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황철석 , 마그네슘 산화물과 Mg/Al LDH 에 대한 요오드 음이온의 흡착특성
강문자,한필수,이석우 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.4
유해물질인 요오드 음이온에 대한 흡착특성이 높은 물질을 찾기 위해 여러 종류의 광물과 산화물에 대해 흡착실험을 회분식으로 실시하고 이들의 흡착특성을 비교해 보았다. 문헌조사와 예비 흡착실험결과로부터 황철석, 마그네슘 산화물과 소성된 Mg/Al Layered Double Hydroxide가 요오드 음이온에 대해 비교적 좋은 흡착특성을 나타냄을 알 수 있다. 황철석과 마그네슘 산화물의 경우 흡착제의 농도가 일정할 때 초기 요오드 농도가 증가함에 따라 흡착된 요오드의 농도는 증가하였다. 그리고 이들 물질에 대한 요오드 음이온의 흡착특성은 Freundlich 흡착등온선 형태를 따름을 알 수 있다. 소성된 Mg/Al LDH의 경우는 이산화탄소가 배제된 조건에서 흡착실험을 진행시켰는데 황철석과 마그네슘 산화물에 비해 흡착량이 큼을 알 수 있었다. 그리고 소성된 LDH에 대한 요오드 음이온의 흡착등온선은 Langmuir 형태를 나타내고 이때 얻어진 최대흡착량은 3.8×10^(-3)㏖/g이며 K_(ads)는 7.1×10³이다. 소성된 LDH에 대한 요오드 음이온의 흡착은 소성된 LDH의 재구성 반응에 의한 것이며 이는 2단계의 이온교환 과정을 포함한다. 수용액중에 존재하는 탄산이온이 요오드 음이온의 흡착에 미치는 영향을 황철석, 마그네슘 산화물과 Mg/Al LDH에 대해 확인해 보면 황철석과 마그네슘 산화물에 요오드 음이온이 흡착될 때는 탄산이온의 방해를 받지 않고 소성된 LDH의 경우는 탄산이온의 농도가 높을 때 요오드 음이온의 흡착퍼센트가 크게 감소됨을 알 수 있다. To find out the materials having a high adsorption capacity for iodide anion, the adsorption characteristics of iodide on minerals, rock and oxide compounds were investigated and compared by batch experiments. Pyrite, magnesium oxide and calcined Mg/Al LDH are found as good adsorbents for iodide from literature survey and preliminary experiments. When the amount of pyrite or magnesium oxide was constant, the adsorbed amount was increased with initial iodide concentration. The adsorption characteristics of iodide on pyrite or magnesium oxide is represented by Freundlich adsorption isotherm. The adsorption experiments on calcined Mg/Al LDH were performed under the conditions excluding carbon dioxide. The adsorbed amount of iodide on the calcined LDH was higher than that on pyrite or magnesium oxide. The adsorption characteristics of iodide on the calcined LDH is described by Langmuir adsorption isotherm. The maximum adsorbed amount of iodide on the calcined LDH and K_(ads) of adsorption reaction, resulted from adsorption isotherm, are 3.8×10^(-3) ㏖/g and 7.1×10³, respectively. The adsorption of iodide on the calcined LDH is caused by the reconstruction reaction of the calcined LDH and this reaction includes a two-step ion-exchange process. The influence of carbonate anions of the aqueous solution in the adsorption of iodide on pyrite, magnesium oxide and calcined Mg/Al LDH was also investigated. The adsorbed percent of iodide on pyrite or magnesium oxide in the presence of HCO₃^- is similar to that in the absence of HCO₃^-. However, the adsorbed percent of iodide on the calcined LDH decreased sharply with the concentration of HCO₃^- .
