title: A facile microwave-assisted fabrication of fluorescent carbon nitride quantum dots and their application in the detection of mercury ions.
abstract: A facile microwave-assisted solvothermal method was used to prepare fluorescent carbon nitride quantum dots (CNQDs) using oleic acid as the reaction media at moderate reaction temperature in a short time (5 min). Citric acid monohydrate and urea were used as the precursors. The as-prepared CNQDs were characterized by multiple analytical techniques. The CNQDs exhibited an uncommon excitation wavelength-dependent fluorescence with two maximum emission peaks at 450 and 540 nm. The CNQDs with a quantum yield of 27.1% could serve as an effective fluorescent sensing platform for label-free sensitive detection of Hg(2+) ions with a detection limit of 0.14 μM. This method was also applied to the detection of Hg(2+) ions in tap water samples.
authors.affiliation: College of Chemistry and Environment, 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: College of Chemistry and Environment, 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: College of Chemistry and Environment, 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: College of Chemistry and Environment, 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: College of Chemistry and Environment, 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: College of Chemistry and Environment, 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: College of Environmental and Engineering, Putian University, Putian 351100, China.
authors.forename: Xiuchun
authors.initials: X
authors.lastname: Lin
mesh_terms: D005453:Fluorescence; D057230:Limit of Detection; D008628:Mercury / Q000032:analysis*; D046529:Microscopy, Electron, Transmission; D008872:Microwaves; D009570:Nitriles / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D045663:Quantum Dots; D012680:Sensitivity and Specificity; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000032:analysis
chemical_list: D009570:Nitriles; D014867:Water; C011206:cyanogen; D008628:Mercury
keywords: Carbon nitride quantum dots; Citric acid; Fluorescent probe; Mercury ions; Urea