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229 results on '"Lee, Ji Yi"'

23. Influence of Relative Humidity and Composition on PM2.5 Phases in Northeast Asia

Author

Seong, Changjoon, primary, Kim, Daeun, additional, Jeong, Rani, additional, Qiu, Yanting, additional, Wu, Zhijun, additional, Lee, Ji Yi, additional, Lee, Kwangyul, additional, Ahn, Joonyoung, additional, Jang, Kyoung-Soon, additional, Zuend, Andreas, additional, Kim, Changhyuk, additional, Natsagdorj, Amgalan, additional, and Song, Mijung, additional

Published
2024
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26. Removal of bisphenol A via adsorption on graphene/(reduced) graphene oxide-based nanomaterials.

Author

Nam, Seong-Nam, Jun, Byung-Moon, Park, Chang Min, Jang, Min, Cho, Kyung-Suk, Lee, Ji Yi, Park, Chanhyuk, Snyder, Shane A., Son, Ahjeong, and Yoon, Yeomin

Subjects
BISPHENOL A, NANOSTRUCTURED materials, LITERATURE reviews, WATER purification, GRAPHENE
Abstract

Recently, emerging nanoadsorbents, such as graphene/(reduced) graphene oxide (GO)-based nanomaterials, have been prepared and used in different environmental applications, particularly water purification. This study is a review of the research progress on adsorption mechanisms for bisphenol A removal, which is significantly influenced by the physicochemical properties of various graphene/(reduced) GO-based nanomaterials and water quality conditions. In addition, this study presents the beneficial knowledge for the application of these nanomaterials for water purification. Results on the removal of bisphenol A and several other comparable contaminants using various graphene/(reduced) GO-based nanoadsorbents suggest that their removal can vary significantly depending on the properties of compounds or adsorbents and water chemistry conditions. Therefore, the bisphenol A adsorption performance of these nanomaterials is discussed: (i) to evaluate the overall adsorption capacities of various graphene/(reduced) GO-based nanomaterials based on the properties of nanomaterials and comparable contaminants; (ii) to summarize the influences of main water quality factors, such as pH, temperature, background ions/alkalinity, and natural organic matter or other organics, on adsorption; (iii) to discuss the key mechanisms that affect adsorption on these nanomaterials; and (iv) to describe the possible desorption and reusability of these carbon-based nanomaterials. [ABSTRACT FROM AUTHOR]

Published
2024
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41. Determination of twelve synthetic musk compounds in estuary and coastal areas near Han River of Korea by improved liquid–liquid extraction coupled with GC/MS.

Author

Jo, Jungmin, Lee, Ji Yi, Lee, Ha Eun, Son, Young Gyu, Yoo, Jae Won, Ahn, Dong-Sik, and Ahn, Yun Gyong

Subjects
*LIQUID-liquid extraction, *SOLVENT extraction, *ESTUARIES, *GAS chromatography, *MASS spectrometry, *GAS well drilling
Abstract

Conventional liquid–liquid extraction coupled with gas chromatography/mass spectrometry (GC/MS) was improved for the determination of twelve synthetic musk compounds (SMs) in water samples by consideration of pH and organic solvents for extraction. Samples collected from eleven different points of the Han River estuary and a coastal area were analysed, and the overall concentration of SMs downstream of the Han River was higher than of the coastal area. The extraction efficiencies were above 74% for the twelve SMs from three different classes when using the optimum pH and extraction with dichloromethane (DCM). Results for method detection limit (MDL), method quantification limit (MQL)and recovery obtained by the established analytical method showed that it is adequate for the determination of SMs in real samples. Among the SMs, Galaxolide (HHCB) and Iso E Super (OTNE) had the highest concentrations and detection frequencies. By using the established analytical method, our study showed regional and seasonal distribution of SMs originated from the Han River in estuary and coastal areas. [ABSTRACT FROM AUTHOR]

Published
2023
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48. Ocean-atmosphere interactions: Different organic components across Pacific and Southern Oceans

Author

Government of South Korea, Agencia Estatal de Investigación (España), Jang, Jiyi, Park, Jiyeon, Park, Jongkwan, Yoon, Young Jun, Dall'Osto, Manuel, Park, Ki-Tae, Jang, Eunho, Lee, Ji Yi, Hwa Cho, Kyung, Lee, Bang Yong, Government of South Korea, Agencia Estatal de Investigación (España), Jang, Jiyi, Park, Jiyeon, Park, Jongkwan, Yoon, Young Jun, Dall'Osto, Manuel, Park, Ki-Tae, Jang, Eunho, Lee, Ji Yi, Hwa Cho, Kyung, and Lee, Bang Yong

Abstract

Sea spray aerosol (SSA) particles strongly influence clouds and climate but the potential impact of ocean microbiota on SSA fluxes is still a matter of active research. Here–by means of in situ ship-borne measurements–we explore simultaneously molecular-level chemical properties of organic matter (OM) in oceans, sea ice, and the ambient PM2.5 aerosols along a transect of 15,000 km from the western Pacific Ocean (36°13′N) to the Southern Ocean (75°15′S). By means of orbitrap mass spectrometry and optical characteristics, lignin-like material (24 ± 5 %) and humic material (57 ± 8 %) were found to dominate the pelagic Pacific Ocean surface, while intermediate conditions were observed in the Pacific-Southern Ocean waters. In the marine atmosphere, we found a gradient of features in the aerosol: lignin-like material (31 ± 9 %) dominating coastal areas and the pelagic Pacific Ocean, whereas lipid-like (23 ± 16 %) and protein-like (11 ± 10 %) OM controlled the sympagic Southern Ocean (sea ice-influence). The results of this study showed that the OM composition in the ocean, which changes with latitude, affects the OM in aerosol compositions in the atmosphere. This study highlights the importance of the global-scale OM monitoring of the close interaction between the ocean, sea ice, and the atmosphere. Sympagic primary marine aerosols in polar regions must be treated differently from other pelagic-type oceans

Published
2023

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