N-propylaniline functionalized 2D-hexagonal mesoporous silica as a highly selective fluorescence sensor for the detection of Hg(II) in water

作者：Gomes Ruth; Bhaumik Asim^*

来源：Microporous and Mesoporous Materials, 2015, 207: 71-77.

DOI：10.1016/j.micromeso.2014.12.030

• N-proplyaniline functionalization
• Mesoporous material
• Fluorescence sensor
• Selective mercury detection
• Photoluminescence

N-propylaniline functionalized 2D-hexagonal mesoporous SBA-15 material MFMS (monolayer N-propylaniline functionalized mesoporous SBA-15 type material) has been synthesized, where N-propylaniline group covalently grafted at the mesopore surface acts as a chromophoric fraction of the material for the sensing of metal ions from solutions. Powder XRD, HR TEM, FT IR, TGA, C-13/Si-29 solid state MAS-NMR, N-2 sorption tools are employed to characterize the mesophase, framework-bonding and the surface properties of the material. Photoluminescence spectroscopy has been used to investigate the sensing behavior of this material towards various metal ions. This functionalized mesoporous material showed very high selectivity for sensing Hg2+ ions from its aqueous solution. With increasing concentration of Hg2+ ions from nanomolar to micromolar strength, strong fluorescence quenching is observed (upto 95.04%), while other main group and transition metal ions (Na+, K+, Ca2+, Mg2+, Cr3+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+) caused insignificant change in the fluorescent intensity of the material, suggesting future potential of MFMS as a highly selective Hg(II)-sensor.

• 出版日期2015-5-1