Journal
TALANTA
Volume 98, Issue -, Pages 69-78Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2012.06.046
Keywords
Cubic la3d; Sensors; Optical; Cadmium; Removal; Detection
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Optical sensors for selective removal and detection of extremely toxic ions such as cadmium (Cd-II) in aquatic samples were successfully fabricated via simple strategy. Aluminosilica-based network platforms are used as selective mesopore shape and size carriers in order to fabricate optical sensors through the direct functionalization of alpha, beta, gamma, and delta-tetrakis(1-methylpyridinium-4-yl)porphine p-toluenesulfonate (TMPyP) moieties without any prior surface modification using silane or thiol agents. In turn, the key advantage of a heretical three-dimensional (3D) cubic la3d mesocage is the facile access of target ions such as ion transports and the high affinity responses of TMPyP receptor-Cd(II) analyte binding events, which result in the easy generation and transduction of optical signals even at the trace level of the Cd(II) ion. The optical sensor design-based aluminosilica cages enable the sensitive detection and selective removal of Cd(II) ions even at ultra-trace concentrations of 10(-10) mol/dm(3) with rapid response time (in minutes). This rational strategy is crucial to the development of optical mesocollectors (i.e., probe surface-mounted naked-eye ion-sensor strips) with highly selective Cd(II) ion removal from aqueous water. These new classes of optical mesocollectors exhibit long-term stability and reusability of deleterious Cd(II) ions, which makes them efficient for various analytical applications. (C) 2012 Elsevier B.V. All rights reserved.
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