• Applied Biological Chemistry
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• 제25권2호
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• pp.99-104
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• 1982

천연(天然) zeolite를 분리(分離)하여 동정(同定)한 후(後) $Na^+$로 포화시키고 3가지 농도의 NaCl용액 중(中)에서 P흡착현상(吸着現象)을 $P^{32}$ 동위원소(同位元素)를 이용(利用)하여 조사(調査)하였다. Na-zeolite에는 pH가 낮을수록, 반응시간(反應時間)이 길수록 또 시료량(試料量)이 많을수록 P흡착량(吸着量)이 증가(增加)됐으며 시료(試料)와 용액(溶液)의 비율(比率)이 작은 편이 단위중량당(單位重量當) 흡착량(吸着量)이 많았다. 전해질(電解質) 농도가 클수록 P의 흡착량(吸着量)이 늘었으며 최대흡착량(最大吸着量)은 1me/g 정도(程度)였으며 Na-zeolite의 ZPC는 pH 3.7 이하(以下)일 것으로 추정(推定)된다.

• 한국토양비료학회지
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• 제21권4호
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• pp.380-385
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• 1988

Zeolile에 의한 Urease의 활성(活性)과 특성(特性)에 미치는 영향(影響)을 구명(究明)하기 위하여, Zeolite의 Urease 흡착양상(吸着樣相)과 흡착(吸着)된 Urease의 여러가지 성질(性質)들을 조사(調査)하였다. Zeolite의 존재하(存在下)에서 용액중(溶液中)에 유리(遊離)된 Urease는 흡착(吸着)이 최대(最大)에 도달(到達)할 때까지 Zeolite에 흡착(吸着)되며, pH 7.0에서의 최대흡착량(最大吸着量)은 11.3mg urease/100mg Zeolite이었다. Zeolite에 의한 Urease의 흡착(吸着)은 주로 정전기적(靜電氣的) 결합(結合)에 의하여 Zeolite의 외표면(外表面)에서 이루어지며, 흡착량(吸着量)의 70%이상(以上)이 30분(分) 이내(以內)에 흡착(吸着)되었다. 흡착(吸着)된 Urease는 Free Urease에 비(比)하여 활성(活性)이 89.6%나 감소(減少)되었으며, Km치(値)는 3배(倍) 이상(以上)이나 증가(增加)된 34.4mM이었다. 흡착(吸着)된 Urease의 최적(最適) pH는 6.5~7.0으로 Free Urease의 7.0에 비하여 그 범위(範圍)가 넓어졌으며, Protease에 대한 저항성(抵抗性)은 약(弱)하여 졌다. 또한, 기질특이성(基質特異性)과 열(熱)에 대한 안정성(安定性)에는 변화(變化)가 없었다.

• 한국토양비료학회지
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• 제18권3호
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• pp.240-246
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• 1985

사질답(砂質畓)의 토양개량제(土壤改良劑)로서 사용(使用)할 Zeolite의 최적(最適) 입도(粒度)를 알아보기 위한 기초실험으로서 입경(粒徑)이 다른 모래의 column에 입경별(粒徑別) Zeolite를 시용(施用)하여 Zeolite 이동(移動)을 조사(調査)한 결과(結果)는 다음과 같다. 0.1mm이상(以上) 크기의 Zeolite입자(粒子)는 96시간(時間) 투수(透水)하여도 수직이동(垂直移動)은 거의 없었다. 0.1mm이하(以下) 크기의 Zeolite입자(粒子)는 96시간(時間) 투수(透水)함으로 2~1, 1~0.5, 0.5~0.25mm sand column에서 각각 85.7, 32.64, 25.50% 이동(移動)하였다. 공극크기 측면만을 고려한 대하천 주위의 사질답(砂質畓)에 적합한 Zeolite입자(粒子)는 0.25~0.1mm fraction으로 추정되었다.

• 한국작물학회지
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• 제22권2호
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• pp.37-41
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• 1977

간척지 제염정도에서 유실되는 유효한 비료성분을 흡착하고 완급하여 비효를 증진시키기 위하여 토양개량제인 Zeolite를 시용하여 수도 생육과 그 수량에 미치는 영향을 시험한 결과를 요약하면 다음과 같다. 1) Zeolite를 시용한 처리구에서의 토양염도 변화는 최고분얼기 이후에 무시용구에 비해 0.07∼0.12%차로 감소되었다. 2) 수도생육에 있어서 Zeolite시용 효과는 각 구 공히 Zeolite 600kg시용구가 양호하였으며 그 효과는 최고분얼기에 현저히 나타나 수량까지 영향을 미쳤다. 3) Zeolite시용구에 있어서 수수 및 일수영화수는 증수요인으로 작용하였고, 유효경율과 등숙비율은 수량과 부의 경향이었다. 4) 현미수량에 있어서 Zeolite시용 효과는 인도형인 '유신'이 일본형인 '진흥'보다 현저하게 나타났다. 5) Zeolite시용에 있어서 양 시비(표준비구와 1.5신 비구 및 품종(유신과 진흥) 처리구 공히 600kg/10a가 적정량으로 인정되었다.

