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Groundwater contamination and natural attenuation capacity at a petroleum spilled facility in Korea

Journal of Environmental Sciences 2011年第10期23卷 1650-1659页

作者： Hyun-Mi Choi jin-yong lee Department of Geology Kangwon National University

As a remedial option, the natural attenuation capacity of a petroleum contaminated groundwater at a military facility was examined. Hydrogeological conditions, such as high water level, permeable uppermost layer and frequent heavy rainfall, were favorable to natural attenuation at this site. The changes in the concentrations of electron acceptors and donors, as well as the relevant hydrochemical conditions, indicated the occurrence of aerobic respiration, denitrification, iron reduction, manganese reduction and sulfate reduction. The calculated BTEX expressed biodegradation capacity ranged between 20.52 and 33.67 mg/L, which appeared effective for the reduction of the contaminants levels. The contribution of each electron accepting process to the total biodegradation was in the order： denitrification 〉 iron reduction 〉 sulfate reduction 〉 aerobic respiration 〉 manganese reduction. The BTEX and benzene point attenuation rates were 0.0058-0.0064 and 0.0005-0.0032 day-1, respectively, and the remediation time was 0.7-1.2 and 2.5-30 years, respectively. The BTEX and benzene bulk attenuation rates were 8.69 × 10^-4 and 1.05 × 10^-3 day-l, respectively, and the remediation times for BTEX and benzene were 7.2 and 17.5 years, respectively. However, most of the natural attenuation occurring in this site can be attributed to dilution and dispersion. Consequently, the biodegradation and natural attenuation capacities were good enough to lower the contaminants levels, but their rates appeared to be insufficient to reach the remediation goal within a reasonable time frame. Therefore, some active remedial measures would be required.

关键词： petroleum contaminated site BTEX electron acceptor expressed biodegradation capacity natural attenuation

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Recent Progress and Regulation Strategies of Layered Materials as Cathode of Aqueous Zinc-Ion Batteries

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Energy & Environmental Materials 2024年第3期7卷 14-31页

作者： Yuan Yuan Si Wu Xiaoxue Song jin yong lee Baotao Kang School of Chemistry and Chemical Engineering University of JinanJinan 250022China Department of Chemistry Sungkyunkwan UniversitySuwon 16419Korea Shandong Hi-Speed Engineering Test Co. Ltd.Jinan 250022China

Aqueous zinc-ion batteries(ZIBs)have shown great potential in the fields of wearable devices,consumer electronics,and electric vehicles due to their high level of safety,low cost,and multiple electron *** layered cathode materials of ZIBs hold a stable structure during charge and discharge reactions owing to the ultrafast and straightforward(de)intercalation-type storage mechanism of Zn^(2+)ions in their tunable interlayer spacing and their abilities to accommodate other guest ions or ***,the challenges of inadequate energy density,dissolution of active materials,uncontrollable byproducts,increased internal pressure,and a large de-solvation penalty have been deemed an obstacle to the development of *** this review,recent strategies on the structure regulation of layered materials for aqueous zinc-ion energy storage devices are systematically ***,critical science challenges and future outlooks are proposed to guide and promote the development of advanced cathode materials for ZIBs.

关键词： layered cathode materials modifying strategies structure regulation zinc-ion batteries

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Theoretical elucidation of rare earth extraction and separation by diglycolamides from crystal structures and DFT simulations

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Journal of Rare Earths 2021年第7期39卷 858-865,I0004页

作者： Xiujing Peng Jianhui Su Hao Li Yu Cui jin yong lee Guoxin Sun Institute for Smart Materials&Engineering School of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China Department of Chemistry Sungkyunkwan UniversitySuwon 16419Republic of Korea

Diglycolamides(DGAs) show excellent application prospects for the extraction and separation of rare earth metals from highly radioactive liquid wastes and rare earth *** extraction ability of DGAs for rare earth ions in nitrate or chloride media increases with increasing atomic number of the rare earth *** understand the origin of this phenomenon,three binuclear crystals [Ln(TEDGA)_(3)][Ln(NO_(3))_(6)] of N,N,N’,N’-tetraethyldiglycolamide(TEDGA) with rare earth ions La(Ⅲ),Pr(Ⅲ) and Eu(III) were prepared and characterized *** three complexes belong to the triclinic crystal system,P-1 space *** bond lengths of Ln-O_(amide) are significantly shorter than those of Ln-O_(ether) in the same *** Ln-O_(amide) and Ln-O_(enher) bond lengths gradually decrease with increasing atomic number of the rare earth *** dihedral angle formed by TEDGA and metal ions through the tridentate coordination gradually increases with increasing metal ion atomic number,tending toward the formation of sizeable planar coordination structures for the most massive rare earth *** structures of the compounds formed by the extractant and metal ion were optimized by means of DFT *** find that the interaction between TEDGA and the rare earth ion is dominated by electrostatic interaction by analyzing binding energy,WBIs,Mulliken charge,natural electron configurations,and molecular orbital *** covalent component of the Ln-O bonds of the complexes increases with increasing metal atomic *** observed increase in extraction and separation capacity of diglycolamides for rare earth ions with increasing atomic number might be due to the formation of two fivemember rings by one tridentate *** rare earth ions with large atomic numbers tend to form planar structures with large dihedral angles with DGA ligands.

