磁性伊利石表面分子印迹材料的制备及其对环丙沙星识别特性研究

利用溶剂热法制备磁性伊利石(MILT),以乙烯基功能化的磁性伊利石(MILT-MPS)为基质材料,通过表面引发原子转移自由基聚合法在甲醇/水的混合溶液中制备表面分子印迹材料(MMIPs)。通过 FT-IR、TEM、TGA、XRD 和 VSM 等方法对其物理化学性质进行了表征,其比表面积为109.58 m2/ g,且具有热稳定性、超顺磁性(Ms =3.866 emu/ g)。吸附实验研究表明,Langmuir 等温模型能较好地拟合 MMIPs 对 CIP 的吸附平衡数据,25℃时 MMIPs 的单分子层吸附容量为86.58 mg/ g。选择性识别实验表明,MMIPs 对 CIP 具有较好地选择性识别性。结合高效液相色谱分析技术,将所制备的 MMIPs 应用于环境样品中 CIP 的分离富集和分析测定,方法回收率为93.4%~98.3%,检出限达0.01 mg/ L。

Selective Recognition of Ciprofloxacin from Aqueous Solution by Molecularly Imprinted Polymers Based on Magnetic Illite

The magnetic Illite ( MILT) was firstly prepared by an effective polyol-medium solvothermal method. Based on these 3-( methacryloyloxy) propyl trimethoxysilane ( MILT-MPS), magnetic molecularly imprinted polymers (MMIPs) were further synthesized via atom transfer radical polymerization in a mixture solution of methanol and deionized water. The as-prepared MMIIPs were characterized by FT-IR, TEM), XRD, TGA and vibrating sample magnetometer (VSM), and the results indicated that the MMIIPs exhibited magnetic sensitivity ( Ms =3. 866 emu / g ), thermal stability and a larger specific surface area (109. 58 m2 / g). The batch mode adsorption studies were carried out to investigate the recognition specificity and selective capacity. The Langmuir isotherm model was fitted to the equilibrium data, and the monolayer adsorption capacity of MMIPs at 25℃ was 86. 58 mg / g. The selective recognition experiments demonstrated high affinity and selectivity of MMIPs towards ciprofloxacin ( CIP) over competitive compounds. Combined with high performance liquid chromatographic analysis technology, the prepared MMIIPs were successfully applied to extract and enrich trace CIP in environmental samples with the CIP recoveries from 93. 4% to 98. 3% and the limit of detection of 0. 01 mg / L.