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Light-activated nanozymes possess several advantages, such as light-mediated activity regulation, utilization of molecular oxygen as a green oxidant, and highly enhanced activity; however, the types of light-activated nanozymes are still limited. In this study, we found that Mg aminoclay-based Fe3O4/TiO2 hybrids (MgAC-Fe3O4/TiO2) exhibited peroxidase-like catalytic activity to catalyze the oxidation of the peroxidase substrate 2,2′-azino-bis(3-ethylbenzo-thiazoline-6-sulfonic acid) diammonium salt (ABTS) in the presence of H2O2, which was significantly enhanced under ultraviolet (UV)-light irradiation. Compared with MgAC-Fe3O4 and MgAC-TiO2, MgAC-Fe3O4/TiO2 showed around three-fold enhancement in the absorption intensity corresponding to the oxidized ABTS under UV-light irradiation, presumably due to the synergistic effect between Fe3O4 and TiO2, thereby facilitating photocatalytic electron transfer during the catalytic action. In addition, the MgAC-Fe3O4/TiO2 showed vivid stability enhancement in wide range of pH and temperature values compared with natural peroxidase. The UV-light-driven MgAC-Fe3O4/TiO2-based system was successfully applied for the colorimetric detection of phenolic compounds, including pyrocatechol and resorcinol, in a dynamic linear range of 0.15–1.30 mg/mL with a limit of detection as low as 0.1 mg/mL. Further, the system could successfully determine the phenolic compounds in spiked tap water, and thus, it can be used for practical applications. We believe that the UV-light-driven enhancement in the peroxidase-like catalytic performances highlights the potential of MgAC-Fe3O4/TiO2 for detecting phenolic compounds as well as other clinically and environmentally important substances.
Yoon Jung Jang; Vu Khac Hoang Bui; Phuong Thy Nguyen; Young-Chul Lee; Moon Il Kim. UV-Light-Driven Enhancement of Peroxidase-Like Activity of Mg-Aminoclay-Based Fe3O4/TiO2 Hybrids for Colorimetric Detection of Phenolic Compounds. Chemosensors 2021, 9, 219 .
AMA StyleYoon Jung Jang, Vu Khac Hoang Bui, Phuong Thy Nguyen, Young-Chul Lee, Moon Il Kim. UV-Light-Driven Enhancement of Peroxidase-Like Activity of Mg-Aminoclay-Based Fe3O4/TiO2 Hybrids for Colorimetric Detection of Phenolic Compounds. Chemosensors. 2021; 9 (8):219.
Chicago/Turabian StyleYoon Jung Jang; Vu Khac Hoang Bui; Phuong Thy Nguyen; Young-Chul Lee; Moon Il Kim. 2021. "UV-Light-Driven Enhancement of Peroxidase-Like Activity of Mg-Aminoclay-Based Fe3O4/TiO2 Hybrids for Colorimetric Detection of Phenolic Compounds." Chemosensors 9, no. 8: 219.
To enhance the performance of lithium-ion batteries, zinc oxide (ZnO) has generated interest as an anode candidate owing to its high theoretical capacity. However, because of its limitations such as its slow chemical reaction kinetics, intense capacity fading on potential cycling, and low rate capability, composite anodes of ZnO and other materials are manufactured. In this study, we introduce binary and ternary composites of ZnO with other metal oxides (MOs) and carbon-based materials. Most ZnO-based composite anodes exhibit a higher specific capacity, rate performance, and cycling stability than a single ZnO anode. The synergistic effects between ZnO and the other MOs or carbon-based materials can explain the superior electrochemical characteristics of these ZnO-based composites. This review also discusses some of their current limitations.
Vu Bui; Tuyet Pham; Jaehyun Hur; Young-Chul Lee. Review of ZnO Binary and Ternary Composite Anodes for Lithium-Ion Batteries. Nanomaterials 2021, 11, 2001 .
AMA StyleVu Bui, Tuyet Pham, Jaehyun Hur, Young-Chul Lee. Review of ZnO Binary and Ternary Composite Anodes for Lithium-Ion Batteries. Nanomaterials. 2021; 11 (8):2001.
Chicago/Turabian StyleVu Bui; Tuyet Pham; Jaehyun Hur; Young-Chul Lee. 2021. "Review of ZnO Binary and Ternary Composite Anodes for Lithium-Ion Batteries." Nanomaterials 11, no. 8: 2001.
In recent decades, harmful algal blooms (HABs) have been significantly affecting environments, aquatic ecosystems, and human health, as well as damaging economies, especially near rivers and lakes, and in coastal regions. Microcystis and Anabaena are two genera of harmful cyanobacteria that will often predominate during toxic microalgal blooms. In this study, we employ a method for control and mitigation of HABs by microalgal cell instability using different types of aminoclays (ACs). Allelopathic interactions between the two strains of algae are studied in mono-culture, co-culture, and filtrated cell-free medium in the presence of the ACs. The growth of the Anabaena strain is significantly reduced by the cyanobacterial strains in the co-culture media, and both are significantly affected by the Acs’-enhanced algicidal activity. Anabaena sp. KVSF7 shows higher sensitivity against the ACs than does Microcystis sp. KW. In this way, the algicidal activity of ACs is harnessed, the effects of which are in the order of aluminum aminoclay (AlAC) > magnesium aminoclay (MgAC) > calcium aminoclay (CaAC). The ammonium sites in the ACs carry positive charges to induce instability of HABs along with the electrostatic attraction between algal cells and AC. Therefore, the utilization of the algicidal activity of the ACs can effectively reduce HABs, especially on cyanobacterial blooms.
