title: One-pot fabrication of hollow cross-linked fluorescent carbon nitride nanoparticles and their application in the detection of mercuric ions.
abstract: Hollow cross-linked fluorescent carbon nitride nanoparticles (CNNPs) were fabricated via a facile one-pot solvothermal process. The obtained CNNPs were characterized by multiple analytical techniques including transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), solid-state nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR). The excitation-dependent fluorescence emission spectra showed significant differences for the CNNPs derived from various proportions of citric acid monohydrate and urea. The fluorescence quantum yield of the obtained CNNPs could reach 31%. The CNNPs exhibited good fluorescence quenching selectivity to mercuric ions. Concentration experiments showed that there existed two parts of linear relationship between fluorescence intensity and concentration of Hg(2+) ions in the range of 0.1-8 and 8-32 μM. The limit of detection (LOD) was estimated to be 0.094 μM. This method can be applied to the detection of Hg(2+) ions in tap water samples.
authors.affiliation: Department of Chemistry and Environmental Science, Minnan Normal University, Zhangzhou 363000, China; Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, Zhangzhou 363000, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Ma
authors.affiliation: Department of Chemistry and Environmental Science, Minnan Normal University, Zhangzhou 363000, China; Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, Zhangzhou 363000, China.
authors.forename: Baoling
authors.initials: B
authors.lastname: Guo
authors.affiliation: Department of Chemistry and Environmental Science, Minnan Normal University, Zhangzhou 363000, China; Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, Zhangzhou 363000, China.
authors.forename: Xiaotong
authors.initials: X
authors.lastname: Cao
authors.affiliation: Department of Chemistry and Environmental Science, Minnan Normal University, Zhangzhou 363000, China; Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, Zhangzhou 363000, China.
authors.forename: Yanping
authors.initials: Y
authors.lastname: Lin
authors.affiliation: Department of Chemistry and Environmental Science, Minnan Normal University, Zhangzhou 363000, China; Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, Zhangzhou 363000, China.
authors.forename: Bixia
authors.initials: B
authors.lastname: Yao
authors.affiliation: Department of Chemistry and Environmental Science, Minnan Normal University, Zhangzhou 363000, China; Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, Zhangzhou 363000, China.
authors.forename: Feiming
authors.initials: F
authors.lastname: Li
authors.affiliation: Department of Chemistry and Environmental Science, Minnan Normal University, Zhangzhou 363000, China; Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, Zhangzhou 363000, China. Electronic address: weng_wen@126.com.
authors.forename: Wen
authors.initials: W
authors.lastname: Weng
authors.affiliation: Zhangzhou Product Quality Supervision Institute, Zhangzhou 363000, China.
authors.forename: Lizhang
authors.initials: L
authors.lastname: Huang
mesh_terms: D019343:Citric Acid / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry*; D057230:Limit of Detection; D008628:Mercury / Q000032:analysis* / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods*; D009570:Nitriles / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D014508:Urea / Q000737:chemistry
chemical_list: D005456:Fluorescent Dyes; D009570:Nitriles; D012997:Solvents; D019343:Citric Acid; C011206:cyanogen; D014508:Urea; D008628:Mercury
keywords: Carbon nitride nanoparticles; Citric acid; Fluorescent probe; Mercuric ions; Quenching; Urea