http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Synthesis and Characterization of CNT-PLGA Hybrid Nanofibers by an Electrospinning Process
권다영,김종성 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Carbon nanotubes (CNT) are gaining significant attention in various emerging fields like display technology, wearable electronics and conducting materials etc. Ours presenting is CNT incorporated into PLGA polymer matrix (CNT-PLGA) hybrid nanofibers by using electrospinning process. These CNTs were functionalized with polar functional groups such as hydroxyl (-OH) and carboxyl (-COOH) via modified Hummer’s method. After that, the modified CNTs were mixed with poly(lactic-co-glycolic) acid (PLGA) in 1:3 ration of THF:DMF as a solvents. As a result, prepared CNT-PLGA hybrid nanofibers were formed uniformly with excellent flexible properties due to formation of intermolecular hydrogen bonding between CNT and PLGA. Finally, as prepared CNT-PLGA hybrid nanofibers structural, morphological and functional characterizations have been studied thoroughly and extensively.
Nitrogen-doped ZnO for sunlight-driven photocatalysis to achieve dye degradation
권다영,김종성,이학현 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
ZnO is a well-known effective photocatalyst for water, but its practical utilization is restricted to applications that employ UV light; this is due to its high bandgap and fast recombination rate of photogenerated charge carrier. In this study, we prepared nitrogen-doped ZnO containing different mole % of nitrogen to enhance the photocatalytic activity, thereby exhibiting a broad absorption in the visible region; this can enable the utilization of a large range of the solar spectrum. The nitrogen-doped photocatalysts were prepared using the hydrothermal process, followed by calcination at 500°C. The incorporation of nitrogen into the ZnO lattices and their crystal structures were confirmed by X-ray photoelectron spectroscopy and powder X-ray diffraction. Methylene blue was photo-degenerated up to 89.1% using nitrogen-doped ZnO as compared to the 61.0% degeneration using pure ZnO. The rate of dye degradation became almost 2.3 times faster by employing 1mol% nitrogen doping on ZnO.
권다영,김종성 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Cu-doped ZnO nanoparticle composite were prepared by hydrothermal synthesis. The Cu-doped ZnO nanoparticle structure and optical properties characterizations were performed by X-ray photoelectron spectroscopy, scanning and transmission electron microscopy, UV-visible absorption, photoluminescence. The results indicated that Cu-doped ZnO nanoparticle composite was investigated by degradation, and it is demonstrated that the photocatalytic performance of this composite was signification enhanced compared with that of pure ZnO nanoparticle.
Silver-doped ZnO for photocatalytic degradation of methylene blue
권다영,김종성 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.7
Removal of organic dyes from wastewater has become an important issue because of their carcinogenic and mutagenic effects. In this study, we prepared Ag-doped ZnO (Ag_ZnO) photocatalysts containing various amounts of Ag (0.05-0.5mol%) by a hydrothermal process followed by calcination at 500 oC and evaluated the photocatalytic degradation of methylene blue (MB) under sunlight irradiation. The incorporation of Ag into the ZnO lattice and the hexagonal wurtzite structure of the prepared catalysts could be confirmed by X-ray photoelectron spectroscopy and powder Xray diffraction analysis. BET analysis shows that the pore volume and pore size was increased with doping Ag into ZnO. The photocatalytic degradation of methylene blue followed a pseudo-first-order kinetics and the rate constant for dye degradation with 0.1% mol Ag was almost three-times bigger than that with bare ZnO. Our study shows that the photocatalytic activity of ZnO toward MB degradation under sunlight can be effectively enhanced by doping with Ag.