Minh Nguyen; Vu Bui; Chi-Yong Ahn; Hee-Mock Oh; Jin-Soo Koh; Ju-Young Moon; Young-Chul Lee. Loading Effects of Aminoclays in Co-Culture of Two Cyanobacterial Microcystis and Anabaena Species as an Algicidal Role. Applied Sciences 2021, 11, 5607 .
AMA StyleMinh Nguyen, Vu Bui, Chi-Yong Ahn, Hee-Mock Oh, Jin-Soo Koh, Ju-Young Moon, Young-Chul Lee. Loading Effects of Aminoclays in Co-Culture of Two Cyanobacterial Microcystis and Anabaena Species as an Algicidal Role. Applied Sciences. 2021; 11 (12):5607.
Chicago/Turabian StyleMinh Nguyen; Vu Bui; Chi-Yong Ahn; Hee-Mock Oh; Jin-Soo Koh; Ju-Young Moon; Young-Chul Lee. 2021. "Loading Effects of Aminoclays in Co-Culture of Two Cyanobacterial Microcystis and Anabaena Species as an Algicidal Role." Applied Sciences 11, no. 12: 5607.
The state-of-the-art development progress of the fabrication, design, modification, and applications of TiO2-B-based hierarchical nanostructures with a well-controlled size and morphology in lithium-ion battery (LIB) applications has been summarized and discussed. Based on studying on lithiation/delithiation on mechanisms of a typical metal oxide nanomaterials, along with doping with foreign atoms (metal or non-metal), using electronically conductive additives (graphene/graphene derivatives), as well as designing and using hierarchical anode-material nanostructures (hybrids/composites) containing two or more constituents in LIB applications, these strategies have provided many great opportunities to take maximum advantage of both the high capacity and rate capacity while avoiding significant capacity loss after charge/discharge cycling. In this review, the advances in TiO2-B-based anode structures at the nanoscale for LIBs have been discussed in two major sections, including (a) hierarchical heterostructures based on TiO2-B and metal, non-metal, transition metal oxides (TMOs), and transition metal dichalcogenides (TMDs); and (b) hybrid designs/nanocomposites between TiO2-B and graphene/graphene derivatives. The in-depth understanding of structure-property relationships as well as detailed suggestions on the mechanism, reason, and origin of the excellent enhancement in electrochemical performance in the above strategies, has been presented and highlighted.
Tuyet Nhung Pham; Vu Khac Hoang Bui; Young‐Chul Lee. Recent advances in hierarchical anode designs of TiO 2 ‐B nanostructures for lithium‐ion batteries. International Journal of Energy Research 2021, 1 .
AMA StyleTuyet Nhung Pham, Vu Khac Hoang Bui, Young‐Chul Lee. Recent advances in hierarchical anode designs of TiO 2 ‐B nanostructures for lithium‐ion batteries. International Journal of Energy Research. 2021; ():1.
Chicago/Turabian StyleTuyet Nhung Pham; Vu Khac Hoang Bui; Young‐Chul Lee. 2021. "Recent advances in hierarchical anode designs of TiO 2 ‐B nanostructures for lithium‐ion batteries." International Journal of Energy Research , no. : 1.
Many studies have found that the concentration of fine particulates in the atmosphere has increased. In particular, when using the bus, the situation in which people are exposed to relatively high concentrations of fine particulates is increasing. The purpose of this study is to reduce exposure to these potentially harmful particulates by introducing open shelters at outdoor bus stops. In order to use it as an outdoor fine particulates reduction device, a brush filter using electrostatic force (EF) was used on an experimental scale and the generation of electrostatic force, according to the material, was examined. As electrostatic force was generated, the fine particulates collection performance was about 90% efficiency. In addition, it was confirmed that the efficiency of each particle size was improved by 57% through structural improvement. Finally, through experimentation, it was confirmed that the brush module can be used for about 70 days.
Jaeseok Heo; Yelim Jang; Michael Versoza; Gihwan Kim; Duckshin Park. A New Method of Removing Fine Particulates Using an Electrostatic Force. International Journal of Environmental Research and Public Health 2021, 18, 6199 .
AMA StyleJaeseok Heo, Yelim Jang, Michael Versoza, Gihwan Kim, Duckshin Park. A New Method of Removing Fine Particulates Using an Electrostatic Force. International Journal of Environmental Research and Public Health. 2021; 18 (12):6199.
