固载型光化学传感器的形貌及结构对检测Hg^(2＋)性能的影响

Effect of Morphology and Channel Structure of Chemosensor on Its Detection Ability for Hg^(2+)

采用氨丙基三乙氧基硅烷(APTES)、异氰酸酯基三乙氧基硅烷(Tri)及纳米金颗粒作为连接体,纯硅中孔分子筛HMS作为无机载体,以分子改造后的染料罗丹明B(RhB)作为有机分子,制得3种固载型光化学传感器,用于检测水中的Hg2+.采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、N2物理吸附和傅里叶变换红外光谱(FTIR)对材料进行表征,并利用荧光光谱检测水溶液中的Hg2+.结果表明,3种连接体均成功地将有机分子RhB固载到HMS上,所制备的固载型光化学传感器均能够检测水溶液中的Hg2+.研究发现,固载后样品的表面形貌及孔道结构对其检测能力产生影响,具有完好表面形貌及孔道结构的样品RhB-Au-HMS对于Hg2+的检测能力最强,内部孔道坍塌的样品RhB-APTES-HMS对于Hg2+的检测能力最弱.

Three Hg^2＋ chemosensors were prepared by immobilizing a Rhodamine B（RhB） derivative on hexagonal mesoporous silica（HMS） via 3-aminopropyl-triethoxysilane（APTES）,3-（triethoxysilyl）propylisocyanate（Tri） and gold nanoparticles,respectively.The prepared chemosensors were characterized by scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,N2 physical adsorption-desorption and Fourier transform infrared spectroscopy（FTIR）.Further fluorescence spectra of chemosensors in sensing Hg^2＋ was detected.The results show that the immobilization process of Rhodamine B（RhB） is very successful and all of the chemosensors have Hg^2＋ detection ability.Moreover,the morphology and channel structure of the chemosensors have effects on the detection ability,that is,RhB-Au-HMS with intact morphology and wormlike channel structure has the most powerful detection ability and RhB-APTES-HMS with the collapsed channel structure has the weakest detection ability.