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二西基锡分子印迹聚合物的合成与性能研究 总被引:1,自引:0,他引:1
以壳聚糖(CTS)为基体, 二丁基锡(DBT)为模板, 采用分子印迹技术制备了在空间结构和结合位点上与DBT匹配的分子印迹聚合物(DBT-MIPs). 研究了该分子印迹聚合物的合成条件、对DBT的吸附性能和选择识别能力, 并对其结构进行了表征. 结果表明, 所合成的DBT-MIPs对DBT具有良好的吸附和选择识别能力, 最大吸附量为178.6 μg/g. 相似文献
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以5-(4-羟基苯基)-10,15,20-三苯基卟啉锌为印迹分子,4-乙烯基吡啶为功能单体,乙二醇二甲基丙烯酸酯为交联剂,合成了具有金属卟啉识别能力的分子印迹聚合物.紫外可见滴定光谱研究表明,功能单体与印迹分子在聚合前形成1:1的配合物.通过吸附试验、荧光光谱及斯卡查特分析法,考察了分子印迹聚合物对锌卟啉化合物的识别性能.结果表明,印迹聚合物对结构类似的卟啉化合物具有良好的识别能力,对印迹分子荧光性能的影响远大于其对应的非印迹聚合物.在浓度较低时,印迹聚合物对印迹分子的结合常数和最大结合量分别为:1.61×106L/mol和3.22×10-5mol/g. 相似文献
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基于金属卟啉的分子印迹聚合物的合成及其对三唑类杀菌剂识别性能研究 总被引:1,自引:1,他引:0
以三唑类杀菌剂氟环唑为印迹分子,5-(4-甲基丙烯酰氧苯基)-10,15,20-三苯基卟啉锌为功能单体,乙二醇二甲基丙烯酸酯为交联剂,合成了新型的基于金属卟啉的分子印迹聚合物.紫外-可见光谱研究表明印迹分子与功能单体在聚合前形成1∶1配合物.通过选择性吸附和固相萃取表征研究了该印迹聚合物对氟环唑及具有类似化学结构的三唑类杀菌剂的识别能力,并与非印迹聚合物进行了比较,结果表明印迹聚合物具有良好的特异性识别性能,同时,印迹聚合物的交联度及吸附溶剂的极性对印迹效果有着显著影响. 相似文献
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利用离子印迹技术以铅离子为模板,甲基丙烯酸为功能单体,偶氮二异丁腈为引发剂,乙二醇二甲基丙烯酸酯为交联剂,采用本体聚合法制备铅离子印迹聚合物。通过红外光谱和紫外光谱对该离子印迹聚合物进行表征,采用静态平衡吸附实验分析铅离子印迹聚合物的吸附性能和吸附选择性。实验结果表明:与非印迹聚合物相比较,Pb(II)印迹聚合物对Pb(II)具有较强的吸附能力和较好的吸附选择性,饱和吸附量为19.44mg/g,pH=6时吸附效果最好,达到吸附平衡的时间是7h;静态分配系数Kd和选择性系数k分别为1381ml/g和20.3。将该离子印迹聚合物应用于环境水样中铅离子测定时的预富集,结果满意。 相似文献
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以非诺贝特(FNB)为模板分子,α-甲基丙烯酸(MAA)为功能单体,乙二醇二甲基丙烯酸酯(EDMA)为交联剂,采用本体聚合方法合成了FNB分子印迹聚合物(MIP)。IR和SEM表征的结果显示:FNB分子印迹聚合物中存在与模板分子相互作用的特征基团,与空白聚合物(NIP)的表面形态显著不同,说明MIP存在与模板分子相互识别的结合位点。采用静态平衡结合方法和Scatchard模型评价了FNB分子印迹聚合物的结合特性和识别机理,并考察了其选择性吸附能力。结果表明,FNB分子印迹聚合物存在能量相异的两类特异性结合位点,对FNB具有高选择吸附特性,饱和吸附量为6.363mg/g。 相似文献
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采用表面印迹技术, 以Co(Ⅱ)离子作为印迹离子, 二乙烯三胺基丙基三甲氧基硅烷为功能分子, 硅胶为支撑物, 环氧氯丙烷为交联剂, 在硅胶表面制备Co(Ⅱ)离子印迹硅胶材料, 利用红外光谱仪、扫描电镜和热重分析仪等进行了表征, 采用平衡吸附法研究了印迹硅胶材料的吸附性能和选择识别能力. 结果表明, 印迹硅胶材料和非印迹硅胶材料的最大吸附量分别为35.2和6.5 mg/g; 印迹硅胶材料对Co(Ⅱ)离子的吸附行为符合Langmuir模型; 20 min即可达到吸附平衡; 当pH=3.9~7.8时, 印迹硅胶材料保持了较好的吸附容量; 印迹硅胶材料对Co(Ⅱ)离子具有较强的选择性识别能力; 重复使用时性能稳定. 相似文献
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以铜离子为模板的褐藻酸凝胶对铜离子的选择性富集研究 总被引:2,自引:0,他引:2
以铜离子为模板,制备了褐藻酸凝胶(Cu-alginate),通过吸附实验及过柱渗滤实验,试验了该吸附剂对铜离子的选择性吸附性能,并且采用该吸附剂富集了自来水中微量的Cu^2 ,结合原子吸收法测定了水样中Cu^2 的含量。结果表明:该吸附剂对Cu^2 有较高的选择性吸附性能,显著优于一些化学合成铜离子模板缩聚物及非铜模板褐藻酸凝胶(如Ca-alginate),非重金属离子(如K^ 、Na^ 、Ca^2 )及某些重金属离子(如Ni^2 、Cd^2 )等对Cu^2 的吸附均不产生明显干扰。用该吸附剂富集水中的微量铜离子,回收率可达97.7%。 相似文献
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通过在[Bmim]PF6离子液体-水双相体系中,以对苯二酚为模板分子,甲基丙烯酸为功能单体,二甲基丙烯酸乙二醇脂为交联剂,采用悬浮聚合法制备得到对苯二酚印迹聚合物微球(MIMs-IL),并通过FTIR等测试技术对MIMs-IL进行了表征。对不同离子液体进行了选择,[Bmim]PF6介质中制备的MIMs-IL的识别性能最好。与从氯仿介质中制备的印迹聚合物微球(MIMs-Or)相比较,MIMs-IL的产率为70.8%,明显高于MIMs-Or的48.7%。采用静态吸附法考察其印迹识别能力的结果表明,MIMs-IL对水中的对苯二酚的识别能力大大强于MIMs-Or。对MIMs-IL识别吸附的热力学和动力学研究结果表明,12h时MIMs-IL及其非印迹聚合物微球(nMIMs-IL)均达到各自饱和吸附量,对于0.50g/L对苯二酚水溶液,MIMs-IL的饱和吸附量是nMIMs-IL的2.67倍。 相似文献
