title: Biologically green synthesized silver nanoparticles as a facile and rapid label-free colorimetric probe for determination of Cu2+in water samples.
abstract: A highly sensitive and cost-effective colorimetric sensing platform for the selective trace analysis of Cu2+ions was developed based on the accelerated etching of Riboflavin stabilized silver nanoparticles (R/AgNPs). The R/AgNPs were prepared from the Cucumis melo juice by a green chemistry approach. The bio-synthesized AgNPs were studied by UV-Vis spectroscopy and showed an intense absorption band at 404nm that were further confirmed by FTIR and EDS analysis. Simultaneous presence of Cu2+and thiosulfate decreased the absorption intensity of green synthesized AgNPs which resulted in sensitive and selective determination of Cu2+. The selectivity of R/AgNPs detection system for Cu2+was excellent. Furthermore, the method offered a wide linear detection range from 5nM to 100nM with a detection limit of 1.12nM. Surprisingly, it was a quick approach and the decolorization of the R/AgNPs solutions occurred only within 5min. Our results clearly indicate these R/AgNPs could be used as an efficient probe for the colorimetric sensing of Cu2+in environmental water samples.
authors: Department of Chemistry, Faculty of Science, K. N. Toosi University of Technology, Tehran, Iran.
authors: Sedigheh
authors: S
authors: Basiri
authors: Department of Marine Living Science, Ocean Sciences Research Center, Iranian National Institute for Oceanography and Atmospheric Science, Tehran, Iran. Electronic address: mehdinia@inio.ac.ir.
authors: Ali
authors: A
authors: Mehdinia
authors: Department of Chemistry, Faculty of Science, K. N. Toosi University of Technology, Tehran, Iran.
authors: Ali
authors: A
authors: Jabbari
mesh_terms: D002021:Buffers; D003124:Colorimetry / Q000379:methods*; D003300:Copper / Q000032:analysis*; D055772:Green Chemistry Technology / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D053768:Metal Nanoparticles / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry; D012256:Riboflavin / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013194:Staining and Labeling; D013696:Temperature; D013885:Thiosulfates / Q000737:chemistry; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D002021:Buffers; D010936:Plant Extracts; D013885:Thiosulfates; D014874:Water Pollutants, Chemical; D012834:Silver; D003300:Copper; C017717:sodium thiosulfate; D012256:Riboflavin
keywords: Colorimetric sensor; Copper; Cucumis melo juice; Etching; Silver nanoparticles