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+.
Acknowledgements
The authors wish to thank the research council of the University of Tehran for the financial support received.
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