Hierarchical Porous Poly(L-lactic acid)/SiO2 Nanoparticles Fibrous Membranes for Oil/Water Separation

Zihan Lu, Qasim Zia, Jinmin Meng, Ting Liu, Jun Song, Zhiying Xin, Xiangli Zhong, Hugh Gong, Jiashen Li

Research output: Contribution to journalArticlepeer-review


A two-step strategy has been developed to introduce silica nanoparticles into highly porous poly(L-lactic acid) (PLLA) nanofibers. Silica nanoparticles (SiNPs) were firstly synthesized and then modified to be hydrophobic. After PLLA/SiNPs composite fibrous membranes were electrospun and collected, they were re-crystalized by acetone at room temperature for a few minutes. With the re-arrangement of PLLA chains, the nano/micro electrospun fibres were transformed from nonporous ones to be porous ones with high surface area. Consequently, SiNPs that were completely covered by PLLA before acetone treatment showed up at the fibre surface. Higher PLLA crystallization also enhanced the Young’s modulus and tensile strength (420 & 8.47 MPa) of the composite membrane. However, incorporation of SiNPs into porous PLLA membranes reduced their modulus and tensile strength (280.66 & 5.92 MPa) but an increase in strain to fracture (80.82 %) was observed. Scanning electron microscopy (SEM), focused ion beam SEM, transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction were applied to confirm the presence of SiNP in PLLA fibres. The presence of SiNPs inside and outside fibres enhance the hydrophobicity of PLLA/SiNPs nano fibrous membrane as the water contact angle is greater than 150º. The oil absorption of these porous composite membranes was also tested using four different oils, which can reach the highest absorption capacity when the weight ratio of PLLA and SiNPs is 1:1. The flux of prepared membranes was investigated, and results indicated that SiNPs-loaded membrane effectively enhanced the flux (5200 Lm-2h-1).
Original languageEnglish
Pages (from-to)16096-16110
Number of pages15
JournalJournal of Materials Science
Issue number34
Publication statusPublished - 2 Sept 2020


  • poly(L-lactic) acid
  • modified silica nanoparticles
  • surface modification
  • porous structure
  • flux


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