• Proceedings of the Korean Environmental Sciences Society Conference
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• 2008.11a
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• pp.124-126
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• 2008

활성탄 흡착설비에서는 활성탄에 대한 차압특성 및 활성탄 층에서의 적절한 유동분포가 이루어져야 활성탄층에서의 고른 흡착분포를 보이게 된다. 즉, 흡착설비로 주입된 VOCs 가스는 활성탄층를 통과할 때 활성탄층 전 영역에서 고르게 유량이 분배되면서 통과를 해야만 활성탄의 파과시간과 교체주기가 같게 된다. 따라서 고안된 활성탄 카트리지 및 흡착설비가 이러한 고른 유동분포를 갖는지를 먼저 해석하였다. 본 연구에서는 기존에 VOCs 흡착제로 쓰이고 있는 활성탄에 대한 차압특성을 알아보고 차압에 따른 유동장을 해석하여 유입된 VOCS를 포함한 오염가스가 활성탄층에 고르게 분포되는가를 해석하였다. 이러한 결과를 토대 활성탄 카트리지내의 구조에 따른 활성탄의 높이 및 양을 제시하였다.

• Proceedings of the Korea Association of Crystal Growth Conference
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• 1997.10a
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• pp.99-103
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• 1997

활성탄의 특성을 이용하여 상업적으로 문제시되고 있는 수질 및 공기 정화용 항균성 Ag-활성탄을 제조하여 흡착특성, 표면구조 및 박테리아 저항성에 대하여 조사하였다. 높은 비표면적을 가진 활성탄에 대하여 AgNO$_3$를 사용하여 Ag-활성탄을 제조하였다. 0.1에서 1.0까지의 AgNO$_3$ 몰농도에 침적된 Ag-활성탄의 비표면적 값은 874-1475 $m^2$/g의 범위에 분포하고 있었으며, AgNO$_3$몰농도가 증가함에 따라 비표면적이 작아지는 경향을 나타내어 흡착된 Ag가 원료 활성탄의 표면구조에 영향을 주었다. Ag는 활성탄 표면의 기공 주위에 고르게 분포되었으며 활성탄의 표면에 물리적 흡착에 의해 존재하는 것으로 나타났다. 항균실험을 위하여 박테리아로서 대장균의 일종인 Escherichia coli를 사용하였으며, 흡착된 Ag의 양이 증가됨에 따라 활성의 범위가 증가되었고, Ag가 흡착되지 않은 활성탄의 경우에 있어서는 활성을 전혀 나타내지 않았다.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.4
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• pp.401-408
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• 2008

Adsorption performance of sulfonamide antibiotic compounds such as sulfadimethoxine(SDM), sulfachloropyridazine(SCP), sulfamethazine(SMT), sulfathiazole(STZ) and sulfamethoxazole(SMX) on granular activated carbon(GAC) was evaluated in this study. The coal-based activated carbon was found to be more effective than other carbons in adsorption of sulfonamide antibiotic compounds. The wood-based activated carbon was less effective than coconut- and coal-based carbon in adsorption nevertheless having larger pore volume and specific surface area than others carbons. The maximum adsorption capacities(X/M) of coal-based activated carbon for the five sulfonamide species was 1.3$\sim$1.5 and 1.8$\sim$2.1 times larger than coconut- and wood-based activated carbon, respectively. Carbon usage rates (CUR) of coal-, coconut- and wood-based activated carbons for SCP were 3.55 g/day, 4.29 g/day and 6.47 g/day, respectively. Similar results were obtained in the adsorption of the rest four sulfonamide species. It is concluded that coal-based activated carbon could removed the sulfonamide antibiotic compounds better than other material-based activated carbons.

