Electrospun Cyclodextrin/Poly(L-lactic acid) Nanofibers for Efficient Air Filter: Their PM and VOC Removal Efficiency and Triboelectric Outputs

In this work, PLLA and CD/PLLA nanofibers were fabricated using electrospinning and
utilized as a particulate matter (PM) and volatile organic compounds (VOCs) filter. The electrospun
PLLA and CD/PLLA were characterized with various techniques, including SEM, BET, FTIR, XRD,
XPS, WCA, DSC, tensile strength testing, PM and VOCs removal efficiency, and triboelectric performance.
The results demonstrated that the best air filter was 2.5 wt%CD/PLLA, which performed the
highest filtration efficiencies of 96.84 1.51% and 99.38 0.43% for capturing PM2.5 and PM10, respectively. Its PM2.5 removal efficiency was 16% higher than that of pure PLLA, which were contributed
by their higher surface area and porosity. These 2.5 wt%CD/PLLA nanofibers also exhibited the
highest and the fastest VOC entrapment. For triboelectric outputs, the 2.5 wt%CD/PLLA-based triboelectric
nanogenerator provided the highest electrical outputs as 245 V and 84.70 A. These give rise
to a three-fold enhancement of electrical outputs. These results indicated that the 2.5 wt%CD/PLLA
can improve surface charge density that could capture more PM via electrostatic interaction under
surrounding vibration. Therefore, this study suggested that 2.5 wt%CD/PLLA is a