Thermostable Adsorption Filter Immobilized with Super Activated Carbons by Quinoline Soluble Isotropic Pitch Binder (I-a Novel Adsorption Filter)

Yeong-Tae Park,Chul-Gyou Im,Yeong-Tae Kim,Bo-Sung Rhee 한국탄소학회 2009 Carbon Letters Vol.10 No.3

Among other filters such as light filter, wave filter, air filter, ultra filter and filter paper, a novel adsorption filter from thermostable polyester nonwoven fabrics immobilized with functional super activated carbon by means of quinoline soluble, activateable isotropic pitch binder were developed in this study. The activated carbon precursor is available in the market branded as coconut shell based activated carbon(CCS-AC) produced by Dongyang Carbon Co. Ltd. BET-surface area of this precursor was 1,355 m2/g, after KOH-activation it increased over 2,970 m2/g and was named as super activated carbon. In the preliminary research, this precursor was impregnated with PdCl2(0.188 wt%) KMnO4(3 wt%) and redox-agent(CuCl2, 0.577 wt%) in order to promote TOF up to 100/h and Selectivity up 99% and patented as a functional AC for the ethylene adsorption. The enhancement of the isotropic pitch binder to the AC-immobilized adsorption filter was BET-surface area upgraded by 266 m2/g and promoted the Iodine- and MB-adsorption by 1.4 times, respectively and also micro pore wide ranges 〈 5a~30 a 〉.

탄소복합필터의 triacetin 함량 분석

김수호,고동균,김정열,이동욱,신창호,김종열,Kim Soo-Ho,Ko Dongkyun,Kim Chung Ryul,Lee Dong-Wook,Shin Chang-Ho,Kim Jong-Yeol 한국연초학회 2005 한국연초학회지 Vol.27 No.1

Glycerol triacetate(triacetin) is the currently used common plasticizer in the making filters from cellulose acetate tow. For the mono acetate filter, the determination of triacetin contents is already established by CORESTA recommended method (No. 59). But unfortunately, the analytical method of triacetin in the activated carbon filter have not reported so far. In this study, it was established the analytical method of carbon filter's triacetin contents at various extraction conditions, bath ratio and internal standard materials. The confidential level appeared above $95\%$ when the extraction time, ISTD material and bath ratio was 3 hours, tripropionin and below 500 mg activated carbon / 50 $m\ell$ ethanol, respectively. Also, in the distribution of triacetin with filter materials in activated carbon filters, the triacetin amount was the most contained in activated carbon. Therefore, this method can be applied to the determination of triacetin contents in the activated carbon filter.

Multidirectional evaluations of a carbon air filter to verify their lifespan and various performances

Lim, Tae Hwan,Yeo, Sang Young,Lee, So Hee Elsevier 2018 Journal of aerosol science Vol.126 No.-

<P><B>Abstract</B></P> <P>Carbon air filter, called cabin filter, has been used to remove harmful airborne particles and gases causing human disease. This filter is composed of nonwoven and meltblown layers with activated carbons and is widely employed for such purposes as automobile air conditioning. Here, a fiber binder adapted cabin filter was prepared to simplify the fabrication process, enhance the economic benefits, and improve the filtration and gas adsorption efficiencies of the cabin filter. It exhibited higher filtration and gas adsorption efficiencies than a conventional liquid binder adapted cabin filter. Furthermore, multidirectional evaluations of the filtration efficiencies were performed considering various aerosol types, various particle sizes, inclusion or exclusion of electrostatics, various gas adsorptions of the filter unit, and lifespan expectation through dust feeding. A quality factor was introduced to substantiate the filter performance by considering the correlation between pressure drop and particle penetration. The optimal weight of the meltblown layer was first selected as 20 g/m<SUP>2</SUP>, and it was confirmed that the mechanical and filtration properties of the fiber binder-adapted cabin filter were higher than those of a conventional cabin filter. An electro-charging effect was tested to demonstrate that it filled the efficiency vacancy under 1 µm and enhanced the filtration efficiency of the fiber binder adapted cabin filter compared with that of the uncharged cabin filter. Finally, the filter has a longer lifespan than the conventional one because it has more space to store dust. Overall, our research demonstrates a method to fabricate a fiber binder-adapted cabin filter and evaluates its performance via comprehensive evaluations.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We perform the multidirectional evaluations of air filter performance. </LI> <LI> We analyze synthetically the filter performance with various testing standards. </LI> <LI> Efficiency enhanced cabin air filter is prepared by our novel technique. </LI> <LI> The filter is considered not only efficiency but the processability and cost-effect. </LI> <LI> The method of lifespan expectation of cabin filter is suggested by laboratory scale test. </LI> </UL> </P>

