• Journal of Korean Society of Environmental Engineers
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• v.30 no.4
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• pp.401-408
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• 2008

Adsorption performance of sulfonamide antibiotic compounds such as sulfadimethoxine(SDM), sulfachloropyridazine(SCP), sulfamethazine(SMT), sulfathiazole(STZ) and sulfamethoxazole(SMX) on granular activated carbon(GAC) was evaluated in this study. The coal-based activated carbon was found to be more effective than other carbons in adsorption of sulfonamide antibiotic compounds. The wood-based activated carbon was less effective than coconut- and coal-based carbon in adsorption nevertheless having larger pore volume and specific surface area than others carbons. The maximum adsorption capacities(X/M) of coal-based activated carbon for the five sulfonamide species was 1.3$\sim$1.5 and 1.8$\sim$2.1 times larger than coconut- and wood-based activated carbon, respectively. Carbon usage rates (CUR) of coal-, coconut- and wood-based activated carbons for SCP were 3.55 g/day, 4.29 g/day and 6.47 g/day, respectively. Similar results were obtained in the adsorption of the rest four sulfonamide species. It is concluded that coal-based activated carbon could removed the sulfonamide antibiotic compounds better than other material-based activated carbons.

• KSBB Journal
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• v.14 no.1
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• pp.66-70
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• 1999

Comparison of lead removal characteristics between two strains, Aureobasidium pullulans and Saccharomyces cerevisiae, and effects of extracellular polymeric substances(EPS) excreted by microorganisms on the removal of lead were investigated. The capacity of lead biosorption to A. pullulans which had EPS was increased as the storage time of the cells increased, due to the increased amounts of excreted EPS. When the EPS were removed from A. pullulans cells, the amounts of adsorbed lead were very small(10% of the cell with EPS). In the case of s. cerevisiae which had no EPS, the lead removal capacity was nearly constant with storage time except early stage, but the spending time to reach an equilibrium state decreased with increasing storage time because of lowering the function of cell membrane. Therefore, it seems that the phenomena of lead biosorption were remarkably affected by the presence of extracellular polymeric substances.

• Clean Technology
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• v.25 no.3
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• pp.189-197
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• 2019

In this study an optimization of the preparation conditions of activated carbon with a ternary metal ion material to treat $H_2S$, which is classified as a representative odor substance, was carried out. For a metal ion material for enhancing the adsorption performance of hydrogen sulfide, performance enhancement was confirmed by combining Li and Fe or a ternary combination (K, Li, Fe) based on KI, which is a substance promoting hydrogen sulfide adsorption performance. Also, it was determined by XRD analysis that the reaction of each active substance with $H_2S$ was because of binding. The adsorption performance increased more than 3 times with heat treatment of the adsorbent with nitrogen compared with heat treatment with air. The maximum adsorption constant ($q_m$) value of the optimum adsorbent was 97.07, which is 6 times higher than that of the existing K-based impregnated activated carbon. It was confirmed that the objective adsorption amount ($0.3g\;g^{-1}$) was secured by an equilibrium between the mass transfer rate and adsorption rate. From the results, it was confirmed that the performance improvement was noticeable even when activated carbon with a reagent grade activated carbon particle size was modified. It was confirmed that the adsorption performance exists at high relative humidity levels of 60 and 100%, and the optimized preparation can be applied to a wet process such as a scrubber downstream.

• Applied Chemistry for Engineering
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• v.31 no.3
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• pp.341-345
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• 2020

An in situ regeneration of activated carbon bed using an ozonated water was studied in order for avoiding the carbon loss, contaminant emission and time consuming for discharge-regeneration-repacking in a conventional thermal regeneration process. Using phenol and polyethylene glycol (PEG) as adsorbates, the adsorption breakthrough and in situ regeneration with the ozonated water were repeated. These organics were supposed to degrade by the oxidation reaction of ozone, regenerating the bed for reuse. As the number of regeneration increased, the adsorption capacity for phenol was reduced, but the change was stabilized showing no further reduction after reaching a certain degree of decrement. The reduction of adsorption capacity was due to the increase of pore size resulting in the decrease of specific surface area during ozonation. The adsorption capacity of phenol decreased after the ozonated regeneration because the in-pore adsorption was prevalent for small molecules like phenol. However, PEG did not show such decrease and the adsorption capacity was constantly maintained after several cycles of the ozonated regeneration probably because the external surface adsorption was the major mechanism for large molecules like PEG. Since the reduction in the pore size and specific surface area for small molecules were proportional to the duration of contact time with the ozonated water, careful considerations of the solute size to be removed and controlling the contact time were necessary to enhance the performance of the ozonated in situ regeneration of activated carbon bed.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1992.05a
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• pp.22-22
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• 1992

국내의 토양에서 Streptomyces spp.를 분리하였고 이 중 항균활성이 우수한 균주들을 선별하였다. 이들 균주들을 적절한 조건에서 배양하여 얻은 배양액을 이온 교한 수지와 흡착 크로마토그래피를 행하여 항생물질들을 분리하였다. 이들 항생물질들은 Bacillus subtilis, Pyricularia oryzae, Alternaria mail, Candida albicans, Mycobacterium smegmatis, Pseudomonas aeruginosa , 및 Escherichia coli에 강한 항균활성을 나타내었다. 각 항생물질들을 산으로 가수분해하고 흡착관 크로마토그래피로 가수분해 생성물을 분리하였다. 분리한 항생물질과 가수분해 생성물들의 $^1$IH-NMR, $13^{C}$ -NMR, FAB-Mass 스펙트럼을 분석하여 구조를 연구하였다.

