• Nuclear Engineering and Technology
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• 제40권6호
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• pp.489-496
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• 2008

Ferrocyanide-anion exchange resin was prepared and the prepared ion exchange resins were tested on the ability to uptake $Cs^+$ ion. The prepared ion exchange resins were resin-KCoFC, resin-KNiFC, and resin-KCuFC. The three tested ion exchange resins showed ion exchange selectivity on the $Cs^+$ ion of the surrogate soil decontamination solution, and resin-KCoFC showed the best $Cs^+$ ion uptake capability among the tested ion exchange resins. The ion exchange behaviors were explained well by the modified Dubinin-Polanyi equation. A regeneration feasibility study of the spent ion exchange resins was also performed by the successive application of hydrogen peroxide and hydrazine. The desorption of the $Cs^+$ ion from the ion exchange resin satisfied the electroneutrality condition in the oxidation step; the desorption of the $Fe^{2+}$ ion in the reduction step could also be reduced by adding the $K^+$ ion.

• Nuclear Engineering and Technology
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• 제46권1호
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• pp.93-100
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• 2014

The paper deals with the application of radio isotopic non-destructive technique in the characterization of two industrial grade anion exchange resins Indion GS-300 and Indion-860. For the characterization of the two resins, $^{131}I$ and $^{82}Br$ were used as tracer isotopes to trace the kinetics of iodide and bromide ion-isotopic exchange reactions. It was observed that the values of specific reaction rate ($min^{-1}$), amount of iodide ion exchanged (mmol), initial rate of iodide ion exchange (mmol/min) and log $K_d$ were calculated as 0.328, 0.577, 0.189 and 19.7 respectively for Indion GS-300 resin, which was higher than the respective values of 0.180, 0.386, 0.070 and 17.0 calculated for Indion-860 resins when measured under identical experimental conditions. Also at a constant temperature of $40.0^{\circ}C$, as the concentration of labeled iodide ion solution increases 0.001 M to 0.004 M, the percentage of iodide ions exchanged increases from 75.16 % to 78.36 % for Indion GS-300 resins, which was higher than the increases from 49.65 % to 52.36 % compared to that obtained for Indion-860 resins. The overall results indicate that under identical experimental conditions, Indion GS-300 resins show superior performance over Indion-860 resins.

• Nuclear Engineering and Technology
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• 제53권9호
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• pp.2918-2925
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• 2021

The efficiency of decontamination of model spent ion exchange resins, contaminated with magnetite and hematite, with mineral acid solutions, and using electro-decontamination, was evaluated. It has been shown that effective hematite dissolution occurs in concentrated mineral acid solutions. However, the use of direct current increases the decontamination efficiency of spent ion exchange resins contaminated with hematite. It is determined that with increasing voltage and acid concentration, the dissolution efficiency of hematite deposits increases and can exceed 99%. It has been shown that hematite dissolution is accompanied by secondary adsorption of radionuclides due to ion exchange, which can be removed with sodium nitrate solutions.

• 공업화학
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• 제1권1호
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• pp.23-29
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• 1990

급속동결 전처리가 유기이온교환 수지의 분쇄에 미치는 효과를 연구하였다. 습윤상태의 이온교환 수지를 고체탄산 또는 액체질소를 이용하여 급속동결하면 이온교환 수지의 내부구조가 물리적으로 파괴되며 일단 파괴된 수지는 다시 실온이 되어도 원래의 상태로 회복되지 않음을 발견하였다. 따라서 급속동결한 수지는 실온에서도 분쇄가 매우 용이하며 이 효과는 양이온교환 수지가 음이온교환 수지에 비하여 더 크게 나타났다. 아울러 음이온교환 수지의 경우, 급속동결 전처리 효과 뿐만 아니라 이온종류 역시 분쇄에 큰 영향을 미침을 관찰할 수 있었다.

• 멤브레인
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• 제34권2호
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• pp.132-139
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• 2024

Total dissolved solids (TDS) 제거에 이용되는 이온교환수지는 컬럼에 충진시켜 사용하게 되는데, 이온교환 과정에서 이온성 물질과 이온교환수지의 충분한 접촉시간을 필요로 한다. 본 연구에서는 이온교환수지의 분체화를 통하여 짧은 접촉시간으로도 높은 TDS 제거 성능을 보이는 이온교환수지의 특성을 연구하였다. 흐름성 등을 고려한 분체의 최적 크기는 100 ㎛ 이상임을 확인하였고, 250~500 ㎛d와 100~250 ㎛ 크기의 최대 분쇄 수율은 각각 67.3%와 36.9%였다. 또한 100~500 ㎛ 크기의 분쇄 수율은 분쇄 시간 2분에서 87.1%로 나타났다. 회분식(batch) 실험 조건에서 250~500 ㎛ 크기의 분체가 95%와 99%의 제거율에 도달하는 시간은 분쇄 전(non-pulverized) 이온교환수지에 비해 각각 1.82배와 1.96배 더 빨랐다. 100~250 ㎛ 크기의 분체는 각각 15.9배와 6.18배 더 빨랐다. 컬럼 테스트의 경우 분쇄 전 이온교환수지는 총 1.74 g, 250~500 ㎛ 크기의 분체는 1.83 g, 100~250 ㎛ 크기의 분체는 1.63 g의 NaCl을 제거하였다. 분체의 크기가 작아질수록 용량(capacity)이 약간 감소한 것으로 나타났다. 결과적으로 분체화된 이온교환수지를 사용하는 것이 접촉시간 대비 높은 TDS 제거 성능을 얻을 수 있는 방법임을 확인하였다.

