This study investigates the piezo-photocatalytic degradation of ciprofloxacin using BiFeO₃/C nano composites. The composites were fabricated using a solvothermal route, incorporating carbon quantum dots (CQDs) to enhance visible light absorption and active site availability. The piezoelectric properties of the composites were also evaluated, showing excellent piezoelectric response and weak ferromagnetism. The BiFeO₃/C-0.12 composite exhibited the highest degradation efficiency (k-value of 0.0835 min⁻¹) in piezo-photocatalysis, attributed to its efficient charge separation and reduced recombination of photoinduced electron-hole pairs. The study also explored the influence of CQD content, catalyst concentration, initial ciprofloxacin concentration, and ultrasonic frequency on the degradation efficiency. The results highlight the potential of these composites for environmental pollution control and sustainable energy utilization.This study investigates the piezo-photocatalytic degradation of ciprofloxacin using BiFeO₃/C nano composites. The composites were fabricated using a solvothermal route, incorporating carbon quantum dots (CQDs) to enhance visible light absorption and active site availability. The piezoelectric properties of the composites were also evaluated, showing excellent piezoelectric response and weak ferromagnetism. The BiFeO₃/C-0.12 composite exhibited the highest degradation efficiency (k-value of 0.0835 min⁻¹) in piezo-photocatalysis, attributed to its efficient charge separation and reduced recombination of photoinduced electron-hole pairs. The study also explored the influence of CQD content, catalyst concentration, initial ciprofloxacin concentration, and ultrasonic frequency on the degradation efficiency. The results highlight the potential of these composites for environmental pollution control and sustainable energy utilization.