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폐 PET 기반 활성탄의 CO<sub>2</sub> 및 N<sub>2</sub> 흡착특성
이정문 ( Jeong Moon Lee ),최태승 ( Tae Seung Choi ),박광현 ( Kwang Hyun Park ),송성호 ( Sung Ho Song ),심왕근 ( Wang Geun Shim ) 한국환경기술학회 2022 한국환경기술학회지 Vol.23 No.6
In this study, waste polyethylene terephthalate (PET) based activated carbon (AC) with different textural properties were prepared by adjusting the KOH mixing ratio. The prepared ACs were characterized by SEM, TEM, XRD, XPS and nitrogen adsorption analysis. From the characterization results, ACs showed a good correlation between the KOH mixing ratio and the surface area, pore volume and pore size, but there was no correlation with the surface chemical composition. In addition, the adsorption equilibrium amount of CO<sub>2</sub> and N<sub>2</sub> was measured under different temperature and pressure conditions using a volumetric adsorption apparatus. The adsorption amount of the target gas showed a good correlation with the ultramicropore volume (V<sub><0.9 nm</sub>) rather than the surface area and total pore volume of ACs. The gas adsorption behaviors according to the pore structure were compared and analyzed by adsorption isotherm models, isosteric heat of adsorption, and adsorption energy distribution function (AED). The selectivity for CO<sub>2</sub> calculated using the ideal solution theory (IAST) under flue gas (CO<sub>2</sub> : N<sub>2</sub> = 15 : 85) conditions suggests that the waste PET-based AC can be sufficiently used for the related CO2 adsorptive separation process.
키토산 기반 나노 구조 다공성 활성탄의 CO<sub>2</sub> 및 N<sub>2</sub> 흡착특성
김진우 ( Jin Woo Kim ),홍웅길 ( Woong Gil Hong ),최태승 ( Tae Seung Choi ),심왕근 ( Wang Geun Shim ) 한국환경기술학회 2024 한국환경기술학회지 Vol.25 No.1
In this work, nano-structered porous activated carbon (AC), prepared from chitosan through KOH chemical activation procedures, exhibits favorable adsorption characteristics for both CO<sub>2</sub> and N<sub>2</sub>. The distinct physicochemical properties of the prepared ACs were primarily characterized using nitrogen adsorption analysis, SEM, and XPS. A clear correlation was observed between the textural properties and the KOH mixing ratio, whereas no consistent pattern was identified between the chemical composition and the KOH mixing ratio. Pure component adsorption isotherm data revealed that a greater ultra-micropore volume (V<0.9 nm) corresponds to increased adsorption of CO<sub>2</sub> and N<sub>2</sub>. Additionally, the adsorption characteristics of these gases demonstrated correlation with quadrupole moment, polarizability and kinetic diameter. The Sips equation provided the best fitting results for the measured isotherm data. Furthermore, the adsorption affinity and the adsorption energy distribution functions prove valuable in comparatively assessing the surface heterogeneity of the prepared ACs. Calculated CO<sub>2</sub>/N<sub>2</sub> selectivities using the ideal adsorbed solution theory(IAST) suggest that ACs with well-developed ultramicropores hold significant potential for adsorptive separations, including applications in flue gas and direct air capture.