Chicago/Turabian StyleJaeseok Heo; Yelim Jang; Michael Versoza; Gihwan Kim; Duckshin Park. 2021. "A New Method of Removing Fine Particulates Using an Electrostatic Force." International Journal of Environmental Research and Public Health 18, no. 12: 6199.
Gravel is used in railway infrastructure to reduce environmental impacts and noise, but gravel on tracks must be replaced continuously because it deforms due to wear and weathering. It is therefore necessary to review the entire railroad life cycle. In this study, an unmanned aerial vehicle (UAV) was used to measure resuspended dust over a wide area. The dust was generated from transport movements in relation to the operation of a quarry, which represents the first stage of the railway life cycle. The dust was measured at Gangwon-do quarry using a Sniffer4D module, which can provide measurements at 1 s intervals through a light scattering method and has high reliability (R2 = 0.95 for PM2.5, R2 = 0.88 for PM10). The hourly generation of fugitive dust was calculated as 2937.5 g/h for PM2.5 and 4293.2 g/h for PM10. The social cost of dust generation was calculated as KRW 36.59 billion. The amount of dust generated per hour at the quarry was ~12 times greater than that generated by the operation of a regulator as a maintenance vehicle, with the largest amount of fugitive dust generated by the washing-type vehicle. This is the first study to measure the amount of fugitive dust generated in real time at 1 s intervals by monitoring the first stage of the railroad life cycle over a wide area using a Sniffer4D module attached to a UAV. This method can be replicated for use in various studies.
Min-Kyeong Kim; Yelim Jang; Jaeseok Heo; Duckshin Park. A UAV-Based Air Quality Evaluation Method for Determining Fugitive Emissions from a Quarry during the Railroad Life Cycle. Sensors 2021, 21, 3206 .
AMA StyleMin-Kyeong Kim, Yelim Jang, Jaeseok Heo, Duckshin Park. A UAV-Based Air Quality Evaluation Method for Determining Fugitive Emissions from a Quarry during the Railroad Life Cycle. Sensors. 2021; 21 (9):3206.
Chicago/Turabian StyleMin-Kyeong Kim; Yelim Jang; Jaeseok Heo; Duckshin Park. 2021. "A UAV-Based Air Quality Evaluation Method for Determining Fugitive Emissions from a Quarry during the Railroad Life Cycle." Sensors 21, no. 9: 3206.
Resuspension of particulate matter (PM) in classrooms, which increases the risk of negative impact on student health from exposure to PM, is influenced by humidity level in the indoor environment. The goal of this study is to investigate the properties of PM resuspension in accordance with relative humidity through classroom test chamber experiments. In actual classrooms, it is challenging to control factors influencing resuspension. Therefore, the classroom chamber that reflects the environment of elementary school classroom (e.g., structure, floor material) is used in this study. The humidity of the classroom chamber is adjusted to 35%, 55%, 75%, and 85% by placing it inside a real-size environmental chamber, which allows artificial control of climatic conditions. At the respective humidity conditions, PM resuspension concentration and resuspension factor caused by occupant walking across the classroom chamber are analyzed. The results show that both of the resuspension concentration and resuspension factor reveal a linear negative correlation to humidity increase. Furthermore, coefficient of determination (R2) indicating goodness-of-fit of the linear regression model between the resuspension concentration and humidity is 0.88 for PM10 and 0.93 for PM2.5. It implies that accuracy of the regression model for estimating PM10 and PM2.5 resuspension concentrations is 88% and 93%, respectively.
Sunghee Cho; Gahye Lee; Duckshin Park; Minjeong Kim. Study on Characteristics of Particulate Matter Resuspension in School Classroom through Experiments Using a Simulation Chamber: Influence of Humidity. International Journal of Environmental Research and Public Health 2021, 18, 2856 .
AMA StyleSunghee Cho, Gahye Lee, Duckshin Park, Minjeong Kim. Study on Characteristics of Particulate Matter Resuspension in School Classroom through Experiments Using a Simulation Chamber: Influence of Humidity. International Journal of Environmental Research and Public Health. 2021; 18 (6):2856.
Chicago/Turabian StyleSunghee Cho; Gahye Lee; Duckshin Park; Minjeong Kim. 2021. "Study on Characteristics of Particulate Matter Resuspension in School Classroom through Experiments Using a Simulation Chamber: Influence of Humidity." International Journal of Environmental Research and Public Health 18, no. 6: 2856.
Although photocatalytic materials have been under extensive investigation for several decades, attempts to improve the current well-studied photocatalysts and develop novel photocatalysts for indoor air purification are still ongoing. The present work examines the progress made over the past three years in the application of photocatalysts for degrading gas-phase air pollutants. Three main issues are considered: (1) the basic principles of using photocatalytic degradation for air purification are briefly elucidated, including mass transfer, photocatalytic reaction mechanisms, degradation pathways, and strategies to enhance the photocatalytic efficiency; (2) novel photocatalytic systems with improved photocatalytic performance for the removal of air pollutants are discussed, focusing on state-of-the-art photocatalysts; and (3) future trends in the development of photocatalytic materials for commercialization are considered.
