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Hexagonal‐Prism‐Shaped Optical Sensor/Captor for the Optical Recognition and Sequestration of Pd II Ions from Urban Mines
Author(s) -
Shenashen Mohamed A.,
ElSafty Sherif A.,
Elshehy Emad A.,
Khairy Mohamed
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201402756
Subject(s) - chemistry , stacking , prism , hexagonal prism , ion , mesoporous silica , heteroatom , mesoporous material , triangular prism , hexagonal crystal system , nanotechnology , crystallography , catalysis , organic chemistry , materials science , ring (chemistry) , optics , physics
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 Pd II 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 Pd II –probe binding events. The OSC shows evidence of controlled Pd II ion assessment in terms of the optical recognition of Pd II 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.