Ratiometric fluorescent detection of chromium(VI) in real samples based on dual emissive carbon dots

Yunxia Ma; Yonglei Chen; Juanjuan Liu; Yangxia Han; Sudai Ma; Xingguo Chen

doi:10.1016/j.talanta.2018.03.081

Ratiometric fluorescent detection of chromium(VI) in real samples based on dual emissive carbon dots

Talanta. 2018 Aug 1:185:249-257. doi: 10.1016/j.talanta.2018.03.081. Epub 2018 Mar 27.

Authors

Yunxia Ma¹, Yonglei Chen², Juanjuan Liu¹, Yangxia Han¹, Sudai Ma¹, Xingguo Chen³

Affiliations

¹ State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China; Department of Chemistry, Lanzhou University, Lanzhou 730000, China.
² State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China; Department of Chemistry, Lanzhou University, Lanzhou 730000, China. Electronic address: chyl@lzu.edu.cn.
³ State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China; Department of Chemistry, Lanzhou University, Lanzhou 730000, China; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou 730000, China. Electronic address: chenxg@lzu.edu.cn.

PMID: 29759197
DOI: 10.1016/j.talanta.2018.03.081

Abstract

As we know, hexavalent chromium (Cr(VI)) was usually used as an additive to improve the color fastness during the printing and dyeing process, and thus posing tremendous threat to our health and living quality. In this work, the dual emissive carbon dots (DECDs) were synthesized through hydrothermal treatment of m-aminophenol and oxalic acid. The obtained DECDs not only exhibited dual emission fluorescence peaks (430 nm, 510 nm) under the single excitation wavelength of 380 nm, but also possessed good water solubility and excellent fluorescence stability. A ratiometric fluorescent method for the determination of Cr(VI) was developed using the DECDs as a probe. Under the optimal conditions, a linear range was obtained from 2 to 300 μM with a limit of detection of 0.4 μM. Furthermore, the proposed ratiometric fluorescent method was applied to the analysis of Cr(VI) in textile, steel, industrial wastewater and chromium residue samples with satisfactory recoveries (88.4-106.8%).

Keywords: Cr(VI) detection; Dual emissive carbon dots; Ratiometric fluorescent probe; Real samples.