Vu Khac Hoang Bui; Thanh Ngoc Nguyen; Vinh Van Tran; Jaehyun Hur; Il Tae Kim; Duckshin Park; Young-Chul Lee. Photocatalytic materials for indoor air purification systems: An updated mini-review. Environmental Technology & Innovation 2021, 22, 101471 .
AMA StyleVu Khac Hoang Bui, Thanh Ngoc Nguyen, Vinh Van Tran, Jaehyun Hur, Il Tae Kim, Duckshin Park, Young-Chul Lee. Photocatalytic materials for indoor air purification systems: An updated mini-review. Environmental Technology & Innovation. 2021; 22 ():101471.
Chicago/Turabian StyleVu Khac Hoang Bui; Thanh Ngoc Nguyen; Vinh Van Tran; Jaehyun Hur; Il Tae Kim; Duckshin Park; Young-Chul Lee. 2021. "Photocatalytic materials for indoor air purification systems: An updated mini-review." Environmental Technology & Innovation 22, no. : 101471.
The aim of this study was to evaluate the growth-promoting effects of the combination of magnesium aminoclay (MgAC) and amino-functionalized carbon dots (N(CD)s) on Tetraselmis sp. cultures with an emphasis on N(CD)s. To that end, simply sol-gel-synthesized MgAC and one-pot carbonization-synthesized N(CD)s were utilized. The as-prepared N(CD)s possessed the expected amino-functional groups, exhibited strong blue emission with bright luminescence, and showed a quantum yield (QY) of 5.69%. The maximum specific growth rate and biomass productivity were achieved with the combination of 0.1 g L−1 MgAC and 40 μg mL−1 N(CD)s, which afforded improvements in lipid and protein accumulation relative to the control, whereas carbohydrate accumulation slightly decreased. At low concentrations (0.1 g L−1), MgAC demonstrated growth stimulation. The N(CD) addition to the MgAC-containing medium further supported the Tetraselmis sp. cultures in counteracting the effects of UV radiation and in improving photosynthesis activity. In these ways, increased growth and biomass productivity under UV irradiation and enhanced pigment contents under the light-irradiance condition were obtained. Therefore, use of the MgAC-N(CD) combination as a culture-medium supplement is a promising method for microalgae biorefinery applications.
Minh Kim Nguyen; Mi-Kyung Kim; Ju-Young Moon; Vinh Van Tran; Young-Chul Lee. Influence of chitosan-based carbon dots added in MgAC-containing culture medium on green alga Tetraselmis sp. Environmental Biology of Fishes 2021, 33, 765 -775.
AMA StyleMinh Kim Nguyen, Mi-Kyung Kim, Ju-Young Moon, Vinh Van Tran, Young-Chul Lee. Influence of chitosan-based carbon dots added in MgAC-containing culture medium on green alga Tetraselmis sp. Environmental Biology of Fishes. 2021; 33 (2):765-775.
Chicago/Turabian StyleMinh Kim Nguyen; Mi-Kyung Kim; Ju-Young Moon; Vinh Van Tran; Young-Chul Lee. 2021. "Influence of chitosan-based carbon dots added in MgAC-containing culture medium on green alga Tetraselmis sp." Environmental Biology of Fishes 33, no. 2: 765-775.
The use of diesel locomotives in transport is gradually decreasing due to electrification and the introduction of high-speed electric rails. However, in Korea, up to 30% of passenger and cargo transport still relies on diesel locomotives and vehicles. Many studies have shown that the exhaust gas from diesel locomotives poses a threat to human health. This study examined the characteristics of particulate matter (PM) in diesel locomotive engine exhaust. In a previous study, PM emissions were found to increase as the throttle was moved to a higher notch. The use of a portable emission measurement system (PEMS) in this study did not detect the highest emissions at notch 5, as is commonly found in gravimetric analyses. When comparing the mass concentrations, the notch 1 and 5 results were similar. However, at notch 8, there was a large difference between the mass concentrations collected on the filters. Further, to reduce the fine PM emitted from diesel locomotives, the ionic components, which account for the largest proportion of the total materials in fine PM, should be clearly identified. Therefore, in this study, an analysis of the weight, ionic composition, and metal components of fine PM discharged from a diesel locomotive was performed. Based on the results, Na+ (31%), Ca2+ (27%), NO3− (24%), and SO42− (13%), were the main ionic components, and the most abundant metal components being Ca (45%) and S (20%). In this study, the chemical components generated in diesel engines of other sources were compared, and as a result, different results were shown depending on the engine load and material ingredients. For the first time, a PEMS was used to measure PM from diesel vehicles, and a comparison was made with the results obtained by a gravimetric method. This is the first report of measuring PM concentrations by connecting a PEMS to a diesel locomotive, and of the distribution and characteristics of ions and heavy metals contained in the particles collected in the filter analyzed. The results indicate the importance of identifying the characteristics of fine PM emitted from a diesel locomotive and establishing an effective reduction measurement.
