• Journal of the Korean Wood Science and Technology
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• 제35권3호
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• pp.61-69
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• 2007

실내 공기질 향상을 목적으로 사용되는, 목탄과 모르타르 또는 천연 페인트가 혼합된 건축재료에 대한 포름알데히드 제거효과를 분석하기 위하여, 포름알데히드를 소정의 농도로 조절한 밀폐 용기에 이들 목탄계 건축자재를 넣고 일정시간 동안의 처리 과정을 거친 후 잔류 포름알데히드를 DNPH (2,4-Dinitrophenyl hydrazine) 카트리지를 통해 수집하고 HPLC 분석을 통해 잔류농도를 측정하여 목탄건축자재에 의한 포름알데히드 제거성능을 조사하였다. 목탄 및 목탄 바이오 모르타르의 포름알데히드 흡착 실험결과, 두 시료군 모두에서 목탄 5, 10, 15%를 함유한 시료의 단위중량 당 포름알데히드 제거량은 목탄을 함유하지 않은 시료에 비해 3배 이상 높았으며 포름알데히드 제거율은 약 80~90% 이상이었다. 수성 목탄 페인트의 포름알데히드 흡착 실험결과 또한 비슷하여, 목탄 15, 20, 25%를 함유한 시료의 단위중량 당 포름알데히드 제거량은 목탄을 함유하지 않은 시료에 비해 3배 가량 높았으며 포름알데히드 제거율은 90% 이상이었다. 포름알데히드는 목탄 제조 과정 중 목재의 리그노셀룰로스 성분의 구조변화로 인해 형성된 탄소 골격인 그라핀(Graphene)층 표면이나 가장자리에 형성된 흡착형 'O' 또는 'OH'관능기와 결합하여 흡착되는 것으로 판단된다.

• 한국환경과학회지
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• 제15권9호
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• pp.855-864
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• 2006

This study introduces a method to eliminate formaldehyde and benzene, toluene from indoor air by means of a photocatalytic oxidation reaction. In the method introduced, for the good performance of the reaction, the effect and interactions of the $TiO_2$ catalyst and ultraviolet in photocatalytic degradation on the reaction area, dosages of catalysts, humidity and light should be precisely examined and controled. Experiments has been carried out under various intensities of UV light and initial concentrations of formaldehyde, benzene and toluene to investigate the removal efficiency of the pollutants. Reactors in the experiments consist of an annular type Pyrex glass flow reactor and an 11W germicidal lamp. Results of the experiments showed reduction of formaldehyde, benzene and toluene in ultraviolet $/TiO_2/$ activated carbon processes (photooxidation-photocatalytic oxidation-adsorption processes), from 98% to 90%, from 98% to 93% and from 99% to 97% respectively. Form the results we can get a conclusion that a ultraviolet/Tio2/activated carbon system used in the method introduced is a powerful one for th treatment of formaldehyde, benzene and toluene of indoor spaces.

• Carbon letters
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• 제19권
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• pp.79-88
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• 2016

As a replacement for activated carbon, biochar was synthesized and used for the adsorptive removal of formaldehyde and nitrogen oxide. Biochar was produced from the fast pyrolysis of the red marine macro alga, Pyropia tenera. The P. tenera char was then activated with steam, ammonia and KOH to alter its characteristics. The adsorption of formaldehyde, which is one of the main indoor air pollutants, onto the seaweed char was performed using 1-ppm formaldehyde and the char was activated using a range of methods. The char activated with both the KOH and ammonia treatments showed the highest adsorptive removal efficiency, followed by KOH-treated char, ammonia-treated char, steam-treated char, and non-activated char. The removal of 1000-ppm NO over untreated char, KOH-treated char, and activated carbon was also tested. While the untreated char exhibited little activity, the KOH-treated char removed 80% of the NO at 50℃, which was an even higher NO removal efficiency than that achieved by activated carbon.

• Carbon letters
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• 제15권3호
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• pp.203-209
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• 2014

The adsorption of volatile organic compounds (VOCs) was carried out using an activated carbon fiber (ACF) filter in an automobile. The adsorption capacities of formaldehyde, toluene, and benzene on an ACF filter were far better than those of a polypropylene (PP) mat filter and combined (PP+activated carbon) mat filter by batch adsorption in a gas bag. In a continuous flow of air containing toluene vapor through an ACF packed bed, the breakpoint time was very long, the length of the unused bed was short, and sharp "S" -type breakthrough curve was plotted soon after breakpoint, showing a narrow mass transfer zone of toluene on the ACF. The adsorption amount of toluene on the ACF filter was proportional to the specific surface area of the ACF; however, the development of mesopores 2-5 nm in size on the ACF was very effective with regard to the adsorption of toluene. The ACF air clarifier filter is strongly recommended to remove VOCs in newly produced automobiles.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2010년도 춘계학술대회 논문집
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• pp.201-202
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• 2010

• 문화기술의 융합
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• 제6권3호
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• pp.449-456
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• 2020

