• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2018.06a
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• pp.41-41
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• 2018

안정적이고 효율적인 전력 공급을 위해 번화가 대로변 주변에 다수의 지상 변압기 및 개폐기가 설치되고 있으며, 이로 인해 불법 부착물로 인한 도시의 미관 훼손, 변압기 및 개폐기의 오염 등의 문제가 발생하고 있다. 따라서 각 산업체 및 연구 기관에서는 부착 방지용 코팅 도료 및 시트에 대해 다양한 연구개발을 진행하고 있으며, 현장에 적용되고 있는 사례도 있다. 하지만 현재 현장에 적용된 대부분의 제품들은 약 1년 정도의 시간이 지나면 고유의 기능을 상실하며, 도료 및 시트와 기판 사이의 박리가 일어나 우수한 성능을 보이지 않아, 결과적으로 도시에 더욱더 악영향을 주고 있다. 이러한 원인으로는 도료 및 시트의 성능 평가를 위한 다양한 규격들이 존재하지만, 테이프류 탈착 시 영향을 주는 인자(Factor)들이 명확하게 설정되어 있지 않고, 이에 대해 면밀하게 분석한 자료가 없으며, 정량적이고 객관적인 시험 방법이 고려되지 않고 있기 때문에 좋은 제품을 선별하기 어려운 상황이다. 따라서 여러 가지 제품들의 비교평가 및 기술 개발에 활용할 수 있는 가이드라인을 제시하기 위해 일반적으로 사용되고 있는 면테이프(Duct tape)를 이용하여 기판(Substrate)에 대해 다양한 인자를 기준으로 탈착 특성을 측정 및 평가하였다. 현재 지상 배전함 및 개폐기는 분체도장(Powder coating)으로 구성되어져 있으며, 그 모재는 탄소강(Carbon steel)으로 이루어져 있고, 소수의 경우 스테인리스(Stainless steel)를 사용하기 있기 때문에 분체도장(Powder coating), 탄소강(Carbon steel), 스테인리스(Stainless steel)를 기판으로 선정하여 탈착 특성을 평가했다. 탈착 특성에 관여하는 요인으로는 탈착 각도(Peeling angle), 탈착 속도(Peeling speed), 표면 조도(Surface roughness) 등이 있고, 상대 습도(Relative humidity)의 경우 탈착 특성에 영향을 거의 주지 않는 것을 확인했다. 탈착 시 각도가 클수록, 속도가 빠를수록, 조도가 작을수록 부착력(Peel resistance, N/cm)과 탈착 에너지(Energy, J)가 커지며, 탈착 특성에 영향을 주는 인자를 바탕으로 95% 신뢰도 구간을 적용한 탈착특성 모델링을 제시하였다. 이 모델링을 이용하여 실제 현장에서 발생할 수 있는 다양한 각도($90^{\circ}$, $180^{\circ}$)와 속도 범위(100 ~ 1500mm/min)에서의 탈착 특성을 추정하는 것으로, 좋은 성능 및 내구성을 가진 제품을 효과적으로 선별한다.

• Clean Technology
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• v.16 no.1
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• pp.33-38
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• 2010

The characteristics of desorption reaction and the heating values of used activated carbons collected from the companies of Shiwha/Banwal industrial complex were investigated. The desorption characteristics of used activated carbons were analyzed based on the data obtained from a thermogravimetric analyzer. The activation energies and reaction orders for desorption reaction of used activated carbons were calculated by employing Freeman-Carroll method. Heating values of volatile organic compounds(VOC) desorbed from used activated carbons were estimated based on the data obtained from a total hydrocarbon analyzer. It was found that the reaction orders of desorption of used activated carbons were 0.1~0.8, their desorption activation energies, 6.9~26.4 kJ/mol, and VOC heating values, 0.4~10.7 kcal/kg.

• Clean Technology
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• v.23 no.4
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• pp.421-428
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• 2017

In this study, we have investigated the characteristics of adsorption and desorption of toluene, methyl ethyl ketone (MEK) and their binary component using activated carbon. The BET analysis was performed to identify the characteristics of the activated carbon, and the desorption characteristics with temperature were examined to find out an optimum desorption temperature. Ten cyclic experiments of adsorption-desorption were performed, where each adsorption temperature was maintained at room temperature and desorption temperature at upto $120^{\circ}C$. In case of single component cyclic test, the efficiencies of adsorption and desorption decreased as the cycle increased. MEK which has lower affinity with activated carbon than toluene showed lower efficiencies of adsorption and desorption. In case of binary component cyclic test, a typical roll-up phenomenon was observed during adsorption process, where MEK reaches at breakpoint first and then was swept out by toluene.

• Korean Chemical Engineering Research
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• v.48 no.6
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• pp.752-756
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• 2010

Desorption reaction characteristics of the used activated carbons collected from painting process in Shiwha/Banwal industrial complex were investigated. Thermogravimetric analyzer was used to investigate the desorption characteristics. Activation energies and reaction orders for desorption reaction characteristics of used activated carbons were estimated by employing Friedman method and Freeman-Carroll method. In the used activated carbons collected from painting process, it was found that the activation energies were 20.6~43.2 kJ/mol in Friedman method and 12.3~26.5 kJ/mol in Freeman-carroll method, and reaction orders were 0.1~1.7.