Min-Kyeong Kim; Duckshin Park; Minjeong Kim; Jaeseok Heo; Sechan Park; Hwansoo Chong. The Characteristics and Distribution of Chemical Components in Particulate Matter Emissions from Diesel Locomotives. Atmosphere 2021, 12, 70 .
AMA StyleMin-Kyeong Kim, Duckshin Park, Minjeong Kim, Jaeseok Heo, Sechan Park, Hwansoo Chong. The Characteristics and Distribution of Chemical Components in Particulate Matter Emissions from Diesel Locomotives. Atmosphere. 2021; 12 (1):70.
Chicago/Turabian StyleMin-Kyeong Kim; Duckshin Park; Minjeong Kim; Jaeseok Heo; Sechan Park; Hwansoo Chong. 2021. "The Characteristics and Distribution of Chemical Components in Particulate Matter Emissions from Diesel Locomotives." Atmosphere 12, no. 1: 70.
In Korea, concentrations of particulate matter (PM10) are significantly higher in urban railway tunnels (178.1 μg/m3) than in metropolitan areas (49 μg/m3). In railway tunnels in Korea, it was maintained at 3–4 times higher concentration than general atmosphere and platform. Dust generated by trains is scattered at high speed in these tunnels, making filtration difficult; therefore, the development of filters that can be maintained in tunnels is required. In the present study, we examined PM adsorption in the laboratory scale using activated carbon fiber (ACF), which has high adsorption and capacity. The ACF depth, velocity of flow, and fine PM concentration in the tunnel were the experimental variables. We compared PM concentrations before and after the filter experiments, and calculated removal efficiency to determine the optimal conditions. Comprehensive examination of the experimental variables and differential pressure showed that the optimal conditions for an ACF specimen were a wind speed of 3.0 m/s and the ACF depth of 400 mm. The average removal efficiency of PM10 was 55.5%, and that of PM2.5 was 36.6%. The reproducibility tests showed that the ACF filter could be washed and reused and is suitable for various places because it is easily maintained.
Min-Kyeong Kim; Yelim Jang; Duckshin Park. Determination of the Optimum Removal Efficiency of Fine Particulate Matter Using Activated Carbon Fiber (ACF). International Journal of Environmental Research and Public Health 2020, 17, 8230 .
AMA StyleMin-Kyeong Kim, Yelim Jang, Duckshin Park. Determination of the Optimum Removal Efficiency of Fine Particulate Matter Using Activated Carbon Fiber (ACF). International Journal of Environmental Research and Public Health. 2020; 17 (21):8230.
Chicago/Turabian StyleMin-Kyeong Kim; Yelim Jang; Duckshin Park. 2020. "Determination of the Optimum Removal Efficiency of Fine Particulate Matter Using Activated Carbon Fiber (ACF)." International Journal of Environmental Research and Public Health 17, no. 21: 8230.
Photobiomodulation Therapy (PBMT) is a novel modality using irradiation with light-power-intensity light. Recently, applications of PBMT have been broadened to thousands of people around the world for various medical conditions and dermatological conditions. Normally, light sources used in PBMT are non-coherent light (Light Emitting Diodes-LED) or coherent light (lasers). LED-light-source-based devices offer several advantages compared with laser devices, including ease of home use, simultaneous irradiation of a large area of tissue, availability for wearable devices, much lower price, and enhanced safety. Thus, various LED-based devices for dermatological and cosmetics applications have been designed and developed and sold on the global market. However, LED therapy still confronts many challenges that limit its applications and cause human-health concerns. Herein, we provide a critical review of the various applications of LED therapy in the fields of dermatology and beauty: skin rejuvenation, acne treatment, scarring prevention, hair restoration, fat reduction and cellulite treatment, and tooth whitening. Also, the challenges to the development of LED therapy and its action mechanisms are identified and discussed in detail. Additionally, future perspectives for development of LED light phototherapy are pointed.
Vinh Van Tran; Minhe Chae; Ju-Young Moon; Young-Chul Lee. Light emitting diodes technology-based photobiomodulation therapy (PBMT) for dermatology and aesthetics: Recent applications, challenges, and perspectives. Optics & Laser Technology 2020, 135, 106698 .
AMA StyleVinh Van Tran, Minhe Chae, Ju-Young Moon, Young-Chul Lee. Light emitting diodes technology-based photobiomodulation therapy (PBMT) for dermatology and aesthetics: Recent applications, challenges, and perspectives. Optics & Laser Technology. 2020; 135 ():106698.
Chicago/Turabian StyleVinh Van Tran; Minhe Chae; Ju-Young Moon; Young-Chul Lee. 2020. "Light emitting diodes technology-based photobiomodulation therapy (PBMT) for dermatology and aesthetics: Recent applications, challenges, and perspectives." Optics & Laser Technology 135, no. : 106698.