关键词： Diglycolamide Extraction Separation Rare earth Crystal structures DFT simulations

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Re nanoclusters anchored on nanosheet supports: Formation of Re-O-matrix bonding and evaluation as all-pH-range hydrogen evolution reaction (HER) electrocatalysts

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Journal of Energy Chemistry 2022年第6期31卷 185-193,I0006页

作者： Shiyu Xu Hao Li Jeongbok lee N.Clament Sagaya Selvam Baotao Kang jin yong lee Pil J.Yoo School of Chemical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Chemistry Sungkyunkwan UniversitySuwon 16419Republic of Korea

Although the water splitting-based generation of hydrogen as an energy carrier can help to mitigate the global problems of energy shortage and climate change,the practical implementation of this strategy is hindered by the absence of inexpensive high-performance electrocatalysts for the hydrogen evolution reaction (HER).Re-based HER electrocatalysts exhibit predictable high performance within the entire pH range but suffer from arduous formation (i.e.,vulnerability to oxidation) and uncontrollable aggregation,which strongly discourages the maximisation of active site exposure required for activity *** overcome these limitations,we herein hydrothermally synthesise Re nanoclusters uniformly distributed on nanosheet supports,such as reduced graphene oxide nanosheets (Re NCs@rGO),revealing that this hybrid features abundant exposed active sites and high oxidation *** obtained electrocatalysts were elaborately characterized by microscopic and spectroscopic ***,density functional theory calculations confirm the optimised synthesis of Re NCs@rGO and indicate the crucial role of Re–O–C junction formation in securing *** effective suppression of Re nanocluster detachment/dissolution under HER conditions endows Re NCs@rGO with high electron conductivity and electrochemical stability,resulting in a durability superior to that of commercial Pt/C and an activity similar to that of this *** a result,Re NCs@rGO exhibited remarkably small HER overpotentials of 110,130,and 93 m V to deliver a current density of 10 mA cm^(-2) in 0.5 M H_(2)SO_(4),1 M PBS,and 1 M KOH,***,Re NCs@rGO is a promising alternative to conventional Pt-group-metal catalysts and should find applications in next-generation high-performance water splitting systems.

关键词： Hydrogen evolution reaction(HER) Hydrothermal synthesis Re nanoclusters Nanosheet supports Electrocatalysts

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Is atmospheric pathway a significant contributor to microplastics in the marine environment?

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Emerging Contaminants 2024年第2期10卷 26-32页

作者： Nazima Habibi Saif Uddin Montaha Behbehani jin-yong lee Environment and Life Sciences Research Center Kuwait Institute for Scientific ResearchKuwait Department of Geology Kangwon National UniversityChuncheon24341Republic of Korea

Transmission of microplastics(MPs)through aerosolization has been recently realized as an important *** of the reports of the ubiquitous MP presence in aerosols,the spatio-temporal information is inadequate and has very limited practicality in assessing if aerosol can be a significant source of MPs to the marine *** on marine contribution to atmospheric MPs is exceptionally scarce,and the ocean-air exchange is considered an emerging research *** of MPs entering the oceans via atmospheric deposition has been recently *** idea of ocean-air exchange emanates from the fact that beach sediments can get suspended under sand and dust storms,bubble bursts and sea sprays due to wind and waves in surf zones can lead to the ejection of particles into *** this succinct review,we have tried compiling the data on atmospheric MPs that can shed some light on the flux from and to the aquatic *** the information is too limited never the less its incorporation into the marine MP cycle cannot be neglected.

