축전식 탈염 공정을 위한 메조포러스 탄소 전극

이동주,박진수,Lee, Dong-Ju,Park, Jin-Soo 한국전기화학회 2014 한국전기화학회지 Vol.17 No.1

다공성의 활성탄소와 상대적으로 입자크기가 더 작은 carbon black을 여러 비율로 혼합하여 다양한 적층배열 구조를 갖는 축전식 탈염용 전극을 제조하였고 활성탄소만 존재하는 전극과 비교 분석하였다. 연구 결과 carbon black의 양이 증가할수록 탄소체의 배열 구조가 조밀해지는 것을 관찰하였고, mesopore가 약 10% 증가하는 것으로 나타났다. 순환전압전류법을 이용하여 축전용량을 살펴보았을 때 carbon black만으로는 이온흡착에 대한 영향이 거의 없지만 활성탄소체와 혼합하여 carbon black의 양이 증가할수록 비축전용량 역시 증가하는 것을 관찰하였다. 최종적으로 셀에 전극을 채용하여 탈염실험을 수행한 결과, carbon black의 양이 가장 많이 함유된 전극의 탈염 성능이 가장 우수하였고, pH의 변화의 폭이 가장 좁았다. 또한, 축전된 전하의 분석을 통해 비페러데이 전류의 비율이 증가하는 것으로 나타나 페러데이 반응에 대한 영향이 감소하는 것을 관찰하였다. 이는 carbon black의 첨가로 전극의 적층배열 구조가 변형함으로써 mesopore의 비율이 증가해 페러데이 반응에 의한 영향이 감소하였고, 탈염 성능 역시 증가하는 것을 알 수 있었다. Carbon electrodes for capacitive deionization were fabricated through mixing two different carbon powders (activated carbon powder, carbon black) with different particle sizes to investigate physical or electrochemical properties and finally desalination performances of the electrodes with various compositions of two carbon powders in weight and were compared with the electrode consisting of activated carbon. As a result, the electrode structure became more packed as increasing the amount of carbon black and resulted in 10% increase in mesopore fraction. The specific capacitance obtained from cyclic voltammograms of various electrodes showed that the electrode containing carbon black only had 107.4 F/g, while the specific capacitance of the electrode having more amount of carbon black increased and was higher than the one having no carbon black. The results of desalination runs in a capacitive deionization cell exhibited that the electrode having the highest amount of carbon black (1 wt%) in this study had the highest desalting efficiency, and no significant pH variation was observed during the runs. It was analyzed using accumulated charge that the fraction of non-Faraday current increased as the amount of carbon black increased in the electrodes. It can be concluded that the addition of carbon black changed the electrode structure resulting in an increase in the fraction of mesopore and finally enhanced the desalting efficiency by decreasing Faraday current.