만성 신부전 환자에서 Catecholamine 의 제거율
이은주(Eun Joo Lee),위경소(Kyoung So Wee),최태승(Tae Seung Choe),차대룡(Dae Ryong Cha),조원용(Won Yong Cho),김형규(Hyoung Kyu Kim),김형건(Hyoung Gun Kim),최원충(Won Chung Choi) 대한내과학회 1989 대한내과학회지 Vol.37 No.5
N/A The adrenergic system interacts with a vaiety of tissues and organs, including the kidney. However, there is little known about the renal clearance of catecholamine (CAs) in man. To obtain this information, 4 normal subjects and 6 patients with chronic renal failure (CRF) were studied. Plasma and urinary CAs concentrations were measured by high performance liquid chromatography with an electrochemical detector. Plasma CAs concentrations (pg/ml) were norepinephrine (NE) 44.62±83.29 (pg/ml) end DOPAC 585.58±462.47 in normal subjets, and NE 632.20±290.40 and DOPAC 990.55±69.05 in CRF. Plasma CAs concentrations of the CRF group were higher than those of normal subjects, but did not differ significantly among the groups (p<0.05). Urinary CAs excretion amounts were NE 59.3±34.9 (pg/ml), E 11.9±10.2. DOPAC 27.l±61.4, and dopamine 13.4±11.2 in normal subjects, and NE 100.0±90.1, E 135.5±147.4, DOPAC 401.7±500.7, and dopamine 163.9±115, 7 in CRF. Urinary CAs and CAs clearance levels were lower in the CRF group than in normal subjects, but did not differ significantly between the groups. It is concluded that a chronic reduction in excretory kidney function may have no relevant impact on circulatory levels of CA per se, although their urinary excretion falls distinctly at the stage of advanced renal failure. These aspects deserve consideration when pathogenetic or diagnostic studies of catecholamines are performed in normotensive or hypertensive patients with impaired kidney function.
이규백(Kyu Back Lee),변현주(Hyun Ju Byoun),최태승(Tae Seung Choi),김선숙(Sun Sook Kim),조원용(Won Young Cho),김형규(Hyoung Kyu Kim),정태시(Tae See Chung) 대한내과학회 1990 대한내과학회지 Vol.39 No.2
N/A Carbon disulfide (CS2) is a volatile, colorless liquid and has an aromatic odor at room temperature. It has been used as a solvent for the spinning process in viscose rayon plants and also in cellophane and agricultural medicine plants, We experienced 38 workers who possibly suffered from chronic CS2, intoxication. Accordingly, we are reporting our opinions on synthetics and their effects on humanes. The time of exposure to CS2, gas was noted from 2 to 19years/(mean±SD 12±4.5yrs). The age range was from 30 to 64 years. With respect to clinical findings, patiets complained of neuralgia (86.8%), headache (63. 2%), memory disturbance (44.7%), visual dimness (36.8%), decreased sexual libido (29.6%), and hypertension (26.3%). The laboratory findings showed proteinuria in eight patients, azotemia in three patients, anemia in three patients and low HDL-cholesterol level in eight patients. Among the 38 workers, there was polyneuropathy in 13 patients by EMG, sensory neural hearing loss in nine patients, hemorrhage and exudate in eight patients by funduscopy, and cortical dysfunction in six patients by EEG.
위경소,최태승,이석준,조원용,김형규,최원충 대한내과학회 1990 대한내과학회지 Vol.38 No.1
Nowadays, the incidence of heavy metal posisoning is increasing, especially in developing countries. The authours experienced and managed 6 patients highly suspected of chronic mercury poisoing. These patients were workers in a small electric lamp company, ballooning the lamps by mouth. They inhaled mercury vapor during their work. The authours evaluated these patients by EMG, MMPI, kidney and liver needle biopsy and measured the blood and urine mercury concentration by atomic absorption spectrophotometry. The results are as follows: 1) The mean duration of exposure to mercury was 40. 8±35.0 months and the mean duration of symptom and signs was 13.0±4.2 months. 2) The main symptoms of these patients were headache(5/6), generalized weakness(4/6) and tremor(2/6). 3) On routine laboratory evaluatioin including MMPI and EMG, we couldn't find any specific abnormal finding. 4) In liver biopsy, diffuse hepatocyte swelling and sinusoidal dilatations was found in 5 patients. In the EM finding of kidney biopsy, dark-black-round pigments of the lysosomes of the proximal tubular epithelial cells are found in 2 patients. 5) After chelation therapy, the blood mercury decreased and urinary excretion of mercury increased, esplcially in 2 patients who excrete little amounts of mercury before chelation therapy.