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A Fluorescent Probe Using the Boron and Nitrogen Co-Doped Carbon Dots for the Detection of Hg2+ Ion in Environmental Water Samples

[ Vol. 13 , Issue. 3 ]

Author(s):

Wei Bian, Yakun Wang, Haifen Yang, Ping Li, Qing Yu, Shaomin Shuang, Chuan Dong and Martin M. F. Choi   Pages 242 - 249 ( 8 )

Abstract:


Background: Mercury (Hg2+) ion which is one of the most toxic heavy metals, can pollute the environment and threaten human health due to its features of non-biodegradation and bioaccumulation. Therefore, the detecting of Hg2+ ion is very necessary and has received increasing interest among researchers. The aims of this study is to developed a simple, sensitive and selective fluorescence probe for Hg2+ ion detecting.

Methods: In present work, we use boric acid as boron source, urea as the nitrogen source and citric acid monohydrate as the carbon source to synthesize boron and nitrogen co-doped carbon dots (BNCDs) by microwave heating method. At room temperature, different concentrations of Hg2+ ion were added into BNCDs solution. The fluorescence intensity of BNCDs was measured at an excitation wavelength of 360 nm.

Results: In this study, the as-prepared BNCDs were characterized by multiple analytical techniques such as TEM, FT-IR, UV-vis absorption, XRD, XPS and fluorescence spectra. The BNCDs have exhibited high selectivity and sensitivity to Hg2+ ion with the detection limit of 2.3 nM. A good linear relationship was obtained between corresponding fluorescence intensity and the concentration of Hg2+ ion in the range of 0.0-22.0 μM (r = 0.996) under the optimal conditions. According to the UV-vis absorbance of BNCDs have a small blue shift with the increasing concentration of Hg2+ ion, the Stern- Volmer quenching constant (KSV) value decreasing with the rising of temperature, the lifetime of BNCDs have no change in the presence of different concentrations of Hg2+ ion, the quenching mechanism of the BNCDs-Hg2+ system appears to be mainly static quenching.

Conclusion: The BNCDs were faultlessly synthesized by the microwave heating method in a short time, which was expedient and low cost. The as-prepared BNCDs could be used as a highly sensitive flourescent probe for the quantitative and selective determination of Hg2+ ion. The quenching mechanism between BNCDs and Hg2+ ion was primarily static quenching. This proposed method could be viewed as a fundamental exemplification for a specific nanosensing system towards heavy metal ions in biomedicine and environmental fields.

Keywords:

A fluorescent probe, boron and nitrogen co-doped carbon dots, mercuric ion, environmental water samples, toxic heavy metals, TEM.

Affiliation:

School of Basic Medical Science, Shanxi Medical University, Taiyuan 030001, College of Pharmacy, Shanxi Medical University, Taiyuan 030001, College of Pharmacy, Shanxi Medical University, Taiyuan 030001, College of Pharmacy, Shanxi Medical University, Taiyuan 030001, College of Pharmacy, Shanxi Medical University, Taiyuan 030001, Department of Chemistry and Chemical Engineering, Research Center of Environmental Science and Engineering, Shanxi University, Taiyuan 030006, Department of Chemistry and Chemical Engineering, Research Center of Environmental Science and Engineering, Shanxi University, Taiyuan 030006, Acadia Divinity College, Acadia University, 15 University Avenue, Wolfville, Nova Scotia, B4P 2R6

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