Highly efficient detection of ofloxacin in water by samarium oxide and β-cyclodextrin-modified laser-induced graphene electrode

• Published in: Microchemical journal 2023-03, Vol.186, p.108353, Article 108353
• Main Authors: Liu, Zeyu, Wang, Qun, Xue, Qiang, Chang, Chunwen, Wang, Rong, Liu, Yao, Xie, Haijiao
• Format: Article
• Language: English
• Subjects: Beta-cyclodextrin; Electrochemical sensor; Laser-induced graphene; Ofloxacin; Samarium oxide nanoparticles
• ISSN: 0026-265X; 1095-9149
• DOI: 10.1016/j.microc.2022.108353

OFL detection based on β-CD/Sm2O3 NPs/LIG electrochemical sensor. [Display omitted] •Sm2O3 nanoparticles and β-CD were firstly used to modified graphene electrode.•The synergistic effect of two modification compositions promoted OFL detection.•DFT calculation confirmed the enhanced adsorption energy and electron transfer.•The developed sensor obtained a very low detection limit of 0.005 μM for OFL. We developed a new electrochemical sensor that detects ofloxacin (OFL) in water by depositing β-cyclodextrin (β-CD) and samarium oxide nanoparticles (Sm2O3 NPs) onto a laser-induced graphene (LIG) electrode. Scanning electron microscopy, Transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, contact angle measurements, and electrochemical impedance spectroscopy were used to characterize β-CD/Sm2O3 NPs/LIG electrodes. Our results showed that the improved electrochemical activity is due to the excellent electrocatalytic performance of Sm2O3 NPs, improving electron transfer efficiency. The deposition of β-CD improves electrode hydrophilicity and increases the adsorption capacity of OFL on the electrode surface. The synergistic effect of two modification compositions can promote OFL detection. The enhanced adsorption energy and improved electron transfer characteristics were also confirmed by density functional theory calculations. Under optimal detection conditions, the sensor achieves a wide linear range (0.01 ∼ 1.0 μmol/L and 1.0 ∼ 120 μmol/L) and a low detection limit (0.005 μmol/L) with good anti-interference ability and stability. This sensor has also been successfully applied to the detection of OFL in tap water and lake water. These results show that the developed sensor is a promising step towards rapid in situ detection of OFL in water environments.