Normal heating, ventilation, and air conditioning (HVAC) systems typically use high-efficiency particulate air (HEPA) filters, which can filter dust, various pollutants, and even bacteria and viruses from indoor air. However, since HEPA filters cannot not clean themselves and due to the nature of these microbes which can survive for long periods of time, changing these filters improperly could transmit pathogenic bacteria or viruses, and could even lead to new infections. This study indicated that these manufactured Solid Oxygen-purifying (SOP) filters have the potential to self-disinfect, filter, and inactivate aerosolized viruses. MS2 bacteriophage was used as a model virus in two different experiments. The first experiment involved aerosolization of the virus, while the second were a higher viral load using a soaking method. The SOP filters inactivated up to 99.8% of the virus particles in both experiments, provided that the density of the SOP filter was high. Thus, SOP filters could self-clean, which led to protection against airborne and aerosolized viruses by inactivating them on contact. Furthermore, SOP filters could be potentially use or addition in HVAC systems and face masks to prevent the transmission of airborne and aerosolized viruses.
Michael Versoza; Jaeseok Heo; Sangwon Ko; Minjeong Kim; Duckshin Park. Solid Oxygen-Purifying (SOP) Filters: A Self-Disinfecting Filters to Inactivate Aerosolized Viruses. International Journal of Environmental Research and Public Health 2020, 17, 7858 .
AMA StyleMichael Versoza, Jaeseok Heo, Sangwon Ko, Minjeong Kim, Duckshin Park. Solid Oxygen-Purifying (SOP) Filters: A Self-Disinfecting Filters to Inactivate Aerosolized Viruses. International Journal of Environmental Research and Public Health. 2020; 17 (21):7858.
Chicago/Turabian StyleMichael Versoza; Jaeseok Heo; Sangwon Ko; Minjeong Kim; Duckshin Park. 2020. "Solid Oxygen-Purifying (SOP) Filters: A Self-Disinfecting Filters to Inactivate Aerosolized Viruses." International Journal of Environmental Research and Public Health 17, no. 21: 7858.
A tin-aminoclay/reduced graphene oxide (SnO2-SnAC/rGO) electrode with significantly enhanced electrochemical performance was successfully fabricated by a facile two-step method entailing microwave treatment (1st step) and heat treatment (2nd step) synthesis processes. In step 1, the complete reduction of GO to rGO by microwave ensures the removal of most oxygen-containing functional groups on the material surface leading to improvement of its electrical conductivity along with the formation of SnO2 dots of 3–4 nm diameter. In step 2, the tin crystals are formed more stably in the SnAC/rGO framework by the heat-treatment process under Argon (Ar) gas via the direct conversion process of Sn2+ active sites within the SnAC structure. With this two-step process, the synthesized material possesses many unique synergistic effects, all leading to beneficial features (i.e., improved specific capacity, high rate capability, and long cycle life stability compared with SnO2-SnAC and pure rGO electrodes) for application to battery electrodes. Especially, SnO2-SnAC/rGO-500 °C (1:1) exhibits outstanding performance in terms of cyclic performance (650 mAh g−1 after 100 cycles at 100 mA g−1) and rate capability.
Tuyet Nhung Pham; Jaewook Ko; Vu Khac Hoang Bui; Seongjoon So; Hyun Uk Lee; Jaehyun Hur; Young-Chul Lee. Facile two-step synthesis of innovative anode design from tin-aminoclay (SnAC) and rGO for Li-ion batteries. Applied Surface Science 2020, 532, 147435 .
AMA StyleTuyet Nhung Pham, Jaewook Ko, Vu Khac Hoang Bui, Seongjoon So, Hyun Uk Lee, Jaehyun Hur, Young-Chul Lee. Facile two-step synthesis of innovative anode design from tin-aminoclay (SnAC) and rGO for Li-ion batteries. Applied Surface Science. 2020; 532 ():147435.
Chicago/Turabian StyleTuyet Nhung Pham; Jaewook Ko; Vu Khac Hoang Bui; Seongjoon So; Hyun Uk Lee; Jaehyun Hur; Young-Chul Lee. 2020. "Facile two-step synthesis of innovative anode design from tin-aminoclay (SnAC) and rGO for Li-ion batteries." Applied Surface Science 532, no. : 147435.
Titanium dioxide nanoparticles (TiO2 NPs) have some limitations, such as their low surface area, high bandgap energy, and low recycling ability. To overcome these limitations, TiO2 can be prepared in microscale/macroscale structures. TiO2 microscale structures, in comparison with TiO2 nanopowder, have higher surface areas, more tunable pore structures, and better top photocatalytic activity. In contrast, for TiO2 macroscale structures, although the surface area is lower than TiO2 nanopowder in many cases, they still achieve similar or better photocatalytic performance due to their unique properties. Moreover, both TiO2 microscale and macroscale structures can be easily recovered from reaction media. The difference between these two types of TiO2 structures is a function not only of size but also of the preparation process. Every type of TiO2 structure has its own advantages and disadvantages, as will be discussed further in the following pages. Future perspectives on this research field also will be discussed.
Vu Khac Hoang Bui; Vinh Van Tran; Ju-Young Moon; Duckshin Park; Young-Chul Lee. Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review. Nanomaterials 2020, 10, 1190 .