유럽연합의 북극 지역 블랙카본 감축을 위한 노력과 전망

정혁 한국외국어대학교 EU연구소 2021 EU연구 Vol.- No.57

This research is purposed to delve into the EU’s policy efforts in reducing black carbon emissions in the Arctic region, and to identify and analyze and discuss the policy challenges so as to come up with potential solutions and to present the prosepct for the policy in the region. The black carbon, the second greatest contributor to the global warming in the Arctic region following carbon dioxide, is accelerating the melting of ice and snow in the region. The European Commission, well aware of the gravity of impacts from black carbon in the region, emphasizes complying the Gothenburg Protocol to the Convention on Long-Range Transboundary Air Pollution in the ‘An Integrated European Union Policy for the Arctic’, the most recent EU’s Arctic Policy. The EU’s National Emissions Ceiling Directive is established with the primary contents of the Protocol reflected in. However, with the Directive in effect from the year of 2020, it is too early for one to assess the effects of the policy at present. Hence, the European Union created fund for EUABCA project aimed to reduce emissions of black carbon in the Arctic region, And the intermediate result shows that enforcing obligation to report emissions of black carbon at national level in the Arctic, importance of estimation methodology with regard to build-up of the inventory, and the weakness of legal ground regarding the reduction of black carbon emissions. are the challenges with first priority to overcome. Hence, the European Commission needs to include in the EUETS Directive and the EU Effort Sharing Decision the provisions requiring the reporting of reduced emissions of black carbon. Along with that, adding provisions with reference to estimation methodology of black carbon emissions into the National Emissions Ceiling Directive should be another policy option to take into account. In addition to the considerations, enhancing the EU status to be formal observer in the Arctic Council helps EU raise its voice in the policy decision making process relevant to reducing emissions of black carbon in the Arctic. But, above all, it is unquestionably urgent for EU to set up the legal ground and framework at EU level, which requires the member states of the EU to set goals to reduce emissions of black carbon in primary black carbon emission areas, and to put in place adequate measures to implement them. 본 연구는 유럽연합의 북극 지역에서의 블랙카본 배출량 감축을 위한 정책상의 노력과 과제들을 파악, 분석 및 논의하면서 잠재적인 해결안들과 향후 관련 정책상의 전망을 제시하는 데 그 목적을 둔다. 북극 지역에서 블랙카본은 이산화탄소 다음으로 지구온난화 기여도가 높은 기후변화 가중원으로서 북극지역 빙설들의 해빙을 가속화시키고 있다. 유럽연합 집행위원회는 북극 지역에서의 블랙카본의 영향에 대한 심각성을 주지하면서 ‘장거리 초국경성 대기오염에 관한 협약의 괴텐버그의정서’ 준수를 유럽연합의 최근 북극정책인 ‘유럽연합의 북극종합정책’ 에서 강조한다. 유럽연합의 ‘특정 대기오염원 국가 배출량 최대 한계 지침’은 그 내용을 반영하면서 제정되었다. 하지만 2020년부터 발효 예정인그 지침의 효력은 현 시점에서 유럽연합의 북극 지역에서의 정책 효과를평가하기에는 다소 이른 감이 있다. 이에 유럽연합은 EUABCA 프로젝트기금을 조성하여 북극 지역에서 블랙카본 배출량 감축을 위한 프로젝트를 추진하고 있다. EUABCA 프로젝트의 중간 결과와 평가는 북극 지역국가들의 국가 차원에서의 블랙카본 배출량 보고의 의무화 강화, 인벤토리 구축 관련 배출량 산정 방법론의 중요성, 배출량 감축에 대한 법적 근거 미흡 등을 북극 지역 블랙카본 배출량 감축을 위한 우선 해결과제로제시한다. 이에 유럽연합 집행위원회는 블랙카본 관련 언급이 부재한 ’유럽연합 배출권거래제도 지침‘과 ’유럽연합 온실가스 감축 노력 분담 결정‘ 의 내용에 블랙카본 배출 감축량 보고의 공식적인 의무화 조항 마련을 추가해야 한다. 이와 함께 유럽연합의 ’특정 대기오염원 국가 배출량 최대한계 지침‘ 내 블랙카본 배출량 관련 산정 방법론에 관한 추가적인 조항마련도 필요할 것으로 판단된다. 아울러서 북극이사회 내에서의 유럽연합의 공식 옵서버로서의 지위 향상도 유럽연합의 북극 지역 블랙카본 배출량 감축과 관련한 정책의사결정과정에서 힘을 실어줄 수 있을 것으로 판단된다. 그러나 무엇보다도, 회원국 내 주요 블랙카본 배출부문들의 구체적인 블랙카본 배출량 감축 목표 설정과 적절한 조치 마련을 통한 그 목표 달성의 의무화를 위한 유럽연합 차원의 관련 법적 기반과 그 기본 틀 마련이 시급하다고 할 수 있을 것이다.

카본블랙의 표면개질이 중합토너의 특성에 미치는 영향

이은호 ( Eun Ho Lee ),김대수 ( Dae Su Kim ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.5

