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High Quantum Yield Fluorescent Chitosan-Based Carbon Dots for the Turn-On-Off-On Detection of Cr(VI) and H₂O₂

Yudong Zhang

School of Chemistry Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China

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Yan Dong

School of Chemistry Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China

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Haifu Zheng

Chemical Institute of Metrology, Jiangsu, Nanjing 210023, P. R. China

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Xueyun Yang

https://orcid.org/0000-0002-0545-8665

School of Chemistry Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China

E-mail Address: yangxueyun@njtech.edu.cn

Corresponding author.

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, and

Cheng Yao

School of Chemistry Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China

E-mail Address: yaocheng@njtech.edu.cn

Corresponding author.

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https://doi.org/10.1142/S1793292021501034Cited by:5 (Source: Crossref)

Abstract

One-pot hydrothermal carbonization approach was employed to synthesize the blue-emission carbon dots derived from chitosan (Cs) and o-phenylenediamine (OPD). The Cs-based carbon dots (Cs–CDs) possessed a certain high quantum yield of 58% and exhibited excellent solubility, stability and fluorescence response in aqueous solutions. The Cs–CDs were designed as a sensor for Cr(VI) and H₂O₂ determination. The sensing strategy of Cr(VI) was based on the inner filter effect (IFE) and static quenching effect (SQE), showing a good linear correlation ranging from 1 to 130 $μ$ M with a detection limit (LOD) of 0.91 $μ$ M. In addition, the determination for H₂O₂ was attributed to the elimination of IFE (EIFE) due to the reduction reaction and the detection for H₂O₂ was in the linear range from 1.0 to 200.0 $μ$ M with LOD of 0.51 $μ$ M. Finally, the proposed designed sensor could be simply applied for detection of Cr(VI) and H₂O₂ in real samples.

Keywords:

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