白杨素分子印迹聚合物的制备及其性能评价

以白杨素为模板分子,硅胶为载体,丙烯酰胺为功能单体,采用表面印迹法制备白杨素分子印迹聚合物。并通过红外光谱测定,吸附实验等对印迹聚合物进行表征及性能评价。静态吸附实验表明,印迹聚合物对模板分子的吸附量远远高于非印迹聚合物;印迹聚合物及非印迹聚合物对白杨素、氯霉素、甲砜霉素的选择吸附表明,所制备的分子印迹聚合物对白杨素有特异性吸附效果。     

虚拟模板印迹法制备苯酚分子印迹聚合物用以吸附微量甲苯

甲苯是一种缺乏印迹位点的小分子,为实现对甲苯的印迹,以甲基丙烯酸为单体分子,苯酚为模板分子,二乙烯基苯作为交联剂,采用沉淀聚合法制备虚拟模板苯酚分子印迹聚合物(MIPs).通过改变溶剂用量、交联剂与单体分子的配比等方式考察了苯酚分子印迹聚合物最佳成球条件并最终制备出粒径均匀的苯酚分子印迹聚合物.之后使用该苯酚印迹聚合物与课题组前期制备的苯胺分子印迹聚合物进行了结构、形貌和吸附性能的对比,验证了虚拟模板分子印迹聚合物对甲苯分子实现特异性吸附的可行性.经气相色谱仪表征,该分子印迹聚合物对甲苯的吸附能力为6.78 mg·g-1,优于苯胺分子印迹聚合物的1.89 mg·g-1.     

罗丹明B分子印迹聚合物的制备及分子识别性能研究

以三苯甲烷类碱性染料罗丹明B为模板分子,丙烯酰胺为功能分子,N,N-亚甲基双丙烯酰胺(MBA)为交联剂,采用表面修饰分子印迹法,制备对罗丹明B具有特定亲和选择性的分子印迹聚合物。应用红外光谱对印迹聚合物进行表征,通过静态吸附实验对聚合物的吸附动力学进行分析,采用平衡结合实验评价了分子印迹聚合物的吸附性能。结果表明,采用表面修饰分子印迹法所制备的印迹聚合物对罗丹明B表现出较好的特异吸附,对模板分子最大吸附量值为96μmol/g。     

原花青素分子印迹聚合物的制备及其吸附性能研究

目的制备原花青素分子印迹聚合物,研究其吸附性能。方法以原花青素为目标分子,甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,偶氮二异丁腈(AIBN)为引发剂合成分子印迹聚合物。研究结果表明吸附溶剂选择水溶液为最佳溶剂,吸附时间在120min时可达吸附平衡,分子印迹聚合物对原花青素分子的吸附性能和非分子印迹聚合物相比增加显著,且具有很高的选择性。结论分子印迹聚合物能选择性地吸附原花青素,结果满意。     

苏丹红分子印迹聚合物的合成及吸附性能研究

以苏丹红为模板分子,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,在乙腈中采用沉淀聚合法制备分子印迹聚合物。研究了模板分子与功能单体的相互作用和最佳比例,探讨了超声波/离心提取工艺对分子印迹聚合物洗脱的影响,对合成的分子印迹聚合物进行静态吸附实验、吸附动力学实验以及Scatchard分析。结果表明,在相同条件下,与非印迹聚合物相比,分子印迹聚合物对苏丹红有良好的吸附性能。     

结晶紫印迹材料的制备及其在鲤鱼样品分析中的应用

以硅胶为基质,结晶紫为模板分子,甲基丙烯酸(MAA)为功能单位,N,N-亚甲基丙烯酰胺(MBA)为交联剂,硅胶为载体,采用表面修饰分子印迹法,制备对结晶紫具有特定亲和选择性的分子印迹聚合物。应用红外光谱对印迹聚合物进行表征,通过静态吸附实验优化实验条件,对聚合物的吸附行为进行分析,采用平衡结合实验评价了分子印迹聚合物的吸附性能。结果表明,采用表面修饰分子印迹法所制备的印迹聚合物对结晶紫表现出较好的特异吸附,对模板分子最大吸附量值为22. 04 mg/g。     

等离子体引发制备亚甲基蓝印迹聚合物及其吸附性能研究

利用辉光放电等离子体代替传统化学引发剂,以亚甲基蓝为模板分子,丙烯酰胺为单体,N,N-亚甲基双丙烯酰胺作交联剂,采用沉淀聚合法制得分子印迹聚合物,用红外光谱和扫描电镜对其进行了表征。吸附实验表明印迹聚合物在20min达到吸附平衡,印迹聚合物对模板分子吸附量随浓度增加而增加,等离子体引发制备的印迹聚合物吸附量大于化学引发剂制得的印迹聚合物。扫描电镜结果表明等离子体引发制得的分子印迹聚合物颗粒粒径小、表面粗燥、孔穴多、比表面积大。采用等离子体引发制得的分子印迹聚合物对模板分子的吸附常数和最大吸附量分别为0.1528 L/mg和33.62 mg/g。     