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《Journal of separation science》2018,41(17):3459-3466
In this study, a highly sensitive and selective sample pretreatment procedure using molecularly imprinted silica nanoparticles was developed for the extraction and determination of quercetin in red wine samples coupled with high‐performance liquid chromatography with ultraviolet detection. The imprinted silica nanoparticles were prepared in the presence of N‐acryoyl‐l ‐aspartic acid (functional monomer), quercetin (template), azobisisobutyronitrile (initiator) and methylene bisacrylamide (cross‐linker) and methanol/water (porogen) via surface‐initiated reversible addition‐fragmentation chain transfer polymerization. Surface characterization was performed and several imprinting parameters were investigated, and the results indicated that adsorption of quercetin on the imprinted silica nanoparticles followed a pseudo‐first‐order adsorption isotherm with a maximum adsorption capacity at 26.4 mg/g within 60 min. The imprinted silica nanoparticles also showed satisfactory selectivity towards quercetin as compared with its structural analogues. Moreover, the imprinted nanoparticles preserved their recognition ability even after five adsorption–desorption cycles. Meanwhile, the nanoparticles were successfully applied to selective extraction of quercetin from red wine with a high recovery (99.7–100.4%). The limit of detection was calculated to be 0.058 μg/mL with a correlation coefficient 0.9996 in the range of 0.2–50 μg/mL. As a result, the developed selective extraction method using molecular imprinting technology simplifies the sample pretreatment procedure before determination of quercetin in real samples. 相似文献
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《Journal of separation science》2018,41(15):3060-3068
Thermo‐responsive magnetic molecularly imprinted polymers were prepared by simple surface molecular imprinting polymerization for the selective adsorption and enrichment of formononetin from Trifolium pretense by temperature regulation. Using formononetin as a template, N‐isopropylacrylamide as the thermo‐responsive functional monomer, and methacrylic acid as an assisting functional monomer, the polymers were synthesized on the surface of the magnetic substrate. The results show that imprinted polymers attained controlled adsorption of formononetin in response to the temperature change, with large adsorption capacity (16.43 mg/g), fast kinetics (60 min) and good selectivity at 35°C compared with that at 25 and 45°C. The selectivity experiment