Molecularly imprinted polymer functionalized flower-like BiOBr microspheres for photoelectrochemical sensing of chloramphenicol

• Published in: Electrochimica acta Vol. 344; p. 136161
• Main Authors: Zhang, Zheng, Zhou, Haifei, Jiang, Caiyun, Wang, Yuping
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.06.2020; Elsevier BV
• Subjects: Chloramphenicol; Chloromycetin; Flower-like BiOBr; Imprinted polymers; Microspheres; Molecularly imprinted polymers; Photoelectric effect; Photoelectric emission; Photoelectrochemical sensing; Recognition; Selectivity; Sensors; Three dimensional flow; X ray photoelectron spectroscopy; Photoelectrochemical sensing; Chloramphenicol; Molecularly imprinted polymers; Flower-like BiOBr
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2020.136161

In this study, an ultrasensitive photoelectrochemical (PEC) sensor showing a high selectivity to for chloramphenicol (CAP) was successfully constructed, based on the molecularly imprinted polymers (MIPs) functionalized photoelectrochemically active materials. The 3D flower-like BiOBr with large specific surface area was synthesized by a simple hydrothermal process and was employed as a matrix to graft the MIPs recognition element (denoted as MIPs-PEC). SEM, TEM, FTIR, XPS, XRD and UV–vis spectroscopy were used to investigate the microstructure characteristics of the as-obtained MIPs-PEC sensor. During the PEC sensing process, MIPs were prepared via a simple thermal polymerization process provided numerous recognition sites, which improved the sensor’s selectivity to CAP. The results showed that photocurrent response signal generated by photo-induced MIPs/BrOBr/ITO electrodes was proportional to the logarithm of CAP concentration over the range from 1.00 ⅹ 10−2 to 1.00 ⅹ 103 ng mL−1 with a low detection limit is 3.02 pg mL−1 (S/N = 3). MIPs-PEC sensor exhibited high selectivity and stability, low cost, and applicability to the determination of CAP in real samples. [Display omitted] •A rapid and ultrasensitive signal-off MIPs-PEC sensor developed for CAP detection.•3D flower-sphere BiOBr with large specific surface area was successfully synthesized.•The first smart integration of BiOBr with MIPs fabricating a novel PEC sensing platform.•This method has high selectivity and can be applied to thedetermination of CAP in water.