没食子酸表面分子印迹材料的制备及其吸附性能

以凹凸棒为载体,没食子酸为模板剂,合成表面分子印迹聚合物,考察分子印迹聚合物对没食子酸的的吸附性能。结果表明,表面分子印迹聚合物对没食子酸具有高度选择性,吸附行为更符合多层吸附的Freundlich方程,吸附动力学为准一级动力学。重复使用5次,吸附效果没有明显下降。用此表面分子印迹聚合物从茶叶中提取出没食子酸,与纯品相似度为99.9%。     

孔雀石绿印迹聚合物的合成及在结构类似物去除中的应用

以孔雀石绿为模板分子,丙烯酸和丙烯酰胺为复合功能单体,N,N-亚甲基双丙烯酰胺为交联剂,采用辉光放电电解等离子体引发技术,通过沉淀聚合法制备了孔雀石绿分子印迹聚合物。利用扫描电镜和红外光谱对印迹聚合物进行表征,并对其吸附性能进行了测试。实验结果表明,制备的分子印迹聚合物对孔雀石绿的吸附在60 min时基本达到饱和,吸附过程符合Freunlich模型。分子印迹聚合物对孔雀石绿吸附能力大于空白聚合物。竞争吸附实验表明,孔雀石绿分子印迹聚合物对孔雀石绿及其结构类似物具有很好的吸附能力和选择性,去除率均在70%以上,结晶紫和孔雀石绿的去除率超过了95%。     

磁性甲磺隆分子印迹聚合物的制备及性能研究

以四氧化三铁为内核,在其表面包覆二氧化硅,采用表面印迹技术制备了磁性甲磺隆分子印迹聚合物(MIPs)。采用磁强计(VSM)对产物的磁性进行了表征。研究了溶液pH对印迹聚合物吸附容量的影响。通过动态平衡结合法研究了分子印迹聚合物的吸附能力。结果表明,准二级动力学模型很好地拟合了吸附动力学,相关系数r达到0.999 6,吉布斯自由能变化值为-8.481 kJ/mol。与非分子印迹聚合物相比,制备的MIPs表现出高吸附容量和快速的吸附动力学。特异性吸附实验表明分子印迹聚合物对甲磺隆具有高选择性吸附。     

硫丹分子印迹聚合物的合成及吸附特性分析

采用分子印迹技术,以α-甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,偶氮二异丁腈为引发剂,乙腈为致孔剂,合成以硫丹为模板的印迹聚合物微球。首先利用紫外光谱方法研究了模板与功能单体相互作用情况,采用平衡吸附试验对印迹聚合物吸附效率进行了表征,与化学组成相同的空白聚合物相比,印迹聚合物微球对模板分子具有更高的吸附效率,按最佳合成条件得到的印迹聚合物最大表观吸附量达42.56 mmol/g。     

硅胶表面接枝引发转移终止剂制备牛血红蛋白分子印迹聚合物及性能评价

以牛血红蛋白为模板分子,丙烯酰胺为功能单体,N - N甲基双丙烯酰胺为交联剂,通过固定在硅胶表面的引发转移终止剂二乙基二硫代氨基甲酸钠引发聚合反应,应用表面印迹法制备了牛血红蛋白(BHb)印迹聚合物.通过平衡吸附和选择性实验进行评价,结果表明印迹聚合物具有高吸附效率和选择性.     

Adsorption isotherm of ibuprofen on molecular imprinted polymer

A molecular imprinted polymer (MIP) using (+)-(S)-2-(4-isobutylphenyl) propionic acid ((+)-(S)-ibuprofen) as the template and 4-vinylpyridine (4-VPY) as the functional monomer was prepared. Chloroform and acetonitrile were used as the porogen with ethylene glycol dimethacrylate (EGDMA) as the crosslinker and 2,2′-azobis(isobutyronitrile) (AIBN) as the initiator. Comparison of ibuprofen adsorption isotherm on molecular imprinted and blank polymers was made by the static method. The adsorption equilibrium data were correlated into the Freundlich, Langmuir, Sips (Langmuir-Freundlich) and Radke-Prausnitz isotherm models, respectively. By a nonlinear regression analysis, the experimental parameters in the equilibrium isotherms were estimated and compared. The calculated data is well fitted with the experimented data. Through the analysis, the ibuprofen imprinted polymer showed higher adsorption ability than blank polymer.     

Adsorption isotherms of caffeine on molecular imprinted polymer

A molecular imprinted polymer (MIP) using caffeine as the template and methacrylic acid (MAA) as the functional monomer was prepared. Acetonitrile was used as the porogen with ethylene glycol dimethacrylate (EGDMA) as the crosslinker and 2,2′-azobis(isobutyronitrile) (AIBN) as the initiator. By a linear and nonlinear regression analysis, the experimental parameters in the equilibrium isotherms were estimated. Then, the linear and quadratic equations for concentration and sorbents to adsorption amounts were expressed, and the adsorption equilibrium data were also correlated into the Freundlich isotherm model. Comparisons of caffeine adsorption isotherm on C₁₈ particles as well as the molecular imprinted polymer were made. The results showed that the caffeine-imprinted polymer showed extraordinarily higher adsorption ability than C₁₈ particles.     