AMA StyleVu Khac Hoang Bui, Vinh Van Tran, Ju-Young Moon, Duckshin Park, Young-Chul Lee. Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review. Nanomaterials. 2020; 10 (6):1190.
Chicago/Turabian StyleVu Khac Hoang Bui; Vinh Van Tran; Ju-Young Moon; Duckshin Park; Young-Chul Lee. 2020. "Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review." Nanomaterials 10, no. 6: 1190.
In this study, we evaluated the low-doses loading effects of magnesium aminoclay (MgAC) on Microcystis sp. KW cultures. In the presence of MgAC at concentrations ranging from 0.01 to 0.1 g/L, the cell growth of Microcystis sp. KW was enhanced relative to a non-MgAC case. At these low concentrations, MgAC also showed the capability of improving microalgal metabolite accumulation. Additionally, the amount of MgAC remaining in the culture media could be reused in the re-cultivation process just by adding a minimal amount of additional MgAC. And in fact, after reuse, the microalgal cultures maintained their growth efficiency. Therefore, integrated MgAC-aided microalgae cultivation is herein recommended as a promisingly efficient method for microalgae biorefinery applications.
Minh Kim Nguyen; Ju-Young Moon; Young-Chul Lee. Loading effects of low doses of magnesium aminoclay on microalgal Microcystis sp. KW growth, macromolecule productions, and cell harvesting. Biomass and Bioenergy 2020, 139, 105619 .
AMA StyleMinh Kim Nguyen, Ju-Young Moon, Young-Chul Lee. Loading effects of low doses of magnesium aminoclay on microalgal Microcystis sp. KW growth, macromolecule productions, and cell harvesting. Biomass and Bioenergy. 2020; 139 ():105619.
Chicago/Turabian StyleMinh Kim Nguyen; Ju-Young Moon; Young-Chul Lee. 2020. "Loading effects of low doses of magnesium aminoclay on microalgal Microcystis sp. KW growth, macromolecule productions, and cell harvesting." Biomass and Bioenergy 139, no. : 105619.
Nowadays, nanotechnology and its related industries are becoming a rapidly explosive industry that offers many benefits to human life. However, along with the increased production and use of nanoparticles (NPs), their presence in the environment creates a high risk of increasing toxic effects on aquatic organisms. Therefore, a large number of studies focusing on the toxicity of these NPs to the aquatic organisms are carried out which used algal species as a common biological model. In this review, the influences of the physio-chemical properties of NPs and the response mechanisms of the algae on the toxicity of the NPs were discussed focusing on the “assay” studies. Besides, the specific algal toxicities of each type of NPs along with the NP-induced changes in algal cells of these NPs are also assessed. Almost all commonly-used NPs exhibit algal toxicity. Although the algae have similarities in the symptoms under NP exposure, the sensitivity and variability of each algae species to the inherent properties of each NPs are quite different. They depend strongly on the concentration, size, characteristics of NPs, and biochemical nature of algae. Through the assessment, the review identifies several gaps that need to be further studied to make an explicit understanding. The findings in the majority of studies are mostly in laboratory conditions and there are still uncertainties and contradictory/inconsistent results about the behavioral effects of NPs under field conditions. Besides, there remains unsureness about NP-uptake pathways of microalgae. Finally, the toxicity mechanisms of NPs need to be thoughtfully understood which is essential in risk assessment.
Minh Kim Nguyen; Ju-Young Moon; Young-Chul Lee. Microalgal ecotoxicity of nanoparticles: An updated review. Ecotoxicology and Environmental Safety 2020, 201, 110781 .
AMA StyleMinh Kim Nguyen, Ju-Young Moon, Young-Chul Lee. Microalgal ecotoxicity of nanoparticles: An updated review. Ecotoxicology and Environmental Safety. 2020; 201 ():110781.
Chicago/Turabian StyleMinh Kim Nguyen; Ju-Young Moon; Young-Chul Lee. 2020. "Microalgal ecotoxicity of nanoparticles: An updated review." Ecotoxicology and Environmental Safety 201, no. : 110781.
Use of diesel locomotives in transport is gradually decreasing due to electrification and the introduction of high-speed electric rail. However, in Korea, up to 30% of the transportation of passengers and cargo still uses diesel locomotives and diesel vehicles. Many studies have shown that exhaust gas from diesel locomotives poses a threat to human health. This study examined the characteristics of particulate matter (PM), nitrogen oxides (NOx), carbon monoxide (CO), and hydrocarbons in diesel locomotive engine exhaust. Emission concentrations were evaluated and compared with the existing regulations. In the case of PM and NOx, emission concentrations increased as engine output increased. High concentrations of CO were detected at engine start and acceleration, while hydrocarbons showed weakly increased concentrations regardless of engine power. Based on fuel consumption and engine power, the emission patterns of PM and gaseous substances observed in this study were slightly higher than the U.S. Environmental Protection Agency Tier standard and the Korean emission standard. Continuous monitoring and management of emissions from diesel locomotives are required to comply with emission standards. The findings of this study revealed that emission factors varied based on fuel consumption, engine power, and actual driving patterns. For the first time, a portable emission measurement system (PEMS), normally used to measure exhaust gas from diesel vehicles, was used to measure exhaust gas from diesel locomotives, and the data acquired were compared with previous results. This study is meaningful as the first example of measuring the exhaust gas concentration by connecting a PEMS to a diesel locomotive, and in the future, a study to measure driving characteristics and exhaust gas using a PEMS should be conducted.