토너 입자 내부의 카본블랙의 분산성이 우수한 스타이렌 기반 현탁중합토너를 제조하기 위하여 카본블랙의 표면을 개질하였다. 산화반응을 통해 카본블랙 표면에 도입된 히드록시기와 유기산(올레산, 팔미트산, 아크릴산)의 카르복시기사이의 에스터화 반응을 통해 표면이 유기화 개질된 카본블랙을 제조하였다. 카본블랙의 표면개질을 확인하기 위하여 FTIR을 이용하였다. 바인더 수지 모노머 혼합물에 대한 카본블랙의 가시적인 분산성 실험을 진행하였으며 입도분석기를 이용해 분산된 카본블랙의 입자 크기를 측정하였다. 광학현미경 사진을 분석한 결과 표면이 올레산으로 개질된 카본블랙을 사용할 경우 토너 입자 내부의 카본블랙의 분산성이 크게 향상되었다. 올레산으로 개질된 카본블랙을 이용해 제조한 중합토너는 입경 및 입경분포도 토너로서 이상적이었다. Carbon black was surface-modified to prepare styrene-based suspension polymerized toner with excellent carbon black dispersibility inside toner particles. Carbon black was oxidized first to introduce hydroxyl groups on the surfaces, then esterification between the hydroxyl groups and carboxyl groups of organic acids (oleic acid, palmitic acid, acrylic acid) was followed to obtain organically surface-modified carbon black. The surface-modification of carbon black was confirmed by FTIR. Apparent carbon black dispersibility in the monomer mixture of the binder resin was tested and the particle size of dispersed carbon black was measured by particle size analyzer. Optical micrographs showed that carbon black dispersibility inside toner particles was improved considerably when the carbon black surfacemodified with oleic acid was used. The polymerized toner prepared with the carbon black surface-modified with oleic acid showed ideal particle size and size distribution as a toner.

대기 중 블랙카본 입자의 변성이 기후변화에 미치는 영향

박영권 ( Young-kwon Park ),박성훈 ( Sung-hoon Park ) 한국환경기술학회 2011 한국환경기술학회지 Vol.12 No.1

본 연구에서는 블랙카본의 변성이 기후변화에 미치는 영향에 대한 연구를 수행하고자 블랙카본의 변성 과정을 설명할 수치모델을 포트란 서브루틴의 형태로 개발하고 이를 대기질 모델과 결합하였다. 대기질 모델링 결과에 따르면, 변성이 진행됨에 따라 소수성이던 블랙카본이 친수성 입자의 일부로 편입되고 이에 따라 구름 형성 과정에 참여함으로써 습식침적률이 크게 증가하며, 대기 중 블랙카본 농도는 감소하는 것으로 나타났다. 블랙카본 입자를 소수성 및 친수성으로 가정했을 때 예측된 블랙카본의 직접복사강제력은 각각 0.11, 0.15 W/㎡로 나타났다. 한편, 변성 모델을 적용할경우에는 직접복사강제력이 0.12 W/㎡로 추정되었다. 변성된 블랙카본은 변성되지 않은 경우에 비해 1.36배 높은 직접복사강제력을 보였는데, 이는 문헌상에서 보고된 2배보다 낮은 값이다. 현재 많은 기후 모델에서 사용하고 있는 친수성 가정은 변성과정의 무시로 인해 블랙카본의 평균 직접복사강제력을 27% 과대평가하는 것으로 나타났다. A computational scheme for aging of black carbon developed as a set of Fortran subroutines was incorporated into a regional air quality model in order to investigate the impact of black carbon aging on its climate impact. Aging converted hydrophobic black carbon into an ingredient of hygroscopic particles so that they could participate in cloud processes. Wet deposition rate of black carbon significantly increased as a result of aging leading to lower atmospheric burden of black carbon. The average direct radiative forcing of black carbon over the spatial domain of this study was estimated to be 0.11 and 0.15 W/㎡ when black carbon particles were assumed to be hydrophobic (not aged) and hygroscopic(aged), respectively. When the aging scheme was applied, the direct radiative forcing was estimated to be 0.12 W/㎡. The direct forcing of aged black carbon was 1.36 times larger than that of non-aged black carbon, which is smaller than the factor of 2 reported in the literature. The hygroscopic assumption, which is frequently employed in climate modelling, led to a 27% overestimate of the averaged direct radiative forcing of black carbon because of the neglect of aging.

Comparison of Toxicity and Deposition of Nano-Sized Carbon Black Aerosol Prepared With or Without Dispersing Sonication

Mingu Kang,Cheol-Hong Lim,Jeong-Hee Han 한국독성학회 2013 Toxicological Research Vol.29 No.2