Filter- and Denuder-Based Organic Carbon Correction for Positive Sampling Artifacts

Hwang, InJo,Na, Kwangsam Korean Society for Atmospheric Environment 2017 Asian Journal of Atmospheric Environment (AJAE) Vol.10 No.2

This study describes (1) the impact of positive sampling artifacts caused by not only a filter-based sampling, but also a denuder-based sampling in the determination of particle-phase organic carbon (POC), (2) the effect of sample flow rate on positive artifacts, and (3) an optimum flow rate that provides a minimized negative sampling artifact for the denuder-based sampling method. To achieve the goals of this study, four different sampling media combinations were employed: (1) Quartz filter-alone (Q-alone), (2) quartz filter behind quartz-fiber filter (QBQ), (3) quartz filter and quartz filter behind Teflon filter (Q-QBT), and (4) quartz filter behind carbon-based denuder (Denuder-Q). The measurement of ambient POC was carried out in an urban area. In addition, to determine gas-phase OC (GOC) removal efficiency of the denuder, a Teflon filter and a quartz filter were deployed upstream and downstream of the denuder, respectively with varying sample flow rates: 5, 10, 20, and 30 LPM. It was found that Q-alone sampling configuration showed a higher POC than QBQ, Q-QBT, and Denuder-Q by 12%, 28%, and 23%, respectively at a sample flow rate of 20 LPM due to no correction for positive artifact caused by adsorption of GOC onto the filter. A lower quantity of GOC was collected from the backup quartz filter on QBQ than that from Q-QBT. This was because GOC was not in equilibrium with that adsorbed on the front quartz filter of QBQ during the sampling period. It is observed that the loss of particle number and mass across the denuder increases with decreasing sample flow rate. The contribution o f positive arti facts to POC decreased with increasing sample flow rate, showing 29%, 25%, and 22% for 10, 20, and 30 LPM, respectively. The 20 LPM turns out to be the optimum sample flow rate for both filter and denuder-based POC sampling.

Triacetin이 탄소복합 필터의 연기성분 흡착능에 미치는 영향

김정열,신창호,김종열 한국연초학회 1998 한국연초학회지 Vol.20 No.2

This study was conducted to evaluate the effect of triacetin(TA) treatment during manufacturing carbon dual filter for the adsorption of cigarette smoke components by activated carbons. The measurements were carried out by separation of activated carbon from carbon dual filter, and the specific surface area analyzed. The specific surface area of activated carbon from the domestic cigarette filter and from the foreign cigarette filter by degassing at 9$0^{\circ}C$ was 163$\pm$32$m^2$/g, and 16.6$\pm$1.9$m^2$/g, respectively. Those values were very lower than that of degassing at 35$0^{\circ}C$ (Domestic brand: 952$\pm$30$m^2$/g, and Foreign brand: 847$\pm$73$m^2$/g). By comparing the adsorption capacity of acetone and benzene with and without triacetin treated activated carbon, there was a 20% reduction of adsorption capacity by 5% triacetin treatment. Also, from the cilia toxicity test with carbon dual filter treated 0 % TA and 8 % TA, the cilia survival time was 706$\pm$74sec. and 603$\pm$64sec. for 0% TA and 8% TA, respectively. The delivery rate of vapour phase of cigarette smoke, which consists of main components of cilia toxicity, was higher at 8% TA filter than 0 % TA filter. Our results indicate that the treated TA covered the micro-pore of activated carbon, and then reduced specific surface area, finally, decreased the adsorption of vapour phase from cigarette smoke.

