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(a) Filtration mechanisms of chitosan-coated PBS fibers combined Janus membrane filter; (b) schematical fabrication process of PBS fiber mat; SEM image and its average fiber diameter and pore size of (c) microfiber mat and (d) nanofiber mat; (e) basis weight ≈ thickness of PBS microfiber and nanofiber mats; (f) PM removal efficiency of the microfiber and nanofiber mats with similar basis weights (Choi et al., 2021).
