Analytical Sciences

Abstract − Analytical Sciences, 32(5), 511 (2016).

SBA-15 Functionalized with Naphthalene Derivative for Selective Optical Sensing of Cr2O72− in Water
Mehdi KARIMI,* Alireza BADIEI,*,** and Ghodsi MOHAMMADI ZIARANI***
*School of Chemistry, College of Science, University of Tehran, Tehran, Iran
**Nanobiomedicine Center of Excellence, Nanoscience and Nanotechnology Research Center, University of Tehran, Tehran 98-21, Iran
***Department of Chemistry, Faculty of Science, Alzahra University, Tehran 98-21, Iran
A novel organic-inorganic hybrid optical sensor (NUS) was designed and prepared in two steps: the grafting of 3-(isocyanatopropyl)trimethoxysilane onto the surface of SBA-15, and then the attachment of naphthalene-1-amine. The obtained materials were characterized using low-angle XRD, N2 adsorption-desorption, TGA, FT-IR, and TEM techniques. A fluorescence study revealed that the NUS was a highly selective optical sensor for the detection of Cr2O72− among various anions, including F, I, Cl, Br, CO32−, HCO3, NO3, H2PO4, CH3COO, and NO2 with a good linearity between the fluorescence intensity and the concentration of Cr2O72− as well as a detection limit of 1.2 × 10−7 M in a 100% aqueous medium. Moreover, the applicability of real samples of the sensor is also discussed.