Different Morphological Organic–Inorganic Hybrid Nanomaterials as Fluorescent Chemosensors and Adsorbents for CuII Ions

✍ Scribed by Soo Jin Lee; Doo Ri Bae; Won Seok Han; Shim Sung Lee; Jong Hwa Jung

• Book ID: 102164781
• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 417 KB
• Volume: 2008
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200701073

✦ Synopsis

Abstract

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^ mM) 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)