Siyuan Sun , Yang Sun , Fan Yang, Sai Che, Xiaoyun Zhang, Ge Zhang, Yongfeng Li
{"title":"Electrochemical synthesis of Ni doped carbon quantum dots for simultaneous fluorometric determination of Fe3+ and Cu2+ ion facilely","authors":"Siyuan Sun , Yang Sun , Fan Yang, Sai Che, Xiaoyun Zhang, Ge Zhang, Yongfeng Li","doi":"10.1016/j.gce.2022.05.004","DOIUrl":null,"url":null,"abstract":"<div><p>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 Fe<sup>3+</sup> and Cu<sup>2+</sup> 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 Fe<sup>3+</sup> easily. On the other hand, the abundant functional groups promoted the generation of static quenching complexation between Cu<sup>2+</sup> and Ni-CQDs. In metal ions detection, the linear quantitation range of Fe<sup>3+</sup> and Cu<sup>2+</sup> were 100–1000 μM (R<sup>2</sup> = 0.9955) and 300–900 μM (R<sup>2</sup> = 0.9978), respectively. The limits of detection (LOD) were calculated as 10.17 and 7.88 μM, respectively. Moreover, the fluorescence quenched by Cu<sup>2+</sup> could be recovered by EDTA<sup>2−</sup> 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 Fe<sup>3+</sup> and Cu<sup>2+</sup> coexistent. This work paves the way of facile multiple metal ion detection with high sensitivity.</p></div>","PeriodicalId":66474,"journal":{"name":"Green Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":9.1000,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Green Chemical Engineering","FirstCategoryId":"1089","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666952822000474","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
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.