title: Optical detection/collection of toxic Cd(II) ions using cubic Ia3d aluminosilica mesocage sensors.
abstract: 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 α, β, γ, and δ-tetrakis(1-methylpyridinium-4-yl)porphine ρ-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 Ia3d 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.
authors.affiliation: National Institute for Materials Science (NIMS), Exploratory Materials Research Laboratory for Energy and Environment, 1-2-1 Sengen, Tsukuba-shi, Ibaraki-ken 305-0047, Japan. sherif.elsafty@nims.go.jp
authors.forename: Sherif A
authors.initials: SA
authors.lastname: El-Safty
authors.forename: Mohamed A
authors.initials: MA
authors.lastname: Shenashen
authors.forename: Mohamed
authors.initials: M
authors.lastname: Khairy
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D002104:Cadmium / Q000032:analysis*; D002413:Cations, Divalent; D004867:Equipment Design; D017743:Equipment Reuse; D006863:Hydrogen-Ion Concentration; D046529:Microscopy, Electron, Transmission; D055096:Optical Devices; D011166:Porphyrins / Q000737:chemistry; D053838:Scattering, Small Angle; D012821:Silanes / Q000737:chemistry; D013439:Sulfhydryl Reagents / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014961:X-Ray Diffraction
chemical_list: D000538:Aluminum Silicates; D002413:Cations, Divalent; D011166:Porphyrins; D012821:Silanes; D013439:Sulfhydryl Reagents; D014874:Water Pollutants, Chemical; D002104:Cadmium; C049037:aluminosilicate; C021096:tetra(4-N-methylpyridyl)porphine