천연 제올라이트의 1가 금속 이온 제거능에 대한 전처리 효과

감상규,오윤근,이용두 제주대학교 해양연구소 2000 해양자원연구소연구보고 Vol.24 No.-

The three domestic natural zeolites (Yong dong-ri (Y).Daesin-ri (D). Seogdong-ri (S)) harvested in. Kyeongju-shi and Pohangshi. Kyungsangbug-Do, were pretreated with each of the NaOH. Ca(OH)_(2) and NaOH following HCI solutions. and the effect of pretreatment of natural zeolites on the removal performances of monovalent metal ions (Cs^(+), Rb^(+) and Ag^(+)) was investigated in the single and mixed solutions. In the single metal ion solution. the removal performances of metal ions were improved greatly by the pretreatment of natural zeolites and decreased in the following sequences: pretreatment of Na0H>pretreatment of NaOH following HCpretreatment of Ca(0H)_(2) among the pretreatment methods: D>Y>S among the natural zeolites: Cs^(+)>Rb^(+)>Ag^(+) among the metal ions. The heavy metal ion exchange capacity by natural and pretreated zeolites was described either by Freundlich equation or Langmuir equation. but it followed the former better than the latter. In the mixed metal ion solution. the uptakes by natural and pretreated zeolites decreased. in comparing with those in the single metal ion solution, but the pretreated zeolites showed the improved removal performances of metal ions in the mixed solution than in the single solution. The metal ion uptakes by pretreated zeolites in the mixed solution showed the same trends in the single solution among the pretreatment methods and metal ions.

수중의 Pyrene, Chrysene 및 Benzo[a]pyrene의 광분해(Ⅱ)

감상규,김지용,주창식,이민규 한국환경과학회 2003 한국환경과학회지 Vol.12 No.7

The photodegradations of pyrene, chrysene and benzo[a]pyrene that were similar in structure among polycyclic aromatic hydrocarbons (PAHs) were investigated with a low-pressure mercury lamp(the wavelength of 253.7 ㎚ and UV output of 1.35x10^(-3) J/s). The optimum concentrations of TiO₂ and H₂O₂ on the photodegradation of pyrene, chrysene and benzo[a]pyrene were 1 g/L and 1.5 x 10^(-3) M, respectively. By these optimum concentrations, their rates increased with increasing the concentration of TiO₂ and H₂O₂ because the amounts of OH radical formed increased, but for the higher concentrations than the optimum, their rates decreased with increasing those concentrations because the white turbidity phenomena occurs in case of TiO₂ and H₂O₂ acts as an OH radical inhibitor. The photodegradation rates among the photodegradation processes such as UV, UV/TiO₂, UV/H₂O₂, and UV/H₂O₂/TiO₂ decreased in the following sequences: UV/H₂O₂/TiO₂> UV/H₂O₂> UV/TiO₂> UV.

합성 Goethite에 의한 인산이온, 황산이온 및 구리이온의 혼합용액에서의 흡착특성

감상규,이동환,이민규 한국환경과학회 2003 한국환경과학회지 Vol.12 No.10

Adsorption on goethite of individual component from a solution containing phosphate, sulfate, or copper ion was investigated. Competitive adsorption in the binary and ternary solution systems composed of phosphate, sulfate. and copper ions was also investigated. In competitive adsorption systems with phosphate and sulfate ions. the presence of phosphate ion reduced the adsorption of sulfate ion largely. On the other hand. the presence of sulfate ion caused only a small decrease in phosphate adsorption. This result suggests that phosphate ion is a stronger competitor for adsorption on goethite than sulfate ion. which is consistent with the higher affinity of phosphate for the surface compared to sulfate ion. Compared to the results from single-sorbate systems, adsorption of copper ion in the binary system of sulfate ion and copper ion was found to be enhanced in the presence of sulfate ion. Addition of sulfate ion to the binary system of copper ion and phosphate ion resulted in a small enhancement in copper sorption. This result implies that the presence of sulfate ion promotes adsorption of the ternary complex FeOHCuSO₄. The adsorption isotherms could be well described by the Langmuir adsorption equation.

