title: Rapid detection of Cr(VI) ions based on cobalt(II)-doped carbon dots.
abstract: A new type of cobalt(II)-doped carbon dots (CCDs) have been fabricated and used successfully for sensing Cr(VI) ions on the basis of photoluminescence quenching. The structural characterization of as-obtained CCDs was thoroughly performed by transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) and X-ray photoelectron (XPS) spectroscopy. The optical properties were also determined by absorption and fluorescence spectra. By recording 3D fluorescence spectrum, a unique intra-particle Förster resonance energy transfer (FRET) system was investigated. In addition, fluorescence quenching of CCDs was observed in the presence of Cr(VI) ions due to inner filter effect. A good linear relationship between the concentration of Cr(VI) ions and fluorescent intensity was obtained in the range from 5μM to 125μM (R2=0.99), and the limit of detection was calculated as 1.17μM (0.12ppm for Cr(VI)). Importantly, this method was capable of rapidly detecting Cr(VI) ions in tap water and fish samples, which may be helpful in risk reduction of intake Cr(VI) contamination from water and seafood.
authors: School of Food Science & Technology, Dalian Polytechnic University, Dalian, Liaoning 116034, PR China.
authors: Hong-Yu
authors: HY
authors: Zhang
authors: Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, PR China.
authors: Yu
authors: Y
authors: Wang
authors: School of Food Science & Technology, Dalian Polytechnic University, Dalian, Liaoning 116034, PR China.
authors: Shan
authors: S
authors: Xiao
authors: School of Food Science & Technology, Dalian Polytechnic University, Dalian, Liaoning 116034, PR China.
authors: Han
authors: H
authors: Wang
authors: School of Food Science & Technology, Dalian Polytechnic University, Dalian, Liaoning 116034, PR China. Electronic address: wangjh@dlpu.edu.cn.
authors: Ji-Hui
authors: JH
authors: Wang
authors: Key Lab of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning 116023, PR China. Electronic address: fengl@dicp.ac.cn.
authors: Liang
authors: L
authors: Feng
mesh_terms: D000818:Animals; D015374:Biosensing Techniques / Q000379:methods; D002244:Carbon / Q000737:chemistry*; D002857:Chromium / Q000032:analysis*; D003035:Cobalt / Q000737:chemistry*; D060766:Drinking Water / Q000032:analysis*; D005399:Fishes / Q000378:metabolism; D057230:Limit of Detection; D045663:Quantum Dots / Q000737:chemistry / Q000648:ultrastructure; D013050:Spectrometry, Fluorescence / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D060766:Drinking Water; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D003035:Cobalt; D002244:Carbon
keywords: Carbon dot; Cobalt; Cr(VI); Fish; Rapid detection; Water