• Journal of Soil and Groundwater Environment
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• v.13 no.2
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• pp.21-29
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• 2008

Sorption and desorption processes play an important role in the transport and fate of organic contaminants in subsurface system. In this study, sorption and desorption characteristics of atrazine in 7 soils selected at the Gwangju area were investigated. Soil organic carbon contents ranged from 0.42 to 2.82%. Sorption and desorption experiments were performed in batch slurries. Sorption distribution coefficient ($K_d$) of atrazine were ranged from 0.48 to 3.26 l/kg and $K_d$ value increased with increasing organic carbon contents except of Kyongbang and Youngdong soils. Single desorption data were analyzed by the three-site desorption model including equilibrium, non-equilibrium and non-desorbable site. Non-desorbable site fractions of atrazine in all soils were enumerated and non-desorbable atrazine was observed in seriesdilution desorption experiment. Sorption/desorption hysteresis was also observed in the series-dilution desorption experiment.

• Journal of the Korea Organic Resources Recycling Association
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• v.21 no.4
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• pp.82-87
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• 2013

A study on desorption and regeneration characteristics for silver ions adsorbed onto crab shells was carried out by means of Nitric acid soultion which was selected as the best desorbing agent. Desorption efficiency for silver ions was the highest as about 96% at the 1.0M of Nitric acid concentration. Also, silver ions was almost desorbed below 1.0 of S/L(mg/mL) ratio which is defined as the ratio of adding amount of adsorbent and volume of desorbing agent and most of desorption process was completed within 60min. And removal efficiency of reused crab shells for silver ions was maintained as about 92% until the 2nd cycle.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.808-813
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• 1998

EDTA 의 농도 및 온도가 일정한 조건에서 수용액의 pH 를 변화시켜 가며, 토양으로부터 Co$^2$$^{+}$ 이온의 탈착특성을 살펴보았다. 실험범위에서, pH 4 일 때 $CO_2$$^{+}$ 이온의 탈착율이 가장 양호하였으며, pH 가 상승함에 따라 탈착율이 감소되는 것으로 나타났다. 또한, 반응중 철 성분이 용해되어 나오는데 이는 반응 초기 수소이온에 의한 용해와 반응중 탈착된 Co$^2$$^{+}$ 이온에 의한 용해로 설명하였다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2007.05a
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• pp.131-133
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• 2007

본 연구는 톨루엔이 흡착된 활성탄에 따라 MW를 적용함으로써 열적 탈착을 유도하여 활성탄을 재생하는데 그 목적을 두었다. 따라서 MW를 활성탄에 적용함으로써 발생하는 특성을 다음과 같이 분석하였다. 100W, 500W출력의 MW를 GAC에 적용 시 저출력인 100W에서는 방전 현상이 일어나지 않았으며, MW의 출력이 높아질수록 활성탄의 급속한 온도상승과 그에 따른 빈번한 방전이 발생하였다. 이는 출력이 높아 온도상승이 급속해지면 GAC에 흡착된 VOCs를 탈착 시에는 유리하나 높은 온도와 더불어 방전으로 인해 톨루엔의 분해가능성이 높아져 2차적인 오염물질을 배출할 수 있는 문제점을 알 수 있었다. 따라서 100W의 출력에서도 GAC에 흡착 된 톨루엔을 탈착시키기에 충분한 온도 상승과 방전 줄임 현상을 알 수 있었다. 또한 100W의 출력에서 98%의 탈착 효율을 얻을 수 있었으며 GC/MS 분석결과 탈착가스의 성분에서 95.6%의 톨루엔을 검출 할 수 있었다.

• Journal of the Mineralogical Society of Korea
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• v.22 no.4
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• pp.289-295
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• 2009

The characteristics of phosphate desorption on kaolinite was studied by batch adsorptiondesorption experiments. Desorption procedure was carried out through sequential extraction method at pH 4. The phosphorous contents were measured using UV-VIS-IR spectrophotometer with 820 nm wavelength. The adsorption-desorption reaction of P on kaolinite was irreversible, and most of adsorbed P on kaolinite were not easily dissolved to aqueous solution, but may might be fixed on kaolinite surface. The desorption isotherms were well fitted with the Freundlich and Temkin equations in the case of short reaction and long reaction time, respectively. The desorption reaction was divided into the early fast reaction and the later slow reaction. The percentage of desorption generally decreased with increasing adsorbed P concentration and increasing desorption reaction time.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2005.06a
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• pp.485-495
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• 2005

This study was conducted to investigate sorption and desorption behaviors of radionuclides (Cobalt and Strontium) in natural soil. Sorption kinetics and isotherms were analyzed to predict sorption behaviors of radionuclides in natural soil and the experimental data were fitted to several sorption models. Desorption experiments were also performed with or without CMCD at constant pH and ion strength conditions. The results showed that $Sr^{2+}$ was more strongly sorbed than $Co^{2+}$ in natural soil. Both $Co^{2+}$ and $Sr^{2+}$ followed a pseudo-second order kinetics and Sips model. The desorption-resistance of $Co^{2+}$ and $Sr^{2+}$ was estimated using a natural surfactant Carboxymethyl-${\beta}$-cyclodextrin(CMCD) or non-desorbing fraction. Desorption of radionuclides was partially irreversible and $Sr^{2+}$ was more resistant than $Co^{2+}$ Addition of CMCD facilitated desorption of $Co^{2+}$ and $Sr^{2+}$ from soil.