• Nuclear Engineering and Technology
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• v.18 no.3
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• pp.194-199
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• 1986

The behavior of micro amount of Am in aqueous solution were investigated with centrifugation method as a function of pH. In the studies described here, equilibration times were extended to 2-3 weeks to know the aging effect in radiocolloid formation. Also, the effect of the addition of foreign materials, e. g. silica gel and Fe$^{3+}$ were examined as well as the effect of presence of concentrated electrolyte. In the results, Am appeared to be rapidly adsorbed on to impurity particles for pH < 6 and probably on the container walls by an ionic sorption process. The addition of foreign material increased the fraction of Am while the addition of concentrated electrolyte hindered the process. For pH > 7 Am behaved quite differently than for pH < 6. There appeared to be rapid sorption of some Am from solution probably on the container walls followed by partial desorption that occurred over a period of 1-2 days.s.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.11a
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• pp.145-150
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• 1996

약 30$0^{\circ}C$, 160 kg/$cm^2$의 원자로냉각재계통에서 사용이 가능한 $^{60}$Co 제거용 고온흡착제를 얻기 위하여, ZrO$_2$를 zirconyl nitrate를 출발물질로 하여 졸-겔법으로, aluminum isopropoxide를 출발 물질로 하여 A1$_2$O$_3$를, aluminum isopropoxide와 titanium tetraisopropoxide를 출발물질로하여 TiO$_2$-A1$_2$O$_3$를, aluminum isopropoxide와 zirconium propoxide를 출발물질로 하여 ZrO$_2$-A1$_2$O$_3$를 금속알콕사이드 가수분해법으로 제조하였다. 제조한 흡착제는 600~140$0^{\circ}C$의 온도로 하소 하였으며, 결정전이, 열적특성, 비표면적 등의 물성변화를 알아보기 위하여 X선회절, 적외선분광분석, 열분석, 전자현미경 관찰, BET 비표면적 등을 측정하였다. 또한, 고온수에서 이들 흡착제의 Co$^{2＋}$ 흡착특성을 autoclave를 이용한 회분식 흡착실험으로 알아보았다. 이들 흡착제 제조시 하소온도에 따른 Co$^{2＋}$ 흡착량, $Al_2$O$_3$ 흡착제 제조시 pH 변화에 따른 Co$^{2＋}$ 흡착량과 TiO$_2$-A1$_2$O$_3$ 흡착제 제조시 TiO$_2$ 함량에 따른 Co$^{2＋}$ 흡착량과 25$0^{\circ}C$의 고온에서 ZrO$_2$와 $Al_2$O$_3$의 표면에 생성된 코발트 화합물을 XPS와 EPMA로 부터 확인하였다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2006.05a
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• pp.113-114
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• 2006

VOCs의 제어를 위하여 흡착법이 널리 사용되는데 흡착제로서 다공성 탄소가 가장 뛰어남을 보여준다. 이를 resorcinol-formaldehyde과 $Na_2CO_3$으로 졸-겔법으로 메조포러스 xerogels을 제조하고 VOCs의 대표적인 물질인 톨루엔을 흡착시켜 흡착효율을 연구한 결과 흡착효율이 뛰어남을 알 수 있었다.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.04a
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• pp.135-138
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• 2004

본 연구는 중금속으로 오염된 폐수처리에 있어 친환경적 유기흡착제로서 휴믹물질의 활용성을 평가하기 위한 기초 연구로서 이탄(peat moss)으로부터 Humin을 분리 한 후, 중금속 이온(Cd(II),Cu(II))과의 흡착특성을 조사하였다. 이탄으로부터 추출한 peat-Humin의 함량은 94%이상을 나타냈으며, 분자의 작용기 특성은 일반 토양 휴믹물질(soil humic substance)과 유사하였다. peat-Humin과 중금속 이온(Cd(II),Cu(II))과의 흡착 반응은 5분내에 빠른 흡착형을 보였으며, pH 5-6에서 가장 높은 중금속 제거율을 보였다. pH 3의 산성조건에서도 50%정도의 제거율을 보였다. pH 5에서의 등온흡착 실험결과를 Freundlich 등온식에 적용하여 해석한 결과, 각의 중금속에 대한 peat-Humin의 흡착상수(Kf)는 Cd(II)이 8.07 그리고 Cu(II)가 4.56으로 나타났다.

• Journal of the Korean Society of Groundwater Environment
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• v.1 no.2
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• pp.105-112
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• 1994

To investigate the migration behavior of contaminants in rocks. adsorption and diffusion experiments for Sr as a sorbing contaminant and for Cr-EDTA as a non-sorbing contaminant were carried out on granitic rocks. The Sr adsorption on separated minerals and crushed rocks tends to slightly increase with increasing pH. It also greatly decreases with the increase of ionic strength in NaCl solution. Among separated minerals, biotite and sericite have adsorbed much more amount of Sr than other rock-forming minerals, such as quartz, plagioclase, and potassic feldspar, because the specific surfaces and cation exchange capacities of phyllosilicates are generally much greater than those of the other rock-forming minerals. The intrinsic diffusion coefficients of Cr-EBTA for granitic rocks differ little from those of Sr. This indicates that they are independent of water-rock interactions. Experimental data show that the intrinsic diffusion coefficients are positively correlated with the porosities of the rocks. They are close to the theoretically predicted values, especially in pre-steady state diffusion region, with the increase of rock sample thickness.