Carbon dots prepared by thermal reactions and selective detections of copper and mercury ions in visible spectrum

2021 ◽  
Vol 127 (5) ◽  
Author(s):  
Lin Ge ◽  
Guangkuo Hu ◽  
Fengjiao Zhao ◽  
Xinyi Wang ◽  
Zhonglin Ma ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Visible Spectrum ◽  
Mercury Ions ◽  
Thermal Reactions

Nitrogen-doped carbon dots from Hutai-8 grape skin and their application in Hg2+ detection

2020 ◽  
Vol 16 ◽  
Author(s):  
Pan Zhang ◽  
Shun-Sheng Zhao ◽  
JiaJia Wang ◽  
Xiang Rong Liu
Keyword(s):  
Heavy Metal ◽  
Carbon Source ◽  
Fluorescence Quenching ◽  
Hydrothermal Method ◽  
Water Samples ◽  
Carbon Dots ◽  
Mercury Ions ◽  
Grape Skin ◽  
Fluorescent Carbon Dots ◽  
Fluorescent Carbon

Background: In recent years, environmental pollution and heavy metal pollution caused by rapid urbanization and industrialization have become increasingly serious. Among them, mercury (II) ion (Hg2+) is one of the highly toxic heavy metal ions, and its pollution comes from various natural resources and human activities. Therefore, people attach great importance to the development of analytical methods for effective analysis and sensitive detection of Hg2+ . Objective: Using grape skin as a green and environmental friendly carbon source, to synthesize fluorescent carbon dots, and try to apply them to the detect the concentration of Hg2+ in water. Method: Using "Hutai No. 8" grape skin as carbon source, fluorescent carbon dots were synthesized by one-step hydrothermal method. Structure and fluorescent properties of the carbon dots were tested using TEM, XPS, XRD and other characterization instruments, and their utilization on detection of mercury ions in the actual water samples was explored. Results: The CDs had a particle size of about 4.8 nm and a spherical shape. There are N-H, C-N, C=O and other functional groups on the surface. It was found that Hg2+ has obvious fluorescence quenching effect on CDs, and thus CDs fluorescence quenching method to detect the concentration Hg2+ was established, and the detection limit is 3.7 μM, which could be applied to test the concentration of Hg2+ in water samples. Conclusion: Using grape skin as carbon source, fluorescent carbon dots were successfully synthesized by hydrothermal method. Carbon dots were used to detect mercury ions in water, and a method for detecting mercury ions in actual water samples was established.

Nitrogen-doped, thiol-functionalized carbon dots for ultrasensitive Hg(ii) detection

2015 ◽  
Vol 51 (53) ◽  
pp. 10750-10753 ◽  
Author(s):  
Abhishek Gupta ◽  
Abhishek Chaudhary ◽  
Pooja Mehta ◽  
Charu Dwivedi ◽  
Syamantak Khan ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Sensitive Detection ◽  
Mercury Ions ◽  
Nitrogen Doped

Nitrogen-doped, PEGylated carbon dots (C-dots) have been synthesized for the ultra sensitive detection of mercury ions (Hg2+).

scholarly journals Detection of Melamine Based on the Fluorescence Changes of Nitrogen-Doped Carbon Dots

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Wenzhi Yin ◽  
Chaoqun Ma ◽  
Tuo Zhu ◽  
Jiao Gu ◽  
Chun Zhu ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Detection Method ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Mercury Ions ◽  
Measuring Range ◽  
Nitrogen Doped ◽  
One Step ◽  
Doped Carbon Dots ◽  
Nitrogen Doped Carbon

In order to determine the concentration of melamine, nitrogen-doped carbon dots (NCDs) were synthesized in one step as a fluorescent probe. Uric acid and diethylenetriamine were used as carbon source and nitrogen source, respectively. The experimental results showed that the fluorescence of NCDs can be quenched by mercury ions (Hg2+). Due to the strong coordination affinity between the carbon-nitrogen heterocyclic of melamine and Hg2+, part of Hg2+ coordinated with melamine when melamine was mixed with Hg2+. Then, the fluorescence of the added NCDs was quenched by the remaining Hg2+. Therefore, the concentration of melamine could be determined. The results show that the method has high sensitivity in wide measuring range that the linear ranges are 50–400 μg/L and 800–2500 μg/L, and the R2 is 0.997 and 0.988, respectively, with the limit of detection (LOD) of 21.76 μg/L. The NCDs are easy to fabricate, and the detection method is easy to implement. In this study, a new method for melamine detection was established, and the proposed method for melamine detection can provide some insights for food safety detection.