Nanotoxicological research has shown toxicity of nanomaterials to be inversely related to particle size. However, the contribution of agglomeration to the toxicity of nanomaterials has not been sufficiently studied, although it is known that agglomeration is associated with increased nanomaterial size. In this study, we prepared aerosols of nano-sized carbon black by 2 different ways to verify the effects of agglomeration on the toxicity and deposition of nano-sized carbon black. The 2 methods of preparation included the carbon black dispersion method that facilitated clustering without sonication and the carbon black dispersion method involving sonication to achieve scattering and deagglomeration. Male Sprague-Dawley rats were exposed to carbon black aerosols 6 hr a day for 3 days or for 2 weeks. The median mass aerodynamic diameter of carbon black aerosols averaged 2.08 μm (for aerosol prepared without sonication; group N) and 1.79 μm (for aerosol prepared without sonication; group S). The average concentration of carbon black during the exposure period for group N and group S was 13.08 ± 3.18 mg/m³ and 13.67 ± 3.54 mg/m³, respectively, in the 3-day experiment. The average concentration during the 2-week experiment was 9.83 ± 3.42 mg/m³ and 9.08 ± 4.49 mg/m³ for group N and group S, respectively. The amount of carbon black deposition in the lungs was significantly higher in group S than in group N in both 3-day and 2-week experiments. The number of total cells, macrophages and polymorphonuclear leukocytes in the bronchoalveolar lavage (BAL) fluid, and the number of total white blood cells and neutrophils in the blood in the 2-week experiment were significantly higher in group S than in normal control. However, differences were not found in the inflammatory cytokine levels (IL-1β, TNF-α, IL-6, etc.) and protein indicators of cell damage (albumin and lactate dehydrogenase) in the BAL fluid of both group N and group S as compared to the normal control. In conclusion, carbon black aerosol generated by sonication possesses smaller nanoparticles that are deposited to a greater extent in the lungs than is aerosol formulated without sonication. Additionally, rats were narrowly more affected when exposed to carbon black aerosol generated by sonication as compared to that produced without sonication.

Comparison of Toxicity and Deposition of Nano-Sized Carbon Black Aerosol Prepared With or Without Dispersing Sonication

Kang, Mingu,Lim, Cheol-Hong,Han, Jeong-Hee Korean Society of ToxicologyKorea Environmental Mu 2013 Toxicological Research Vol.29 No.2

Nanotoxicological research has shown toxicity of nanomaterials to be inversely related to particle size. However, the contribution of agglomeration to the toxicity of nanomaterials has not been sufficiently studied, although it is known that agglomeration is associated with increased nanomaterial size. In this study, we prepared aerosols of nano-sized carbon black by 2 different ways to verify the effects of agglomeration on the toxicity and deposition of nano-sized carbon black. The 2 methods of preparation included the carbon black dispersion method that facilitated clustering without sonication and the carbon black dispersion method involving sonication to achieve scattering and deagglomeration. Male Sprague-Dawley rats were exposed to carbon black aerosols 6 hr a day for 3 days or for 2 weeks. The median mass aerodynamic diameter of carbon black aerosols averaged $2.08{\mu}m$ (for aerosol prepared without sonication; group N) and $1.79{\mu}m$ (for aerosol prepared without sonication; group S). The average concentration of carbon black during the exposure period for group N and group S was $13.08{\pm}3.18mg/m^3$ and $13.67{\pm}3.54mg/m^3$, respectively, in the 3-day experiment. The average concentration during the 2-week experiment was $9.83{\pm}3.42mg/m^3$ and $9.08{\pm}4.49mg/m^3$ for group N and group S, respectively. The amount of carbon black deposition in the lungs was significantly higher in group S than in group N in both 3-day and 2-week experiments. The number of total cells, macrophages and polymorphonuclear leukocytes in the bronchoalveolar lavage (BAL) fluid, and the number of total white blood cells and neutrophils in the blood in the 2-week experiment were significantly higher in group S than in normal control. However, differences were not found in the inflammatory cytokine levels (IL-$1{\beta}$, TNF-${\alpha}$, IL-6, etc.) and protein indicators of cell damage (albumin and lactate dehydrogenase) in the BAL fluid of both group N and group S as compared to the normal control. In conclusion, carbon black aerosol generated by sonication possesses smaller nanoparticles that are deposited to a greater extent in the lungs than is aerosol formulated without sonication. Additionally, rats were narrowly more affected when exposed to carbon black aerosol generated by sonication as compared to that produced without sonication.