제주도 한림항내 표층퇴적물 중의 부틸주석화합물의 분포

감상규,김현정,허철구,최영찬,이민규 한국환경과학회 2003 한국환경과학회지 Vol.12 No.7

Butyltin compounds (BTs), namely tributyltin (TBT), dibutyltin (DBT) and monobutyltin (MBT), were measured in surface sediments collected in 2001 inside Hallim Harbor where a lot of shipping occurs as one of major harbors of Jeju Island, in order to evaluate their distribution. BTs were detected in surface sediments of all stations and their concentrations were comparable to those in surface sediments of other sites of domestic and foreign countries. The main species among BTs was MBT, although there was a little difference with a survey site. No correlations were obtained between organic matter or particles size of surface sediments and total BTs, indicating that these factors did not affect on the distribution of BTs. It was estimated that more complex factors including BTs loads and surrounding sedimentary environments, affected on the distribution of BTs. The high correlations between BTs indicated that DBT and MBT were mainly degraded from TBT based on antifouling paints of vessel etc. and other sources, such as DBT and MBT, could be ignored. The butyltin degradation indexes ([DBT] + [MBT]/[TBT]) were in the range of 1.5~3.3 (mean 2.5), indicating that the parent compound, TBT, were inflowed into the surface sediments a long years ago and degraded.

석탄회로 합성한 제올라이트에 의한 Sr(Ⅱ) 및 Cs(Ⅰ) 이온의 제거 특성

감상규,이동환,문명준,이민규 한국환경과학회 2003 한국환경과학회지 Vol.12 No.10

The adsorption behaviors of strontium and cesium ions on fly ash, natural zeolites, and zeolites synthesized from fly ash were investigated. The zeolites synthesized from fly ash had greater adsorption capabilities for strontium and cesium ions than the original fly ash and natural zeolites. The maximum adsorption capacity of synthetic zeolite for strontium and cesium ions was 100 and 154 ㎎/g, respectively. It was found that the Freundlich isotherm model could fit the adsorption isotherm. The distribution coefficients (K_(d)) for strontium and cesium ions were also calculated from the adsorption isotherm data. The distribution coefficients decreased with increasing equilibrium concentration of strontium and cesium ions in solution. By studying the removal of cesium and strontium ions in the presence of calcium. magnesium, sodium. potassium. sulfate, nitrate, nitrite, and EDTA (in the range of 0.01 - 5 mM) it was found that these coexistence ions competed for the same adsorption sites with strontium and cesium ions.

천연 제올라이트에 의한 Phosphamidon 및 Fenitrothion의 흡착 특성

감상규,허철구 濟州大學校 海洋硏究所 2002 해양과환경연구소 연구논문집 Vol.26 No.-

The adsorption characteristics of phosphorus insecticides(phosphamidon and fenitrothion) used in large amounts in golf course in natural zeolite(clinoptilolite) was investigated. The distribution coefficient, K_D and Freundlich constant, K_F, were higher for fenitrothion than those for phosphamidon, i.e., fenitrothion with the higher octanol-water partition coefficient(K_OW) was adsorbed the more on natural zeolite. The pesticide amount per unit mass of natural zeolite, decreased with increasing temperature but independent of pH, regardless of pesticides used in this study.

황토로부터 합성한 제올라이트에 의한 Cd(Ⅱ) 및 Cu(Ⅱ) 흡착특성

감상규,홍정연,허철구,이민규 한국환경과학회 2003 한국환경과학회지 Vol.12 No.7

Various kinds of zeolites, such as analcime (ANA), cancrinite (CAN), Na-P1 and sodalite octahydrate (SOD) could be synthesized from Hwangto by hydrothermal reaction in a high-pressure vessel. The adsorption characteristics of Cu(Ⅱ) and Cd(Ⅱ) by Hwangto and its synthetic zeolites were investigated using the chemical and electrochemical surface parameters of these adsorbents. The heavy metal adsorptivity among the adsorbents decreased in the following sequences: Na-P1 > SOD > ANA > CAN > Hwangto. This sequence was the same with the values of surface site density (Ns) of these adsorbents and was correlated inversely with the values of pHpzc (pH of the point of zero charge) and the values of Ka2(int) (intrinsic surface deprotonation constant) of the adsorbents for synthetic zeolites, i.e., the adsorbents with higher values of Ns and with lower values of pHpzc and Ka₂(int) for synthetic zeolites showed higher heavy metal adsorptivity. With increasing pH, the heavy metal adsorptivity increased greatly between pHpzc and pH 6 or 7 because of the steep increase of negatively charged sites for synthetic zeolites, but for Hwangto, it increased broadly because of slow increase of negatively charged sites based on its lower surface sites.

