NiO@Carbon quantum dots S-scheme heterojunction as a light-activated oxidase mimic for Cu2+ colorimetric detection

Hu, Shiyu; Han, Zixuan; Yan, Guohao; Hou, Xinghui; Yi, Shasha; Zhang, Zhongtao; Zhou, Ying; Zhang, Liying

doi:10.1016/j.apsusc.2023.158206

Cited by 6 publications

(1 citation statement)

References 50 publications

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“…After the addition of Cu 2+ , the produced photoexcited electrons can reduce Cu 2+ ions back to metal Cu, and O 2 •– can oxidize Cu into CuO. Because Cu 2+ consumed active material, which means it competes with dissolved oxygen for photoexcited electrons, the overall ζ-potential of the system is thus weakened, leading to weak colorimetric reaction between 4-ASA/Gd-CDs and OPD after the addition of Cu 2+ . The relationship between the absorption peak of oxOPD at 450 nm and Cu 2+ concentration can be used to detect Cu 2+ .…”

Section: Resultsmentioning

confidence: 99%

Gadolinium-Doped Carbon Dots with Dual Enzyme Activity for Visual Detection of Cu²⁺ and Antibacterial Applications

Zhao,

Zhang,

Liu

et al. 2024

ACS Appl. Nano Mater.

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The preparation and property studies of long-wavelength-emitting carbon dots (CDs) nanozymes with multifunctions like multienzyme activity nanozymes, antibacterial, and antioxidation have promising prospects in biochemical detection and clinical fields. This paper reports the fast preparation of dual enzyme-like active yellow-green carbon quantum dots (4-ASA/Gd-CDs) through a one-step hydrothermal route with the rare-earth element Gd doping, 4-aminosalicylic acid (4-ASA), and polyethyleneimine (PEI) as raw materials. The prepared CDs nanozymes can produce O 2•− under the irradiation of UV light and rapidly oxidize the colorless substrate o-phenylenediamine (OPD) into yellow 2,3-diaminophenazine (oxOPD); meanwhile, the heavy metal Cu 2+ can strongly coordinate with CDs, leading to electron transfer and the inhibition of CDs-like oxidative enzyme activity, and finally realize the real-time colorimetric detection to Cu 2+ . The limit of detection was as low as 0.38 μM (3σ/k) with a dynamic range from 0 to 38.4 μM. Moreover, the portable hydrogels (CDs-OPD-PSA) were also prepared, and the visual detection of Cu 2+ was achieved with the assistance of a smartphone. The experiment showed that the prepared 4-ASA/Gd-CDs nanozymes exhibited excellent antibacterial ability and superoxide dismutase (SOD)-like activity. The antibacterial mechanisms of CDs against gram-negative/positive bacteria were investigated through the potential value of 4-ASA/Gd-CDs and its own antioxidant activity. The MICs of 4-ASA/Gd-CDs against G + Staphylococcus aureus and Bacillus subtilis are 30 and 17 μg/mL, respectively, and those against G − Escherichia coli and Pseudomonas aeruginosa are 210 and 35 μg/mL, respectively. This research would provide an excellent theoretical and practical basis for the synthesis of dual enzyme-like active CDs and their application in antibacterial and antioxidation fields.

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Section: Resultsmentioning

confidence: 99%

Gadolinium-Doped Carbon Dots with Dual Enzyme Activity for Visual Detection of Cu²⁺ and Antibacterial Applications

Zhao,

Zhang,

Liu

et al. 2024

ACS Appl. Nano Mater.

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UV-induced oxidase activity of carbon dots in visible UVA dosage, Escherichia coli quantification and bacterial typing

Zhao,

Liu,

Zhang

et al. 2024

Analytica Chimica Acta

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One-pot fabrication of g-C3N4-NiO@SnO2 composites for high-performance acetone vapor detection

Gu,

Wang,

et al. 2024

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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NiO@Carbon quantum dots S-scheme heterojunction as a light-activated oxidase mimic for Cu2+ colorimetric detection

Cited by 6 publications

References 50 publications

Gadolinium-Doped Carbon Dots with Dual Enzyme Activity for Visual Detection of Cu²⁺ and Antibacterial Applications

Gadolinium-Doped Carbon Dots with Dual Enzyme Activity for Visual Detection of Cu²⁺ and Antibacterial Applications

UV-induced oxidase activity of carbon dots in visible UVA dosage, Escherichia coli quantification and bacterial typing

One-pot fabrication of g-C3N4-NiO@SnO2 composites for high-performance acetone vapor detection

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NiO@Carbon quantum dots S-scheme heterojunction as a light-activated oxidase mimic for Cu2+ colorimetric detection

Cited by 6 publications

References 50 publications

Gadolinium-Doped Carbon Dots with Dual Enzyme Activity for Visual Detection of Cu2+ and Antibacterial Applications

Gadolinium-Doped Carbon Dots with Dual Enzyme Activity for Visual Detection of Cu2+ and Antibacterial Applications

UV-induced oxidase activity of carbon dots in visible UVA dosage, Escherichia coli quantification and bacterial typing

One-pot fabrication of g-C3N4-NiO@SnO2 composites for high-performance acetone vapor detection

Contact Info

Product

Resources

About

Gadolinium-Doped Carbon Dots with Dual Enzyme Activity for Visual Detection of Cu²⁺ and Antibacterial Applications

Gadolinium-Doped Carbon Dots with Dual Enzyme Activity for Visual Detection of Cu²⁺ and Antibacterial Applications