Huijing Chen, Bo Peng, Ping Zhang, Ying Yang and Xue Hu
{"title":"“Turn-on” fluorescence sensing for sensitively detecting Cr(vi) via a guest exchange process in Cu NCs@MIL-101 composites†","authors":"Huijing Chen, Bo Peng, Ping Zhang, Ying Yang and Xue Hu","doi":"10.1039/D4AY00956H","DOIUrl":null,"url":null,"abstract":"<p >Copper nanoclusters (Cu NCs) are a new fluorescent material that is often used for determining metal ions, but most sensing systems are based on the “turn-off” model. Here, a “turn-on” model of fluorescence sensing for the detection of Cr(<small>VI</small>) was developed based on Cu NCs@MIL-101 composites. The Cu NCs@MIL-101 composites were synthesized from a simple mixture of Cu NCs and MIL-101(Cr), in which the Cu NCs were uniformly distributed in MIL-101(Cr). Notably, the fluorescence intensity of Cu NCs@MIL-101 was significantly weakened due to the internal filtration effect (IFE) of MIL-101. When Cr(<small>VI</small>) was introduced, the fluorescence of Cu NCs@MIL-101 was recovered by the guest exchange process between Cr(<small>VI</small>) and the Cu NCs, which overcame the IFE of Cu NCs@MIL-101. Based on this, a “turn-on” fluorescence probe was successfully constructed for the quantitative detection of Cr(<small>VI</small>) with two linear ranges of 0.05–1 μM and 1–20 μM, and a low detection limit of 0.05 μM. The proposed fluorescence probe possessed excellent selectivity and anti-interference ability, and was successfully applied for the detection of Cr(<small>VI</small>) in real water samples with satisfactory results. This study provides a new approach for the analytical application of Cu NCs.</p>","PeriodicalId":64,"journal":{"name":"Analytical Methods","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Analytical Methods","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/ay/d4ay00956h","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Copper nanoclusters (Cu NCs) are a new fluorescent material that is often used for determining metal ions, but most sensing systems are based on the “turn-off” model. Here, a “turn-on” model of fluorescence sensing for the detection of Cr(VI) was developed based on Cu NCs@MIL-101 composites. The Cu NCs@MIL-101 composites were synthesized from a simple mixture of Cu NCs and MIL-101(Cr), in which the Cu NCs were uniformly distributed in MIL-101(Cr). Notably, the fluorescence intensity of Cu NCs@MIL-101 was significantly weakened due to the internal filtration effect (IFE) of MIL-101. When Cr(VI) was introduced, the fluorescence of Cu NCs@MIL-101 was recovered by the guest exchange process between Cr(VI) and the Cu NCs, which overcame the IFE of Cu NCs@MIL-101. Based on this, a “turn-on” fluorescence probe was successfully constructed for the quantitative detection of Cr(VI) with two linear ranges of 0.05–1 μM and 1–20 μM, and a low detection limit of 0.05 μM. The proposed fluorescence probe possessed excellent selectivity and anti-interference ability, and was successfully applied for the detection of Cr(VI) in real water samples with satisfactory results. This study provides a new approach for the analytical application of Cu NCs.