Preparation and evaluation of magnetic imprinted polymers for 2,4,6‐trinitrotoluene by surface imprinting

A safe and facile approach for the preparation of magnetic molecularly imprinted polymer nanospheres for 2,4,6‐trinitrotoluene (TNT) recognition is reported. The imprinted nanospheres were synthesized using TNT as the imprinting molecule, acrylamide as the functional monomer, N,N'‐methylenebisacrylamide as the crosslinker and magnetic particles as the support. The structure of the materials was identified via Fourier transform infrared spectroscopy, X‐ray photoelectron spectroscopy and transmission electron microscopy. Static adsorbing experiments were carried out and Scatchard plot analysis showed that two kinds of receptor sites were formed in the imprinted materials. The adsorption equilibrium constant and the maximum adsorption capacity were evaluated. These results indicated that the imprinted nanospheres have higher adsorption capacity and selectivity for TNT than non‐imprinted polymer nanospheres with the same composition. © 2013 Society of Chemical Industry     

异丙酚分子印迹聚合物的制备及其结合特性

采用分子印迹技术制备了异丙酚分子印迹聚合物,并考察其结合特性和选择性。以异丙酚为模板分子,甲基丙烯酸为功能单体,二甲基丙烯酸乙二醇酯为交联剂,偶氮二异丁腈为引发剂,甲苯、正己烷为溶剂合成异丙酚分子印迹聚合物。通过平衡吸附实验,研究了异丙酚分子印迹聚合物的结合特性和选择性。Scatchard模型分析表明,在该聚合物中存在对异丙酚有不同亲和力的两类作用位点。此聚合物与异丙酚的结合要优于麝香草酚。此方法可合成异丙酚分子印迹聚合物,通过结合实验和对底物选择性考察,表明该聚合物对异丙酚具有良好的选择性。     

Adsorption selectivity of phenylalanine imprinted polymer prepared by the Wet Phase Inversion Method

A phenylalanine (Phe) imprinted polymer was prepared by the wet phase inversion method to investigate the optimum preparation condition which endows the polymer matrix with prominent adsorption selectivity. The addition of a large amount of porogen (dimethyl sulfoxide: DMSO) was needed to form macrovoids in the polymer matrix. For the high adsorption selectivity of the polymer matrix, a complex between functional monomers and a template molecule must be formed before the copolymerization of acrylomtnle (AN: crosslinker) and acrylic acid (AA: functional monomer). The formation of a phenyl group in the polymer matrix by the coupling reaction between D-Phe and AA seemed to cause the reverse adsorption selectivity of the polymer matrix. The adsorption selectivity of the Phe imprinted polymer was dependent on the pH of the racemate solution. The adsorption selectivity of the D-Phe imprinted polymer prepared by the post implanting method reached 11 at pH 2 and showed a reverse adsorption selectivity at pH 4 and 6.     

Synthesis and characterization of a surface imprinting silica gel polymer functionalized with phosphonic acid groups for selective adsorption of Fe(III) from aqueous solution

A Fe(III) ion‐imprinted silica gel polymer functionalized with phosphonic acid groups (IIP‐PA/SiO₂) was prepared with surface imprinting technique by using Fe(III) ion as template ion, grafted silica gel as support, and vinylphosphonic acid as functional monomer. The polymer was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, Brunauer–Emmett–Teller, and thermogravimetric analysis. The synthesized imprinted silica gel polymer was used as a sorbent for Fe(III) adsorption. The adsorption properties, such as the effect of solution pH, adsorption kinetic, adsorption isotherm, adsorption selectivity as well as the regeneration of sorbent were studied. The results showd that the prepared sorbent (IIP‐PA/SiO₂) had a short adsorption equilibrium time (12 min) and high adsorption capacity (29.92 mg g^?1) for Fe(III) at the optimal pH of 2.0. The selectivity coefficients of the sorbent for Fe(III) in presence of Cr(III), M_n (II), and Zn(II) were 51.76, 27.86, and 207. 76, respectively. Moreover, the adsorption capacity of the prepared sorbent did not decrease significantly after six repeated use. Thus, the prepared ion‐imprinted silica gel polymer was a promising candidate sorbent for the selective adsorption of Fe(III) from aqueous solutions. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45165.     

山奈酚分子印迹聚合物的制备及其性能表征

采用分子印迹技术,以山奈酚(Kaempferol,KAE)为模板分子,2-乙烯基吡啶(2-Vpy)为功能单体,乙二醇二甲基丙烯酸酯(EDMA)为交联剂,合成了山奈酚分子印迹聚合物(KAE-MIP)。采用静态平衡结合实验评价了KAE-MIP对底物分子的结合特性,并进行了吸附动力学研究。结果表明,KAE-MIP对KAE呈现出了很高的选择吸附特性;Scatchard分析显示KAE-MIP对KAE存在不同亲和力的两类结合位点;与对照物在KAE-MIP上的吸附行为比较表明,KAE-MIP对KAE具有良好的分子识别性能;KAE-MIP对KAE的选择性吸附基本在2 h之内完成。