Min-Kyeong Kim; Duckshin Park; Minjeong Kim; Jaeseok Heo; Sechan Park; Hwansoo Chong. A Study on Characteristic Emission Factors of Exhaust Gas from Diesel Locomotives. International Journal of Environmental Research and Public Health 2020, 17, 3788 .
AMA StyleMin-Kyeong Kim, Duckshin Park, Minjeong Kim, Jaeseok Heo, Sechan Park, Hwansoo Chong. A Study on Characteristic Emission Factors of Exhaust Gas from Diesel Locomotives. International Journal of Environmental Research and Public Health. 2020; 17 (11):3788.
Chicago/Turabian StyleMin-Kyeong Kim; Duckshin Park; Minjeong Kim; Jaeseok Heo; Sechan Park; Hwansoo Chong. 2020. "A Study on Characteristic Emission Factors of Exhaust Gas from Diesel Locomotives." International Journal of Environmental Research and Public Health 17, no. 11: 3788.
Indoor air pollution (IAP) is a serious threat to human health, causing millions of deaths each year. A plethora of pollutants can result in IAP; therefore, it is very important to identify their main sources and concentrations and to devise strategies for the control and enhancement of indoor air quality (IAQ). Herein, we provide a critical review and evaluation of the major sources of major pollutant emissions, their health effects, and issues related to IAP-based illnesses, including sick building syndrome (SBS) and building-related illness (BRI). In addition, the strategies and approaches for control and reduction of pollutant concentrations are pointed out, and the recent trends in efforts to resolve and improve IAQ, with their respective advantages and potentials, are summarized. It is predicted that the development of novel materials for sensors, IAQ-monitoring systems, and smart homes is a promising strategy for control and enhancement of IAQ in the future.
Vinh Van Tran; Duckshin Park; Young-Chul Lee. Indoor Air Pollution, Related Human Diseases, and Recent Trends in the Control and Improvement of Indoor Air Quality. International Journal of Environmental Research and Public Health 2020, 17, 2927 .
AMA StyleVinh Van Tran, Duckshin Park, Young-Chul Lee. Indoor Air Pollution, Related Human Diseases, and Recent Trends in the Control and Improvement of Indoor Air Quality. International Journal of Environmental Research and Public Health. 2020; 17 (8):2927.
Chicago/Turabian StyleVinh Van Tran; Duckshin Park; Young-Chul Lee. 2020. "Indoor Air Pollution, Related Human Diseases, and Recent Trends in the Control and Improvement of Indoor Air Quality." International Journal of Environmental Research and Public Health 17, no. 8: 2927.
Particulate matter (PM) is one of the most important factors causing serious skin diseases, due to its generation of reactive oxygen species (ROS) over the course of long-term exposure. As a source of natural antioxidants, Opuntia humifusa (O. humifusa) is a potential candidate for the design of advanced formulations to prevent PM’s harmful effects. Unfortunately, its high viscosity does not allow it to be utilized in these formulations. In this present study, a new approach to the extract of O. humifusa using high-power microwave treatment, namely microwave-assisted O. humifusa extract (MA-OHE), was investigated. The results indicated that MA-OHE not only is a reasonable viscosity extract, but also enhances O. humifusa’s antioxidant properties. Additionally, this study also found that MA-OHE exhibited outstanding antioxidant and anti-inflammatory activities in eliminating PM’s effects, due to suppression of AhR degradation, ROS production, and COX-2 and MMP-9 expression in HaCaT keratinocytes. It is believed that MA-OHE is a potential cosmeceutical ingredient that could be utilized to prevent PM-induced skin oxidative stress and inflammation.
Ju-Young Moon; Le Thi Nhu Ngoc; Minhe Chae; Vinh Van Tran; Young-Chul Lee. Effects of Microwave-Assisted Opuntia humifusa Extract in Inhibiting the Impacts of Particulate Matter on Human Keratinocyte Skin Cell. Antioxidants 2020, 9, 271 .
AMA StyleJu-Young Moon, Le Thi Nhu Ngoc, Minhe Chae, Vinh Van Tran, Young-Chul Lee. Effects of Microwave-Assisted Opuntia humifusa Extract in Inhibiting the Impacts of Particulate Matter on Human Keratinocyte Skin Cell. Antioxidants. 2020; 9 (4):271.
Chicago/Turabian StyleJu-Young Moon; Le Thi Nhu Ngoc; Minhe Chae; Vinh Van Tran; Young-Chul Lee. 2020. "Effects of Microwave-Assisted Opuntia humifusa Extract in Inhibiting the Impacts of Particulate Matter on Human Keratinocyte Skin Cell." Antioxidants 9, no. 4: 271.