Fenton-reaction-aid selective delignification of lignocellulose by Inonotus obliquus to improve enzymatic saccharification

•Two Fenton-reaction-aid white rot fungal biotreatment was compared.•Fenton pretreatment subsequently combined with white rot fungus fermentation.•Synergism of Fe3O4 NMs Fenton-like reaction and white rot fungus concurrently.•The selective degradation and sugar yield were improved within 5-10 days.•The enhancing effect of Fenton reaction pretreatment was better than Fe3O4 NMs.