Oxidation activity modulation of a single atom Ce-N-C nanozyme enabling a time-resolved sensor to detect Fe3+ and Cr6+. Issue 41 (7th October 2022)

• Record Type: Journal Article
• Authors: Song, Guangchun; Zhang, Qi; Liang, Shuang; Yao, Ying; Feng, Menglin; Majid, Zainabu; He, Xiaoyun; Huang, Kunlun; Li, Jin-Cheng; Cheng, Nan
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 41(2022)
• Page Start: 15656
• Page End: 15663
• Publication Date: 2022-10-07
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc02476d
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A time-resolved sensor based on single atom Ce-N-C nanozyme oxidase-like catalytic activity to detect Fe 3+ and Cr 6+ simultaneously. Abstract : The rapid, efficient, and low-cost detection of heavy metal ions using sensors has attracted widespread interest from researchers due to the health risks posed by heavy metal pollution. In recent years, single atom nanozymes with uniformly dispersed active centers and precisely designed coordination structures have been developed and used for the rational construction of various sensors. However, there is a lack of technology available to detect heavy metal ions using the catalytic activity of nanozymes. In this study, we investigated the oxidase-like (OXD-like) catalytic activity of the single atom Ce-N-C (SACe-N-C) prepared in our previous studies. Notably, we found that both Fe 3+ and Cr 6+ could significantly enhance the electron conversion rates of Ce 3+ and Ce 4+ within the SACe-N-C nanozyme, which contributed to the OXD-like activity of the nanozyme. Therefore, we constructed a time-resolved sensor to detect Fe 3+ and Cr 6+ using the oxidative activity of the SACe-N-C nanozyme. The LOD for Fe 3+ was 34.72 ng mL −1 in the linear range of 0.25–1.5 μg mL −1, and the recoveries were in the range of 88.66–113.24%. The LOD for Cr 6+ was 93.65 ng mL −1 in the linear range of 0.5–5 μg mL −1, and the recoveries were in the range of 85.49–111.22%. The sensor could rapidly detect Fe 3+ and Cr 6+ at 30 s and 60 s, respectively. This study provides a promising time-resolved strategy for the rapid detection of Fe 3+ and Cr 6+ in food using the OXD-like catalytic properties of the SACe-N-C nanozyme.