천연 제올라이트의 1가 금속 이온 제거능에 대한 전처리 효과

감상규,오윤근,이용두 제주대학교 해양연구소 2000 해양과환경연구소 연구논문집 Vol.24 No.-

The three domestic natural zeolites (Yong dong-ri (Y). Daesin-ri (D). Seogdong-ri (S)) harvested in Kyeongju-shi and Pohang-shi. Kyungsangbug-Do, were pretreated with each of the NaOH, Ca(OH)2 and NaOH following HCI solutions, and the effect of pretreatment of natural zeolites on the removal Performances of monovalent metal ions (Cs+, Rb+ and Ag+) was investigated in the single and mixed solutions. In the single metal ion solution, the removal performances of metal ions were improved greatly by the pretreatment of natural zeolites and decreased in the following sequences : Pretreatment of NaOH> pretreatment of NaOH following HCI>pretreatment of Ca(OH)2 among the pretreatment methods ; D>Y>S among the natural zeolites: Cs+>Rb+>Ag+among the metal ions. The heavy metal ion exchange capacity by natural and pretreated zeolites was described either by Freundlich equation or Langmuir equation. but it followed the iormer better than the latter. In the mixed metal ion solution. the uptakes by natural and pretreated zeolites decreased. in comparing with those in the single metal ion solution, but the pretreated zeolites showed the improved removal performances of metal ions in the mixed solution than in the single solution. The metal ion uptakes by pretreated zeolites in the mixed solution showed the same trends in the sing1e solution among the pretreatment methods and metal ions.

Bromothymol Blue-Cetyldimethylbenzylammonium Chloride에 의한 음이온성 界面活性劑의 分光光度定量

甘相奎,吳潤根 제주대학교 1991 논문집 Vol.33 No.-

산성염료인 BTB는 pH9 부근에서 긴 알킬기를 가지는 제4급 암모늄이온인 CDMBA??를 첨가하면 CDMBA??와 BTB의 상호작용에 의해 청색에서 청록색으로 각각 변색되고, 이러한 계에 미리 음이온성계면활성제(AS??)를 첨가하면 AS??와 CDMBA??가 이온회합하기 때문에 CDMBA??의 농도가 감소하여 CDMBA??와 BTB와의 상호작용은 억제되므로 AS??의 증가에 따라 BTB의 고유의 청색이 진해지는 것을 이용하여 614nm에서 흡광도를 측정하여 음이온 계면활성제인 SDS, SDBS 및 SDOSS의 분광광도 정량법을 확립하였으며, 다음과 같은 결과를 얻었다. 1. CDMBA??와 BTB와의 이온회합에 미치는 최적반응 pH는 8.5~9.5이며, CDMBA??는 AS??와 1:1로 반응함을 알 수 있다. 2. SDS, SDBS 및 SDOSS의 정량범위는 각각 0-396.6㎍, 0-470.4㎍, 0-622.4㎍으로 미량에서 비교적 넓은 농도범위까지 정량이 가능하였다. 3. 본 정량법은 다량의 무기염류가 공존하여도 영향을 거의 받지 않고 조작이 간편하게 SDS 및 SDOSS의 정량에 작용할 수 있고 실제 하천수중에 응용한 결과 96.6-105.2%의 만족할 만한 회수율을 얻었다. A simple and rapid spectrophotometric method for the determination of sodium dodecylsulfate(SDS), sodium dodecylbenzenesulfonate(SDBS), and sodium dioctylsulfosuccinate(SDOSS) was established by the reaction of these anionic surfactants and cetyldimethylbenzylammonium ion(CDMBA??) with bromothymol blue (BTB) and the absorbance measurements were made at 614nm. In the reaction of CDMBA?? and BTB, the condition of pH was suitable in the range of 8.5∼9.5 Beer's law did hole in the range of 0∼396.6㎍ for SDS, 0∼470.4㎍ for SDBS. and 0622.4㎍ for SDOSS. Many foreign inorganic ions present in water did not interfere. The average recovery for anionic surfactants in river water was 96.9∼105.2%.

활성탄/플리우레탄 복합담체를 충전한 바이오필터에서 H₂S의 제거특성

감상규,강경호,임진관,이민규 한국환경과학회 2004 한국환경과학회지 Vol.13 No.1

A biofiltration system using activated carbon/polyurethane composite as solid support inoculated with Bacillus sp. was developed for treating a gaseous stream containing high concentrations of H₂S. The effects of operating condition such as the influent H₂S concentration and the empty bed contact time (EBCT) on the removal efficiency of H₂S were investigated. The biofilter showed the stable removal efficiencies of over 99 % under the EBCT range from 15 to 60 sec at the 300 ppmv of H₂S inlet concentration. When the inlet concentration of H₂S was increased, the removal efficiencies decreased, reaching 95 and 74%, at EBCTs of 10 and 7.5 sec, respectively. The maximum elimination capacity in the biofilter packed with activated carbon/polyurethane composite media was 157 g/m³/hr.