High CO adsorption capacity, and CO selectivity to CO₂, N₂, H₂, and CH₄ of CuCl/bayerite adsorbent

Cho, Kanghee,Kim, Jungsu,Park, Jong-ho,Jung, Taesung,Beum, Hee Tae,Cho, Dong-woo,Rhee, Young Woo,Han, Sang Sup Elsevier 2019 Microporous and mesoporous materials Vol.277 No.-

<P><B>Abstract</B></P> <P>We synthesized nanoporous CO-selective adsorbent composed of CuCl supported on bayerite. Before supporting the CuCl, the bayerite chemical was calcined at 623 K to increase the surface area to 469 m<SUP>2</SUP> g<SUP>−1</SUP>. The CuCl was highly dispersed on the activated bayerite via a thermal monolayer dispersion process. The highest CO adsorption capacity was achieved at an optimal temperature of 573 K and CuCl content of 30 wt%. Thus synthesized adsorbent exhibited a high CO adsorption capacity of 48.5 cm<SUP>3</SUP> g<SUP>−1</SUP> at 293 K, but a very low CO<SUB>2</SUB> adsorption capacity (2.89 cm<SUP>3</SUP> g<SUP>−1</SUP>), resulting in CO/CO<SUB>2</SUB> separation factor of 16.8. When the CuCl content increased to 36 wt%, the adsorbent exhibited much higher separation factor (35.5), although the CO adsorption capacity was somewhat smaller (41.6 cm<SUP>3</SUP> g<SUP>−1</SUP>). The CO adsorption capacity and CO/CO<SUB>2</SUB> selectivity of this adsorbent are larger than those of our previous CuCl/boehmite adsorbent showing CO adsorption of 34 cm<SUP>3</SUP> g<SUP>−1</SUP> and a CO/CO<SUB>2</SUB> separation factor of 12.4. The present adsorbent also shows very high selectivity for CO over H<SUB>2</SUB>, N<SUB>2</SUB>, and CH<SUB>4</SUB>. Therefore, this adsorbent is expected to show excellent CO separation performance for various industrial processes such as steam-reforming and steel-making which involve CO, CO<SUB>2</SUB>, H<SUB>2</SUB>, N<SUB>2</SUB>, and CH<SUB>4</SUB>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly selective CO adsorbent based on CuCl/bayerite composite was synthesized. </LI> <LI> Adsorbent exhibited very high CO/CO<SUB>2</SUB> selectivity. </LI> <LI> High separation ability is attributed to the large surface area of bayerite. </LI> <LI> Thermal treatment conditions for dispersion of CuCl on bayerite were optimized. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Removal of carbon dioxide by absorption into blended amines: kinetics of absorption into aqueous AMP/HMDA, AMP/MDEA, and AMP/piperazine solutions

Choi, Won-Joon,Cho, Ki-Chul,Lee, Sang-Sup,Shim, Jae-Goo,Hwang, Hye-Ryun,Park, Sang-Wook,Oh, Kwang-Joong Royal Society of Chemistry 2007 GREEN CHEMISTRY Vol.9 No.6

<P>The emissions of anthropogenic carbon dioxide (CO<SUB>2</SUB>) are believed make a significant impact on global climate change. Hence, amine chemical absorption technology has been suggested to separate and recover CO<SUB>2</SUB>. In this study, reaction rate constants between CO<SUB>2</SUB> and blended amines were determined by measuring their absorption rate for CO<SUB>2</SUB>. The experiments were carried out to investigate the characteristics of CO<SUB>2</SUB> absorption by using additional absorbents such as hexamethylenediamine (HMDA), <I>N</I>-methyldiethanolamine (MDEA) or piperazine blended into 2-amino-2-methyl-1-propanol (AMP) in an agitated vessel. The absorption rates of CO<SUB>2</SUB> into aqueous blended amine solutions were measured. Additive concentrations of 1, 3, and 5 wt% were added for each 30 wt% AMP solution. The results showed that the addition of HMDA, MDEA or piperazine into AMP increased the absorption rate as compared to AMP alone. Of these additives, HMDA showed the most enhancement in the reaction rate of AMP. The reaction rate constants of HMDA, MDEA and piperazine blended into AMP at 303–343 K were given by <I>k</I><SUB>H</SUB> = 3.84 × 10<SUP>10</SUP>exp(−5361/<I>T</I>), <I>k</I><SUB>M</SUB> = 6.60 × 10<SUP>9</SUP>exp(−4959/<I>T</I>), and <I>k</I><SUB>P</SUB> = 9.09 × 10<SUP>9</SUP>exp(−5058/<I>T</I>), respectively.</P> <P>Graphic Abstract</P><P>The addition of 1, 3, and 5 wt% HMDA, MDEA or piperazine into 30 wt% AMP increased the absorption rate as compared to AMP alone. The reaction rate constants of HMDA, MDEA and piperazine blended into AMP at 303–343 K were given by <I>k</I><SUB>H</SUB> = 3.84 × 10<SUP>10</SUP> exp(−5361/<I>T</I>), <I>k</I><SUB>M</SUB> = 6.60 × 10<SUP>9</SUP> exp(−4959/<I>T</I>), and <I>k</I><SUB>P</SUB> = 9.09 × 10<SUP>9</SUP> exp(−5058/<I>T</I>), respectively. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b614101c'> </P>

