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Different Morphological Organic–Inorganic Hybrid Nanomaterials as Fluorescent Chemosensors and Adsorbents for Cu II Ions
Author(s) -
Lee Soo Jin,
Bae Doo Ri,
Han Won Seok,
Lee Shim Sung,
Jung Jong Hwa
Publication year - 2008
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.200701073
Subject(s) - chemistry , adsorption , moiety , metal ions in aqueous solution , mesoporous silica , nanomaterials , acetonitrile , inorganic chemistry , fluorescence , nuclear chemistry , ion , metal , mesoporous material , organic chemistry , catalysis , chemical engineering , physics , quantum mechanics , engineering
Functionalized silica nanotubes (FSNT), functionalized mesoporous silica (FMS), and functionalized silica nanoparticles (FSNP‐15) with an immobilized phenanthroline moiety as a fluorescent receptor were fabricated by a sol–gel reaction, and their binding abilities with metal ions were evaluated by fluorophotometry in water/acetonitrile (8:2, v/v) at pH 7. They selectively recognized Cu 2+ ions among other metal cations such as Co 2+ , Cd 2+ , Hg 2+ , Ni 2+ , Fe 3+ , Ag + , Pb 2+ , and Zn 2+ , because the Cu 2+ ion selectively binds to the nitrogen atoms of the phenanthroline moiety. Among the three silica nanomaterials with the immobilized receptor 1 , the sensitivity of FSNT for Cu 2+ ions is better than those of FMS and FSNP‐15, indicating that the adsorption capacity for metal ions is dependent on the shape and surface area of the supporting nanomaterials. FSNT (10 mg) adsorb 75 % of the Cu 2+ ions (2.0 × 10 –4 m M ) while FSNP‐15 (10 mg) adsorb only 36 %. The detection limit of FSNT for Cu 2+ ions was ca. 3.0 × 10 –8 M . FSNT and FMS can be easily renewed by treatment with a solution of HCl and tetrabutylammonium hydroxide. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)