indicated that the materials had excellent recognition ability for formononetin and the selectivity factors were between 1.32 and 2.98 towards genistein and daidzein. The excellent linearity was attained in the range of 5–100 μg/mL, with low detection limits and low quantitation limits of 0.017 and 0.063 μg/mL, respectively. Furthermore, the thermo‐responsive magnetic molecularly imprinted polymers were successfully utilized for enriching and purifying formononetin from Trifolium pretense. The analytical results indicate that the imprinted polymers are promising materials for selective identification and enrichment of formononetin in complicated herbal medicines by simple temperature‐responsive regulation. 相似文献
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Molecularly imprinted polymer (MIP) will be modified on the surface of the core-shell structure silica magnetic nanoparticles, during which quercetin is used as a template molecule, acrylamide as a functional monomer, azo-bisisobutyronitrile as an initiator and ethylene glycol dimethacrylate as a cross-linker, to synthesize highly efficient and selective quercetin magnetic molecularly imprinted nanoparticles via Reversible Addition-Fragmentation chain Transfer (RAFT) polymerization. FT-IR and X-ray diffraction (XRD) patterns are used to monitor the reaction and show the characteristic groups of each reaction step. Compared with the conventional bulk polymerization (2.7029 mg/g), the adsorption test showed that the MMIP by RAFT activity controlled polymerization had better absorption capacity for quercetin which the saturated adsorption amount was 4.8471 mg/g. Kinetic studies indicate that pseudo first order model is suitable to describe the adsorption mechanism. Thermodynamics experiment revealed that Langmuir model was more applied for explains the adsorption of quercetin onto magnetic molecularly imprinted polymer. 相似文献
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结合分子印迹技术,MOF199为基体,以二苯并噻吩(DBT)为模板分子,甲基丙烯酸(MAA)为功能单体,制备了新型表面分子印迹聚合物材料MOF@SMIP。采用SEM、BET、FT-IR等对其结构和形貌进行表征,在模拟油样中进行吸附评测,吸附平衡时间为1.5 h。MOF@SMIP对DBT吸附量为130.73 mg/g较MOF199吸附量37.79 mg/g有很大提升,同时MOF@SMIP吸附量对比MOF@NIP吸附量(57.13 mg/g)优势明显,印记因子f_(imp)为2.29。吸附行为遵循伪一阶动力学模型说明吸附主要为物理过程。选择性吸附实验表明,MOF@SMIP对目标分子DBT表现出比对结构类似物苯并噻吩(BT)和联苯更高的亲和力,吸附DBT对干扰物BT和联苯的相对选择系数k'分别达到2.55和2.14。 相似文献
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以甲醛为模板分子,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,用氯仿做溶剂,制备了甲醛分子印迹聚合物,并优化了此制备方法,在模板分子、功能单体和交联剂的摩尔比为1:2:20,预聚合时间为4 h,聚合时间为8 h的条件下制备的聚合物对甲醛的特异性吸附能力最好,当甲醛溶液的浓度为2 mmol/L时聚合物对甲醛的吸附量达到了12.40×10-2 mmol/g。 对市售鱿鱼处理后用高效液相色谱法测定得样品中甲醛的浓度是5.92 mg/Kg,将该样稀释100倍以后甲醛已无法检出,经MIP柱富集后检测计算样品中甲醛浓度为5.76 mg/Kg,表明该聚合物用于样品前处理高效且结果无显著性差异。 相似文献