• 환경위생공학
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• 제15권4호
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• pp.114-122
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• 2000

Several new ion exchange resins have been synthesized from chloromethyl styrene-1,4-divinylbenzine with 1%, 2%, 5% and 105-crosslink and macrocyclic ligands of cryptand type by interpolymerization method. The adsorption characteristics and the pH, time, solvents and concentration dependence of the adsorption of uranium ion by this resins were studied. The resins were very stable in both acidic and basic media and have good resistance to heat at $300^{\circ}C$. The uranium ion are not adsorbed on the resins below pH 3.0, but the power of adsorption of it increased rapidly above pH 4.0. The optimum equilibrium time for adsorption of uranium ion was two hours and adsorptive power decreased in proportion to crosslink size of the resins and order of dielectric constants of solvents used and the adsorption for uranium ion was bin the order of $OdienNtn-H_4$ > $OtnNen-H_4$ > $OtnNen-H_4$ > $OenNen-H_4$.

• 대한화학회지
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• 제3권1호
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• pp.18-22
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• 1954

The cation exchange resins are synthesized from p-phenolsulfonic acid, formalin, and sodium hydroxide catalyser, and the ion exchange properties of them are studied with respect to their reactant ratios. Maximum exchange capacity was 2.06 me/G, much smaller than the theoretical value of 3.42 me/G to be expected for that of the structure: Under the present experimental conditions, much -SO3H radical should have been split away.

• 한국물환경학회지
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• 제29권6호
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• pp.777-781
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• 2013

Ion-exchange technology is one of the best for removing nitrate from drinking water. However, problems related to the disposal of spent brine from regeneration of exhausted resins must be overcome so that ion exchange can be applied more widely and economically, especially in small communities. In this background, a combined bio-regeneration and ion-exchange system was operated in order to prove that nitrate-laden resins could be bio-regenerated through direct contact with denitrifying bacteria. A nitrate-selective A520E resin was successfully regenerated by denitrifying bacteria. The bio-regeneration efficiency of nitrate-laden resins increased with the amount of flow passed through the ion-exchange column. When the fully exhausted resin was bio-regenerated for 5 days at the flowrate of 30 BV/hr and MLSS concentration of $125{\pm}25mg/L$, 97.5% of ion-exchange capacity was recovered. Measurement of nitrate concentrations in the column effluents also revealed that less than 5% of nitrate was eluted from the resin during 5 days of bio-regeneration. This result indicates that the main mechanism of bio-regeneration is the direct reduction of nitrate by denitrifying bacteria on the resin.

• 한국재료학회지
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• 제26권9호
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• pp.498-503
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• 2016

The characteristics of aqueous lithium recovery by ion exchange were studied using three commercial cation exchange resins: CMP28 (porous type strong acid exchange resin), SCR-B (gel type strong acid exchange resin) and WK60L (porous type weak acid exchange resin). CMP28 was the most effective material for aqueous lithium recovery; its performance was even enhanced by modifying the cation with $K^+$. A comparison to $Na^+$ and $H^+$ form resins demonstrated that the performance enhancement is reciprocally related to the electronegativity of the cation form. Further kinetic and equilibrium isotherm studies with the $K^+$ form CMP28 showed that aqueous lithium recovery by ion exchange was well fitted with the pseudo-second-order rate equation and the Langmuir isotherm. The maximum ion exchange capacity of aqueous lithium recovery was found to be 14.28 mg/g and the optimal pH was in the region of 4-10.

• 전기화학회지
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• 제18권1호
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• pp.24-30
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• 2015

일반적으로 저농도의 염 용액에서 탈염성능이 우수한 축전식 탈염기술에 고농도의 염을 함유한 용액을 처리할 수 있는 가능성을 확인하기 위해 spacer와 spiral 형태의 두 가지 모양의 유로에따라 이온교환수지를 채움으로써 탈염효율을 비교분석하고 기술의 적용가능성을 평가하였다. Spacer와 spiral 형태로 이온교환수지를 채운 축전식 탈염 셀의 탈염효율은 각각 77.21 및 99.94%로, 이는 spiral 형태의 유로에 채워진 이온교환수지가 유입수와 고르게 접촉할 수 있는 유로의 모양을 구성하기 때문에 많은 이온들이 제거될 수 있었다고 판단된다. 또한 pH와 축적 전하량의 변화량에서 탈염성능을 감소시킬 수 있는 페러데이 반응이 현저하게 줄어들었다. 따라서 본 연구를 통해 에너지효율적인 축전식 탈염 기술을 이용하여 고농도의 염 용액의 탈염에 대한 가능성을 제시해주었고, 이온교환수지의 혼합비율의 최적화와 연속식 전기탈이온 기술의 재생공정의 도입에 대한 추가적인 연구를 통해 이상적인 탈염기술을 개발하는 데 큰 기반이 될 것으로 기대된다.