Hexagonal-prism-shaped optical sensor/captor for the optical recognition and sequestration of PdII ions from urban mines

Mohamed A. Shenashen, Sherif A. El-Safty*, Emad A. Elshehy, Mohamed Khairy

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    45 Citations (Scopus)


    In this work, we have developed a hexagonal-prism-shaped optical sensor/captor (OSC) based on the immobilization of an organic probe into hexagonal, micrometric monoliths of mesoporous aluminosilica scaffolds for the colorimetric monitoring, selective sequestering, and effective recovery of PdII ions from urban mines as a promising technology for industrial applications. In such a solid OSC, H-type aggregation and face-to-face (π-π∗ stacking) interactions between the heteroatoms-coordinated organic probe and the active acid sites of the scaffolds lead to the formation of 1D molecular probe assemblies parallel to the interior pore walls. The design patterns of hexagonal-prism-shaped and open cylindrical pores (ca. 4 nm) exhibited suitable accommodation to protect the organic probe from extra H-aggregates, as evidenced by the high affinity of the PdII-probe binding events. The OSC shows evidence of controlled PdII ion assessment in terms of the optical recognition of PdII ions down to sub-nanomolar concentrations (3.3 × 10-9 mol/L). Our study shows that the developed OSC can be used as an effective tool for urban mining development, particularly for secondary resources in industrial countries.

    Original languageEnglish
    Pages (from-to)179-191
    Number of pages13
    JournalEuropean Journal of Inorganic Chemistry
    Issue number1
    Publication statusPublished - 2015


    • Optical recognition
    • Organic-inorganic hybrid composites
    • Palladium
    • Sensors
    • Urban mines

    ASJC Scopus subject areas

    • Inorganic Chemistry


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