Ternary Fe2O3–MoS2–Cu2O nanocomposites were
fabricated via electrodeposition and
hydrothermal method. The as-prepared photocatalytic films were characterized
by scanning electron microscopy (SEM), X-ray diffraction (XRD), and
X-ray photoelectron spectroscopy (XPS). The results indicated that
MoS2 and Cu2O particles were successfully deposited
onto the surface of Fe2O3 particles. MoS2 and Cu2O coloading achieved a synergetic effect
on the improvement of the photoelectrochemical performance of Fe2O3 film. The highest photocurrent density was achieved
on Fe2O3–MoS2–Cu2O film, which was 20, ∼5.5, and 2 times those of Fe2O3, Fe2O3–MoS2, and Fe2O3–Cu2O films,
respectively. The excellent photoelectrocatalytic performance was
attributed to the Z-scheme electron transfer mechanism, which results
in the fast charge transfer and strong redox ability on the ternary
composite. This work provides a promising Z-scheme ternary semiconductor
for environmental purification and water oxidation.
Poly(L-lactic) acid (PLLA) scaffolds, prepared by electrospinning technology, have been suggested for use in tissue engineering. They remain a challenge for application in biological fields due to PLLA's slow degradation and hydrophobic nature. We describe PLLA, PLLA/poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV), and PLLA/PHBV/gelatin (Gt) composite nanofiberous scaffolds (Gt-PLLA/PHBV) electrospun by changing the electrospinning technology. The morphologies and hydrophilicity of these fibers were characterized by scanning electron microscopy (SEM) and water contact angle measurement. The results showed that the addition of PHBV and Gt resulted in a decrease in the diameters and their distribution and greatly improved the hydrophilicity. The in-vitro degradation test indicated that GT-PLLA/PHBV composite scaffolds exhibited a faster degradation rate than PLLA and PLLA/PHBV scaffolds. Dermal fibroblasts viabilities on nanofibrous scaffolds were characterized by [3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide] (MTT) assay and cell morphologies after 7 days culture. Results indicated that the GT-PLLA/PHBV composite nanofibers showed the highest bioactivity among the three scaffolds and increased with increasing time. The SEM images of cells/scaffolds composite materials showed the GT-PLLA/PHBV composite nanofibers enhanced the dermal fibroblasts's adhesion, proliferation, and spreading. It is suggested that the nanofibrous composite scaffolds of GT-PLLA/PHBV composites would be a promising candidate for tissue engineering scaffolds.
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