Fe-doping green fluorescent carbon dots via co-electrolysis of chrysoidine G and potassium ferrocyanide for sensitive Cr(VI) detection

Tiantian Long; Hongmei Luo; Hongchen Li; Jingbo Sun; Yang Wang; Jiaquan Zhou; Yi Chen; Dong Xu

doi:10.1016/j.saa.2024.124010

Fe-doping green fluorescent carbon dots via co-electrolysis of chrysoidine G and potassium ferrocyanide for sensitive Cr(VI) detection

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Apr 15:311:124010. doi: 10.1016/j.saa.2024.124010. Epub 2024 Feb 6.

Authors

Tiantian Long¹, Hongmei Luo², Hongchen Li², Jingbo Sun², Yang Wang³, Jiaquan Zhou³, Yi Chen⁴, Dong Xu⁵

Affiliations

¹ National Engineering Laboratory for Rice and By-products Further Processing, College of Food Science and Engineering, Central South University of Forestry & Technology, Changsha, 410004, China; College of Food Science and Engineering, Xinjiang Institute of Technology, Aksu, 843100, China.
² National Engineering Laboratory for Rice and By-products Further Processing, College of Food Science and Engineering, Central South University of Forestry & Technology, Changsha, 410004, China.
³ Department of Urology, Hainan General Hospital (Hainan Affiliated Hospital of Hainan Medical University), Haikou, Hainan 570000, China.
⁴ Hunan Intellijoy Biotechnology Co., Ltd., Changsha, Hunan 410125, China.
⁵ National Engineering Laboratory for Rice and By-products Further Processing, College of Food Science and Engineering, Central South University of Forestry & Technology, Changsha, 410004, China. Electronic address: philip198349@gmail.com.

PMID: 38340446
DOI: 10.1016/j.saa.2024.124010

Abstract

In this study, we aimed to synthesis of Fe-doping green fluorescent carbon dots (G-CDs) through the co-electrolysis of chrysoidine G and potassium ferrocyanide for Cr(VI) detection. The use of potassium ferrocyanide improves the quantum yield and sensing performance of G-CDs toward Cr(VI). The G-CDs have a maximum excitation wavelength of 308 nm and an emission wavelength of 510 nm. Comprehensive analyses including Raman, FT-IR, and XPS provided insights into the chemical structure and composition of the G-CDs. Under optimal conditions, G-CDs demonstrated concentration-dependent quenching upon interaction with Cr(VI). A linear relationship within the range of 0.25-100 µM was established with a calibration equation of ΔF/F0 = 0.005 + 0.015C_Cr(VI), yielding an R² value of 0.996 and a limit of detection of 0.15 μM. The applicability of the G-CDs method was demonstrated by successful Cr(VI) detection in water samples with recovery rates ranging from 98.8 % to 100.1 % and relative standard deviation within 3.0 %. The fluorescence lifetime and Zeta potential measurements confirmed that the mechanism was via a static quenching process, while redox reaction, nanoparticle aggregation, and surface charge variation also played significant roles.

Keywords: Carbon dots; Chromium (VI); Co-electrolysis; Green fluorescence; Quenching.