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TTAB로 표면 개질한 유기점토계 흡착제에 의한 비소 및 셀렌 제거에 관한연구
김정배 ( Jeung Bea Kim ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.2
Batch adsorption experiments were performed to remove arsenate and selenite, fatal aqueous toxins, with adsorbents(bentonite and kaolinite) modified by tetradecyl trimetyl ammonium bromide(TTAB). The cation exchange capacity of bentonite was 68.3 meq/100 mg and that of kaolinite was 14.3 meq/100 mg. The specific surface area of bentonite was 118 m2/g and that of kaolinite was 13 m2/g. As the amount of added TTAB was increased, specific adsorptions were occurred for bentonite and kaolinite. The electric charges were moved to positive values in all pH ranges with 5×10-5 M TTAB surface modification. With the initial concentration of 1×10-5 M for bentonite, 96 % of the surface modification were occurred at all pH ranges and relatively higher surface modifications were occurred around pH 7. However, 72 % of the surface modification were occurred around pH 7 with the initial concentration of 1×10-5 M for kaolinite and the lower surface modifications were shown at all other pH levels. Higher surface modificaitons were shown for both bentonite and kaolinite when ionic strengths were low. Surface modified adsorbents are stable at all pH ranges as a result of desorption test. And bentonite could remove more than 95∼97 % of arsenic and selenium at all pH ranges. However, kaolinite showed only 40∼60 % removal efficiency for arsenic and selenium at all pH ranges. The physical properties such as cation exchange capacity, specific surface area and surface modification would bring difference between bentonite and kaolinite.
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.
상전이촉매 용액내에서 N-actey-DL-alanine-p-nitrophenyl Ester의 가수분해반응에 미치는 o-Iodosobenzoate 이온의 영향
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 phase transfer catalysis(PTC) effects of ethyl tri-octyl ammonium bromide(ETABr) and ethyl tri-octyl ammonium mesylate(ETAMs) solution including o-iodosobenzoate ion(IBθ) on hydrolysis of N-actey-DL-alanine-p-nitrophenyl ester(NAAP) in Carbonate buffer(pH 10.4). The first order rate constants(kEIB) of the reaction in ETABr and ETAMs solution mediated by o-iodosobenzoate ion(IBθ) are increased by about 220~250 times as compared with those in aqueous solution(kwIB) respectively. The reaction rate of NAAP was very faster than that of p-nitrophenylpropionate(p-NPV) under the same condition(pH 7.4). We have a apparent evidence that aggregation ability of this o-iodosobenzoate ion(IBθ) to ETABr and ETAMs is very high and the reaction orders for three substrate, NAAP, IBθ and ETABr are respectively larger than unit.
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.