Synthesized Ag Nanoparticles in “Green” Method and Their Effects on Metal-Enhanced Room Temperature

本论文共分为以下四个部分：第一部分是绪论部分。首先介绍了银纳米粒子的性质、制备方法及其用途；详细综述了绿色方法在纳米材料制备中的应用；随后介绍了环糊精(CDs)的结构、性质及其在金属纳米材料制备中应用；综述了银纳米粒子应用于增强发光方面的国内外研究进展，并着重介绍了近年来金属增强磷光的研究现状。最后在上述讨论的基础上提出了本论文的设想及研究内容。第二部分是银纳米粒子的绿色制备及其表征。采用葡萄糖还原银氨溶液，以β-CD作保护剂，在加热的条件下制备银纳米粒子。考察了反应物配比、β-CD用量、银氨溶液初始浓度、反应温度对制备纳米银粉的影响。并得到此方法制备银纳米粒子的最优条件为：初始银氨溶液浓度为...The dissertation comprises of four chapters. The first chapter of the dissertation is the preface. First of all, the properties, methods of preparation and application of Ag nanoparticles were generally reviewed. The progresses on the preparation of nanomaterial in green methods were introduced in details. The structure, properties and its application of cyclodextrins (CDs), especially β-cyclodext...学位：理学硕士院系专业：化学化工学院化学系_无机化学学号：1912005130180

Synthesis of Ag Nanoparticles via Green Chemistry Method and Their Enhancing Effects on Room Temperature Phosphorescence of Fluorescein

以β-环糊精(β-CD)作为稳定剂,葡萄糖为还原剂,银氨溶液为前驱体,实现了绿色化学方法合成银纳米粒子.利用紫外-可见分光光度法(UV-Vis)、高分辨透射电镜(HRTEM)、红外光谱法(FTIR)对产物进行了表征.将银纳米粒子引入滤纸表面增强室温磷光(RTP)的研究,发现银纳米粒子对醋酸铅诱导荧光素(FL)所得的RTP具有明显的增强效应,并且随着银纳米粒子加入量的增加具有先增强后猝灭的趋势.对β-CD与银纳米粒子的相互作用机理及银纳米粒子对FLRTP增强效应的作用机理进行了初步讨论.Silver nanoparticles were synthesized via a "green chemistry method",in which [Ag(NH3)2]+ was reduced by β-D-glucose in the presence of β-cyclodextrin(β-CD),and characterized by UV-Vis,HRTEM and FTIR.Enhanced room temperature phosphorescence(RTP)signal of fluorescein on the filter paper surface in the presence of silver nanoparticle was firstly observed.Furthermore,with the increment of Ag nanoparticles' concentration,the RTP intensity of fluorescein was increased at first,and then decreased when the molar ratio of fluorescein to Ag nanoparticles reached 1∶2.The mechanism of the interaction between Ag nanoparticles and β-CD was proposed,and the enhancing effects of Ag nanoparticles on room temperature phosphorescence of fluorescein were discussed.国家自然科学基金(批准号:20777062)资

Quenching Effect of Silver Nanoparticles on Fluorescence of Norfloxacin

以β-环糊精(β-Cd)为稳定剂,葡萄糖为还原剂,采用“绿色化学方法“合成了平均粒径约为31nM的类球形银纳米粒子。研究了其对水溶液中痕量诺氟沙星荧光行为的影响,实验结果表明,制得的银纳米粒子对诺氟沙星具有较强的荧光猝灭效应,且随着加入银纳米粒子量的增加荧光猝灭效果逐渐增强。初步探讨了银纳米粒子对诺氟沙星的荧光猝灭机理。The silver nanoparticles were synthesized by a "green chemistry method",with theβ-cyclodextrin(β-CD) as the stabilizer and glucose as the reducing agent.The silver nanoparticles were spherical shape,and the average grain diameter was about 31nm.The effect of silver nanoparticles on the fluorescence behavior of trace norfloxacin in the water solution was studied,and the silver nanoparticles had strong quenching effect on the fluorescence of norfloxacin.And the quenching effect of norfloxacin became stronger with the increase of the silver nanoparticles amount.The possible quenching mechanism of the silver nanoparticles on the fluorescence of norfloxacin was discussed.国家自然科学基金(21077079);浙江省教育厅科研项目(Y201016867);温州医学院科研发展基金项目(QTJ09009;QTJ09004

Synthesis of Ag nanoparticles via green chemistry method and their enhancing effects on room temperature phosphorescence of fluorescein

