Biosorption in the Mixed Heavy Metal Solution by Biosorbents of Marine Brown Algae

감상규,이동환,이회근,이민규 ( Sang Kyu Kam,Dong Hwan Lee,Whae Geon Lee,Min Gyu Lee ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1990 No.3

N/A The biomass of nonliving, dried marine brown algae U. pinnatifida, H. fusiforme, and S. fulvelum harvested in the sea near Cheju, were studied for their sorption performance and selectivity of copper, zinc, lead, and chromium. The metal uptakes by biosorbent materials increased with increasing pH in the range of Ci 10-500㎎/L. The metal uptakes by biosorbent materials decreased in the following sequence: Pb>Cr>Cu>Zn. Among the biosorbent materials the decreasing order was as follows: U. pinnatifida≥H. fusiforme>S. fulvelum for copper and zinc; U. pinnatifida>H. fusiforme>S fulvelum for lead and chromium. The metal uptakes(except for lead) by biosorbent materials in the mixed solution, decreased greatly in comparison to those in the single solution.

Study on the Charge Determination of Synthetic Cationic Polymers

감상규,김정호,이민규 ( Sang Kyu Kam,Jung Ho Kim,Min Gyu Lee ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1990 No.3

N/A Visual titrimetry, spectrophotometry, and streaming current detector(SCD) method for end point detection are described for the charge determination of the synthetic cationic polymers of different charge density and molecular weight. The charge densities for each of the cationic polymers by spectrophotometry and SCD method were in good agreement with each other. The results obtained by visual titrimetry are less reliable, compared to other methods, especially for polymers low charge density. With spectrophotometry and SCD method, the titration curves have a sharp break point in the range of the end point reaction for polymers of high charge density, which becomes rather less sharp for polymers of lower charge density. The charge densities for polymer A-L, which are copolymers of polyacrylamide and dimethylaminoethyl acrylate, show pH dependence, becoming lower as pH increases, but the charge density of polydiallyldimethylammonium chloride are independent of pH in the pH range investigated.

제주도 지하수 질산염 농도의 시·공간적 변화 특성: 장기(1993-2015) 모니터링 자료의 평가

김호림(Ho-Rim Kim),오준섭(Junseop Oh),도현권(Hyun-Kwon Do),이경진(Kyung-Jin Lee),현익현(Ik-Hyun Hyun),오상실(Sang-Sil Oh),감상규(Sang-Kyu Kam),윤성택(Seong-Taek Yun) 대한자원환경지질학회 2018 자원환경지질 Vol.51 No.1

1993년부터 2015년까지 관측된 제주도 지하수 장기모니터링 관측정(N = 4,835)에서 수집된 지하수 수질자료(N = 21,568)를 기반으로 질산성질소의 시공간적 변동 특성을 평가하였다. 제주도 지하수의 질산성질소 농도의 중앙값은 2.5 mg/L로서 다른 국가나 대륙의 조사 결과에 비해 다소 높거나 유사한 것으로 나타났다. 또한 지하수 용도, 행정구역 및 고도 별로 유의한 차이를 보였다. 특히, 산간 지역에 비해 저지대 해안가에 위치한 농업 및 주거지역에서 농도가 높음을 확인하였다. Mann-Kendall 및 Sen’s slope 분석을 활용한 질산성질소 농도의 추세 분석 결과, 하류 저지 대에 비해 중산간지역에서의 질산성질소 농도 증가 경향이 뚜렷하였다. 제주도 내 토지 피복의 시계열 변화 특성과 결부 지어 보면, 중산간지역의 오염 증가 추세는 농업지역의 확장 등 인위적 활동 증가에 기인한 결과로 판단된다. 반면,기지정된 지하수자원특별관리구역에서는 전반적으로 질산성질소 농도의 감소 경향이 나타났는데, 이는 지하수 관리 측면에서 수질관리를 위한 적극적인 정책이 유효함을 시사한다. 본 연구에서는 제주도 지하수의 질산성질소 오염관리를 위한 적정 방안을 제안한다. The spatio-temporal variations of nitrate concentrations in groundwater of Jeju Island were evaluated by an analysis of time series groundwater quality data (N = 21,568) that were collected from regional groundwater monitoring (number of wells = 4,835) for up to 20 years between 1993 and 2015. The median concentration of NO 3 -N is 2.5 mg/L, which is slightly higher than those reported from regional surveys in other countries. Nitrate concentrations of groundwater in wells tend to significantly vary according to different water usage (of the well), administrative districts, and topographic elevations: nitrate level is higher in low-lying agricultural and residential areas than those in high mountainous areas. The Mann-Kendall trend test and Sen’s slope analysis show that nitrate concentration in mid-mountainous areas tends to increase, possibly due to the expansion of agricultural areas toward highland. On the other hand, nitrate concentrations in the Specially Designated Groundwater Quality Protection Zones show the temporally decreasing trend, which implies the efficiency of groundwater management actions in Jeju. Proper measures for sustainable groundwater quality management are suggested in this study.

