首页|Electrochemical synthesis of Ni doped carbon quantum dots for simultaneous fluorometric determination of Fe3+ and Cu2+ ion facilely

Electrochemical synthesis of Ni doped carbon quantum dots for simultaneous fluorometric determination of Fe3+ and Cu2+ ion facilely

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A novel Ni doped carbon quantum dots(Ni-CQDs)fluorescence probe was synthesized by facile electrolysis of monoatomic Ni dispersed porous carbon(Ni-N-C).The obtained Ni-CQDs showed a high quantum yield of 6.3％with the strongest excitation and emission peaks of 360 nm and 460 nm,and maintained over 90％of the maximum fluorescence intensity in a wide pH range of 3-12.The metal ions detectability of Ni-CQDs was enhanced by Ni doping and functional groups modification,and the rapid and selective detection of Fe3+and Cu2+ions was achieved with Ni-CQDs through dynamic and static quenching mechanism,respectively.On one hand,the energy band gap of Ni-CQDs was regulated by Ni doping,so that excited electrons in Ni-CQDs were able to transfer to Fe3+easily.On the other hand,the abundant functional groups promoted the generation of static quenching complexation between Cu2+and Ni-CQDs.In metal ions detection,the linear quantitation range of Fe3+and Cu2+were 100-1000 μM(R2=0.9955)and 300-900 μM(R2=0.9978),respectively.The limits of detection(LOD)were calculated as 10.17 and 7.88 μM,respectively.Moreover,the fluorescence quenched by Cu2+could be recovered by EDTA2-due to the destruction of the static quenching complexation.In this way,Ni-CQDs showed the ability to identify the two metal ions to a certain degree under the condition of Fe3+and Cu2+coexistent.This work paves the way of facile multiple metal ion detection with high sensitivity.

ElectrolysisNi doped CQDsFe3+detectionCu2+detectionIons distinction

Siyuan Sun、Yang Sun、Fan Yang、Sai Che、Xiaoyun Zhang、Ge Zhang、Yongfeng Li

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State Key Laboratory of Heavy Oil Processing China University of Petroleum,Beijing,102249,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaScience Foundation of China University of Petroleum,Beijing

21776302217763082462020YXZZ033

2023

绿色化学工程(英文)
中国科学院过程工程研究所

绿色化学工程(英文)

CSCD
ISSN：
年,卷(期)：2023.4(1)
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