Biodecolorization of Naphthol Green B dye by Shewanella oneidensis MR-1 under anaerobic conditions

► Shewanella oneidensis MR-1 could decolorize the non-azo metal-complex dye NGB under anaerobic condition. ► Ferric citrate, nitrite, or nitrate could significantly decrease the decolorization of NGB. ► Nanomaterials were biosynthesized coupled with the degradation of NGB when thiosulfate was added. ► Addition of electron shuttle could accelerate the decolorization of NGB. ► Mtr respiratory pathway was responsible for the decolorization of NGB by S. oneidensis.