Filter- and Denuder-Based Organic Carbon Correction for Positive Sampling Artifacts

황인조,나광삼 한국대기환경학회 2017 Asian Journal of Atmospheric Environment (AJAE) Vol.11 No.2

This study describes (1) the impact of positive sampling artifacts caused by not only a filter-based sampling, but also a denuder-based sampling in the determination of particle-phase organic carbon (POC), (2) the effect of sample flow rate on positive artifacts, and (3) an optimum flow rate that provides a minimized negative sampling artifact for the denuder-based sampling method. To achieve the goals of this study, four different sampling media combinations were employed: (1) Quartz filteralone (Q-alone), (2) quartz filter behind quartzfiber filter (QBQ), (3) quartz filter and quartz filter behind Teflon filter (Q-QBT), and (4) quartz filter behind carbon-based denuder (Denuder-Q). The measurement of ambient POC was carried out in an urban area. In addition, to determine gas-phase OC (GOC) removal efficiency of the denuder, a Teflon filter and a quartz filter were deployed upstream and downstream of the denuder, respectively with varying sample flow rates: 5, 10, 20, and 30 LPM. It was found that Q-alone sampling configuration showed a higher POC than QBQ, Q-QBT, and Denuder- Q by 12%, 28%, and 23%, respectively at a sample flow rate of 20 LPM due to no correction for positive artifact caused by adsorption of GOC onto the filter. A lower quantity of GOC was collected from the backup quartz filter on QBQ than that from Q-QBT. This was because GOC was not in equilibrium with that adsorbed on the front quartz filter of QBQ during the sampling period. It is observed that the loss of particle number and mass across the denuder increases with decreasing sample flow rate. The contribution of positive artifacts to POC decreased with increasing sample flow rate, showing 29%, 25%, and 22% for 10, 20, and 30 LPM, respectively. The 20 LPM turns out to be the optimum sample flow rate for both filter and denuderbased POC sampling.

필터 종류에 따른 Semi-volatile 화합물 이행 특성

김정열,신창호 한국연초학회 1997 한국연초학회지 Vol.19 No.2

Semivolatile components in mainstream smoke of cigarette attached the different type filter were analysed. Based on the main peak of GC profile, benzene, toluene, acetic acid, limonene, acetamide, pyridine, nicotine, phenol, pyrrole, and furfuryl alcohol were identified. The amount delivered of semivolatile components by each filter was evaluated with the ratio of areas of sample vs area% of ISTD. By comparing dual and triple filter to mono filter, the delivery amounts were 52% benzene, 62% toluene and 74% benzene, 84% toluene, respectively. The delivery amount of limonene which was known of tobacco taste component, were 52%, and 93% by dual and triple filter, respectively. Also, delivery amounts of acetic acid which was one of acidic compounds in smoke, were 86% and 83% by dual and triple filter, respectively. When adding the same amount of active carbon, the amounts delivered of vapour phase such as benzene and toluene by dual filter were lower than that of triple filter. But the delivery amounts of acetic acid and phenol by dual filter were higher than that of triple filter. This results assume that the pH of active carbon in filter affect to the adsorption or absorption of triacetin during filter making process.

