미분활성탄을 이용한 웰빙형 보드제조 및 흡착특성

강상준 ( Sang-jun Kang ),김기중 ( Ki-joong Kim ),최다영 ( Da-young Choi ),이명석 ( Myung-seok Lee ),정민철 ( Min-chul Chung ),안호근 ( Ho-geun Ahn ) 한국환경기술학회 2009 한국환경기술학회지 Vol.10 No.2

본 연구에서는 미분 활성탄과 숯에 바인더를 혼합하여 활성탄 보드를 성형하고, 흡착성능을 조사하여 실내 오염물질 제거용 흡착보드로의 활용가능성을 알아보았다. 흡착성능은 휘발성유기화합물(VOC)인 벤젠, 톨루엔 및 자일렌과 포름알데히드(HCHO)를 대상으로 하여 유통식 흡착장치에서 조사하였다. 제조한 활성탄 보드는 평균 세공크기는 거의 변화하지 않았지만, 미분활성탄과 숯의 혼합비율에 따라 비표면적과 세공부피와 같은 물리적 특성은 변화하였다. 이는 첨가된 숯이 혼합하는 과정에서 미세하게 파쇄되어 원료 활성탄의 미세세공에 침투하여 물성에 영향을 미치는 것으로 생각되었다. 활성탄 보드의 톨루엔에 대한 흡착성능은 원료 활성탄에 비해 다소 감소하였지만 미분활성탄 자체의 흡착성능 이상을 유지하였다. 흡착물질 중에서 톨루엔이 모든 활성탄보드에 가장 많이 흡착하는 결과를 보였다. 활성탄 보드의 흡착량과 물성과의 상관관계는, 다른 비율로 혼합한 미분활성탄과 숯의 영향으로 비슷한 세공구조를 가지지 못해 뚜렷하지 않았다. 결과적으로 입상활성탄에 미분활성탄과 숯을 적당량 혼합하여 제조한 활성탄 보드는 실내의 휘발성유기화합물과 포름알데히드를 제거하기 위한 친환경 흡착소재로 활용할 수 있음을 알았다. In this paper, well-being typed activated carbon sheets were prepared by mixing powdered activated carbon and charcoal with three types of granular activated carbon. The sheets were aimed to apply to removal of indoor pollutants. Adsorption performance of the sheets for benzene, toluene, xylenes, and formaldehyde was investigated using flow-typed experimental apparatus. Average pore size of the sheets did not change, but physical properties such as specific surface area and pore volume were changed according to the mixed amounts of powdered activated carbon and charcoal. This fact suggests that penetration of fine charcoal formed during its mixing process into micropore of granular activated carbon might change its physical properties. Adsorption performance of the sheets was not higher than that of granular activated carbon, but was over or similar to that of powdered activated carbon. The prepared sheets were most favorable to adsorption of toluene. Close correlation between adsorbed amounts and physical properties was not obtained because pore structure of the sheets did not similar to each other. As a result, it was considered that the activated carbon sheets prepared by mixing powdered activated carbon and charcoal properly could be used as an eco-material for improving indoor air quality.

액상 유기오염물질에 대한 폐커피가루의 흡착능력 평가

김슬기,나승민,손영규 한국습지학회 2016 한국습지학회지 Vol.18 No.1

최근 커피 이용량이 증가하면서 폐커피가루의 활용에 대한 관심이 환경공학 분야에서 높아지고 있다. 본 연구에서는폐커피가루를 재활용하여 오염물질에 대한 흡착제로서의 사용 가능성을 평가하기 위하여 액상의 유기 오염물질(메틸렌 블루)에 대한 흡착평형실험 및 흡착속도실험을 수행하였고, 입상활성탄 및 분말활성탄을 이용한 실험결과와 비교하였다. 실험 결과, 흡착평형의 경우 세 종류의 흡착제 모두 Langmuir 식에 잘 맞는 것으로 확인되었으며, 최대흡착량은 분말활성탄(178.6 mg/g), 폐커피가루(60.6 mg/g), 입상활성탄(15.6 mg/g) 순으로 확인되었다. 흡착속도실험에서도 유사 1차식 및 유사 2차식 모두에서 폐커피가루가 입상활성탄보다 우수한 것으로 확인되었다. 이는 폐커피가루의 입자 크기가 입상활성탄보다 작으며 표면이 입상 및 분말활성탄과 같이 다공성 특성을 띄고 있기 때문인 것으로판단되었다. The reuse of spent coffee powder has been researched for environmental engineering applications such as adsorbents of organic/inorganic pollutants. In this study adsorption equilibrium tests and adsorption kinetics tests for the removal of aqueous organic pollutant (methylene blue) were conducted using spent coffee powder, granular activated carbon, and powdered activated carbon. It was found that the maximum adsorption capacity of three adsorbents followed the order of powdered activated carbon (178.6 mg/g) > spent coffee powder (60.6 mg/g) > granular activated carbon (15.6 mg/g). The results of adsorption kinetics tests also indicated that spent coffee powder had higher kinetic parameters than granular activated carbon for pseudo 1st and 2nd order kinetics. The high performance of spent coffee powder might be due to its porous surface like those of granular and powdered activated carbons and smaller particle size comparing with granular activated carbon.