PVA-D2EHPA/TOPO 비드의 제조와 수중의 구리 이온 제거 특성

감상규 ( Sang Kyu Kam ),박정민 ( Jeong Min Park ),이민규 ( Min Gyu Lee ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.9

PVA-D2EHPA/TOPO beads containing two extractants, di-(2-ethylhexyl) phosphoric acid (D2EHPA) and trioctylphoshine oxide (TOPO) were prepared for the removal of copper ions from aqueous solution. The prepared PVA-D2EHPA/TOPO beads were characterized by SEM and FT-IR. The removal characteristics of copper ions by PVA-D2EHPA/TOPO beads was investigated using batch and continuous systems. In batch experiments, the maximum removal capacity calculated from Langmuir isotherm model was 18.6 mg/g and the optimal pH was in the range of 4.5 ∼6. The continuous experiments showed that the removal capacity of copper ions increased with increasing inlet copper ion concentrations and bed heights, but decreased with increasing inlet flow rates.

Dioxane을 용매로 한 PVC-LMO 비드의 제조와 Li+ 흡착특성

감상규 ( Sang Kyu Kam ),유해나 ( Hae Na You ),이민규 ( Min Gyu Lee ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.7

In this study, PVC-LMO beads were prepared by immobilizing lithium manganese oxide (LMO) with poly vinyl chloride (PVC) diluted in dioxane solvent. XRD and SEM analysis confirmed that LMO was immobilized well in PVC-LMO beads. The diameter of PVC-LMO beads prepared by dioxane solvent was about 2 mm. The adsorption experiments of lithium ions by PVC-LMO beads were conducted batchwise. The optimum pH was pH 10. The adsorption characteristics of lithium ions by PVC-LMO beads was well described by the pseudo-second-order kinetic model. The maximum adsorption capacity obtained from Langmuir model was 24.25 mg/g. The thermodynamic parameters such as △H°, △S° and △G° were evaluated. The calculated ΔG° was between .6.16 and .4.14 kJ/mol (below zero), indicating the spontaneous nature of Li+ adsorption on PVC-LMO beads. Also, the results showed that PVC-LMO beads prepared in this study could be used for the removal of lithium ions from seawater containing coexisting ions such as Na+, K+, Mg2+ and Ca2+.

고체상 추출제로서 Polyvinyl Chloride에 D2EHPA를 고정화한 PVC-D2EHPA의 제조와 Cu(II) 제거 특성

감상규 ( Sang Kyu Kam ),유해나 ( Hae Na You ),이동환 ( Dong Hwan Lee ),이민규 ( Min Gyu Lee ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.6

The solid phase extractant (PVC-D2EHPA bead) was prepared by immobilizing di-2-ethylhexyl-phosphoric acid (D2EHPA) with polyvinyl chloride (PVC). The prepared PVC-D2EHPA beads were characterized by using fourier transform infrared spectrometer (FTIR) and scanning electron microscopy (SEM). The removal experiments of Cu(II) by PVC-D2EHPA beads conducted batchwise. The removal kinetics of Cu(II) was found to follow the pseudo-second-order model. The equilibrium data fitted well with Langmuir isotherm model and the maximum removal capacity was 2.6 mg/g at 20℃. The optimum pH region was in the range of 3.5 to 6. and the standard free energy (△Go) was between .4.67 ∼.4.98 kJ/mol, indicating the spontaneous nature of Cu(II) removal by PVC-D2EHPA beads.

