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리그닌 나노입자의 첨가가 전기방사된 PVA 나노섬유의 물리화학적 특성에미치는 영향
방준식,정승오,윤희철,진형준,곽효원 한국고분자학회 2023 폴리머 Vol.47 No.6
Among lignocelluloses, a component of wood, lignin is currently in the limelight as a green additive for imparting various functions such as reinforcing the mechanical strength of general-purpose plastics, antioxidation, and UV protection. In this study, lignin nanoparticles (LNPs) with a size of 100-200 nm were prepared using a gamma-valero-lactone-based solvent system. The prepared LNPs were added to poly vinyl alcohol (PVA), and PVA nanofibers incor-porated into the LNPs were successfully prepared through electrospinning. The tensile strength of the PVA/LNPs nanofibers was improved by up to 338% as LNPs were added, and the morphology of the nanofibers was stably main-tained without melting even when heat was applied at 200 ℃, which is above the melting point of the matrix polymer. In addition, the added LNPs effectively prevented the degradation of PVA nanofibers by UV exposure. These results sug-gest that LNPs can be used as natural polymer additives that can provide effects such as thermal and mechanical stability and photolysis resistance to PVA nanofibers.
Cationized Lignin Loaded Alginate Beads for Efficient Cr(VI) Removal
김정규,김윤진,정승오,윤희철,여환명,최인규,곽효원 한국목재공학회 2023 목재공학 Vol.51 No.5
In this study, lignin, a lignocellulosic biomass, was chemically modified to produce polyethyleneimine-grafted lignin (PKL) with maximum hexavalent chromium [Cr(VI)] adsorption capacity. Changes in the physicochemical properties due to the cationization of lignin were confirmed through elemental analysis, Fourier transform infrared spectroscopy, and moisture stability evaluation. Alginate (Alg) beads containing PKL (Alg/PKL) were prepared by incorporating cationic lignin into the Alg matrix to apply the prepared PKL in a batch-type water treatment process. The optimal Alg/lignin mixing ratio was selected to increase the Cr(VI) adsorption capacity and minimize lignin elution from the aqueous system. The selected Alg/PKL beads exhibited an excellent Cr(VI) removal capacity of 478.98 mg/g. Isothermal adsorption and thermodynamic analysis revealed that the Cr(VI) removal behavior of the Alg/PKL beads was similar to that of heterogeneous chemical adsorption. In addition, the bulk adsorbent material in the form of beads exhibited adsorption behavior in three stages: surface adsorption, diffusion, and equilibrium.