• Clean Technology
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• v.27 no.2
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• pp.160-167
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• 2021

This study investigated the environmental effects of improving the general-type activated carbon adsorption tower used at the Sihwa/Banwol Industrial Complex with use of a cartridge-type activated carbon adsorption tower for the application of an activated carbon co-regenerated system. Four general-type activated carbon adsorption towers and two cartridge-type activated carbon adsorption towers were selected to analyze the properties of activated carbon and to compare the efficiency of reducing environmental pollutants. The results showed that the activated carbon used in the cartridge-type activated carbon adsorption towers was high quality activated carbon with an iodine adsorption force of more than 800 mg/g and that a good adsorption performance was maintained within the replacement cycle. From an analysis of the environmental pollutant reduction efficiency, it was confirmed that the cartridge-type activated carbon adsorption tower functioned properly as a prevention facility for handling emissions pollutants with a treatment efficiency of total hydrocarbons (THC), toluene, and methylethylketone (MEK) components of 71%, 77%, and 80%, respectively. The general activated carbon adsorption tower, which was confirmed to use low-performance activated carbon, had a very low treatment efficiency and did not function properly as a prevention facility for dealing with emission pollutants. It is believed that it is possible to reduce pollutants during operations by changing from the general-type activated carbon adsorption tower to a cartridge-type activated carbon adsorption tower.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.9
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• pp.925-932
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• 2008

Adsorption performance of tetracycline antibiotic compounds such as tetracycline(TC), oxytetracycline(OTC), chlortetracycline (CTC) and minocycline(MNC) on granular activated carbon(GAC) was evaluated in this study. The coal-based activated carbon was found to be more effective than other carbons in adsorption of tetracycline antibiotic compounds. The wood-based activated carbon was less effective than coconut- and coal-based carbon in adsorption nevertheless having larger pore volume and specific surface area than others carbons. The maximum adsorption capacities(X/M) of coal-based activated carbon for the four tetracycline species was 1.27$\sim$1.36 and 1.69$\sim$1.84 times larger than coconut- and wood-based activated carbon, respectively. Carbon usage rates(CUR) of coal-, coconut- and wood-based activated carbons for tetracycline(TC) were 2.96 g/day, 3.40 g/day and 4.53 g/day, respectively. Similar results were obtained in the adsorption of the rest three tetracycline species. It is concluded that coal-based activated carbon could removed the tetracycline antibiotic compounds better than other material-based activated carbons.

• Journal of Energy Engineering
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• v.4 no.1
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• pp.76-84
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• 1995

본 연구에서는 코코넛 껍질로부터 제조한 활성탄을 열 및 산소-암모니아의 혼합가스로 전처리하여 표면의 특성 변화와 이산화황 흡착능에 미치는 영향을 살펴보았다. 전처리한 활성탄으로 이산화황 흡착실험을 수행한 결과, 전처리한 활성탄은 기본 활성탄 시료보다 높은 흡착능력을 보였다. 본 연구의 전처리 실험에서는 산소와 암모니아를 주입하여 활성점을 제공하는 산소와 환원성 분위기를 조성하는 질소관능기를 도입하였다. 전처리 조건은 0∼25%의 암모니아와 473∼1273K의 온도이며 처리조건을 변화시킴으로써 표면 기능의 척도가 되는 세공구조와 원소조성 및 표면 관능기 등에 직접적인 영향을 주었다. 흡착능력은 고정층 반응기에서 전자 비틀림 저울로 이산화황 흡착량을 측정하여 비교하였고, 이 과정 중의 활성탄 표면의 특성변화를 원소분석, 승온탈착법, 산-염기 적정법, 주사현미경법 등의 분석 방법을 통해서 알아보았다. 그 결과, 이산화황의 최대 흡착 능력은 온도조건 973∼1173K에서 나타났다. 또한, 암모니아로 처리하지 않은 활성탄에 비하여 암모니아로 처리한 활성탄은 그 주입농도에 관계없이 이산화황의 흡착제거율을 약 48% 정도 향상시켰다.

