久效磷分子印迹聚合物分子识别特性的光谱研究

采用分子印迹技术合成了对有机磷农药久效磷有高度选择性的聚合物,通过1H NMR和紫外光谱研究了印迹聚合物的结合机理和识别特性。结果表明,该聚合物通过协同氢键作用形成1∶2型氢键配合物专一地结合久效磷。聚合物红外光谱研究表明,聚合物表面存在可与印迹分子相互作用的官能团。     

乙酰甲胺磷分子印迹聚合物识别特性的光谱研究

用紫外及红外分光光度法研究了印迹分子和单体之间的作用力,结果表明随着甲胺磷浓度的增加,紫外吸收曲线的最大吸收波长发生红移,说明两者之间存在氢键作用力;经红外光谱分析进一步表明乙酰甲胺磷的—NH和PO可以和甲基丙烯酸的—COOH之间有氢键作用。采用悬浮聚合法制备乙酰甲胺磷分子印迹聚合物微球,除去印迹分子的聚合物留下了对印迹分子特异识别的结合位点。此聚合物可用来做吸附填料,分离富集环境样品中的乙酰甲胺磷。     

1-氨基萘印迹聚合物分子识别特性的光谱学研究

采用分子自组装印迹技术合成了一种对1-氨基萘有高度选择性的分子印迹聚合物新材料。应用紫外光谱、红外光谱、X射线光电子能谱和1H核磁共振波谱等研究了印迹聚合物的结合位点和识别机理。结果表明模板分子与功能单体通过氢键作用形成1:1型配合物,配合物的稳定常数K=5.537×104L/mol。1-氨基萘分子氨基上的氮原子是质子接受体,功能单体甲基丙烯酸分子羧基上的氢原子是氢键的质子给予体,是与1-氨基萘形成氢键作用的选择性识别位点。利用平衡吸附试验研究了印迹聚合物的结合特性,表明印迹聚合物对1-氨基萘分子具有特异的识别性能。     

磺胺二甲嘧啶分子印迹聚合物制备与光谱特性

本研究以磺胺二甲嘧啶为模板分子,甲基丙烯酸为功能单体,低温紫外引发聚合制备分子印迹聚合物,用紫外光谱法对磺胺二甲嘧啶与甲基丙烯酸的结合作用及磺胺二甲嘧啶印迹聚合物的静态吸附性能和选择性能进行研究,试验结果表明,溶液中的功能单体与印迹分子之间产生了结合作用;与空白印迹聚合物相比,以甲基丙烯酸为功能单体、磺胺二甲嘧啶为模板的分子印迹聚合物展现了较高的结合容量,与其他结构类似的底物磺胺异唑相比,磺胺二甲嘧啶分子印迹聚合物对磺胺二甲嘧啶模板分子显示出明显的选择性和特异性,静态分配系数K_D可达282.3 mg·mL-1,分离因子α可达3.9,并预测磺胺二甲嘧啶分子印迹聚合物结合机理。分析了甲基丙烯酸、二甲基丙烯酸乙二醇酯和磺胺二甲嘧啶分子印迹聚合物的红外谱图,研究结果表明制备的磺胺二甲嘧啶印迹聚合物中CC双键峰很小,并且功能键羧酸键没有明显变化,经交联聚合得到的聚合物确实存在可以同印迹分子相互作用的化学基团。     

甲胺磷分子印迹聚合物的结合机理及其分子识别特性的光谱学研究

采用分子自组装印迹技术合成了一种新的对甲胺磷农药分子有高度选择性的分子印迹聚合物。在预聚合阶段,通过1H NMR,FTIR和UV光谱法研究了分子印迹聚合物的形成机理。结果表明模板分子和功能单体通过协同氢键作用形成1∶2型氢键配合物,配合物稳定常数K＝2.894×106 L2·mol-2,稳定性好。运用红外光谱法研究了印迹聚合物对模板分子的特异性识别作用,进一步表明印迹聚合物通过协同氢键作用特异性地识别模板分子。     

甲基对硫磷分子印迹聚合物光谱研究

以甲基对硫磷为模板分子,分别以甲基丙烯酸、丙烯酰胺和4-乙烯基吡啶为功能单体,合成了三种分子印迹聚合物。利用紫外光谱研究了甲基对硫磷与不同功能单体间作用力的大小,表明4-乙烯基吡啶与甲基对硫磷间的作用力明显强于另外两种单体。红外光谱研究表明4-乙烯基吡啶可以同模板分子的P—O—C和—NO₂部位发生反应,并形成稳定的共价化合物,而另外两种单体仅在P—O—C部位与模板分子缔合。此外,由三种分子印迹聚合物的红外光谱图可以看出,在聚合物表面确实存在着可与模板分子相互作用的官能团。     

分子印迹技术特异性识别头孢类分子的光谱研究

以头孢氨苄(CFL)为特异性分析识别对象,采用本体聚合和悬浮聚合两种聚合方法,制备了头孢氨苄分子印迹聚合物.紫外光谱研究证实模板分子CFL与内烯酰胺之间形成氢键型配合物.用红外光谱法分析了CFL分子印迹聚合物的聚合程度及聚合物表面上存在的功能基团.紫外光谱分析表明,用AM-EGD-MA体系和本体聚合法制备的印迹聚合物对...     

辛硫磷分子印迹聚合物的合成

以辛硫磷为模板分子,丙烯酰胺为功能单体,乙二醇二甲基丙烯酸酯为交联剂,偶氮二异丁腈为引发剂,在甲醇溶液中制备了辛硫磷分子印迹聚合物.该聚合物对模板分子具有良好的选择性,用作液相色谱固定相,很好地分离了模板分子及其结构类似物,结果令人满意.     

