One-step synthesized fluorescent nitrogen doped carbon dots from thymidine for Cr (VI) detection in water.

A novel, simple and low-cost nitrogen doped carbon dots (N-CDs) fluorescent sensor for sensitive detection of Cr (VI) was developed via one-step hydrothermal method using thymidine as carbon source. As-prepared N-CDs exhibited the ability of sensitive and selective detection of Cr (VI) through the inner filter effect (IFE). The performances of N-CDs were investigated with the characterization methods of transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Under the optimized conditions, a good logarithm correlation between the fluorescence intensity of N-CDS and the concentration of Cr (VI) was obtained ranging from 0.1 μM to 430 μM (R2 = 0.992), with a low detection limit (LOD; S/N = 3) of 1.26 nM. The fluorescent sensor showed good repeatability, reproducibility and stability. Furthermore, N-CDs fluorescent sensor had a good applicability for Cr (VI) detection in real water samples with acceptable recoveries, and the detection results were consistent with the inductively coupled plasma mass spectrometry (ICP-MS) results, indicating this fluorescent sensor has a great potential for the environmental monitoring.

[1]  A. Afkhami,et al.  Construction of a novel "Off-On" fluorescence sensor for highly selective sensing of selenite based on europium ions induced crosslinking of nitrogen-doped carbon dots , 2018 .

[2]  Z. Su,et al.  Multicolorful fluorescent-nanoprobe composed of Au nanocluster and carbon dots for colorimetric and fluorescent sensing Hg2+ and Cr6+ , 2018, Sensors and Actuators B: Chemical.

[3]  W. Guan,et al.  N,S co-doped carbon dots as a stable bio-imaging probe for detection of intracellular temperature and tetracycline. , 2017, Journal of materials chemistry. B.

[4]  Chuanxi Wang,et al.  One-Step Fabrication of Fluorescent Carbon Dots for Selective and Sensitive Detection of Cr (VI) in Living Cells , 2016 .

[5]  M. D. Luna,et al.  Highly fluorescent carbon dots from enokitake mushroom as multi-faceted optical nanomaterials for Cr6+ and VOC detection and imaging applications , 2018, Applied Surface Science.

[6]  R. Tabaraki,et al.  Microwave assisted synthesis of doped carbon dots and their application as green and simple turn off-on fluorescent sensor for mercury (II) and iodide in environmental samples. , 2018, Ecotoxicology and environmental safety.

[7]  Jing-fu Liu,et al.  Nanofluid of zinc oxide nanoparticles in ionic liquid for single drop liquid microextraction of fungicides in environmental waters prior to high performance liquid chromatographic analysis. , 2015, Journal of chromatography. A.

[8]  Kai Yang,et al.  In vivo NIR fluorescence imaging, biodistribution, and toxicology of photoluminescent carbon dots produced from carbon nanotubes and graphite. , 2012, Small.

[9]  L. Ding,et al.  Facile, green and clean one-step synthesis of carbon dots from wool: Application as a sensor for glyphosate detection based on the inner filter effect. , 2016, Talanta.

[10]  Huan Yang,et al.  Fluorescent carbon dots synthesized by microwave-assisted pyrolysis for chromium(VI) and ascorbic acid sensing and logic gate operation. , 2018, Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy.

[11]  Jianhua Hao,et al.  Deep ultraviolet photoluminescence of water-soluble self-passivated graphene quantum dots. , 2012, ACS nano.

[12]  B. K. Gupta,et al.  Graphene quantum dots derived from carbon fibers. , 2012, Nano letters.

[13]  Wangjing Ma,et al.  Easy synthesis of highly fluorescent carbon quantum dots from gelatin and their luminescent properties and applications , 2013 .

[14]  G. Jiang,et al.  Particle coating-dependent interaction of molecular weight fractionated natural organic matter: impacts on the aggregation of silver nanoparticles. , 2015, Environmental science & technology.

[15]  Xiangyou Li,et al.  Preparation of carbon quantum dots with tunable photoluminescence by rapid laser passivation in ordinary organic solvents. , 2011, Chemical communications.

[16]  Yuhui Wang,et al.  Bright-Yellow-Emissive N-Doped Carbon Dots: Preparation, Cellular Imaging, and Bifunctional Sensing. , 2015, ACS applied materials & interfaces.

[17]  X. Qu,et al.  Microwave assisted one-step green synthesis of cell-permeable multicolor photoluminescent carbon dots without surface passivation reagents , 2011 .

