一种基于有机杂化溶胶-凝胶Hg2+敏感膜的研究

研究了基于有机杂化硅氧烷的Hg2 光化学传感膜,通过四甲氧基硅烷(TMOS)和二甲基二甲氧基硅烷(DMOS)进行缩聚,将5,10,15,20-四苯基卟啉磺酸钠与十六烷基三甲基溴化铵以离子对的形式包埋于溶胶-凝胶中,获得对Hg2 有灵敏荧光响应的溶胶-凝胶敏感膜.实验考察了传感膜的制备条件和响应性能.结果表明,在pH 8.0的Tris-HCl缓冲溶液中,Hg2 的浓度与传感膜的荧光猝灭比值在1.0×10-5～1.0×10-4mol·L-1范围内呈线性关系,传感膜具有响应时间短,指示剂不泄漏,测定重现性好,其他金属离子干扰小等优点.

Research of Hg2+ Sol-Gel Membrane Made of Organically Modified Silicates

A photochemical sensor for the determination of Hg2+ consisting of organically modified silicates (ormosils) was developed. Hg(2+)-sensitive fluorescent sol-gel films were prepared by co-condensation of tetramethoxysilane (TMOS) and dimethyldimethoxysilane (DMOS), and the fluorescent indicator 5,10,15, 20-tetra (p-sulfonatophenyl) porphyrin sodium was embedded in sol-gel in the form of ion pairs with cetyltrimethyl ammonium bromide. The optimization condition of preparation and response performance of sol-gel membrane were investigated. The experimental results showed a linear range of Hg2+ concentrations from 1.0 x 10(-5) to 1.0 x 10(-4) mol x L(-1) in a Tris-HCl buffer at pH 8.0 with fast response and good repetition. The indicators in the sol-gel membrane did not leak out and the sensor showed good selectivity over other metal ions.