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Fluorescence-enhanced optical sensor for detection of Al3+ in water based on functionalised nanoporous silica type SBA-15

Mehdi Karimi, Alireza Badieia, and Ghodsi Mohammadi Ziarani

School of Chemistry, College of Science, University of Tehran, 14155-6455 Tehran, Iran



Abstract: An organic–inorganic hybrid optical sensor (PQ-SBA-15) was designed and prepared through functionalisation of the SBA-15 surface with 3-piperazinepropyltriethoxysilane followed by covalently attaching 8-hydroxyquinoline. Characterisation techniques, including FT-IR, thermal gravimetric, N2 adsorption-desorption and X-ray powder diffraction analyses, showed that the organic moieties were successfully grafted onto the surface of SBA-15 without the SBA-15 structure collapsing. The evaluation of the sensing ability of PQ-SBA-15 using fluorescence spectroscopy revealed that the PQ-SBA-15 was a selective fluorescence enhancement-based optical sensor for Al3+ in water in the presence of a wide range of metal cations including Na+, Mg2+, K+, Ca2+, Cr3+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+ and Pb2+ with a limit of detection of 8.8 × 10−7 M. In addition, good linearity was observed between the fluorescence intensity and the concentration of Al3+.

Keywords: fluorescence – nanoporous silica material – SBA-15 – optical sensor – Al3+

Full paper is available at

DOI: 10.1515/chempap-2016-0079


Chemical Papers 70 (11) 1431–1438 (2016)

Tuesday, May 21, 2024

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