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메르캅토 기능기를 가진 실리카 나노 메조포러스 흡착제에 의한 유독성 중금속이온의 제거에 관한 연구
김정배 ( Jeung Bea Kim ) 한국수처리학회(구 한국수처리기술연구회) 2011 한국수처리학회지 Vol.19 No.1
Mercapto-impregnated mesoporous silica has been developed for the removal of Hg(Ⅱ), Cd(Ⅱ) and Pb(Ⅱ) ions by adsorption. Mesoporous silica used for heavy metals adsorbents were prepared by co-condensation of surfactant as a template and Ludox HS-40 as a silica precursor. These materials have been characterized by elemental analysis, XRD, SEM and TEM analysis. To elucidate the surface characteristic of adsorbents, the zeta potentials were measured. As a result of zeta potential data, mesoporous silica indicated that the surface potentials seem to be dependent on the pH and the low negative charge showed in the range of all pH. Otherwise, the surface potentials of mercapto-impregnated mesoporous silica indicated that positive charge at the pH 3~8. Mercapto-impregnated mesoporous silica effectively removed Hg(Ⅱ) over 87 % from 40 ppm Hg aqueous solution at pH 6.2~6.5 and removed Cd(Ⅱ) over 81 % from 40 ppm Pb aqueous solution and removed Pb(Ⅱ) over 78%, respectively. The removal selectivity by the mercapto- impregnated mesoporous silica was in the order of Hg > Cd > Pb.
Fe(3)로 표면처리된 메조포러스 실리카에 의한 셀렌(Se), 비소(As), 불소(F), 인(P) 제거에 관한 연구
김정배 ( Jeung Bea Kim ),정응호 ( Eung Ho Jung ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.2
Fe(Ⅲ)-impregnated mesoporous silicas were developed for the removal of selenite, arsenate, fluoride and phosphate ions by adsorption in aqueous phase. Mesoporous silica used for heavy metals adsorbents were prepared by co-condensation of surfactant as a template and Ludox HS-40 as a silica precursor. These materials characterized by elemental analysis, XRD and SEM analysis. To elucidate the surface characteristic of adsorbents, the zeta potentials were measured. As a result of zeta potential data, mesoporous silica indicated that the surface potentials seem to be independent on the pH and the low negative charge showed in the range of all pH. On the other hand, the surface potentials of Fe(Ⅲ)-impregnated mesoporous silica indicated that positive zeta potential charge at the pH 3∼8. Fe(Ⅲ)-impregnated mesoporous silica effectively removed 95% of 20 ppm arsenate(As) at pH 4.5∼8.0 and removed 83% of 20 ppm selenite(Se) at pH 4.5∼7.7, respectively. And Fe(Ⅲ)-impregnated mesoporous silica removed 80 % of 20 ppm fluoride(F) at pH 2.5∼7.0 and removed 86 % of 20 ppm phosphate(P) at pH 2.5∼8.0, respectively. The removal selectivity by the Fe(Ⅲ)-impregnated mesoporous silica was in the order of As > P > Se > F.
황화철을 이용한 염소계 유기화합물의 탈염소화 반응 메카니즘에 관한 연구
김정배 ( Jeung Bea Kim ) 한국수처리학회 2004 한국수처리학회지 Vol.12 No.4
N/A Groundwater is an important water resource for many communities and municipalities in our country. Due to past practices in landfill and in toxic chemical disposal, many groundwater supplies are threatened by toxic chemical contaminants. In general, most of the chlorinated chemicals are toxic as forms of aliphatic halogenated organic compounds. In this study, the optimal conditions to detoxify chlorinated compounds by the reductive degradation were investigated. The following results were obtained in the reductive degradation of CCI₄, C₂CI_(6), and C₂HCI_(5), by using FeS and FeS₂ as mediators. CCI₄ was reduced to CH₂CI₃ and CH₂Cl₂ in anaerobic conditions when FeS was used as a mediator. While the reduction of CCI₄ to CHCI₃ was rapidly proceeded, the reduction of CHCI₃ to CH₂Cl₂ was occurred slowly. Further reduction to CH₃CI was not observed. Unlike CCI₄, C₂CI_(6) was degraded to C₂HCI_(5), C₂CI₄. C₂HCI₃ and cis-1,2-C₂H₂Cl₂ by complicated pathways such as hydrogenolysis, dehalo-elimination and dehydrohalogenation. A small amount of C₂HCI_(5) was detected only in the early stages of the reduction. However, majority of the C₂CI_(6) was reduced to C₂CI₄. cis-1,2-C₂H₂Cl₂ was the only product among other possible isomers. Kinetic characteristics dependent on several factors such as iron mineral and organic solvents were investigated. When Fe^(0), FeS and FeS₂ were used as mediators, minerals affecting reaction rate were in the following order : Fe^(0) > FeS > FeS₂ when in contact with C₂CI_(6).
p-Nitrophenyl Carboxylic Ester의 가수분해반응에 미치는 Sodium 2-Pentadecylbenzimidazole-5-sulfonate의 친핵적 및 미셀효과
김정배(Jeung-Bea Kim),김학윤(Hak-Yoon Kim) 계명대학교 낙동강환경원 2006 環境科學論集 Vol.11 No.1
This study is mainly focused on micellar and nucleophilic effect of sodium 2-pentadecylbenzimidazole-5-sulfonate(P-BISO₃Na) solution hydrolysis of p-nitrophenyl acetate (p-NPA), p-nitrophenyl propionate(p-NPP) and p-nitrophenyl valerate(p-NPV) in Tris buffer(pH 8.35). The first order rate constant (kmR-BI) of the reaction in P-BISO₃Na solution are increased by about 10~35 times as compared with those in aqueous solution(kwR-BI). The hydrolysis of p-NPA, p-NPP and p-NPV in micellar solution at optimum P-BI(SO₃Na concentration were increased by about 10, 23 and 35 times respectively as compared with that aqueous solution. Also, the hydrolysis of p-NPV in optimum P-BISO₃Na concentration were increased by about 3.6 times respectively as compared with p-NPA.
