Fluorescent "on–off–on" sensor based on N, S co-doped carbon dots from seaweed (Sargassum carpophyllum) for specific detection of Cr(vi) and ascorbic acid. Issue 57 (5th November 2021)

• Record Type: Journal Article
• Authors: Tian, Hua; Ju, Guangxu; Li, Mengting; Fu, Wenzhe; Dai, Yongcheng; Liang, Zhenyi; Qiu, Yuheng; Qin, Ziyu; Yin, Xueqiong
• Is Part Of: RSC advances. Volume 11:Issue 57(2021)
• Page Start: 35946
• Page End: 35953
• Publication Date: 2021-11-05
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra06544k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A low-temperature carbonization method using seaweed ( Sargassum carpophyllum ) as a precursor was applied to prepare nitrogen and sulfur co-doped CDs (N, S-CDs). Abstract : A low-temperature carbonization method using seaweed ( Sargassum carpophyllum ) as a precursor was applied to prepare nitrogen and sulfur co-doped CDs (N, S-CDs). The N, S-CDs exhibited satisfactory stability, water solubility and photostability. The N, S-CDs-based "on–off" fluorescent sensor showed high selectivity and good response to Cr(vi ), whose limit of detection (LOD) was as low as 1.04 μM. The recoveries of Cr(vi ) in tap water and sea water were 88.90–116.38% (RSD < 5%), proving that it could be a practical sensor for detecting Cr(vi ). In addition, the established N, S-CDs/Cr(vi ) system was developed as an "off–on" fluorescent sensor to detect ascorbic acid (AA). It could precisely detect AA in vitamin C chewable tablets, with recoveries from 96.02 to 103.95% (RSD < 5%). Moreover, the N, S-CDs expressed low toxicity by CCK8 assay. In this work, an "on–off–on" fluorescent sensor was prepared from seaweed, which can act as a reference for enabled high-value transformation of seaweeds. Furthermore, it also provided a facile fluorescent sensor for the detection of Cr(vi ) and AA. The fluorescent sensor expressed high potential in water quality monitoring and nutritional food quality control.