Research Article

Graphene Oxide/Fe3O4/Chitosan−Coated Nonwoven Polyester Fabric Extracted from Disposable Face Mask for Enhanced Efficiency of Organic Dye Adsorption

Figure 4

Effects of pH on MO adsorption onto the GFC/NWPF absorbent: (a) pH 5, (b) pH 7, and (c) pH 9 (inserted images: corresponding color of MO solutions before and after the adsorption process).