A Separator with Activated Carbon Powder Layer to Enhance the Performance of Lithium-Sulfur Batteries

Vu, Duc-Luong,Lee, Jae-Won The Korean Powder MetallurgyMaterials Institute 2018 한국분말재료학회지 (KPMI) Vol.25 No.6

The high theoretical energy density ($2600Wh\;kg^{-1}$) of Lithium-sulfur batteries and the high theoretical capacity of elemental sulfur ($1672mAh\;g^{-1}$) attract significant research attention. However, the poor electrical conductivity of sulfur and the polysulfide shuttle effect are chronic problems resulting in low sulfur utilization and poor cycling stability. In this study, we address these problems by coating a polyethylene separator with a layer of activated carbon powder. A lithium-sulfur cell containing the activated carbon powder-coated separator exhibits an initial specific discharge capacity of $1400mAh\;g^{-1}$ at 0.1 C, and retains 63% of the initial capacity after 100 cycles at 0.2 C, whereas the equivalent cell with a bare separator exhibits a $1200mAh\;g^{-1}$ initial specific discharge capacity, and 50% capacity retention under the same conditions. The activated carbon powder-coated separator also enhances the rate capability. These results indicate that the microstructure of the activated carbon powder layer provides space for the sulfur redox reaction and facilitates fast electron transport. Concurrently, the activated carbon powder layer traps and reutilizes any polysulfides dissolved in the electrolyte. The approach presented here provides insights for overcoming the problems associated with lithium-sulfur batteries and promoting their practical use.

분말활성탄을 혼합한 도료의 도장횟수에 따른 흡착 특성

최병철 ( Choi Byung-cheol ),경인수 ( Kyoung In-soo ),이상수 ( Lee Sang-soo ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1

Due to COVID-19, the spread of non-face-to-face culture is increasing the time spent indoors. Accordingly, it is necessary to reduce indoor air pollutants. Also, among building materials, there are paints. As the number of coatings increases, the coating film becomes thick, and there is a risk of cracking and falling off. Therefore, this study is to examine the adsorption properties of indoor air pollutants according to the number of coatings of a paint mixed with powdered activated carbon. In the experimental plan, the addition ratio of powdered activated carbon was selected as 30%, and the number of coatings was selected as primcoating, second coat, and finishing coat, and the concentration of formaldehyde and volatile organic compounds were measured. As a result, as the number of coatings increased, the concentration of formaldehyde and volatile organic compounds tended to decrease. This is considered to be due to the fact that not only the physical adsorption acted by the internal pores of the powdered activated carbon, but also because a lot of powdered activated carbon was present on the painted surface as the coating film was formed. However, since it is judged that there is an error in the concentration due to the inflow of external air as the chamber cover is opened to put the test object in the adsorption test process, it is considered that the experimental method needs to be supplemented.

활성탄을 이용한 역삼투 농촌수의 유기물 및 영양염류 제거 평가

주성희 ( Sung Hee Joo ),박종민 ( Jong Min Park ),이양우 ( Yang Woo Lee ) 한국물환경학회(구 한국수질보전학회) 2012 한국물환경학회지 Vol.28 No.3

Membrane process has been one of the widely applied wastewater treatment options, especially in field. However, one of the tricky issues in the process is to treat concentrates generated from reverse osmosis (RO) system in a manner of saving cost with maximum efficiency for treating a wide range of contaminants. Stimulated with the challenging issues, we have conducted a series of experimental studies in the evaluation for removing organics and nutrients using activated carbon. Results indicated that while powdered activated carbon (PAC) efficiently removed organics and the extent of removal was proportional to the PAC dosage, little removal of nitrogen and phosphorus was observed despite increasing the PAC dose. Interestingly, applying PAC was superior in removing organics than using granular activated carbon (GAC). These results suggest smaller particle size with higher surface area could provide greater chemical reactivity in removing organics.