Mercury Ions Mediated Phosphorus Containing Carbon Dots as Fluorescent Probe for Biothiols Screening

NANO ◽  
2018 ◽  
Vol 13 (10) ◽  
pp. 1850116
Author(s):  
Han Du ◽  
Hu Xu ◽  
Yun Zhao ◽  
Dan Li ◽  
Yuhong Wang
Keyword(s):  
Electron Transfer ◽  
Molecular Orbital ◽  
Carbon Dots ◽  
Fluorescence Probe ◽  
Hydrothermal Reaction ◽  
Electron Transition ◽  
Mercury Ions ◽  
Highest Occupied Molecular Orbital ◽  
Phosphorus Containing ◽  
Lowest Unoccupied Molecular Orbital

In this study, we report the mercury ions (Hg[Formula: see text]) mediated phosphorus-containing carbon dots (PCDs) as a selective “off–on” fluorescence probe for glutathione (GSH), cysteine (Cys) and homocysteine (Hcys). PCDs obtained by hydrothermal reaction are sensitive to Hg[Formula: see text] ions and its fluorescence can be significantly quenched owing to the electron transfer from the lowest unoccupied molecular orbital (LUMO) of PCDs to Hg[Formula: see text]. Interestingly, the weak fluorescence of Hg[Formula: see text]-mediated PCDs could be gradually recovered with the addition of GSH, Cys and Hcys. This can be attributed to the formation of Hg[Formula: see text]–S complex due to the super affinity of Hg[Formula: see text]–sulfydryl bond. The formation of Hg[Formula: see text]–S complex extremely reduces the oxidation ability of Hg[Formula: see text] that inhibits the electron transfer from LUMO of PCDs to Hg[Formula: see text] and re-opens the native electron transition from LUMO to the highest occupied molecular orbital (HOMO) of PCDs. Thus, the green fluorescence of PCDs is switched on. Furthermore, the present Hg[Formula: see text]-mediated PCDs assay exhibits a high selectivity for GSH, Cys and Hcy and has been successfully used to detect the total biothiols content in human urine samples.

scholarly journals Synthesis of Carbon dots-based Fluorescent Probe for the High Selective Detection of Mercury Ions

2018 ◽  
Author(s):  
Li Song ◽  
Yanyan Cui
Keyword(s):  
Metal Ions ◽  
Carbon Dots ◽  
Water Solution ◽  
Water System ◽  
Average Diameter ◽  
Transition Metal Ions ◽  
Environmental Water ◽  
Mercury Ions ◽  
One Pot ◽  
Fluorescent Carbon Dots

Fluorescent carbon dots (C-dots) were synthesized by one pot hydrothermal treatment of garlic juice at 180 °C for 7h. The as-prepared C-dots with an average diameter of 2.13±0.71 nm can be well dispersed, and show absinthe fluorescence with a quantum yield of 8.9% in water. The C-dots were fully characterized by TEM, XPS, XRD, and FTIR, respectively. Additionally, the as-prepared C-dots reveal nearly nontoxic to SW480 cells and can be used for cell imaging. The water solution of C-dots show sensitivity to pH values and metal ions, and also have a high selectivity to the Hg2+ ion among other transition metal ions, and achieve a high sensitive detection with the detection limit of 0.45 μM. The fluorescent C-dots are expected to be useful for the evaluation of mercury ions in environmental water system.

Highly Efficiency Fluorescent Probe for Mercury Ions Based on (N, S)‐Co‐Doped Carbon Dots

2021 ◽  
Vol 6 (47) ◽  
pp. 13472-13478
Author(s):  
Wenge Zhang ◽  
Suqin Deng ◽  
Chao Yan ◽  
Zifan Zhu ◽  
Peiying Li ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Carbon Dots ◽  
Mercury Ions ◽  
Doped Carbon Dots ◽  
Co Doped

scholarly journals A Comparative Study of Top-Down and Bottom-Up Carbon Nanodots and Their Interaction with Mercury Ions

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1265
Author(s):  
Federico Bruno ◽  
Alice Sciortino ◽  
Gianpiero Buscarino ◽  
Maria Laura Soriano ◽  
Ángel Ríos ◽  
...  
Keyword(s):  
Optical Properties ◽  
Carbon Dots ◽  
Carbon Nanodots ◽  
Fluorescent Nanoparticles ◽  
Mercury Ions ◽  
Top Down ◽  
Structural And Optical Properties ◽  
Bottom Up ◽  
Interaction Sites ◽  
Sensing Applications

We report a study of carbon dots produced via bottom-up and top-down routes, carried out through a multi-technique approach based on steady-state fluorescence and absorption, time-resolved fluorescence spectroscopy, Raman spectroscopy, infrared spectroscopy, and atomic force microscopy. Our study focuses on a side-to-side comparison of the fundamental structural and optical properties of the two families of fluorescent nanoparticles, and on their interaction pathways with mercury ions, which we use as a probe of surface emissive chromophores. Comparison between the two families of carbon dots, and between carbon dots subjected to different functionalization procedures, readily identifies a few key structural and optical properties apparently common to all types of carbon dots, but also highlights some critical differences in the optical response and in the microscopic mechanism responsible of the fluorescence. The results also provide suggestions on the most likely interaction sites of mercury ions at the surface of carbon dots and reveal details on mercury-induced fluorescence quenching that can be practically exploited to optimize sensing applications of carbon dots.

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