• Membrane and Water Treatment
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• 제13권5호
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• pp.227-233
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• 2022

The objective of the study, to develop adsorbent based purifier for removal of radiological and nuclear contaminants from contaminated water. In this regard, 3-aminopropyl silica functionalized with ethylenediamine tetraacetic acid (APS-EDTA) adsorbent prepared and characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). Prepared APS-EDTA used for adsorptive studies of Cs(I), Co(II), Sr(II), Ni(II) and Cd(II) from contaminated water. The effect on adsorption of various parameters viz. contact time, initial concentration of metal ions and pH were also analyzed. The batch method has been employed using metal ions in solution from 1000-10000 ㎍/L, contact time 5-60 min., pH 4-10 and material quantities 50-200 mg at room temperature. The obtained adsorption data were used for drawing Freundlich and Langmuir isotherms model and both models were found suitable for explaining the metal ions adsorption on APS-EDTA. The adsorption data were followed pseudo second order reaction kinetics. The maximum adsorption capacity obtained 1.3037-1.4974 mg/g for above said metal ions. The results show that APS-EDTA have great potential to remove Cd(II), Co(II), Cs(I), Ni(II) and Sr(II) from aqueous solutions through chemisorption and physio-sorption.

• 상하수도학회지
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• 제10권1호
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• pp.121-130
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• 1996

Adsorption isotherms of three trihalomethanes(THMs: $CHCl_3$, $CHBrCl_2$ and $CHBr_2Cl$) and the other organics(p-chlorophenol and sucrose)on activated carbon fibers(ACFs) were measured. Adsorption capacities of the ACFs for these THMs were found to be comparable with or slightly larger than those of granular activated car bons(GACs) which have been widely used for trihalomethanes control in drinking water. Also, the breakthrough curve prediction was successfully carried out using a mathematical model on basis of the assumption that the adsorption equilibrium is instantaneously established when a THM solution contacts the ACF. In practice, THM removal from drinking water was investigated at water works using benchscale ACF adsorptJOn columns. The volume of water treated at a space velocity(SV) of about $100h^{-1}$ was approximately 40 l/g-ACF. The practical adsorption capacities of PCP and sucrose in column adsorption were in good agreement with those of theoretically calculated results using the batch adsorption measurments. And the saturation time model of these substrates in the columns was also agreed succesfully with practical measurments.

• 폴리머
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• 제26권1호
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• pp.121-127
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• 2002

Acrylonitrile을 그라프트시킨 아미드옥심화 polypropylene 섬유이온교환체(AOPP-g-AN)의 충전 bed 높이를 변화시켜 간수 중 우라늄 이온 흡착 특성 및 흡착 공정 특성을 관찰하였다. 아미드옥심형 섬유이온교환체의 팽윤율은 그라프트율 100%, 물과 과산화수소 용매에 대하여 각각 8.54, 8.87 g/g을 나타내었다. 이온교환용량은 그라프트율이 증가함에 따라 증가하였으며, 그라프트율 100%에서 3.99 meq/g으로 최대를 나타내었다. 회분식 흡착에서 우라늄 흡착은 10분 이내에 초기 흡착 평형에 도달하며, 흡착 속도는 9.50 mg/min으로 나타났다. 최종 흡착 용량은 3.95 meq/g이었으며, pH에 따른 흡착 특성 변화는 관찰되지 않았다. 충전비에 따른 연속식 흡착시 흡착 용량은 L/D=1에서 3.92 meq/g으로 최대를 나타내었으며, L/D<2에서 편류 및 불균일 흡착에 의한 2단계 과정으로 파과가 나타남을 확인하였다. 실제 간수에 대한 우라늄 흡착 실험 결과, 흡착 용량 및 파과시간은 각각 3.63 meq/g, 26 min으로 모의용액과 비교 시 주목할만한 흡착능 저하는 관찰되지 않았다.

• 한국대기환경학회지
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• 제29권6호
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• pp.773-779
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• 2013

This study was performed to provide the basic data for the function of BTEX removal for compact electrostatic precipitator which are applicable to indoor environment (or closed spaces). For this purpose, the adsorption equilibrium test was conducted for BTEX of activated carbon sheet (ACS) and activated carbon (AC), and the adsorption characteristics of AC and ACS were evaluated using the Langmuir constant which was obtained from the adsorption characteristics, adsorption capacity and regression calculation. The surface area and adsorption pore volume of ACS reduced by 70% and 86%, respectively, as compared to those of AC, and the adsorption capacities of BTEX also showed a similar level. Thus, it is considered that ACS applied electrostatic precipitator is able to remove dust and BTEX simultaneously.

• 한국식품과학회지
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• 제25권5호
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• pp.521-525
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• 1993

계면에서의 단백질 흡착 기작을 연구하기 위하여 여러 단백질의 A/W 계면에서의 흡착이 조사되었다. BSA intermediates들의 흡착결과는 단백질 2차, 3차 구조가 계면에서의 흡착기작에 영향끼친 것을 나타냈으며, succinylated ${\beta}-lactoglobulin$의 흡착에서는 순 음전하의 증가가 정전기적 상호작용에 영향끼침을 보여 주었다. 또한 ${\beta}-casein$의 흡착은 물 구조를 파괴하는 chaotropic 염 존재하에서 흡착속도가 떨어지는 것을 시사했다.