분말활성탄 혼입률에 따른 수성도료의 특성

최병철 ( Choi Byung-cheol ),경인수 ( Kyoung In-soo ),이상수 ( Lee Sang-soo ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.2

Recently, as people's interest in environmental pollution increases, interest in indoor air pollution as well as outdoors is increasing. Accordingly, this study prepares functional paints by mixing powder activated carbon, which is a porous material, into aqueous paints, and examines the adsorption performance of volatile organic compounds (VOCs) and formaldehyde (HCHO). As a result of the experiment, the concentration of volatile organic compounds (VOCs) and formaldehyde (HCHO) tended to decrease as powder activated carbon was incorporated. It is believed that physical adsorption was achieved by the micropores of powdered activated carbon. However, in the adsorption test method, it is judged that the concentration was affected by the inflow of outside air as the chamber cover was opened to put the test object in the empty chamber where a certain concentration was maintained.

분말활성탄을 활용한 미세먼지 흡착형 경화체의 물리적 특성

이원규 ( Lee Won-gyu ),김연호 ( Kim Yeon-ho ),경인수 ( Kyoung In-soo ),이상수 ( Lee Sang-soo ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2

As the damage to fine dust increased, the Republic of Korea designated fine dust as a social disaster. The composition of the fine dust is composed of carbon, sulfate, nitrate, ammonium and minerals. The cause of fine dust is naturally generated by dirt, pollen, etc. In addition, there are artificial causes such as gaseous vehicle exhaust gas emitted from the use of fossil fuel. When fine dust enters the human body through breathing, it causes various respiratory diseases and skin diseases. In IARC, fine dust was designated as a carcinogen group 1. In this research, we tried to adsorb fine dust by physical adsorption using powdered activate carbon. Powdered activate carbon is a powdered activated carbon activated in a carbonized state. Porous material with high specific surface area and low density. Experimental items were tested for density, water absorption, and fine dust concentration according to the PAC addition ratio. Basic experiments were carried out to fabricate the fine dust adsorption matrix.

Graphene-like carbon을 활용한 산업폐수의 총유기탄소 제거연구

김송이(Song-i Kim),김동수(Dong-Su Kim),최예진(Ye-Jin Choi),양재규(Jae-Kyu Yang) 유기성자원학회 2023 유기성자원학회 학술발표대회논문집 Vol.2023 No.1

Adsorption of benzalkonium chlorides onto powdered activated carbon: mechanisms and detoxification

Tae-Kyoung Kim,Woo-Seok Choe,Taeyeon Kim,Seon-Ha Chae,Yu Sik Hwang,Kyung-Duk Zoh 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.6

Because disinfectants have been essential during the COVID-19 pandemic, the global demand for benzalkonium chlorides (BACs) has significantly increased. BACs can inactivate coronaviruses, but are known as toxic. In this study, we investigated the adsorption mechanisms of BAC12, BAC14, and BAC16 in water using powdered activated carbon (PAC). The effects of the reaction time, pH, and temperature on the adsorption kinetics of BACs were examined. The adsorption reaction followed pseudo-second-order kinetics, and better fitted to the Langmuir isotherm than the Freundlich isotherm. The best adsorption of BACs was achieved at neutral pH conditions. Thermodynamic analysis revealed that adsorption of BACs onto PAC is a spontaneous and endothermic process. Competitive adsorption experiments revealed that BACs with longer alkyl chains were adsorbed more effectively onto PAC than shorter alkyl chain BACs, implying that, while the electrostatic interaction is an important adsorption mechanism for BAC12, van der Waals interaction plays a more important role during the adsorption of BAC14 and BAC16. Finally, we observed the partial detoxification (69%) BAC in adsorption treated water with PAC using a Microtox test.

Hybrid Processes of Adsorption and Dissolved Air Flotation using Super-Powdered Activated Carbon and Powdered Activated Carbon

이영필,이재혁,노성희,이재욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1

Adsorption with activated carbons for water treatment is simple and cost effective. In addition, dissolved air flotation (DAF) process has advantages including short treatment time, small facility area, and easy to eliminate floating particles. Here, super-powdered activated carbon and activated carbon prepared from Miscanthus sacchariflorus (MS) were compared. For this, adsorption isotherm and kinetics data of methylene blue on porous carbons were obtained. Results showed that the experimental data were well fitted with Langmuir and pseudo-second-order-models, respectively. The flotation efficiency of superpowdered activated carbon and activated carbon powders was evaluated in DAF process under the wide range of pH 1 to pH 14. We found that the simultaneous removal of both porous carbon fine particles and organics (i.e., methylene blue) dissolved in water can be achieved by using the hybrid processes of adsorption-DAF.