Silver nanoparticles were synthesized via a "green chemistry method", in which [Ag (NH3)(2)](+) was reduced by beta-D-glucose in the presence of beta-cyclodextrin (O-CD), and characterized by UV-Vis, HRTEM and FTIR. Enhanced room temperature phosphorescence (RTP) signal of fluorescein on the filter paper surface in the presence of silver nanoparticle was firstly observed. Furthermore, with the increment of Ag nanoparticles' concentration, the RTP intensity of fluorescein was increased at first, and then decreased when the molar ratio of fluorescein to Ag nanoparticles reached 1:2. The mechanism of the interaction between Ag nanoparticles and P-CD was proposed, and the enhancing effects of Ag nanoparticles on room temperature phosphorescence of fluorescein were discussed

THE INTERACTION BETWEEN HUMIC ACID AND PYRENE IN THE PRESENCE OF HEAVY METAL IONS

[中文文摘]建立并验证了腐植酸(HA)和芘结合常数(Koc)测定的荧光猝灭法,进而研究了重金属离子对HA和芘相互作用的影响,测定了重金属离子存在下HA和芘之间的Koc.结果表明:纯化后的HA是分子质量较小的部分,水溶性较高,具有羟基、羧基和碳氧键等极性基团;HA利用其分子中的羟基、羧基、碳氧键等基团和重金属离子产生络合作用,这种络合作用影响了HA的结构;随着重金属离子浓度的增大,Koc遵循先增大,再减小,最后趋于不变的趋势.[英文摘要]The fluorescence quenching method for study on the interaction between humic acid(HA) and pyrene was developed and validated.The complexation between HA and Cu~(2+),Fe~(2+)and Ni~(2+)were studied by Infrared spectroscopy.The effects of heavy metal ions on the interaction between HA and pyrene were investigated by the established method.The results showed that the humic acid was the lighter part of the whole molecule and had high aqueous solubility after purified.The binding sites of HA and heavy metal.国家自然科学基金(20577037)资助项

Study on the Interaction Between Humic Acid and Pyrene by Polarity Probe

[中文摘要]芘(Pyrene,Py)的荧光发射光谱的第一振动带和第三振动带强度比值(I1/I3)能够反映其所处微环境的极性,因此运用Py荧光探针法考察了不同化学条件对腐植酸(Humic Acid,HA)假胶束体系微环境性质的影响,以及对HA和Py之间相互作用的影响.结果表明:HA浓度、pH值、盐度、溶剂等化学条件的改变,均会引起Py的I1/I3的变化,因为条件的变化使HA存在形态发生变化,从而导致Py所处为环境极性的变化.另外,重金属离子浓度的变化也可以影响HA和Py之间相互作用的影响,随着重金属离子浓度的增大I1/I3值遵循三段式变化趋势.这些现象均表明HA和PAHs之间的作用以非极性相互作用为主.[英文摘要]In the fluorescence spectra of Pyrene(Py),the ratio of fluorescence emission intensitise corresponding to the first and third peaks(I_1/I_3) was depended on the polarity of the microenvironment where Py located.The effects of the different chemical conditions on the microenvironment of Humic acid(HA) and the interactions between HA and Py were investigated by polarity probe method.The variation of the I_1/I_3 value of Py was studied in the different pH values,as well as in the different concentrations of HA，,sodium chloride and heavy metal ions. The result s showed that the changes of chemical condition resulted in the variations of the I1 / I3 value of Py. Those set s of effect s were explained in terms of conformational adjustment s of HA. Furthermore ,different types of heavy metal ions had different effects on the interactions between HA and the PAHs. To describe the complicated effect s of heavy metal ions ,we use the three2stage variation model that encompasses decreasing and increasing trends and plateaus. The mechanisms were explained in the variation of HA st ructure configuration , HA aggregation and the salting2out effect . All of the results proved that the interactions between HA and Pyrene Py were nonpolar.国家自然科学基金(20577037)资

Advance in Analytical Methods of Marine Chemistry in China

[中文文摘]概括了近10年来中国海洋化学分析方法研究进展,涉及新技术、新方法在营养盐测定,CO2系统参数分析,痕量有机物分析,化学示踪及同位素分析等方面的应用,并提出了一些不足.本文引用文献56篇,以期为我国海洋化学分析方法的进一步研究和应用提供参考.[英文文摘]Advance in the analytical methods of marine chemistry in the last decade in China was reviewed including the development of modern analytical methods for nutrients,carbon dioxide in seawater,trace organic materials,chemical tracer and isotopes.Some deficiency in this field was proposed.56 references in the field were cited and some prospects were delivered.国家自然科学基金“厦门大学化学基地(J0630429)”; 国家自然科学基金(20577037)资助