Ag/SiO_2/Chitosan复合纳米粒子的合成及对六价铬吸附的分析应用  

Synthesis of Ag/SiO_2/Chitosan Nanocomposites and Its Analytical Application for Adsorbing Chromium(Ⅵ)

作　　者：张艳[1] 郑行望[1] 

机构地区：[1]陕西师范大学化学化工学院陕西省生命分析化学重点实验室,西安710062

出　　处：《高等学校化学学报》2012年第3期481-485,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20575040);国家文物局项目(批准号:20090106);中央高校项目(批准号:GK201001007)资助

摘　　要：基于反相微乳液纳米粒子合成方法制备了Ag/SiO2/Chitosan(壳聚糖)复合纳米粒子.采用透射电子显微镜、电化学方法和紫外-可见吸收光谱表征了复合纳米粒子的性质.结果表明,该复合纳米粒子具有导电性、阴离子通道效应和对六价铬的吸附效应.与修饰电极化学发光方法相结合,建立了一种测定六价铬的新方法.在最佳实验条件下,增敏电化学发光信号强度与六价铬的浓度在2.0×10-12～1.0×10-10g/mL范围内呈线性关系,对六价铬的检出限为2×10-13g/mL.The Ag/SiO2/Chitosan nanocomposites were synthesized by the reverse microemulsion method and characterized by TEM,CV（cyclic voltammetry） and UV-Vis spectroscopy.The results show that the nanocomposites present better electrical conductivity,anion channel effect and adsorption effect for chromium（Ⅵ）.Based on these findings as well as the use of chemically modified electrode technique,a sensitive and selective electrochemiluminescence method for chromium（Ⅵ） was developed.Under the optimal experimental conditions,the enhancing ECL（electrochemiluminescence） intensity was linear with the concentration of chromium（Ⅵ） in the range of 2.0×10-12—1.0×10-10 g/mL.The detection limit for chromium（Ⅵ） was 2×10-13 g/mL.

关 键 词：复合纳米粒子 六价铬测定 电化学发光 鲁米诺 

分 类 号：O657.1[理学—分析化学]