourier transform infrared spectrometer (FTIR), X-ray diffraction (XRD), thermogravimetry (TG) and scanning electron microscopy (SEM). The adsorption properties of the imprinted polymer were investigated by spectrophotometry.The adsorption properties of ion imprinted polymers were investigated by dimethylglyoxime visible spectrophotometry.At the optimum adsorption temperature of 40 ℃, the maximum adsorption of Ni2+ by IIPs is 33.80 mg/g. The studies indicated that The adsorption and desorption efficiency of imprinted polymers can be controlled by changing the temperature, the adsorption process obeyed the thermodynamic Langmuir model, the second-order kinetic model. The desorption efficiency at 25 ℃ is much greater than the desorption efficiency at 50 ℃. In the presence of competitive ions Pb2+ and Cd2+, the selection coefficients of Ni2+/Pb2+ and Ni2+/Cd2+ are 12.62 and 16.12, respectively, indicating that IIPs really have a strong ability to recognize Ni2+.