3-(巯丙基)三甲氧基硅烷论文：硅胶微球表面镉离子印迹巯基合物的制备与性能

1、3-（巯丙基）三甲氧基硅烷论文： 硅胶微球表面镉离子印迹巯 基合物的制备与性能【中文摘要】离子印迹技术 （Ion Imprinted Technique, IIT） 是以特定离子为模板 , 制备出对目标离子具有专一识别性能的聚合物 技术, 在分离提纯、免疫检测、生物模拟和痕量分析领域展现出广阔 的应用前景。在痕量和超痕量分析中采用离子印迹聚合物技术 , 使得 化学分离和预富集技术获得重大突破。 本文依据在硅胶微球表面修饰 的分子印迹技术的基本思路 , 提出了一种基于硅胶表面修饰的制备离 子印迹聚合物的方法 , 采用接枝方法 , 先将 3-（ 巯丙基 ） 三甲氧基硅烷 （MPS 大分子偶合接枝到

2、硅胶微粒表面，然后以镉离子为模板离子，以 环氧氯丙烷为交联剂 , 通过配位键作用 , 制备了复合型离子印迹材料IIP-MPS/SQ2 考察了反应温度、反应时间和交联剂的种类等因素对 产物的影响，确定了优化的合成条件。通过不同温度、时间和 pH 条件 下，IP-MPS/SQ2 对 Cd2 啲吸附能力研究，表明在不同温度下（30 60C）,IP-MPS/SQ2 都具有非常高的吸附效率。同时IP-MPS/SQ2 在 pH 为 48 的条件下，吸附效果较好。吸附速率也非常快，20 min 就基本可以达到吸附平衡。所以在不同水体条件下，IP-MPS/SQ2 都能较好的选择性去除其中的 Cd2+采用静态法

3、研究了IP-MPS/SQ2 对 Cd2啲结合特性，结果表明,Cd2+印迹材料IP-MPS/SQ2 对 Cd2+具 有强的记忆识别能力，主要表现在两个方面（1） 对 Cd2 的结合量大， IP-MPS/SQ2对 Cd2 啲吸附容量比印迹前复合材料IP-MPS/SQ2 提高 了 2 倍多；2）对 Cd2 啲选择性较好，相对于 Ni2+、 Zn2+、 Cu2+和 C02+,IIP-MPS/SQ2对 Cd2 啲相对选择性系数分别为 26.39、23.28、1.44 和 32.16。另外印迹材料IP-MPS/SQ2 具有优良的洗脱和再生性能。【英文摘要】Ion imprinting technique

4、(IT) is becoming increasinglyrecognized as a powerful technique of preparing synthetic polymers thatcontain tailor-made recognition sides for certain Ions. It has an extensiveapplication in separation and purification, immunoassay, enrichment,biomimics and other relevant fields for its predeterminat

5、ion specificity andpracticability of ion recognition. The introduction of ion-imprinted polymers(IP) in trace and ultratrace analysis provides vital breakthroughs inpre-concentration or separation chemistry.In this paper, a surfacemolecular imprinting technique on the surface of micro-bead silica ge

6、lparticles was put forward, using grafting: firstly functional MPSwas graftedon the silica gel particle surfaces via coupling grafting method; secondlyion imprinting was preformed using heavy-metal ion, Cd2+, as thetemplate, which has been coordinated with MPS, and epichlorohydrin(ECH) as crosslinki

7、ng agent; finally ion-imprinted composite materialIIP-MPS/SiO2 was formed. The optimum processing conditions wereinvestigated with reaction temperature, reaction time,the type of crosslinking agent and other factors to serve as targets.Effectsof temperatures, times and pH conditions on adsorption ca

8、pacity ofIIP-MPS/SiO2 toward Cd2+ were studied. The results demonstrated thattemperature had little effect on adsorption capacity and that very highadsorption efficiency was obta ined at differe nt temperatures (30-60C). The bestadsorption of IIP-MPS/SiO2 was observed whenpHwas in the range of4-8. T

9、he adsorption rate was rather fast and adsorption equilibrium wasformed within 20 min. Therefore, IIP-MPS/SiO2 could selectively removeCd2+ in different water bodies.Thebinding characteristics of II P-MPS/SQ2 for Cd2+ were studied in detail byadopting static methods. The experimental results showed

10、that theion-imprinting material IIP-MPS/SiO2 has specific recognition ability forthe template ions, and this character displays mainly in two aspects:(1) ithas high affinity for the template ions, its binding amounts for the templateions are much greater than that of the non-imprinted composite materialMPS/SiO2 and the absorption capacity enhances more than two timescompared to MPS/SiO2; (2) it has