Synthesis of Carbon Black Modified and Their Carbon Color

Park Sooyoul,Lee Byungmin 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10

Due to the variety of shape and size of carbon black particles, carbon black can exhibit a range of color properties. The primary particle size, surface area and aggregate size determines the ultimate color with the dispersability of carbon black. An important property of carbon black is its ability to modify the visual appearance of other colors. The tinting strength is a measure of the effectiveness of the carbon black. In our works, carbon black was surface-modified to introduce hydroxyl groups or carboxyl groups such as organic acids (nitric acid, sulfonic acid) on the surface. The surface-modification of carbon black was confirmed by FTIR. Also, color properties of carbon black are measured using colorimeters and have values of L, a*, b*. The “Lab” value can be correlated to the ratio of particle size to surface area and is a useful tool for comparing competitive grades of carbon black. In now, carbon black is used in inkjet printer ink, reinforcements for natural and synthetic rubber, paints, coatings, cosmetics as a color materials.

[Retraction]Characterization of carbon black nanoparticles using asymmetrical flow field-flow fractionation (AsFlFFF)

Kim, Kihyun,Lee, Seungho,Kim, Woonjung The Korean Society of Analytical Sciences 2019 분석과학 Vol.32 No.3

High viscosity carbon black dispersions are used in various industrial fields such as color cosmetics, rubber, tire, plastic and color filter ink. However, carbon black particles are unstable to heat due to inherent characteristics, and it is very difficult to keep the quality of the product constant due to agglomeration of particles. In general, particle size analysis is performed by dynamic light scattering (DLS) during the dispersion process in order to select the optimum dispersant in the carbon black dispersion process. However, the existing low viscosity analysis provides reproducible particle distribution analysis results, but it is difficult to select the optimum dispersant because it is difficult to analyze the reproducible particle distribution at high viscosity. In this study, dynamic light scattering (DLS) and asymmetrical flow field-flow fractionation (AsFlFFF) analysis methods were compared for reproducible particle size analysis of high viscosity carbon black. First, the stability of carbon black dispersion was investigated by particle size analysis by DLS and AsFlFFF according to milling time, and the validity of analytical method for the selection of the optimum dispersant useful for carbon black dispersion was confirmed. The correlation between color and particle size of particles in high viscosity carbon black dispersion was investigated by using colorimeter. The particle size distribution from AsFlFFF was consistent with the colorimetric results. As a result, the correlation between AsFlFFF and colorimetric results confirmed the possibility of a strong analytical method for determining the appropriate dispersant and milling time in high viscosity carbon black dispersions. In addition, for nanoparticles with relatively broad particle size distributions such as carbon black, AsFlFFF has been found to provide a more accurate particle size distribution than DLS. This is because AsFlFFF, unlike DLS, can analyze each fraction by separating particles by size.

Properties of Carbon Black/SBR Rubber Composites Filled by Surface Modified Carbon Blacks

Shuang-Ye Dai,Ge-You Ao,Myung-Soo Kim 한국탄소학회 2007 Carbon Letters Vol.8 No.2

Properties of carbon blacks and carbon black/SBR rubber composites filled by surface modified carbon blacks were examined. Although the specific surface area of carbon blacks increased after the surface modifications with heat, acid, and base, there were no obvious changes in resistivity. The composites filled by heat treated carbon blacks showed a higher tensile strength and elongation than those filled by raw blacks. The acid and base treated carbon blacks filled composites also showed higher tensile strength but similar elongation values with those filled by raw blacks. With increasing loading ratio, both tensile strength and elongation increased, and appeared a maximum value at 30-40 phr. Modulus at 300% strain remained increasing with further loading of carbon blacks. At the same loading, the heat treated black filled composites showed similar modulus values with composites filled by raw blacks but for base and acid treated black filled composites much higher values were obtained. After the surface modification, the functional groups which played an important role in reinforcement action were changed.

Surface Modification of Carbon Black by Oleic Acid for Miniemulsion Polymerization of Styrene

한혜경,이정우,박동화,심상은 한국고분자학회 2010 Macromolecular Research Vol.18 No.5

To carry out miniemulsion polymerization of styrene in the presence of carbon black, carbon black was hydroxylated using potassium permanganate with the aid of a phase transfer catalyst, tetrabutyl ammonium bromide (TBABr). The hydroxylated carbon black was further reacted with oleic acid. The surface modification of carbon black with oleic acid was confirmed by FTIR, XPS, and TEM. The oleic acid-coated carbon black was successfully microencapsulated by polystyrene using miniemulsion polymerization. Polymerization failed when pristine carbon black was used. However, satisfactory conversion (> 96%) was achieved using the oleic acidmodified carbon black. The existence of a polystyrene layer was confirmed by TEM. In contrast the pristine carbon black, the oleic acid-coated carbon black did not act as a radical scavenger during polymerization.