가중나무로부터 식물생장억제물질 glycine betaine의 분리

윤미선(Misun Yun),최정섭(Jung Sup Choi),조남규(NamKyu Cho),한상섭(Sang-sub Han),김성문(Songmun Kim) 한국잡초학회 2021 Weed & Turfgrass Science Vol.10 No.4

가중나무를 2013년 전라북도 전주 인근 야산에서 수집하여 음건한 후 methanol(MeOH)로 추출하고, 감압농축건조한 추출물을 유채(Brassica napus L.)를 대상으로 in vitro에서 seed bioassay를 수행한 결과 식물생장을 50% 억제하는 식물생장억제값(GR50)은 739 μg g<SUP>-1</SUP>이었다. 식물생장을 억제하는 생리활성물질을 분리하기 위하여 MeOH 추출물을 hexane, CH₂Cl₂, EtOAc, butanol, H₂O로 순차분획하고 GR50을 조사한 결과 EtOAc 분획물의 억제효과가 가장 컸으며(561 μg g<SUP>-1</SUP>), EtOAc 분획물을 thin layer chromatography와 column chromatography로 5개의 분리물로 분리하고, 식물생장억제효과를 검정한 결과 EAC 분획물이 가장 높은 억제효과를 나타냈다(GR50 50 μg g<SUP>-1</SUP>). EAC 분리물을 gas chromatograph mass spectrometry로 분석한 결과 molecular ion (M+)이 m/z 117이고 fragmentaion은 m/z 116, 100, 72, 58이었다. EAC 분리물의 ¹H-NMR(nuclear magnetic resonance)분석결과 δ (ppm)에서 3.30 (9H, d, H-2, 3, 4), 3.85 (2H, s, H-1)에서 proteon signal을 확인하였으며, <SUP>13</SUP>C-NMR 분석결과 δ (ppm)은 52.39 (C-3, 3", 3""), 65.86 (C-2), 167.32 (C-1)에서 carbon signal을 확인하였다. GCMS, ¹H-NMR, <SUP>13</SUP>C-NMR의 분석결과 가중나무 EAC 분리물의 화학명은 1-carboxy-N,N,N-trimethyl이고, 일반명은 glycine betaine으로 확인되었다. Glycien betaie 화합물을 구입하여 유채(Brassica napus L.)를 대상으로 in vitro에서 seed bioassay를 수행한 결과 GR50값은 91 μg g<SUP>-1</SUP>으로 EAC 분리물의 GR50값과 유사하였다. Objective of this study is to discover new herbicide parent mother compound(s) from native plants in Korea. The leaves of Ailanthus altissima Swingle were collected in Jeonju, Jeollabukdo in 1995. The shade dried and powdered plant samples were extracted with methanol (MeOH). The methanol extract of A. altissima was subjected to in vitro seed bioassay on rapeseed (Brassica napus L.). The results indicated that the methanol extract significantly inhibited the germination of rapeseed with the GR50 (growth retardation 50%) value of 739 μg g<SUP>-1</SUP>. In order to isolate the bioactive substances that inhibit plant growth, the MeOH extract was sequentially fractionated with hexane, dichloromethane, ethyl acetate, butanol, and H₂O. Among them, the EtOAc fraction showed the lowest GR50 value (561 μg g<SUP>-1</SUP>) than other fractions. The EtOAc fraction was further fractionated on column chromatography, which showed 5 fractions (EAA-EAE) with good plant growth inhibitory effect. In these, the EAC fraction showed the highest inhibitory effect (GR50 at 50 μg g<SUP>-1</SUP>). The gas chromatography and mass spectrometry analysis of EAC fraction revealed that molecular ion (M<SUP>+</SUP>) was m/z 117 and fragment ions were m/z 116, 100, 72, and 58. Based on the results obtained from GC-MS, ¹H-NMR, and <SUP>13</SUP>C-NMR analyses, the EAC fraction was identified as 1-carboxy-N,N,N-trimethyl, and its common name was glycine betaine. The seed bioassay of glycine betain results revealed that the GR50 value was 91 μg g<SUP>-1</SUP>, which was comparable with the GR50 value of the EAC fraction of A. altissima.