• 설비공학논문집
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• 제25권8호
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• pp.457-463
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• 2013

Nowadays, adsorption chillers have been receiving considerable attention, as they are energy saving and environmentally benign systems. A fin tube type heat exchanger in which adsorption/desorption takes place is required with more compact size. The adsorption chiller is expected to have high energy efficiency in utilizing the waste heat exhausted from a process. The objectives of this paper are to scrutinize the effect of design parameters on the adsorption performance, especially the fin pitch of the fin tube, and to develop an optimal design fin tube heat exchanger in a silica gel/water adsorption chiller. From the numerical results, the fin pitch of 2.5 mm shows the highest adsorption rate, compared to other fin pitches, such as 5 mm, 7.5 mm and 10mm. Also, the adsorption rate is affected by the cooling water and hot water temperature.

• Food Science and Biotechnology
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• 제17권2호
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• pp.330-335
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• 2008

Water vapor adsorption kinetics of 3 different types of chitosan-based films, i.e., control chitosan, chitosan/montmorillionite (Na-MMT), and chitosan/silver-zeolite (Ag-Ion) nanocomposite films, were investigated at temperature range of $10-40^{\circ}C$. In all the films, water vapor is initially adsorbed rapidly and then it comes slowly to reach equilibrium condition. Reasonably good straight lines were obtained with plotting of 1/($m-m_0$) vs. l/t. It was found that water vapor adsorption kinetics of chitosan-based films was accurately described by a simple empirical model and the rate constant of the model followed temperature dependence according to Arrhenius equation. Arrhenius kinetic parameters ($E_a$ and $k_o$) for water vapor adsorption by chitosan-based films showed a kinetic compensation effect between the parameters with the isokinetic temperature of 315.52 K.

• 폴리머
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• 제26권5호
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• pp.551-558
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• 2002

술폰산형 섬유이온교환체를 이용하여 도금 폐수 중 니켈 이온 분리를 위해 각각의 조건에 따른 니켈 이온에 대한 흡착 특성을 관찰하였다. 술폰산형 섬유이온교환체의 함수율은 술폰화도 극성이 클수록 크게 나타났으며 이온교환용량은 술폰화도가 증가함에 따라 증가하였으며 술폰화도 16%에서 3.38 meq/g로 높게 나타났다. 니켈이온의 흡착은 pH 변화에 따라 크게 변화하지 않았고 모든 흡착은 10분 이내에 약 7.5 mg/min의 흡착속도로 매우 빠르게 평형에 도달하였다. 재생 시 흡착용량은 7회까지 3.15 meq/g으로 거의 100% 가까이 탈착되었으며 그 이상에서는 2.01 meq/g으로 약간 감소하는 것으로 보아 본 연구에 사용한 이온교환체는 내구성에 문제가 없는 것으로 판단되었다. 한편 흡착평형 시간은 L/D의 값이 증가함에 따라 선형적으로 증가하였으며, 최대 흡착용량은 각각 2.71∼3.01 meq/g으로 약간 증가하였고 L/D의 변화에 크게 영향이 없는 것으로 보아 L/D<2로 흡착칼럼의 설계가 가능할 것으로 사료되었다. 또한 이온교환 섬유의 충전비가 일정할 때 pH 변화에 따른 니켈 이온의 흡착량은 산성 pH에서는 큰 변화가 없는 것으로 보아 도금수세액의 pH가 산성인 점을 고려할 때 pH 5 이하가 적합한 것으로 판단되었다.

• 한국환경과학회지
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• 제24권9호
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• pp.1123-1129
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• 2015

This research was performed by means of several different virgin granular activated carbons (GAC) made of each coal, coconut and wood, and the GACs were investigated for an adsorption performance of iodine-131 in a continuous adsorption column. Breakthrough behavior was investigated that the breakthrough points of the virgin two coals-, coconut- and wood-based GACs were observed as bed volume (BV) 7080, BV 5640, BV 5064 and BV 3192, respectively. The experimental results of adsorption capacity (X/M) for iodine-127 showed that two coal- based GACs were highest (208.6 and $139.1{\mu}g/g$), the coconut-based GAC was intermediate ($86.5{\mu}g/g$) and the wood-based GAC was lowest ($54.5{\mu}g/g$). The X/M of the coal-based GACs was 2~4 times higher than the X/M of the coconut-based and wood-based GACs.

• 통합자연과학논문집
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• 제6권3호
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• pp.151-157
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• 2013

The ion exchange resins were synthesized from 1-aza-18-crown-6 macrocyclic ligand attached to styrene (2th petroleum in 4th class hazardous material) divinylbenzene (DVB) copolymer with crosslinks of 1%, 6%, and 15% by substitution reaction. These synthetic resins were confirmed by chlorine content, elementary analysis, surface area, and IR-spectrum. The object of this study was to seperate the metal ion absorbed in reinforcement water fire extinguishing agent. As the results of the effects of pH, equilibrium arrival time, and crosslink of synthetic resin on metal ion adsorption for resin adsorbent, the metal ions were showed high adsorption at pH 3 or over and adsorption equilibrium of metal ions was about 2 hours. In addition, adsorption selectivity for the resin in water was the order of Al (III) > Ni (II) > Sm (III) ions, adsorbability of the metal ions was in the crosslinks order of 1%, 6%, and 15%.