새 집으로 이사를 가거나 집, 사무실 등의 벽지나 바닥재를 바꿨을 때, 인테리어 공사를 한 뒤에 나타날 수 있는 코를 찌르는 매캐한 냄새와 눈이 따가워지는 등의 현상이 새집증후군으로 새집을 장만한 기쁨을 누리는 것도 잠시 뿐이다. 새 건축물이나 새 가구에 사용되는 건축자재, 접착제, 벽지, 페인트 등에서 나오는 휘발성 유기화합물들은 거주자들의 건강과 실내 생활의 불쾌감을 유발시킨다. 이 휘발성 유기화합물들은 대표적 물질인 포름알데히드를 비롯하여 벤젠, 톨루엔, 아세톤, 스틸렌 등이 포함되어 있고 이러한 물질들은 장시간에 걸쳐 서서히 방출되어 거주자들에게 급성 또는 만성적인 질환을 야기한다. 유기 휘발성 물질들의 제거 방법으로는 흡착을 이용한 물리적 방법과 휘발성 물질을 다른 물질로 전환시키는 화학적 방법 또는 두 가지가 혼합된 방법이 주로 사용된다. 본 논고에서는 반응물질의 반응속도와 생성물의 방출을 제어하는 방법으로 얻어지는 서방형의 이산화염소 젤팩과 최적화된 홀 경을 가진 제올라이트 흡착제를 혼용하여 공기 중에 부유하는 포름알데히드를 흡착, 분해시켜 제거하는 효과적인 방법에 대하여 제안하는 바이다.

• 한국결정성장학회지
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• 제20권3호
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• pp.153-157
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• 2010

본 연구에서는 제강슬래그의 재활용 범위를 확대하기 위하여 제강슬래그를 접촉여재로 활용한 유기화합물의 흡 착성능을 평가하였다. 또한 표면에 미세한 기공을 가지고 있어 흡착여재와 여과필터로 많은 연구가 되어온 규조토를 제강 슬래그와 혼합하여 세라믹 여재를 만들고 유기화합물 흡착 특성을 평가하였다. 유기화합물로는 아세틸알데히드, 포름알데히드, 암모니아 기체를 사용하였으며, 각각 80%, 96%, 85%의 흡착 효율을 나타내었다. 사용된 모든 기체에 대해서 80% 이상의 흡착효율을 나타내어 흡착여제로의 활용 가능성을 확인할 수 있었다.

• 한국가구학회지
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• 제14권1호
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• pp.1-9
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• 2003

This research was carried out for packing materials and building materials to examine thylene gas adsorption and effect of keeping fruit fresh of wet formed charcoal-fiber mposite made from defibrated fiber of Pinus densiflora Sieb. et Zucc. and white charcoal from uercus variabilis Bl.(wood fiber: charcoal=8:2, 6:4, 4:6, 2:8), with/without phenol formaldehyde resin(PF, Non volatile content:$52\%$, resin content $1,3,5\%$). The results are summarized as follows: 1. The higher the charcoal content, the more the ethylene gas adsorption. At the same mixing ratio of fiber to charcoal, $\#100-200$ of charcoal particle size gave the better reslts than $\#60-100$. 2. Adding PF into the charcoal fiber composite decreased the capacity of ethylene gas adsorption but there was no significant difference until $5\%$ adding amount of PF. 3. For keeping fruit fresh for a long time, Charcoal fiber composite was $66\%$ longer than control. The higher the white charcoal content, the longer fresh time.

• 한국전기전자재료학회논문지
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• 제23권8호
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• pp.660-666
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• 2010

Carbon aerogels are promising materials as electrodes for electrical double layer capacitors (EDLCs). An optimum process is presented for synthesis of nanoporous carbon aerogels via pyrolyzing resorcinol-formaldehyde (RF) organic aerogels, which could be cost-effectively manufactured from RF wet gels. The major reactions between resorcinol and formaldehyde include an addition reaction to form hydroxymethyl derivatives ($-CH_2OH$), and then a condensation reaction of the hydroxymethyl derivatives ($-CH_2-$)- and methylene ether ($-CH_2OCH_2-$) bridged compounds. The textural properties of carbon aerogels obtained were characterized by nitrogen adsorption/desorption analysis and SEM and TEM. The application of the resultant carbon for electrodes of electric double layers capacitor (EDLC) in organic TEABF4/ACN electrolyte indicated that the ESR, as low as 55 $m{\Omega}$, was smaller than for commercially activated carbons. And EDLC with carbon Aerogel electrodes has an excellent stable more than for commercially activated carbons.

• Bulletin of the Korean Chemical Society
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• 제34권5호
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• pp.1513-1520
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• 2013

Novel chitosan (CS) based membrane networks were developed by solution casting and followed by crosslinking with different crosslinkers such as glutaraldehyde, urea-formaldehyde, and thiourea-formaldehyde. The developed membrane networks were designated as CS-GA, CS-UF and CS-TF. Crosslinking reaction of CS membranes was confirmed by Fourier transform infrared spectroscopy. Membrane rigidity and compactness were studied by the differential scanning calorimetry. The surface morphology of CS membranes was characterized by scanning electron microscopy. The sorption behaviour with respect to contact time, initial pH and initial metal ion concentration were investigated. The maximum adsorption capacity of CS-GA, CS-UF and CS-TF sorbents was found to be 1.03, 1.2 and 1.18 mM/g for $Cu^{2+}$ and 1.48, 1.55 and 2.18 mM/g for $Ni^{2+}$ respectively. Swelling experiments have been performed on the membrane networks at $30^{\circ}C$. Desorption studies were performed in acid media and EDTA and it was found that the membranes are reusable for the metal ion removal for three cycles. The developed membranes could be successfully used for the separation of $Cu^{2+}$ and $Ni^{2+}$ metal ions from aqueous solutions.