Harnessing electromagnetic induction to power nanobiohybrids for efficient degradation of organic pollutants.

Reductive bioremediation is widely applied to detoxify environmental contaminants in wastewater, yet its efficiency is often constrained by the limited availability of electron donors required to sustain microbial metabolism. Herein, we establish an electromagnetic induction-driven nanobiohybrid strategy for efficient reductive degradation of methyl orange (MO) without the addition of conventional chemical reductants or external solar irradiation. By integrating the electroactive bacterium Geobacter sulfurreducens PCA (G. s) with conductive graphite nanosheets (GNS), we constructed a nanobiohybrid system that transduced magnetic flux variations under magnetic field (MF) stimulation into bioavailable electrons, thereby creating a microbial electron supply pathway powered by magnetic energy. The G. s-GNS nanobiohybrid system maintained high MO degradation efficiency (≥ 94.9%) over three consecutive 48-h cycles under MF conditions, demonstrating robust operational stability. Mechanistic investigations revealed that electromagnetic induction significantly enhanced interfacial electron availability within the nanobiohybrid system. This enhanced electron flux, enabled by interfacial water dissociation facilitated by surface potential amplification at GNS interfaces, facilitated extracellular electron transfer and reshaped microbial carbon and energy metabolism, ultimately accelerating reductive pollutant transformation. Overall, this work establishes a physical energy-microbe coupling paradigm for regulating microbial redox processes, providing new insights into the design of energy-efficient and sustainable wastewater treatment technologies.