Detection of Ciprofloxacin Based on BPN/TDNA Photoelectrode

Abstract

The photoelectrochemical (PEC) process has been demonstrated to exert enormous potential in the fields of analysis, and the rational design of PEC sensors are vital for practical applications. In this study, Titanium Dioxide Nanoarrays (TDNA) and black phosphorus nanosheets (BPN) were prepared, and a BPN/TDNA composite was proposed as the photoelectrochemical sensing material for the detection of ciprofloxacin (Cip). The formation and excellent optoelectronic properties of BPN/TDNA composite materials have been demonstrated through a series of characterization methods. Moreover, the measurement of PEC properties exhibited that the introduction of BPN and natural light would improve the electron migration efficiency and the separation of photogenerated electron–hole pairs, thereby displaying the synergistic effect to promote photoelectric performance. More importantly, the current density of BPN/TDNA was linearly proportional to the concentration of Cip ranging from 1.14 to 438.86 ng/mL, and the detection limit (3S/N) was 7.56 ng/mL. In addition, such a PEC sensor demonstrated long-term stability, good reproducibility, and selectivity. Finally, the real commercial sample detection was measured to confirm the possibility of practical applications. Thus, the BPN/TDNA photoelectrocatalyst provides a new method for Cip detection with high selectivity and sensitivity.