용매열합성법으로 제작된 헤파필터/미세먼지 기반 탄소점의 특성 분석

정종원,양현경 한국물리학회 2021 새물리 Vol.71 No.7

Carbon dots were synthesized using a solvothermal method with a HEPA filter/fine dust as carbon sources. The chemical structure, particle size, surface chemical ligand, electronic structure and luminescent characteristics of the carbon dots were analyzed using transmission electron microscopy. Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and photoluminescence measurements, respectively. The photoluminescence spectrum of the carbon dots showed a strong cyan fluorescence around 452 nm under 370 nm excitation. Thus, high-efficiency carbon quantum dots using discarded fine dust can be developed, and the developed quantum carbon dots may be a good candidate for potential applications in the fields of LED color rendering improvement, fingerprint detection and anti-counterfeiting. 공기청정기용 헤파필터 폐기물을 이용하여 용매열합성법으로 탄소점을 제작하고. 제작되어진 탄소점의화학적 특성, 입자의 크기 및 형상, 입자 표면의 화학적 상태, 형광특성에 대하여 분석하였다. 전계 방사형투과전자현미경을 이용하여 입자의 크기 및 형상을 확인하였으며, 푸리에 변환 적외선 분광기를 통하여탄소점의 표면의 화학적 작용기에 대하여 분석하였다. 그리고 X-선 광전자 분광기를 이용하여 탄소점의표면 및 계면의 전자구조를 확인하였다. 에틸 알코올을 용매로 사용한 탄소점은 370 nm의 여기하에 452 nm의 중심파장을 가지는 시안색의 형광을 발광하는 것을 확인하였다. 버려지는 헤파필터와 미세먼지를탄소원으로 이용하여 탄소점의 제작이 가능하다는 것을 규명하였으며, 이러한 탄소점의 우수한 특성은LED의 연색성 개선, 태양전지 효율 향상, 지문 검출, 위 · 변조 방지용으로 활용이 가능할 것으로 기대된다.

탈취필터 내 첨착활성탄의 쏠림 형태와 충전율에 따른 탈취성능에 대한 실험

도수윤(Soo Yun Doh),김관택(Gwantaek Kim),윤백(Baek Youn),김현정(Hyunjung Kim),진유성(Yu-Sung Jin),문연진(Yeon-Jin Moon),김중호(Jung-ho Kim) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6

Removal of PM2.5 entering through the ventilation duct in an automobile using a carbon fiber ionizer-assisted cabin air filter

Park, Jae Hong,Yoon, Ki Young,Noh, Kwang Chul,Byeon, Jeong Hoon,Hwang, Jungho Elsevier 2010 Journal of aerosol science Vol.41 No.10

<P><B>Abstract</B></P><P>This study evaluated the charging characteristics of a carbon fiber ionizer for PM2.5 and carried out particle capture laboratory tests after an ionizer was installed upstream of the media of an electret cabin air filter. When the ion concentration per particle (<I>N</I><SUB><I>i</I></SUB>) of the carbon fiber charger was 10<SUP>6</SUP>ions/cm<SUP>3</SUP>, the average charge numbers for each particle were 1.54, 0.88, and 0.49 at 0.6, 1.2, and 1.8m/s of face velocity, respectively (the particle charging times, <I>τ</I>, were 167, 83, and 56ms, respectively). For these face velocities, the PM2.5 removal efficiencies of the filter media were 69.3%, 65.2% and 62.2%, respectively, but increased to 80.4%, 71.2% and 65.5%, respectively, when the ionizer was turned on. The carbon fiber ionizer was then installed in front of an electret cabin filter in the air conditioning system of an automobile, after which field tests were performed at a roadside area. For the same <I>N</I><SUB><I>i</I></SUB><I>τ</I> used in the lab-scale tests, the effects of the carbon fiber ionizer on increasing PM2.5 %Reduction were mild as 9.4%, 4.0%, and 2.8% when the flow rates were at the second, fourth, and sixth levels, respectively (the face velocities were 0.6, 1.2, and 1.8m/s, respectively). The PM2.5 %Reduction can be substantially increased by 20–21%, for a higher value of <I>N</I><SUB><I>i</I></SUB><I>τ</I> (=1.0×10<SUP>8</SUP>ions s/cm<SUP>3</SUP>), which is realized by increasing the power consumption of the carbon fiber ionizer.</P>