5 results on '"Jaeyoung Seo"'
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2. Synthesis, structures and reactivity of cobalt(II) complexes supported by N,N,N′,N″-tetradentate N′-substituted bis((1H-pyrazol-1-yl)methyl)amine
- Author
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Jongho Jeon, Eunhee Kim, Hyosun Lee, Jaegyeong Lee, Saira Nayab, and Jaeyoung Seo
- Subjects
Denticity ,010405 organic chemistry ,Chemistry ,Ligand ,chemistry.chemical_element ,Pyrazole ,010402 general chemistry ,01 natural sciences ,Medicinal chemistry ,0104 chemical sciences ,Inorganic Chemistry ,Trigonal bipyramidal molecular geometry ,chemistry.chemical_compound ,Octahedral molecular geometry ,Materials Chemistry ,Reactivity (chemistry) ,Physical and Theoretical Chemistry ,Cobalt ,Coordination geometry - Abstract
A series of cobalt(II) complexes, namely [LnCo(NO3)]+Y− (Ln = LA–LD; Y = NO3−, BPh4−) was prepared by the reaction of the corresponding metal starting materials with N,N-bis((1H-pyrazol-1-yl)methyl)-2-(piperidin-1-yl)ethanamine (LA), N,N-bis((1H-pyrazol-1-yl)methyl)-2-morpholinoethanamine (LB), N,N-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-2-(piperidin-1-yl)ethanamine(LC) and N,N-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-2-morpholinoethanamine (LD), respectively. X-ray diffraction studies revealed that the coordination geometry around the Co(II) centre in [LnCo(NO3)]BPh4 (Ln = LA, LB and LD) can be best described as distorted trigonal bipyramidal, whereas [LCCo(NO3)]NO3 showed a distorted octahedral geometry around the Co(II) centre due to the bidentate binding mode of the ligand NO3−. Specifically, the presence of methyl substituents at the pyrazole moieties plays an influential role in determining the anionic exchange capabilities of these complexes. The anion exchange reaction was found to be highly selective; the substitution of the smaller anion NO3− to the bigger anion BPh4− was achieved easily, whereas the attempted anion exchange of BPh4− with NO3− proved unsuccessful.
- Published
- 2019
3. Bifacial CdS/CdTe thin-film solar cells with copper nanowires as a transparent back contact
- Author
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Donghwan Kim, Jihyun Kim, Eunkyo Byun, and Jaeyoung Seo
- Subjects
010302 applied physics ,Materials science ,business.industry ,Nanowire ,chemistry.chemical_element ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Copper ,Atomic and Molecular Physics, and Optics ,Cadmium telluride photovoltaics ,law.invention ,Indium tin oxide ,Optics ,chemistry ,law ,0103 physical sciences ,Solar cell ,Electrode ,Optoelectronics ,0210 nano-technology ,business ,Sheet resistance ,Chemical bath deposition - Abstract
A bifacial CdS/CdTe thin-film solar cell with a superstrate configuration was demonstrated by using copper nanowire (CuNW)/indium tin oxide (ITO) back contacts as a transparent and conductive electrode (TCE). CdS and CdTe were deposited by chemical bath deposition and close-spaced sublimation techniques, respectively. The CuNWs acted both as an acceptor dopant and TCE for the p-CdTe, improving the total cell efficiency compared to a copper-free back contact. CuNW/ITO back contacts with high optical transmittance (72.3% at 550 nm) and low sheet resistance (47.1 Ω/sq.) were obtained. The average cell efficiency of the bifacial CdS/CdTe thin-film cells with the optimized CuNW/ITO back contact was 10.0% (front-side illumination) and 0.55% (rear-side illumination). The quantum efficiencies under front-side and rear-side illumination were studied. The prepared bifacial cell can facilitate full usage of incoming sunlight (direct or diffused), enhancing the output power under cloudy conditions.
- Published
- 2018
4. Granulation of Bismuth Oxide by Alginate for Efficient Removal of Iodide in Water
- Author
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Tae-Hyun Kim, Chihyun Seo, Jaeyoung Seon, Anujin Battulga, and Yuhoon Hwang
- Subjects
bismuth oxide ,alginate ,granulation ,iodide adsorption ,Biology (General) ,QH301-705.5 ,Chemistry ,QD1-999 - Abstract
The granulation of bismuth oxide (BO) by alginate (Alg) and the iodide adsorption efficacy of Alg–BO for different initial iodide concentrations and contact time values were examined. The optimal conditions for Alg–BO granulation were identified by controlling the weight ratio between Alg and BO. According to the batch iodide adsorption experiment, the Alg:BO weight ratio of 1:20 was appropriate, as it yielded a uniform spherical shape. According to iodide adsorption isotherm experiments and isotherm model fitting, the maximum sorption capacity (qm) was calculated to be 111.8 mg/g based on the Langmuir isotherm, and this value did not plateau even at an initial iodide concentration of 1000 mg/L. Furthermore, iodide adsorption by Alg–BO occurred as monolayer adsorption by the chemical interaction and precipitation between bismuth and iodide, followed by physical multilayer adsorption at a very high concentration of iodide in solution. The iodide adsorption over time was fitted using the intraparticle diffusion model. The results indicated that iodide adsorption was proceeded by boundary layer diffusion during 480 min and reached the plateau from 1440 min to 5760 min by intraparticle diffusion. According to the images obtained using cross-section scanning electron microscopy assisted by energy-dispersive spectroscopy, the adsorbed iodide interacted with the BO in Alg–BO through Bi–O–I complexation. This research shows that Alg–BO is a promising iodide adsorbent owing to its high adsorption capacity, stability, convenience, and ability to prevent secondary pollution.
- Published
- 2022
- Full Text
- View/download PDF
5. Arsenic (V) Removal by an Adsorbent Material Derived from Acid Mine Drainage Sludge
- Author
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Erdenechimeg Byambaa, Jaeyoung Seon, Tae-Hyun Kim, Shin Dong Kim, Won Hyun Ji, and Yuhoon Hwang
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arsenic removal ,arsenate ,granular ferric hydroxide ,mine waste adsorbent ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Arsenic is a toxic element that is often found in drinking water in developing countries in Asia, while arsenic poisoning is a serious worldwide human health concern. The objective of this work is to remove arsenic (V) (As(V)) from water by using an adsorbent material prepared from mine waste, called MIRESORBTM, which contains Fe, Al. The performance of the MIRESORBTM adsorbent was compared with granular ferric hydroxide (GFH), which is a commercial adsorbent. Adsorbents were characterized by using scanning electron microscopy (SEM), X-ray fluorescence spectroscopy (XRF), X-ray diffractometry (XRD), and N2 sorption with Brunauer–Emmett–Teller (BET) analysis. The kinetics, isotherms, and pH-dependency of arsenic adsorption were interrogated to gain insights into arsenic adsorption processes. The maximum adsorption capacity of MIRESORBTM was 50.38 mg/g, which was higher than that of GFH (29.07 mg/g). Moreover, a continuous column test that used environmental samples of acid mine drainage was conducted to evaluate the MIRESORBTM material for practical applications. The column could be operated for more than 5840 bed volumes without a breakthrough. Successful operation of a pilot plant using MIRESORBTM adsorbent was also reported. Thus, these studies demonstrate MIRESORBTM as a highly efficient and economical adsorbent derived from recycled mine sludge waste.
- Published
- 2020
- Full Text
- View/download PDF
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