• 한국물환경학회지
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• 제25권5호
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• pp.750-757
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• 2009

The ammonium ion exchange characteristics of natural zeolite were investigated to remove ${NH_4}^+-N$. The effect of water temperature, particle size and competitive cation on the exchange capacity was examined. Ammonium ion exchange capacity tended to decrease when the temperature increased from $25^{\circ}C$ to $40^{\circ}C$. Exchange capacity was increased according to the particle size of natural zeolite comes to be small. Batch isotherm experiments were conducted for measuring ammonium ion exchange capacity. The ion exchange capacity was well described either by the Langmuir isotherm model or by the Freundlich isotherm model. The ammonium ion exchange capacity ($q_m$) of zeolite carrier can be calculated $11.744mg-{NH_4}^+/g$-carrier. The ion exchange capacity of manufactured zeolite carrier was showed a similar tendency as ion exchange capacity of powder-sized natural zeolite. Therefore, zeolite carrier can be used for increasing of nitrogen removal efficiency in the wastewater treatment plants.

• 환경위생공학
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• 제12권3호
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• pp.61-71
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• 1997

This study was conducted to examine the adsorption capacity of $NH_{3}-N$ by natural zeolite for the purpose of investigating the possibility for $NH_{3}-N$ eliminator of korea natural zeolite. The dominant clay minerals of zeolite was clinoptiloite. The amount of $NH_{3}-N$ adsorption by zeplite was not significantly affected by the particle size of zeolite and increased with increasing the ratio of zeolite to the volume of solution. Removal ratio of 100% of NH$_{3}$-N by non, 1st, 2nd regenerated cloumn was continued separately during 4.5, 18, 30hr and this amount was each 0.081, 0.324, 0.540g $NH_{3}-N/zero$.100g. The eluenting amount of K, Ca, Mg was increased on the zeolite cloumn according to that of Na decreased. The amount of 74% of $NH_{3}-N$ was desorved on the zeolite cloumn for regenerating treatment during 8hr. The perfect removal amount was $0.216gNH_{3}-N/zero$.100g on the zeolite cloumn with field sample.

• 한국결정성장학회지
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• 제9권3호
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• pp.309-314
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• 1999

새로운 촉매 소자로 각광 받고 있는 TS-1 Zeolite를 초기 반응액의 pH를 변화시켜 합성하였다. 반응물의 pH는 10.0에서 11.5 까지의 범위를 가지며, pH 10.4 에서는 큰 기공(8~10$\AA$)을 가진 TS-1 Zeolite(ETS-10)가 합성되는 반면 pH가 11.5에서는 작은 기공(3~5$\AA$)을 갖는 TS-1 Zeolite(ETS-4)가 합성되었다. pH의 범위가 10.4에서 11.5 내에서는 두 가지 물질이 동시에 존재하였다. 합성된 TS-1 Zeolite의 결정화, 물리적 화학적 성질은 XRD, XRF, SEM 과 FT-IR에 의해 연구되었다.

• 한국안전학회지
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• 제27권6호
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• pp.59-63
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• 2012

The use of dry chemical powder has been increased as it can be stored for a long period and sustain in stable condition compared to gas or liquid phase extinguishing agents. A new type of dry chemical powder using Zeolite was produced in the research. Chemical powder was adsorbed into Zeolite 13X, a porous material appearing negative catalytic effect, to create extinguishing powder obtaining core shell structure and measured physical properties and run a small scale fire extinguishment. SEM, XRD, TA analysis was also executed, and extinguishing characteristics were measured by fire extinguishing experiment on oil pool fire. The experiment showed that the average particle size of Zeolite 13X was equivalent, indicating about $3{\pm}1{\mu}m$ and thermal analysis result illustrated that Zeolite 13X showed exothermic reaction peaks at $900^{\circ}C$ due to solid-state transformation. Extinguishing characteristics on oil fire of $NaHCO_3$/Zeolite 13X and $NH_4H_2PO_4$/Zeolite were improved, influenced by adsorbed extinguishing powders on Zeolite 13X and Zeolite 13X that contains high phase transition temperature.

• 한국환경과학회지
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• 제21권5호
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• pp.573-578
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• 2012

In this study, adsorption of polychlorinated biphenyls(PCBs) in transformer oil on powder activated carbon (PAC) and synthetic zeolite was evaluated. Adsorption characteristics of PCBs on the PAC and zeolite has been investigated in a batch system with respect to adsorbents amount and contact time. BET results showed 908 m2/g for PAC and 483 m2/g for zeolite. The adsorption capacity of PCBs increased with an increasing input amount of absorbent. The adsorption experimental results showed that PAC removed 90% of input PCBs in transformer oil while zeolite removed only 64%. Adsorption of PCBs to PAC and zeolite fit the Freundlich model well. The Freundlich parameter, Kf, for PAC and zeolite was 193.1 and 43.0 respectively, indicating that PAC is effect adsorbent for PCBs adsorption in transformer oil.

• 한국표면공학회지
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• 제26권6호
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• pp.334-340
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• 1993

The physico-chemical properties and characteristics after thermal treatment of natural zeolite from Kampo area were studied. The physico-chemical properties of natural zeolite were studied by investigating chemical composition, x-ray diffraction pattern(XRD), scanning electronic microscope(SEM), infrared spec-tra(IR), thermal analysis(TA), and cation exchange capacity(C.E.C.), and the characteristics of natural zeo-lite after thermal treatment from $400^{\circ}C$ to $900^{\circ}C$ were compared with the natural zeolite. This study showed that clinoptilolite was the predominant costituent in natural zeolite, and the natural zeolite contained a little amount of quartz and feldspar as impurities. Zeolite mineral was seen to develop slowly by the natural alternation of volcanic ash considering the almost amorphous crystal structure. The more temperature of ther-mal treatment increased, the more adsorption capacity decreased, considering the fact that the hydroxy peak diminished on infrared spectra, and that cation exchange capacity also decreased distinctly.