Microbial fuel cells for azo dye treatment with electricity generation: A review

► Porous carbon paper and Pt electrode shows maximum OCP (0.5 V) in an air cathode single chamber MFC. ► Dye degrade completely with low electricity generation in anaerobic-aerobic MFC coupled system. ► Microfiltration membrane air-cathode single-chamber MFC is not effective for electricity generation. ► MFC-Fenton system gives highest energy output (28.3 mW/cm3) and complete degradation of dye.