title: Detection of Ag(+) using graphite carbon nitride nanosheets based on fluorescence quenching.
abstract: The graphite carbon nitride (g-C3N4) nanosheets were synthesized and applied for the detection of Ag(+) ion in aqueous solutions. Transmission electron microscopy, Fourier infrared spectroscopy, x-ray diffraction, ultraviolet/visible and photoluminescence spectroscopy were used for characterization of g-C3N4 nanosheets. The fluorescence intensity of g-C3N4 nanosheets decreases with the increase in the concentration of Ag(+). The fluorescence probe can be applied for detection of Ag(+). The results show that it has high selectivity to Ag(+) and exhibits a good linearity over the concentration range 0.020-2.0μM with a detection limit of 27nM. Most cations do not have any interference on the detection of Ag(+). The quenching process is assessed and discussed. Finally, the g-C3N4 nanosheets have been successfully used for the detection of Ag(+) in real water samples. The recoveries of spiked water samples are >97%.
authors.affiliation: School of Basic Medical Science, Shanxi Medical University, Taiyuan 030001, PR China. Electronic address: sxykdx_bianwei@163.com.
authors.forename: Wei
authors.initials: W
authors.lastname: Bian
authors.affiliation: School of Basic Medical Science, Shanxi Medical University, Taiyuan 030001, PR China.
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.affiliation: School of Basic Medical Science, Shanxi Medical University, Taiyuan 030001, PR China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Yu
authors.affiliation: School of Basic Medical Science, Shanxi Medical University, Taiyuan 030001, PR China.
authors.forename: Meijuan
authors.initials: M
authors.lastname: Shi
authors.affiliation: School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, PR China.
authors.forename: Shaomin
authors.initials: S
authors.lastname: Shuang
authors.affiliation: State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, 224 Waterloo Road, Kowloon Tong, Hong Kong SAR, PR China.
authors.forename: Zongwei
authors.initials: Z
authors.lastname: Cai
authors.affiliation: Acadia Divinity College, Acadia University, 15 University Avenue, Wolfville, Nova Scotia B4P 2R6, Canada.
authors.forename: Martin M F
authors.initials: MM
authors.lastname: Choi
keywords: Fluorescence quenching; Silver ion; g-C(3)N(4) nanosheets