김정배(Jeung Bea Kim),김학윤(Hak Yoon Kim) 계명대학교 낙동강환경원 2010 環境科學論集 Vol.14 No.1
Sodium 2-alkylbenzimidazole-5-sulfonate (R-BISO₃Na) were synthesized, and cmc of 2-sodium 2-pentadecylbenzimidazole-5-sulfonate(P-BISO₃Na) by surface tensiometry was measured, which was 6.8×10?? M. This work deals, mainly, with the micellar effect of CTABr and comicellar effect of CTABr and P-BISO₃Na on dephosphorylation of isopropylphenyl-4-nitrophenylphosphinate (IPNPIN) mediated by anion of R-BISO₃Na. The first order rate constants of the reaction in CTABr solution were increased when compared with them in the aqueous solutions. R-BISO₃Na act as a strong catalyzer in the micellar solution, but it have not catalytic effect in water. On the other hand, the first order rate constants of the reaction mediated by R-BISO₃Na were much smaller than those mediated by H-BISO₃Na. It means that, due to the hydrophobicity and the steric effect of the alkyl substituents, these groups would penetrated into the core of the micelle for stabilization by the van der Waals' interaction with long cetyl group of CTABr. And the values of pseudo first order rate constants reach a maximum with increasing of 2-alkyl-BISO₃Na. Such rate maxima are typical of micellar catalysed bimolecular reactions and the rise in rate constant followed by a gradual decrese is characteristic of reactions of hydrophobic substrates. The reactions mediated by P-BISO₃Na in aqueous solution were faster 28 times than those mediated by other H-BISO₃Na. And there was comicellar effect of CTABr and P-BISO₃Na on the reaction rates, although the effect was not large.
친핵적 벤즈이미다졸 기능기를 가진 N, N-Dimethyl-N-Dodecyl-N-(2-Methylbenzimidazoly) Ammonium Chloride 화합물의 합성
김정배(Jeung Bea Kim),김학윤(Hak Yoon Kim) 계명대학교 낙동강환경원 2007 環境科學論集 Vol.12 No.1
New functional surfactant, N, N-dimethyl-N-dodecyl-N-(2-methyl benzimidazoyl) ammonium chloride (DDBAC) having nucleophilic benzimidazole (BI) functional group have been synthesized. The NMR and IR spectrum indicated that it was a single compound and the critical micellar concentration of DDBAC measured by surface tentiometry and electric conductivity method was 8.9×10?⁴M. The binding constants of DDBAC with substrate was determined.
ETAMs 용액내에서 p-Nitrophenylvalate의 가수분해반응에 미치는 o-Iodosobenzoate Ion의 촉매효과
김정배 ( Jeung Bea Kim ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.1
In this study, reaction model and reactions rate accelerated by o-iodosobenzoate ion(IBΘ) on hydrolysis reaction of p-nitrophenyl valate(NPV) using ethyl tri-octyl ammonium mesylate(ETAMs) for quaternary ammonium salts, the phase transfer catalysis(PTC) reagent, were investigated. The effect of IBΘ on hydrolysis reaction rate constant of NPV was weak without ETAMs solutions. Otherwise, in ETAMs solutions, the hydrolysis reactions exhibit higher first order kinetics with respect to the nucleophile, IBΘ, and ETAMs, suggesting that reactions are occurring in small aggregates of the three species including the substrate(NPV), whereas the reaction of NPV with OHΘ is not catalyzed by ETAMs. Different concentrations of NPV were tested to measure the change of rate constants to investigate the effect of NPV as substrate and the results showed that the effect was weak. This means the reaction would be the first order kinetics with respect to the nucleophile. This behavior for the drastic rate-enhancement of the hydrolysis is referred as ``Aggregation complex model`` for reaction of hydrophobic organic ester with o-iodosobenzoate ion(IBΘ) in hydrophobic quarternary ammonium salt(ETAMs) solutions.
TiO₂로 처리된 폐주물사의 메틸렌 블루 색도 제거에 관한 연구
김정배(Jeung-Bea Kim) 계명대학교 낙동강환경원 2012 環境科學論集 Vol.16 No.1
The impregnated TiO₂ powder were prepared by using a support material as the cast-iron sand. Surface characteristic of impregnated TiO₂ were analyzed by FE-SEM. And impregnated TiO₂ structure was analysed by XRD and shown to be rutile type. The impregnated TiO₂ was tested to investigate its capacity to reduce color in wastewater. Dye materials used in this study were Methylene Blue(M. B.) as the direct dye. The effect of 98% of the direct dye(M. B.) are removed at the given conditions. In order to increase its photoactivity, α-Fe₂O₃ and WO₃ were added to TiO₂. There mixed TiO₂ showed better color removal efficiency up to 25% than pure TiO₂. It was found that mixed W, Fe those transition metal oxides and supported on the ceramic can be applied to the field application.