负载于二氧化硅纳米粒子的菲并咪唑衍生物对Hg2+的检测  

Fluorescent Sensing of Hg 2+by Phenanthroimidazole Derivative Supported on Silica Nanoparticles

作　　者：贾红丹 邢文莉 宋玉姣 郑社洪 高云燕[1] 欧植泽[1] JIA Hongdan;XING Wenli;SONG Yujiao;ZHENG Shehong;GAO Yunyan;OU Zhize(School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi’an 710072,Shaanxi,P.R.China)

机构地区：[1]西北工业大学化学与化工学院,陕西西安710072

出　　处：《影像科学与光化学》2020年第4期601-608,共8页Imaging Science and Photochemistry

基　　金：陕西省自然科学基金(2018JM2019);西北工业大学研究生创意创新种子基金(ZZ2019221,ZZ2019233)资助。

摘　　要：以正硅酸乙酯(TEOS)和二乙氧基二甲基硅烷(DEDMS)为原料,制备了两种不同的二氧化硅纳米粒子SNP1和SNP2。利用透射电镜和动态光散射对二氧化硅纳米粒子进行了表征,结果表明SNP1和SNP2的尺寸分别为13.5 nm和25.9 nm。动态光散射实验测得SNP1和SNP2的Zeta电位分别为-5.74 mV和-2.28 mV。设计合成了Turn-on型荧光探针菲并咪唑衍生物PIP-S,并将其负载于二氧化硅纳米粒子SNP1和SNP2上以改善其水溶性。通过紫外-可见光谱法和荧光光谱法研究了探针PIP-S在水溶液中对汞离子的识别特性,发现PIP-S在有机溶剂DMF中对汞离子的检测限为1.32 nmol·L-1;而负载于SNP1和SNP2后,对水中汞离子的检测限分别为8.37 nmol·L-1和14.75 nmol·L-1。此结果证实负载PIP-S的二氧化硅纳米粒子对汞离子具有良好选择性、高灵敏度和快速响应,且不受其他金属离子的干扰。By using tetraethoxysilane(TEOS)and diethoxydimethylsilane(DEDMS)as starting materials,two silica nanoparticles SNP1 and SNP2 are prepared.SNP1 and SNP2 are characterized using transmission electron microscopy(TEM)and dynamic light scattering(DLS).The average diameters of SNP1 and SNP2 determined from the TEM image are about 13.5 nm and 25.9 nm.Dynamic light scattering(DLS)data show that the Zeta potentials of SNP1 and SNP2 are-5.74 mV and-2.28 mV,respectively.A turn-on fluorescence probe PIP-S based on phenanthroimidazole is designed and synthesized,which can be supported on SNP1 and SNP2 to improve their water solubility.UV-Vis and fluorescence spectroscopy are employed to investigate the specific recognition of Hg 2+by PIP-S.The detection limit(LOD)of PIP-S toward Hg 2+is determined to be 1.32 nmol·L-1 in DMF.The detection limits of PIP-S supported on SNP1 and SNP2 for Hg 2+in aqueous solution are 8.37 nmol·L-1 and 14.75 nmol·L-1,respectively.These results showed that PIP-S supported on SNP1 and SNP2 can detect Hg 2+with good selectivity and high sensitivity,and without the interference of other metal ions.

关 键 词：二氧化硅纳米粒子 汞离子 荧光传感器 菲并咪唑 

分 类 号：X832[环境科学与工程—环境工程] O657.3[理学—分析化学]