A single hybrid optical sensor based on nanoporous silica type SBA-15 for detection of Pb2+and I−in aqueous media

Abstract

Simple two-steps post synthesis procedure achieved the functionalized nanoporous SBA-15 as a single hybrid optical sensor for detecting Pb ²⁺and I ⁻ions in aqueous media.

Abstract

A novel organic–inorganic hybrid optical sensor (HQS-SBA-15) was prepared by a two-step post synthesis of SBA-15: functionalization with 3-(iodopropyl)-trimethoxysilane followed by the covalent attachment of 8-hydroxyquinoline-5-sulfonic acid. XRD, N ₂adsorption–desorption, TEM and FT-IR were used for the characterization of the prepared materials. A fluorescence study showed that the suspension of HQS-SBA-15 in water was able to detect selectively and sensitively two ions with opposite charges, i.e.Pb ²⁺in the presence of different cations, including Na ⁺, Mg ²⁺, Al ³⁺, K ⁺, Ca ²⁺, Mn ²⁺, Co ²⁺, Cu ²⁺, Zn ²⁺, Cd ²⁺and Hg ⁺, as well as I ⁻among different anions, including NO ₂ ⁻, NO ₃ ⁻, CN ⁻, Cl ⁻, F ⁻, Br ⁻, CO ₃ ²⁻, SO ₄ ²⁻, HCO ₃ ⁻, and H ₂PO ₄ ⁻. The effects of pH, its applicability in real samples and reversibility are also discussed.