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자연물을 활용한 수학적 탐구활동이 유아의 수학개념 및 수학적 성향에 미치는 영향
강문자,오숙현 한국발도르프영유아교육학회 2016 발도르프교육연구 Vol.8 No.1
본 연구에서는 자연물을 활용한 수학적 탐구활동이 유아의 수학개념과 수학적 성향에 미치는 영향 을 알아보고자 하였다. 이를 위하여 전라남도 여수시에 위치한 S어린이집 만 5세 유아 15(남: 8명 여, 여:7명)을 실험집단으로,만 5세 유아 15명(남:8명, 여:7명)을 비교집단으로 구성하였다. 그리고 실험집 단에게 자연물을 활용한 수학적 탐구활동을 15회 실시하였다. 그 결과는 다음과 같다. 첫째, 자연물을 활용한 수학적 탐구활동은 유아의 수학개념을 증진시키는 것으로 나타났다. 또한 수학개념의 구성요소 인 분류, 서열, 측정, 패턴, 수 개념, 공간, 시간 등에 있어서도 유의한 증가를 나타냈다. 둘째, 자연물을 활용한 수학적 탐구활동은 유아의 수학적 성향을 긍정적으로 증진시키는 것으로 나타났다. This study aimed to examine the effects of mathematical exploration activities using natural objects on the mathematical concept and tendency of preschoolers. To this end, the experimental group in this study was consisted of the 15 five-year old preschoolers (male: 8 and female: 7) from the S daycare center located in Yeosu-si, Jeollanam-do. Moreover, the control group was consisted of another 15 five-year old preschoolers (male: 8 and female: 7). Then, the mathematical exploration activities using natural objects had been conducted to the experimental group for a total of 15 times. Following are the findings of these mathematical exploration activities. First, it was found that the mathematical exploration activities using natural objects had enhanced the mathematical concept of preschoolers. In addition, they had lead to a significant increase in the following components of mathematical concept: classification, sequence, measurement, pattern, numerical concept, space, time, etc. Second, the mathematical exploration activities using natural objects were also found to have enhanced the mathematical tendency of preschoolers positively.
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Adsorption Behavior of Aqueous Europium on Kaolinite under Various Disposal Conditions
강문자,한필수 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.2
This work investigated the adsorption behavior of europium on kaolinite under various disposal conditions.Batch-wise adsorption and precipitation experiments and equilibrium model calculations were performed over a pHrange of 4-10 and CO2 concentration range of 0%, 0.03%, and 10%. Experimental precipitation behaviors are inagreement with the results of equilibrium model calculations using the geochemical code MINTEQA2. Aqueousspecies of Eu3+ exists mainly at pH 5 or below and solid phases of Eu(OH)3(s), Eu(OH)CO3(s), and Eu2(CO3)3H 2O(s)are formed at higher pH ranges. Adsorption behavior of Eu on kaolinite in the low pH range can be explained byinterlayer ion-exchange reaction. The significant increase in adsorbed amount at pH 5-6 is due to the surfacecomplexation at the edge site of kaolinite. In the high pH range, precipitation of Eu contributes mainly to the ad-sorption quantity. The rapid decrease in adsorbed amount above pH 7 under 10% CO2 condition occurs by the forma-tion of anionic europium species of Eu(CO3)2-. The adsorption of Eu on kaolinite could be wel interpreted by theFreundlich adsorption isotherm. The data except for the highest equilibrium concentration ranges were also explainedby Langmuir isotherm and the maximum adsorbed quantity of Eu on kaolinite, b, is 1.2 mg/g.
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해체 콘크리트 폐기물에 포함된 $^{55}Fe$와 $^{63}Ni$ 방사능 분석
강문자,정근호,홍상범,최근식,이창우,Kang, Mun-Ja,Chung, Kun-Ho,Hong, Sang-Bum,Choi, Geun-Sik,Lee, Chang-Woo 한국방사성폐기물학회 2007 방사성폐기물학회지 Vol.5 No.1
Combined method of extraction chromatography and liquid scintillation analysis was established for determinating $^{55}Fe\;and\;^{63}Ni$ radioactivity in solid samples. Activated concrete wastes generated from dismantling KRR-2 were analysed. The sequential separation including precipitation and extraction chromatography resulted in the above 90% chemical recoveries of Fe. Above 62% recoveries of Ni were obtained by this procedure exception to 43.6 and 46.5% recoveries. The seperation and counting procedure was also confirmed with spiked samples of known quantity. The measured and spiked quantity were agreed with the 3.7% and 0.7% variations in the $^{55}Fe\;and\;^{63}Ni$ experiments, respectively. The radioactivities of $^{55}Fe$ in the dismantled concretes are shown from below MDA to maximum 362 Bq/g. The radioactivities of $^{63}Ni$ in all concrete samples are below MDA. The $^{63}Ni$ doesn't exist in dismantled concretes from KRR-2. The radioactivity of $^{55}Fe$ is decreased rapidly as the sampling depth is increased from the concrete surface.
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