Stereocomplex Crystallite-Based Eco-Friendly Nanofiber
Membranes for Removal of Cr(VI) and Antibacterial Effects
Posted on 2019-09-06 - 21:14
Poly(lactic
acid) (PLA) stereocomplex crystallite (SC)-based electrospun
nanofibers were fabricated via annealing the as-spun membranes at
100 °C for 1 h. The heat-treated nanofibers exhibit enhanced
mechanical properties and thermal resistance due to the existence
of SCs, which restricts the lactide chain mobility. The formation
of SCs increases the intermolecular forces between l-lactide
and d-lactide segments, resulting in almost 2 times higher
tensile strength (8.52 ± 0.29 MPa) and 3 times higher Young’s
modulus (285.48 ± 1.19 MPa) than that of the untreated membranes,
which is benefitting for wider applications. Additionally, a green
absorbent named HTA synthesized from tannic acid and hexamethylenediamine
was introduced into the nanofibers, giving the membrane richer functions.
Based on the abundant reactive functional groups on the surface, small
pore size and large surface area-to-volume ratio of the nanofibers,
the HTA containing membranes exhibited excellent performance in adsorbing
heavy metal ions and inhibiting bacterial growth. This bifunctional
membrane showed reusability for 4 cycles with retaining good removal
capability of Cr(VI) and antibacterial effects. Furthermore, Cr(VI)
was found to be adsorbed and converted to less toxic Cr(III) during
the adsorption process, and bacteria, such as Escherichia
coli and Staphylococcus aureus, were captured and broken on the surface of the nanofibers. In this
study, we focused on a novel eco-friendly bifunctional SC-based PLA
nanofiber to repeatedly adsorb metal ions and capture bacteria, and
thus it is expected to have potential in various fields in the future.
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Ren, Yangmei; Mei, Lan; Gu, Yingchun; Zhao, Na; Wang, Yuelong; Fan, Rangrang; et al. (2019). Stereocomplex Crystallite-Based Eco-Friendly Nanofiber
Membranes for Removal of Cr(VI) and Antibacterial Effects. ACS Publications. Collection. https://doi.org/10.1021/acssuschemeng.9b02828