title: Architecture of optical sensor for recognition of multiple toxic metal ions from water.
abstract: Here, we designed novel optical sensor based on the wormhole hexagonal mesoporous core/multi-shell silica nanoparticles that enabled the selective recognition and removal of these extremely toxic metals from drinking water. The surface-coating process of a mesoporous core/double-shell silica platforms by several consequence decorations using a cationic surfactant with double alkyl tails (CS-DAT) and then a synthesized dicarboxylate 1,5-diphenyl-3-thiocarbazone (III) signaling probe enabled us to create a unique hierarchical multi-shell sensor. In this design, the high loading capacity and wrapping of the CS-DAT and III organic moieties could be achieved, leading to the formation of silica core with multi-shells that formed from double-silica, CS-DAT, and III dressing layers. In this sensing system, notable changes in color and reflectance intensity of the multi-shelled sensor for Cu(2+), Co(2+), Cd(2+), and Hg(2+) ions, were observed at pH 2, 8, 9.5 and 11.5, respectively. The multi-shelled sensor is added to enable accessibility for continuous monitoring of several different toxic metal ions and efficient multi-ion sensing and removal capabilities with respect to reversibility, selectivity, and signal stability.
authors.affiliation: National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.
authors.forename: M A
authors.initials: MA
authors.lastname: Shenashen
authors.forename: S A
authors.initials: SA
authors.lastname: El-Safty
authors.forename: E A
authors.initials: EA
authors.lastname: Elshehy
mesh_terms: D002104:Cadmium / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D060766:Drinking Water; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000032:analysis*; D007700:Kinetics; D008628:Mercury / Q000737:chemistry; D008670:Metals / Q000032:analysis*; D053758:Nanoparticles / Q000737:chemistry; D055096:Optical Devices; D055095:Optics and Photonics; D015203:Reproducibility of Results; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*; D014881:Water Supply
chemical_list: D060766:Drinking Water; D007477:Ions; D008670:Metals; D014874:Water Pollutants, Chemical; D002104:Cadmium; D003035:Cobalt; D012822:Silicon Dioxide; D003300:Copper; D008628:Mercury
keywords: Core/double shell silica; Multi-shell; Optical; Sensor; Toxic metal ions; Water