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Institution

Korea University of Science and Technology

EducationDaejeon, South Korea
About: Korea University of Science and Technology is a education organization based out in Daejeon, South Korea. It is known for research contribution in the topics: Catalysis & Graphene. The organization has 3997 authors who have published 7061 publications receiving 112575 citations. The organization is also known as: University of Science and Technology & UST.
Topics: Catalysis, Graphene, Anode, Adsorption, Thin film


Papers
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Journal ArticleDOI
TL;DR: The structure of lignin suggests that it can be a valuable source of chemicals, particularly phenolics as discussed by the authors, but it is the major challenge for converting it into value-added chemicals.
Abstract: The structure of lignin suggests that it can be a valuable source of chemicals, particularly phenolics. However, lignin depolymerization with selective bond cleavage is the major challenge for converting it into value-added chemicals. Pyrolysis (thermolysis), gasification, hydrogenolysis, chemical oxidation, and hydrolysis under supercritical conditions are the major thermochemical methods studied with regard to lignin depolymerization. Pyrolytic oil and syngases are the primary products obtained from pyrolysis and gasification. A significant amount of char is also produced during pyrolysis. Thermal treatment in a hydrogen environment seems very promising for converting lignin to liquid fuel and chemicals like phenols, while oxidation can produce phenolic aldehydes. Reaction severity, solvents, and catalysts are the factors of prime importance that control yield and composition of the product.

1,185 citations

Journal ArticleDOI
TL;DR: The number of fragmented polymer particles produced by ultraviolet exposure and mechanical abrasion increased with decreasing size in all polymer types, and the size-normalized abundance of the fragmented PE, PP, and EPS particles according to particle size after UV exposure and MA was predictable.
Abstract: It is important to understand the fragmentation processes and mechanisms of plastic litter to predict microplastic production in the marine environment. In this study, accelerated weathering experiments were performed in the laboratory, with ultraviolet (UV) exposure for up to 12 months followed by mechanical abrasion (MA) with sand for 2 months. Fragmentation of low-density polyethylene (PE), polypropylene (PP), and expanded polystyrene (EPS) was evaluated under conditions that simulated a beach environment. PE and PP were minimally fragmented by MA without photooxidation by UV (8.7 ± 2.5 and 10.7 ± 0.7 particles/pellet, respectively). The rate of fragmentation by UV exposure duration increased more for PP than PE. A 12-month UV exposure and 2-month MA of PP and PE produced 6084 ± 1061 and 20 ± 8.3 particles/pellet, respectively. EPS pellets were susceptible to MA alone (4220 ± 33 particles/pellet), while the combination of 6 months of UV exposure followed by 2 months of MA produced 12,152 ± 3276 particles/pellet. The number of fragmented polymer particles produced by UV exposure and mechanical abrasion increased with decreasing size in all polymer types. The size-normalized abundance of the fragmented PE, PP, and EPS particles according to particle size after UV exposure and MA was predictable. Up to 76.5% of the initial EPS volume was unaccounted for in the final volume of pellet produced particle fragments, indicating that a large proportion of the particles had fragmented into undetectable submicron particles.

768 citations

Journal ArticleDOI
TL;DR: This review outlines the role of these interactions in key evolutionary events such as endosymbiosis, besides their ecological role in biogeochemical cycles, and focuses on extending such studies on algal-bacterial interactions to various environmental and bio-technological applications.

730 citations

Journal ArticleDOI
TL;DR: In this article, the authors conducted a literature survey to review the current identification methods for microplastics and compared the advantages and limitations of each identification method to indicate the best methods for the microplastic analysis.
Abstract: Microplastics have become a major global environmental issue in recent decades due to their ubiquity in the oceans, bioavailability and ability to carry toxic chemicals. Analysis of microplastics in environmental and experimental samples has become increasingly common. We conducted a literature survey to review the current identification methods for microplastics. The advantages and limitations of each identification method were compared to indicate the best methods for microplastic analysis. Identification of microplastics is based on the physical and chemical characterisation of isolated particles in mixtures of inorganic and organic remnant particles after the extraction and clean-up steps. In addition, novel methods which may possibly be applied to microplastic identification were suggested. Microscopic identification by itself has a high risk of producing both false positive and false negative results in analyses of small microplastics. At present, combinations of physical (e.g., microscopy) and chemical (e.g., spectroscopy) analyses are widely used. However, there is a need to improve and develop new methods to reduce the identification time and effort and to detect sub-micron plastics in environmental samples.

563 citations

Journal ArticleDOI
TL;DR: St stereomicroscope and Fourier transform infrared spectroscope (FT-IR) identification methods for microplastics (<1mm) were compared using the same samples from the sea surface microlayer (SML) and beach sand.

548 citations


Authors

Showing all 4045 results

NameH-indexPapersCitations
Hang Lee9656538246
Bongsoo Kim8969826907
Jin-Soo Kim6626421375
Saro Lee6617513592
Hyunjoo Lee6247516302
David Parkinson6228316221
Muhammad Usman61120324848
Dae Yong Kim6146013824
Hee-Sup Shin6020211788
Myeong Soo Lee5849912553
Michael D. Albrow5838713635
Won Joon Shim5621110099
Asif Ahmed5621110856
Choong-Min Ryu5522514539
Cheolmin Park5444414181
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202331
202286
2021898
2020976
2019920
2018911