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Metal–organic frameworks for NH3 adsorption by different NH3 operating pressures
배천웅,구민규,전유리,김덕종,김주영 대한화학회 2023 Bulletin of the Korean Chemical Society Vol.44 No.2
NH3 has been used in wide applications, such as fertilizers, hydrogen sources,and working fluids, where proper NH3 adsorbents are required to minimize human health risks in daily NH3 exposure as well as to achieve energy efficiency in energy conversion systems. As NH3 operating pressure differs from each usage, the structure and properties of the NH3 adsorbent need to be optimized in each NH3 operating pressure. Metal–organic frameworks (MOFs) have emerged as promising NH3 adsorbents, which would be customizable for different NH3 pressures due to great structural tunability. We introduce up-to-date reports with MOFs as NH3 adsorbents and classify them by the NH3 pressure,from high in adsorption heat pumps to extremely low in daily life sensing. MOFs with high NH3 adsorption capacity and durability are suggested in different NH3 pressure ranges, and their structural factors are discussed to help design high-performance MOFs for NH3 adsorption in different NH3 pressures.
김태국 ( Kim Tae-kook ),김남춘 ( Kim Nam-choon ),김은범 ( Kim Eun-bum ),구민규 ( Koo Min-kyu ) 한국환경복원기술학회(구 한국환경복원녹화기술학회) 2018 한국환경복원기술학회지 Vol.21 No.4
This research was thereby made to study and analysis ecological, landscape, and stability qualities of roadside cut Slopes in expressways and national highways that went through revegetation works. Also, evaluation items and framework for integrated assessment of plant structure and restored state for the maintenance were suggested. Following is the summary of the result. firstly, for stabilization of introduced native plant species on roadside cut slops, assessment on the post-project environmental management through long-term monitoring and maintenance works must be made. It signifies a form of authentic recovery and restoration by the native plants. second, current evaluation framework on the test beds is well managed with clear evaluation standards and table while its method of assessing the post management with only test bed results lacks conformity with this study site. Newly developed evaluation framework on the post construction sites is estimated to be used as assessment standards on any roadside construction sites. Third, after site investigation distinction was observed among different revegetating construction types in the long-term perspective. Due to the different duration time of vegetation state between seed-spray measures(degraded in time) and layer-spray measure(maintained), the use of coarse straw-mat mulching work or Coir net was suggested in long term maintenance of cut slopes. forth, segmentation of post environmental assessment is organized into three large categories of “ecological”, “stabile”, and “landscape” qualities regarding post restoration quality and stability of slope through native plants with which categories marks 50, 30, 20 points of rates. fifth, components of the post environmental assessment were segmented in twelve categories driving results from former experimental construction and newly focused items on site. In the future, it is possible to propose a customized assessment method considering the location and location of construction work if the research on the application of post-environment assessment methods for road construction surface recording is conducted systematically.
하이브리드 금속-유기 골격체의 암모니아 흡탈착 특성 연구
배정원(Cheongwon Bae),정규영(Gyuyeong Jeong),박수현(Suhyeon Park),김예람(Yeram Kim),구민규(Mingyu Gu),김덕종(Duckjong Kim),김주영(Juyeong Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
An adsorption heat pump has recently emerged as energy-efficient heating and cooling system. The amount of adsorbed working fluids is an important factor at low-grade temperatures to utilize waste heat and thermal energy storage. Metal-organic frameworks(MOFs) are regarded as promising adsorbents due to their large specific surface area, tunable pore size, and pore chemical properties. However, there have been few reports that investigated ammonia uptake performance with MOFs and their nanocomposite at high ammonia pressures in low working temperatures. Herein, we developed a hybrid nanocomposite with a MOF and reduced graphene oxide(rGO) composite through a one-pot hydrothermal reaction. Its ammonia adsorption capacity was evaluated under high ammonia pressures, which showed that the nanocomposite with 3.7% rGO could have higher ammonia adsorption capacity than pure MOF.
하이브리드 금속-유기 골격체의 암모니아 흡탈착 특성 연구
배정원(Cheongwon Bae),정규영(Gyuyeong Jeong),박수현(Suhyeon Park),김예람(Yeram Kim),구민규(Mingyu Gu),김덕종(Duckjong Kim),김주영(Juyeong Kim) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
An adsorption heat pump has recently emerged as energy-efficient heating and cooling system. The amount of adsorbed working fluids is an important factor at low-grade temperatures to utilize waste heat and thermal energy storage. Metal-organic frameworks(MOFs) are regarded as promising adsorbents due to their large specific surface area, tunable pore size, and pore chemical properties. However, there have been few reports that investigated ammonia uptake performance with MOFs and their nanocomposite at high ammonia pressures in low working temperatures. Herein, we developed a hybrid nanocomposite with a MOF and reduced graphene oxide(rGO) composite through a one-pot hydrothermal reaction. Its ammonia adsorption capacity was evaluated under high ammonia pressures, which showed that the nanocomposite with 3.7% rGO could have higher ammonia adsorption capacity than pure MOF.