Fluorescence turn off-on detection of Co2+and enrofloxacin by N, Cl-carbon dots prepared in deep eutectic solvent and study of their photocatalytic antibacterial activity

Nitrogen, chloride doped carbon dots (N, Cl-CDs) were synthesized in deep eutectic solvent. TEM, XRD, FT-IR, XPS, EDAX, UV-Vis and fluorescence were used for characterization. Quantum yield and average size of N, Cl-CDs were 38.75 % and 2-3 nm, respectively. N, Cl-CDs fluorescence was turn off by cobalt ion and then turn on gradually after addition of enrofloxacin. Linear dynamic range and detection limit (DL) for Co2+ and enrofloxacin were (0.1-70 & mu;M and 30 nM) and (0.05-50 & mu;M and 25 nM), respectively. Enrofloxacin was detected in blood serum and water samples with the recovery of 96-103 %. Finally, Antibacterial activity of the carbon dots was also investigated.

Automated summary

Nitrogen, chloride doped carbon dots (N, Cl-CDs) were synthesized in deep eutectic solvent and characterized using various techniques. The fluorescence of N, Cl-CDs was inhibited by cobalt ion but gradually restored upon addition of enrofloxacin. The linear dynamic range and detection limits for Co2+ and enrofloxacin were determined. Enrofloxacin was successfully detected in blood serum and water samples with high recovery rates. Additionally, the antibacterial activity of the carbon dots was investigated.