Random coil silk fibroin membrane was designed to dissolve with HFIP, and regenerated silk fibroin fibers were obtained by wet spinning. The effect of coagulants (methanol and ethanol) on structure, mechanical properties, and actinomyces biodegradability of regenerated silk fibroin fiber was investigated through X-ray diffraction, IR spectra, and TGA. The results showed that the effect on the structure and properties of regenerated silk fibroin fibers coagulated by methanol and ethanol was negligible, but the difference in actinomyces biodegradability in vitro was obvious.

Solvent evaporation is used for fabrication of nanoporous fibers by electrospinning, where multiple solvents are used. Pore size and distribution can be controlled by the fractions of the spun solution. An experiment was carefully designed, where polysulfone and poly(lactic acid) were dissolved in a binary solvent of dichloromethane and dimethylacetamide, to reveal the controllable process for fabrication of nanoporous fibers.

The study of oil sorbents with high oil sorption capacity is of great significance for oil-water separation, especially for oil spillage on seawater. In this work, we report polysulfone, poly(lactic acid), and polysulfone/poly(lactic acid) nanoporous fibrous mats prepared by one-step electrospinning process used as oil sorbents for oil-water separation. The morphology, porous structure, oleophilicity and hydrophobicity, oil sorption capacity, and oil retention of these nanoporous fibrous mats are investigated in detail. It is noticeable that the motor oil and linseed oil sorption capacity of polysulfone and polysulfone/poly(lactic acid) fibrous mats have little difference, but the motor oil sorption capacity (147.8 g g À1 ) of polysulfone is approximately 2.95 times as much as that (50.1 g g À1 ) of poly(lactic acid). The linseed oil sorption capacity (131.3 g g À1 ) is approximately 3.74 times than that (34.6 g g À1 ) of poly(lactic acid). Besides, they all exhibit quick oil sorption speed and high buoyancy. It is suggested that polysulfone and polysulfone/poly(lactic acid) nanoporous fibrous mats have a better oil sorption capacity than poly(lactic acid)