关键词： Marine-atmospheric flux Aerosols Microplastics MP load MP inventories

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Sol-gel synthesis and characterization of hydroxyapatite nanorods

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Particuology 2009年第6期7卷 466-470页

作者： Sanosh Kunjalukkal Padmanabhan Avinash Balakrishnan Min-Cheol Chu yong jin lee Taik Nam Kim Seong-Jai Cho Department of Information and Electronic Materials Engineering College of EngineeringPaichai UniversityDaejeon 302-735Republic of Korea Division of Metrology for Emerging Technology Korea Research Institute of Standards and Science1 Doryong-DongYuseong-GuDaejeon 305-340Republic of Korea Division of Advanced Technology Korea Research Institute of Standards and ScienceDaejeon 305-340Republic of Korea

In the present study hydroxyapatite （HA） nano-hexagonal rods with 70-90 nm diameter and 400-500 nm length are synthesized using a simple sol-gel route with calcium nitrate and potassium dihydrogenphosphate as calcium and phosphorus precursors respectively. Deionized water was used as a diluting media for HA sol preparation and ammonia was used to adjust the pH = 9. After aging, the HA gel was dried at 60 ℃ and calcined at different temperatures ranging from 300 to 700 ℃. The dried and calcined powders were characterized for phase composition using X-ray diffractrometry, elemental dispersive X-ray and Fourier transform infrared spectroscopy. Rietveld analysis showed the calcined HA powders of high purity with a hexagonal unit cell structure. Calcination yielded HA nanopowders of increased particle size and crystallinity with increase in temperature. The particle size and morphology was studied using transmission electron microscopy. The aspect ratio （length to diameter ratio） of HA nanorods was measured to be between 6 and 7.

关键词： Hydroxyapatite Nanorods Sol-gel Particle size Morphology

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Peripheral nerve regeneration with cotransplantation of umbilical cord mesenchymal stem cells and Schwann cells in rat sciatic nerve defect

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Neural Regeneration Research 2011年第7期6卷 485-493页

作者： jin-yong lee Hun-Jong Jung Mohammad S. Alrashdan Bohan Li Mi-Ae sung Sang BaeYoo Soung-Min Kim Myung-jin Kim Jeong Won Jahng Jong-Ho lee Department of Oral and Maxillofacial Surgery School of Dentistry Seoul National University Seoul Korea Department of Occupation and Environment Konkuk Postgraduate Medical School Choong-Ju Korea Department of Craniofacial Structure and Functional Biology School of Dentistry Seoul National University Seoul Korea Dental Research Institute School of Dentistry Seoul National University Seoul Korea

Previous research has demonstrated that cotransplantation of umbilical cord mesenchymal stem cells （UCMSCs） and Schwann cells （SCs） can repair spinal nerve injury, but few studies have investigated their use in peripheral nerve regeneration. In the present study, we cotransplanted UCMSCs and SCs to repair 5-mm left sciatic nerve defects in rats, and compared the effects of UCMSCs ＋ SCs transplantation with UCMSCs or SCs transplantation alone. After UCMSCs ＋ SCs transplantation, nerve conduction velocity of the left sciatic nerve and gait were both improved. Retrograde tracing analysis demonstrated that the mean count of fluorogold-labeled neurons, as well as the mean axon count and axon density, were significantly greater in the left sciatic nerve after UCMSCs ＋ SCs transplantation, compared with UCMSCs or SCs transplantation alone. Improvements in conduction velocity and increased sheath thickness in the left sciatic nerve were similar after UCMSCs transplantation and UCMSCs ＋ SCs transplantation. These findings suggest that UCMSCs transplantation can promote the repair of sciatic nerve defects to some extent, but that combined UCMSCs ＋ SCs transplantation has a significantly greater regenerative effect.

关键词： Schwann cells human umbilical cord mesenchymal stem cells peripheral nerve re-generation axotomy

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Alpha-fetoprotein-targeted reporter gene expression imaging in hepatocellular carcinoma

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World Journal of Gastroenterology 2016年第27期22卷 6127-6134页

作者： Kwang Il Kim Hye Kyung Chung Ju Hui Park yong jin lee Joo Hyun Kang Molecular Imaging Research Center Korea Institute of Radiological and Medical Sciences Korea Drug Development Platform using Radio-Isotope Korea Institute of Radiological and Medical Sciences

Hepatocellular carcinoma (HCC) is one of the most common cancers in Eastern Asia, and its incidence is increasing globally. Numerous experimental models have been developed to better our understanding of the pathogenic mechanism of HCC and to evaluate novel therapeutic approaches. Molecular imaging is a convenient and up-to-date biomedical tool that enables the visualization, characterization and quantification of biologic processes in a living subject. Molecular imaging based on reporter gene expression, in particular, can elucidate tumor-specific events or processes by acquiring images of a reporter gene’s expression driven by tumor-specific enhancers/promoters. In this review, we discuss the advantages and disadvantages of various experimental HCC mouse models and we present in vivo images of tumor-specific reporter gene expression driven by an alpha-fetoprotein (AFP) enhancer/promoter system in a mouse model of HCC. The current mouse models of HCC development are established by xenograft, carcinogen induction and genetic engineering, representing the spectrum of tumor-inducing factors and tumor locations. The imaging analysis approach of reporter genes driven by AFP enhancer/promoter is presented for these different HCC mouse models. Such molecular imaging can provide longitudinal information about carcinogenesis and tumor progression. We expect that clinical application of AFP-targeted reporter gene expression imaging systems will be useful for the detection of AFP-expressing HCC tumors and screening of increased/decreased AFP levels due to disease or drug treatment.