• Clean Technology
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• v.28 no.4
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• pp.285-292
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• 2022

Adsorption tower systems based on activated carbon adsorption towers have mainly been employed to reduce the emission of volatile organic compounds (VOCs), a major cause of air pollution. However, the activated carbon currently used in these systems has a short lifespan and thus requires frequent replacement. An approach to overcome this shortcoming could be to develop metal oxide photocatalysis-activated carbon composites capable of degrading VOCs by simultaneously utilizing photocatalytic activation and powerful adsorption by activated carbon. TiO₂ has primarily been used as a metal oxide photocatalyst, but it has low economic efficiency due to its high cost. In this study, ZnO particles were synthesized as a photocatalyst due to their relatively low cost. Silver nanoparticles (Ag NPs) were deposited on the ZnO surface to compensate for the photocatalytic deactivation that arises from the wide band gap of ZnO. A microfluidic process was used to synthesize ZnO particles and Ag NPs in separate reactors and the solutions were continuously supplied with a pack bed reactor loaded with activated carbon powder. This microfluidic-assisted pack bed reactor efficiently prepared a Ag-ZnO-activated carbon composite for VOC removal. Analysis confirmed that Ag-ZnO photocatalytic particles were successfully deposited on the surface of the activated carbon. Conducting a toluene gasbag test and adsorption breakpoint test demonstrated that the composite had a more efficient removal performance than pure activated carbon. The process proposed in this study efficiently produces photocatalysis-activated carbon composites and may offer the potential for scalable production of VOC removal composites.

• Journal of Korean Society of Environmental Engineers
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• v.35 no.11
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• pp.815-820
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• 2013

The purpose of this research is to prepare the aluminum electrode coated with activated carbon for removing air pollution dust. The experiments were studied on the selection of optimal polymer for binding aluminum plate with powdered activated carbon, preventing the pore blocking of activated carbon from polymer binder, and the dust treatability for the prepared activated carbon electrode. The optimal adhesive for coating activated carbon on an electric aluminum plate was polyvinyl acetate (PVA) with vinyl functional group. For the opening of the blocked pore with polymer, it was very effective to embed polymer solvent in pore of activated catbon firstly before mixing activated carbon with PVA, and then to devolatilize the embedded solvent of carbon pore at high temperature. The mass of trapped dust on aluminum electrode coated with activated carbon was about double of the trapped one on just aluminum electrode.

• Applied Chemistry for Engineering
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• v.23 no.5
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• pp.490-495
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• 2012

The catalytic effect induced by activated carbon (AC) was evaluated during the phenol treatment using an ozone/AC ($O_{3}/AC$) process. In the case of the addition of AC to the ozone only process, the decomposition efficiency of dissolved ozone and phenol increased with increasing the amount of AC input. It was that the OH radical generated from the decomposition of dissolved ozone by AC had an effect on the removal of phenol. It was shown as the catalytic effect of AC ([$\Delta$phenol]/$[{\Delta}O_{3}]_{AC}$) in this study. The maximum catalytic effect was approximately 2.13 under 10~40 g/L of AC input. It approached to the maximum catalytic effect after 40 min of reaction with 10 and 20 g/L of AC input, while the reaction time reached to the maximum catalytic effect under 30 and 40 g/L of AC input was approximately 20 min. Moreover, the removal ratios of total organic carbon (TOC) for ozone only process and ozone/AC process were 0.23 and 0.63 respectively.

• Clean Technology
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• v.24 no.4
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• pp.287-292
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• 2018

Effect of physical property of activated carbon on its carbon dioxide adsorption was investigated for the effective control of carbon dioxide. Pinewood sawdust and coal were used as raw materials of activated carbon. Specific surface area, micropore volume and mesopore volume of the prepared activated carbons were determined, respectively. The prepared activated carbons were analyzed for their adsorption capacity of carbon dioxide. The adsorption capacity was then presented with respect to the surface area, micropore volume and mesopore volume, respectively. As a result, the specific surface area and micropore volume of both pinewood and coal activated carbon were highly related to its carbon dioxide capacity. Its mesopore volume hardly affected its carbon dioxide capacity. Preparation of activated carbon with high specific surface area and micropore volume was found to be critical to the effective control of carbon dioxide.