Carbon dots-magnetic nanocomposites for the detection and removal of Hg2+

Xie, Ruyan; Qu, Yaoyao; Tang, Mingyu; Zhao, Jing; Chua, Sophie; Li, Ting‐Ting; Fang, Zhang; Wheatley, Andrew E. H.; Chai, Fang

doi:10.1016/j.foodchem.2021.130366

Cited by 42 publications

(23 citation statements)

References 39 publications

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“…Finally, hybrid NPs with fluorescence characteristics and superparamagnetism were synthesized using magnetic iron oxide and fluorescent CDs. Xie et al 70 prepared Fe 3 O 4 /CDs hybrid nanoparticles by a one-step hydrothermal method with melamine and ammonium ferric citrate as carbon and iron sources of composites. Fe 3 O 4 /CDs hybrid nanoparticles were used to monitor and remove heavy metal ion Hg 2+ .…”

Section: Preparation Of Cds/inorganic Nanohybrid Materialsmentioning

confidence: 99%

Carbon dot/inorganic nanomaterial composites

Cai

et al. 2022

J. Mater. Chem. A

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Section: Preparation Of Cds/inorganic Nanohybrid Materialsmentioning

confidence: 99%

Carbon dot/inorganic nanomaterial composites

Cai

et al. 2022

J. Mater. Chem. A

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“…As shown in Figure 5A, Figure 6A, these ions had little effect on the detection of Cd 2+ and Hg 2+ ions. The multiple active sites of N-CDs including carboxylate, hydroxyl groups and abundant amino-groups, Those functional groups led to the interaction between N-CDs and Cd 2+ or Hg 2+ through an effective electron transfer process, which caused the fluorescence quenching of N-CDs (Xie et al, 2021). Therefore, most common ions in fruits and vegetables do not interfere with the detection of Cd 2+ and Hg 2+ ions.…”

Section: Fluorescence Detection Of CD 2+ and Hg 2+mentioning

confidence: 99%

One-step synthesis of highly fluorescent carbon dots as fluorescence sensors for the parallel detection of cadmium and mercury ions

Tan

Wang

et al. 2022

Front. Chem.

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Cadmium (Cd2+) and mercury ions (Hg2+) are essential for the quality control of food samples because of their serious toxicity to human health, but the effective and simple strategy for their parallel detection remains challenging. In this paper, a rapid and simple parallel detection method for Cd2+ and Hg2+ was developed using carbon dots (CDs) as fluorescent sensors. A one-step hydrothermal method with a single precursor l-arginine as both the carbon and nitrogen sources was employed to prepare nitrogen-doped CDs (N-CDs). N-CDs exhibited a uniform particle size and excitation-independent fluorescence emission. The maximum emission wavelength of N-CDs was observed at 354 nm with the excitation wavelength at 295 nm. The quantum yield of N-CDs reached as high as 71.6% in water. By using sodium diphosphate and phytic acid as masking agents, the fluorescent sensor can be quenched by Cd2+ and Hg2+ in the linear range of 0–26.8 μM and 0–49.9 μM within 5 min. Other common ions in farm products showed no significant effect on the fluorescence intensity of the sensing system. The results demonstrated that the sensing system had good selectivity and sensitivity for Cd2+ and Hg2+. The detection limits for Cd2+ and Hg2+ were 0.20 and 0.188 μM, respectively. In addition, the fluorescent sensor had been successfully applied for the detection of Cd2+ and Hg2+ in fruits and vegetables, and the recoveries were 86.44–109.40% and 86.62–115.32%, respectively. The proposed fluorescent sensor provides a rapid, simple, and sensitive detection method for Cd2+ and Hg2+ in food samples and thus a novel quantitative detection method for heavy metal ions in foods.

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“…A linear relationship between the I / I 0 value and concentration of DA can be obtained within the 10–100 nM range with a limit of detection of 3.96 nM (S/N = 3) (based on 3 δ / k ). 39 The colorimetric evolution can be surveyed from Fig. 4c; the fluorescence color variance with the increase of the concentration of DA can be observed by the naked eye, where upon the addition of DA, the fluorescence transformed from orange-red to blue-purple based on the quenching of the FL of the M-AuNCs.…”

Section: Resultsmentioning

confidence: 99%