关键词： Alpha-fetoprotein Hepatocellular carcinoma Molecular imaging Reporter gene Tumor-specific enhancer/promoter

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Human umbilical cord blood-derived mesenchymal stem cells promote regeneration of crush-injured rat sciatic nerves

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Neural Regeneration Research 2012年第26期7卷 2018-2027页

作者： Mi-Ae Sung Hun Jong Jung Jung-Woo lee jin-yong lee Kang-Mi Pang Sang Bae Yoo Mohammad S. Alrashdan Soung-Min Kim Jeong Won Jahng Jong-Ho lee Department of Craniofacial Structure & Functional Biology School of Dentistry Seoul National University Seoul Republic of Korea Department of Occupation and Environment Postgraduate College of Medicine Konkuk University Choong-ju Republic of Korea Department of Oral & Maxillofacial Surgery School of Dentistry Seoul National University Seoul Republic of Korea Department of Dentistry Oral and Maxillofacial Surgery Ajou University School of Medicine Suwon Republic of Korea Dental Research Institute Seoul National University Seoul Republic of Korea

Several studies have demonstrated that human umbilical cord blood-derived mesenchymal stem cells can promote neural regeneration following brain injury. However, the therapeutic effects of human umbilical cord blood-derived mesenchymal stem cells in guiding peripheral nerve regeneration remain poorly understood. This study was designed to investigate the effects of human umbilical cord blood-derived mesenchymal stem cells on neural regeneration using a rat sciatic nerve crush injury model. Human umbilical cord blood-derived mesenchymal stem cells （1 ~ 106） or a PBS control were injected into the crush-injured segment of the sciatic nerve. Four weeks after cell injection, brain-derived neurotrophic factor and tyrosine kinase receptor B mRNA expression at the lesion site was increased in comparison to control. Furthermore, sciatic function index, Fluoro Gold-labeled neuron counts and axon density were also significantly increased when compared with control. Our results indicate that human umbilical cord blood-derived mesenchvmal stem cells promote the functinnal r~.RcJv^rv nf P.n I^h-inillr^4 ~r^i~tit, n^r~e

关键词： human umbilical cord blood-derived mesenchymal stem cells sciatic nerve crush injury FluoroGold stem cells peripheral nerve regeneration regeneration neural regeneration

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Electronically coupled layered double hydroxide/MXene quantum dot metallic hybrids for high-performance flexible zinc–air batteries

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InfoMat 2021年第10期3卷 1134-1144页

作者： Xiaotong Han Nannan Li Peixun Xiong Min Gyu Jung Yingbo Kang Qingyun Dou Qing Liu jin yong lee Ho Seok Park School of Chemical Engineering Sungkyunkwan University(SKKU)SuwonRepublic of Korea Department of Chemistry Institute of Basic ScienceSungkyunkwan UniversitySuwonRepublic of Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan UniversitySuwonRepublic of Korea

Precise control of the local electronic structure and properties of electrocatalysts is important for enhancing the multifunctionality and durability of electrocatalysts and for correlating the structure/chemistry with the catalytic ***,we report electronically coupled metallic hybrids of NiFe layered double hydroxide nanosheet/Ti3C2 MXene quantum dots deposited on a nitrogen-doped graphene surface(LDH/MQD/NG)for high-performance flexible Zn-air batteries(ZABs).As verified from the Mott-Schottky and Nyquist plots,as well as spectroscopic,electrochemical,and computational analyses,the electronic and chemical coupling of LDH/MQD/NG modulates the local electronic and surface structure of the active LDH to provide metallic conductivity and abundant active sites,leading to significantly improved bifunctional activity and electrocatalytic *** rechargeable ZABs with LDH/MQD/NG hybrids are superior to the previous LDH-based ZABs,demonstrating a high power density(113.8 mW cm^(-2))and excellent cycle stability(150 h at 5 mA cm^(-2)).Moreover,the corresponding quasi solid-state ZABs are completely flexible and practical,affording a high power density of 57.6 mW cm^(-2)even in the bent state,and in real-life operation of tandem cells for powering various electronic devices.

关键词： 2D quantum dots flexible battery metallic hybrids oxygen electrochemistry Zn-air battery

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