Enhancement on the microbial extracellular electron transfers by modified lignin materials: Application on decolorization of azo dye

In the process of biodegradation azo dye, redox mediators (RMs) were found to significantly enhance removal efficiency. this work, biodegradable RMs deriving from lignin-based monomers prepared via peroxidation investigate whether similar chemicals present in lignin-rich streams biorefineries could be used for biological treatment dyes. The as-prepared characterized by fourier transform infrared spectroscopy (FTIR), gas chromatography-mass spectrometer (GC–MS), cyclic voltammetry and electron paramagnetic resonance, degradation metabolites analyzed high performance liquid chromatography (HPLC). induction accelerated extracellular transfer, resulting efficient methyl orange (MO) decolorization. decolorization efficiency MO motivated products vanillin increased 20% 95% 12 h. Moreover, syringaldehyde 40% 85% 24 results two well fitted zero-order first-order kinetic models. Under saline condition, strain still remained a stable presence RMs, making it acceptable applied practical wastewater. transfers metabolic explored unveil mechanisms enhancement. This study provide new route functional utilization lignin-resource theoretical guidance dye