연구논문 : 활성탄의 물리적 특성과 표면 특성에 따른 수중의 methylene blue의 흡착특성

감상규 ( Sang Kyu Kam ),유해나 ( Hae Na You ),이민규 ( Min Gyu Lee ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.11

The adsorption characteristics of the methylene blue (MB) were studied using three activated carbons such as ACA and ACB with similar specific surface area (1,185 and 1,105 m2/g), and ACC with relatively high specific surface area (1,760 m2/g). The surface chemical properties of these activated carbons were investigated by X-ray photoelectron spectroscopy (XPS). The results indicated that ACA had more functional groups (with phenol, carbonyl, and carboxyl etc.) than ACB (with carbonyl and carboxyl) and ACC (with carboxyl). The isotherm data were fitted well by Langmuir isotherm model. The adsorption capacities of ACA, ACB, and ACC for MB were 454.7 mg/g, 337.7 mg/g, and 414.0mg/g, respectively. As phenol and carboxyl content of the surface on activated carbon increased, MB adsorption capacity was increased. Although ACA had a smaller specific surface area than ACC, the content of phenol and carboxyl group was abundant, so MB adsorption capacity was found to be higher than ACC.

n-Pentane 증기의 광촉매 분해 시 Methyl Ethyl Ketone 증기와 Ethyl Acetate 증기의 영향

감상규 ( Sang Kyu Kam ),전진우 ( Jin Woo Jeon ),이민규 ( Min Gyu Lee ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.6

The photocatalytic decomposition characteristics of single n-pentane, n-pentane mixed with methyl ethyl ketone (MEK), and n-pentane mixed with ethyl acetate (EA) by cylindrical UV reactor installed with TiO2-coated perforated plane were studied. The effects of the residence time, the inlet gas concentration, and the oxygen concentration were investigated. The removal efficiency of n-pentane was increased with increasing the residence time and the oxygen concentration, but decreased with increasing the inlet concentration of n-pentane. The photocatalytic decomposition rates of single n-pentane, n-pentane mixed with MEK, and n-pentane mixed with EA fitted well on Langmuir-Hinshelwood kinetics equation. The maximum elimination capacities of single n-pentane, n-pentane mixed with MEK, and n-pentane mixed with EA were obtained to be 465 g/m3;day, 217 g/m3;day, and 320 g/m3;day, respectively. The presence of coexisting MEK and EA vapor had a negative effect on the photocatalytic decomposition of n-pentane and the negative effect of MEK was higher than that of EA.

질산으로 개질한 활성탄을 충전한 고정층에서 리튬이온 흡착시의 파과특성

감상규 ( Sang Kyu Kam ),유해나 ( Hae Na You ),이민규 ( Min Gyu Lee ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.6

The adsorption experiments of lithium ions were conducted in the fixed bed column packed with activated carbon modified with nitric acid. Effect of inlet concentration, bed hight and flow rate on the removal of lithium ions was investigated. The experimental results showed that the removal and the adsorption capacity of lithium ions increased with increasing inlet concentration, and decreased with increasing flow rate. When the bed height increased, the removal and the adsorption capacity increased. The breakthrough curves gave a good fit to Bohart-Adams model. Adsorption capacity and breakthrough time calculated from Bohart-Adams model, these results were remarkably consistent with the experimental values. The adsorption capacity was not changed in the case of 3 times repetitive use of adsorbent.

고정화된 해양갈조류 톳에 의한 수중 납의 생물흡착 및 탈착

감상규(Sang Kyu Kam),김현정(Hyun Jeong Kim),이민규(Min Gyu Lee) 한국수처리학회 2001 한국수처리학회지 Vol.9 No.2

The biosorption and desorption of lead by the immobilized biomass of nonliving, dried marine brown alga Hizikia fusiformis by each of Ca-alginate method (Ca-ALG), Ba-alginate method (Ba-ALG), and polyethylene glycol method (YEG), were investigated using the lead concentration of 100-1000㎎/L and the biomass amoiunt of 0.15∼0.6g. As the biomass amount was increased, the lead removal performance increased, but its uptake decreased. The lead uptake by the immobilized biomass increased with increasing initial lead concentration, showed the maximum in the pH range of 4 to about 5, and decreased in the following sequences : Ca-ALG>Ba-ALG>PEG among the immobilization methods. The pattern of lead uptake by the immobilized biomass fitted the Freundlich isotherm better than the Langmuir isotherm. The deposited lead for the immobilized biomass prepared by Ca-ALG and Ba-ALG, was desorbed easily with 0.1-0.5M HCl, with no changes of the immobilized biomass lead uptake capacity and macroscopic appearance in five subsequent biosorption/desorption cycles, except for PEG.