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

IF 9.1 Q1 ENGINEERING, CHEMICAL Green Chemical Engineering Pub Date : 2023-03-01 DOI:10.1016/j.gce.2022.05.004
Siyuan Sun , Yang Sun , Fan Yang, Sai Che, Xiaoyun Zhang, Ge Zhang, Yongfeng Li
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Abstract

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.

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电化学合成镍掺杂碳量子点用于同时荧光测定Fe3+和Cu2+离子
通过单原子镍分散多孔碳(Ni–N–C)的电解,合成了一种新型的镍掺杂碳量子点(Ni CQDs)荧光探针。所获得的Ni CQD显示出6.3%的高量子产率,具有360 nm和460 nm的最强激发和发射峰,并在3–12的宽pH范围内保持超过90%的最大荧光强度。通过Ni掺杂和官能团修饰提高了Ni CQDs对金属离子的检测能力,并通过动态和静态猝灭机制分别实现了对Fe3+和Cu2+离子的快速和选择性检测。一方面,Ni掺杂调节了Ni CQD的能带隙,使得Ni CQD中的激发电子能够容易地转移到Fe3+。另一方面,丰富的官能团促进了Cu2+和Ni-CQDs之间静态猝灭络合的产生。在金属离子检测中,Fe3+和Cu2+的线性定量范围分别为100–1000μM(R2=0.9955)和300–900μM(R2=0.9978)。检测限(LOD)分别为10.17和7.88μM。此外,由于静态猝灭络合的破坏,被Cu2+猝灭的荧光可以被EDTA2−回收。这样,在Fe3+和Cu2+共存的条件下,Ni-CQDs显示出一定程度上识别两种金属离子的能力。这项工作为高灵敏度的多种金属离子检测铺平了道路。
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来源期刊
Green Chemical Engineering
Green Chemical Engineering Process Chemistry and Technology, Catalysis, Filtration and Separation
CiteScore
11.60
自引率
0.00%
发文量
58
审稿时长
51 days
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