[18]  Hong Zhao,et al.  A highly sensitive and selective detection of Cr(VI) and ascorbic acid based on nitrogen-doped carbon dots. , 2018, Talanta.

[19]  Jongsung Kim,et al.  Synthesis of carbon quantum dots from Broccoli and their ability to detect silver ions , 2018 .

[20]  Chengzhou Zhu,et al.  Bifunctional fluorescent carbon nanodots: green synthesis via soy milk and application as metal-free electrocatalysts for oxygen reduction. , 2012, Chemical Communications.

[21]  X. Shan,et al.  Separation of Cr(III) and Cr(VI) in river and reservoir water with 8-hydroxyquinoline immobilized polyacrylonitrile fiber for determination by inductively coupled plasma mass spectrometry. , 2002, Talanta.

[22]  D. Huo,et al.  Colorimetric detection of Cr (VI) based on the leaching of gold nanoparticles using a paper-based sensor. , 2016, Talanta.

[23]  T. Maeder,et al.  Screen-printed electrodes for electroanalytical sensing, of chromium VI in strong acid media , 2014 .

[24]  S. Paria,et al.  A simple turn on fluorescent sensor for the selective detection of thiamine using coconut water derived luminescent carbon dots. , 2016, Biosensors & bioelectronics.

[25]  Yafei Zhang,et al.  Fast one-step synthesis of N-doped carbon dots by pyrolyzing ethanolamine , 2014 .

[26]  Xiaoyun Qin,et al.  Hydrothermal Treatment of Grass: A Low‐Cost, Green Route to Nitrogen‐Doped, Carbon‐Rich, Photoluminescent Polymer Nanodots as an Effective Fluorescent Sensing Platform for Label‐Free Detection of Cu(II) Ions , 2012, Advanced materials.

[27]  Young-Chul Lee,et al.  Photoluminescent green carbon nanodots from food-waste-derived sources: large-scale synthesis, properties, and biomedical applications. , 2014, ACS applied materials & interfaces.

[28]  Zhijun Zhu,et al.  Multifunctional water-soluble luminescent carbon dots for imaging and Hg2+ sensing. , 2014, Journal of materials chemistry. B.

[29]  A. Afkhami,et al.  Green and cost-effective synthesis of carbon dots from date kernel and their application as a novel switchable fluorescence probe for sensitive assay of Zoledronic acid drug in human serum and cellular imaging. , 2018, Analytica chimica acta.

[30]  Yang Liu,et al.  One-step ultrasonic synthesis of fluorescent N-doped carbon dots from glucose and their visible-light sensitive photocatalytic ability , 2012 .

[31]  Ningning Zhu,et al.  Colorimetric determination of hexavalent chromium with ascorbic acid capped silver nanoparticles , 2013 .

[32]  J. Chwastowska,et al.  Speciation of chromium in mineral waters and salinas by solid-phase extraction and graphite furnace atomic absorption spectrometry. , 2005, Talanta.

[33]  X. Zheng,et al.  Glowing graphene quantum dots and carbon dots: properties, syntheses, and biological applications. , 2015, Small.

[34]  Huan‐Tsung Chang,et al.  Electrochemical synthesis of photoluminescent carbon nanodots from glycine for highly sensitive detection of hemoglobin , 2014 .

[35]  Zhiqiang Gao,et al.  Carbon quantum dots and their applications. , 2015, Chemical Society reviews.

[36]  E. Tanabe,et al.  Kinetics of nitrogen-doped carbon dot formation via hydrothermal synthesis , 2016 .

[37]  Qin Xu,et al.  A subnanomole level photoelectrochemical sensing platform for hexavalent chromium based on its selective inhibition of quercetin oxidation. , 2013, The Analyst.

[38]  M. Valderrama,et al.  Determination of chromium in urine samples by complexation-supercritical fluid extraction and liquid or gas chromatography. , 2003, Journal of chromatography. B, Analytical technologies in the biomedical and life sciences.

[39]  M. Schiavon,et al.  High luminescent carbon dots as an eco-friendly fluorescence sensor for Cr(VI) determination in water and soil samples , 2017 .

[40]  D. Huo,et al.  Colorimetric sensing of chromium(VI) ions in aqueous solution based on the leaching of protein-stabled gold nanoparticles , 2016 .

[41]  Xiaoming Yang,et al.  Novel and green synthesis of high-fluorescent carbon dots originated from honey for sensing and imaging. , 2014, Biosensors & bioelectronics.

[42]  Weijian Liu,et al.  The selectivity of the carboxylate groups terminated carbon dots switched by buffer solutions for the detection of multi-metal ions , 2017 .