Preparation,Characterization and Adsorption Properties of Hydrophilic Syringostrobin Molecularly Imprinted Microspheres
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摘要: 本文以丁香菌酯为模板，甲基丙烯酸羟丙酯（HPMA）为亲水性功能单体，通过沉淀聚合法制备了亲水性丁香菌酯分子印迹微球（HMIMs），并采用紫外分光光度计，扫描电子显微镜（SEM）和激光粒度分析仪对亲水性丁香菌酯分子印迹微球（HMIMs）和非印迹微球（HNIMS）进行粒径、单分散性及形貌分析。通过动力学吸附、等温吸附和选择性吸附研究了HMIMs在水介质中对丁香菌酯的吸附性能。结果显示，模板分子、功能单体与交联剂形成稳定复合物的印迹微球摩尔比例为1：6：30，在此比例下制备的HMIMs中存在一种结合位点且外形良好、粒径排列紧密且具有单分散性。其准二级动力学模型（Pscudo-second-order-model）表明丁香菌酯与HMIMs的吸附过程属于化学吸附。在等温吸附实验中，HMIMs的Langmuir理论最大吸附量分别为53.35 mg/g（318 K）、41.69 mg/g（298 K）和39.42 mg/g（278 K），说明当温度为318 K时，吸附效率最高。且HMIMs在水介质中对丁香菌酯的吸附能力高于HNIMs，说明HMIMs与HNIMs相比具有良好的亲水性。Langmuir吸附等温线说明HMIMs对丁香菌酯的吸附属于单分子层吸附。选择性吸附表明HMIMs对丁香菌酯具有高度特异性识别。环境水样的加标回收率为85.85%~87.96%。Abstract: In this paper,hydrophilic coumoxystrobin molecularly imprinted microspheres(HMIMs)were prepared by precipitation polymerization using coumoxystrobin as template and hydroxypropyl methacrylate(HPMA)as hydrophilic functional monomer. The hydrophilic HMIMs and HNIMs were characterized by UV spectrophotometer,scanning electron microscope(SEM)and laser particle size analyzer. The particle size,monodispersity and morphology were analyzed. The adsorption properties of HMIMs for coumoxystrobin in aqueous media were studied by kinetic adsorption,equilibrium adsorption and selective adsorption. The results showed that the molar ratio of template molecule,functional monomer and crosslinker to form stable complex was 1:6:30. There was a binding site in HMIMs with good shape,close particle size and monodispersity. The pseudo second order model showed that the adsorption process of coumoxystrobin with HMIMs belonged to chemical adsorption. In the adsorption isotherm experiment,the Langmuir theoretical maximum adsorption capacity of HMIMs was 53.35 mg/g(318 K),41.69 mg/g(298 K)and 39.42 mg/g(278 K),respectively,indicating that when the temperature was 318 K,the adsorption efficiency was the highest. The adsorption capacity of HMIMs for butyricide in aqueous medium was higher than that of HNIMs,indicating that HMIMs had better hydrophilicity than HNIMs. Langmuir adsorption isotherm indicated that the adsorption of coumoxystrobin by HMIMs belonged to single molecular layer adsorption. Selective adsorption indicated that HMIMs had high specificity for coumoxystrobin. The recoveries of environmental water samples were 85.85%~87.96%.
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Keywords:
- coumoxystrobin /
- hydrophilic /
- molecularly imprinted microspheres /
- preparation /
- characterization
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