分子印迹聚合反应中功能单体与模板分子间作用力的光谱分析

要获得吸附性能良好的非共价型分子印迹聚合物,聚合前模板分子与功能单体的结合程度至关重要。而相关研究报道较少。文章采用紫外光谱并结合红外光谱分析法,研究了模板分子穿心莲内酯与功能单体丙烯酰胺(AM)在3种溶剂乙腈、四氢呋喃和乙酸乙酯中相互作用力的大小。实验结果发现,穿心莲内酯与AM在乙腈溶剂中,224nm处的紫外吸收峰发生蓝移,蓝移5nm,且吸收峰增强,红外光谱中O—H伸缩振动峰发生蓝移,蓝移近8cm-1,N—H伸缩振动峰蓝移近6cm-1,表明两者之间发生较强的蓝移氢键作用力;而它们在另两种溶剂中作用力很微弱。因此,加入功能单体后光谱改变越大分子间作用力越强,识别点的选择性越好,由此制备的分子印迹聚合物吸附性能越好。     

类特异性分子印迹聚合物微球的识别机理及其光谱学研究

以氯磺隆为模板分子,甲基丙烯酸二乙氨基乙酯为功能单体,三甲氧基丙烷三甲基丙烯酸酯为交联剂,乙腈为致孔剂,在60℃温度下,采用热引发沉淀聚合方法制备了一种能同时吸附氯磺隆、噻吩磺隆、单嘧磺隆的类特异性分子印迹微球,并运用紫外光谱、红外光谱法等手段对其识别机理进行研究。结果表明,该聚合物微球对氯磺隆及其分子结构类似物噻吩磺隆、单嘧磺隆具有类特异性吸附能力,同时揭示了分子印迹微球是通过氢键作用特异性地识别模板分子及其类似物。     

Preparation and Recognition Behavior Characterization of a Moncrotophos Molecularly Imprinted Polymer

In this study, a novel functionalized material was synthesized using moncrotophos as template molecule, methacrylic acid as functional monomer, and ethylene glycol dimethacrylate as cross-linker. The adsorption ability of the imprinted polymer toward moncrotophos was characterized by static adsorption experiments; the results showed that it had higher adsorption capacity than the non-imprinted polymer. Scatchard analysis indicated that the specific binding sites in the prepared material were heterogeneous and could be classified into two distinct groups. For the saturated adsorption capacity, (Q_max1) was 18.76 mg/g due to the high affinity binding sites, and the other saturated adsorption capacity (Q_max2) was 4.66 mg/g due to the low affinity binding sites. The prepared material also offered fast kinetics for adsorption and desorption of moncrotophos. After shaking for 90 min, an adsorption capacity of 4.48 mg/g was obtained. The material exhibited higher selective recognition properties toward moncrotophos than toward structurally related compounds. Thus, it had the potential to be used as a selective sorbent in solid-phase extraction.     

Preparation and Characterization of a Molecularly Imprinted Polymer for Selective Recognition of Trichlorfon and Monocrotophos

In this study, a molecularly imprinted polymer (MIP) that can selectively recognize both the trichlorfon and the structurally related compound of monocrotophos pesticides was prepared using mixtures of trichlorfon and monocrotophos as template molecules, methacrylic acid (MAA) as a functional monomer, and ethylene glycol dimethacrylate as a cross-linker. The polymerization conditions had an important influence on the adsorption ability of imprinted polymer. When the ratio of trichlorfon and monocrotophos was 1.5:1 (mol/mol), the MIP had high adsorption capacity. The prepared polymers were characterized by Fourier transform infrared spectroscopy and static and kinetic adsorption experiments. The results indicated that the P = O groups of trichlorfon and monocrotophos reacted with the -OH groups of MAA during the synthesis of MIP. The imprinted polymer exhibited good recognition ability and higher selectivity toward trichlorfon and monocrotophos than the structurally related pesticide compounds of acephate and methamidophos, and offered fast kinetics for solid phase by the MIP adsorption of trichlorfon and monocrotophos from liquid phase.     

Preparation and Characterization of a Novel Surface Molecularly Imprinted Polymer for Selective Recognition of Sudan III

In this study, a novel functionalized material for selective recognition of Sudan III was synthesized by a molecular imprinting technique in combination with a sol-gel process on the activated silica gel surface. The imprinted polymer was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, and adsorption experiments. The results showed that this material exhibited a high adsorption capacity with selective ability toward Sudan III. Its saturated binding capacity was 12.16 mg/g. It offered a fast kinetics for the adsorption of Sudan III; 71.67% of the saturated adsorption capacity was obtained within a shaking period of 5 min, and the adsorption equilibrium was almost reached within 120 min. With good performance, this functionalized polymer was suitable as a new selective sorbent for application in solid phase extraction.     

SiO2表面双酚A中空分子印迹纳米球的制备及识别性能

A novel and effective approach was developed to synthesize monodisperse hollow molecularly imprinted polymers (MHMIPs) with unfunctionalized SiO₂ spheres in a mixture of toluene and CH₃CN.The factors that affected the synthesis of MHMIPs were systematically investigated.It was determined that a suitable ratio of toluene to CH₃CN and the use of a functional monomer that can generate double H-bonding interactions were the critical factors to obtain MHMIPs with high uniformity and monodispersion.The obtained MHMIPs exhibited a fast adsorption rate and high adsorption capacity (270 μmol/g) for bisphenol A.As the shell thickness increased from 90 nm to 130 nm,the binding capacity of the imprinted shells decreased gradually.The relative selectivity coefficients of MHMIPs for tetra-bromobisphenol A (TBBPA),phenol and p-tert-butylphenol (PTBP) were calculated as 1.53,1.83 and 1.90,respectively.These findings indicate that MHMIPs have good adsorption performances and suggest applications in the selective removal or sensitive analysis of bisphenol A.