Assessment of groundwater quality using statistical analysis in Incheon - focused on Gangwha area -

Hee-jong Yoo(유희종),Young-min Cho(조영민),Hye-rin Cho(조혜린),Sung-eun Min(민성은),Ji-hong Seong(성지홍),Hyun-sup Ha(하현섭),Mun-ju Kwon(권문주) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5

Naturally occurring radioactive materials (NORM) is widely distributed in groundwater of granite areas. Drinking of groundwater containing NORM such as uranium and radon is highly harmful to human health. The aim of this study is to determine the characteristics of groundwater quality with NORM and geostatistical analysis. Groundwater samples from 37 wells were collected and measured on 24 items of drinking water quality standards including radon and uranium in 2020. The average concentrations of uranium and radon in groundwater were the highest in granite area. Principal component analysis (PCA) showed that PC1 was highly enriched with Na⁺, K<SUP>+</SUP>, Mg²⁺, Ca²⁺, Cl^-, SO₄^2-, NO₃^-, HCO₃^- and Sr (40.6 %) strongly associated with soluble ion materials. Both PC2 with F^-, U and Gross alpha (20.3 %) and PC3 with Rn (8.5 %) was related to NORM. PC4 was enriched with Zn (7.0 %). Cluster analysis (CA) revealed three subgroups showing high relationship between Na⁺ and Cl^- of main soluble ion constituents in seawater. This study coupled with statistical analysis is expected to imply appropriate contamination control management for safety of drinking groundwater.

폴리비닐클로라이드 해양광생물반응기와 고밀도 폴리에틸렌 해양광생물반응기에서 미세조류, Tetraselmis sp. KCTC12236BP의 생산성 비교

정성균(Seung-Gyun Jung),김수권(Su-Kwon Kim),변문섭(Moon-Sup Bun),조용희(Yonghee Cho),신동우(Dong-Woo Shin),김지훈(Z-Hun Kim),임상민(Sang-Min Lim),이철균(Choul-Gyun Lee) 한국해양바이오학회 2016 한국해양바이오학회지 Vol.8 No.1

It is important to design photobioreactor by cheap material for economical microalgal biomass production. In this study, two types of marine photobioreactors (MPBR), made by either polyvinyl chloride (MPBR-PVC) or high density poly ethylene (MPBR-HDPE), are used and performance of these were compared. Tetraselmis sp. KCTC 12236BP is a green marine alga that isolated from Ganghwa Island, Korea, and the strain was used for marine cultivations using MPBR-PVC and MPBR-HDPE. The cultivations were performed three times in the spring season of 2012 using MPBR-PVC and of 2013 using MPBR-HDPE in the coastal area of Young Heung Island. As the results, MPBR-PVC shows higher biomass productivities than MPBR-HDPE, due to its high light transmittance. In the cultivations using MPBR-PVC, the average sea water temperature was 11.5°C during the first experiment and 16.5°C during the second and third experiments. Average light intensities during three times for experiments were 407.5, 268.1 and 273.0 μ·E·m<SUP>-2</SUP>·s<SUP>-1</SUP>, respectively. The maximum fresh cell weight and average biomass productivity were 1.2 g·L<SUP>-1</SUP> and 0.12 g·L<SUP>-1</SUP>·day<SUP>-1</SUP>. These results showed that Tetraselmis sp. KCTC12236BP were adapted well with the environmental conditions from ocean, and grow in the MPBR-PVC and MPBR-HDPE.

Antimicrobial effect of hypochlorous acid on pathogenic microorganisms

( Sang Phil Shin ),( Mun Sup Kim ),( Sung Hee Cho ),( Ji Hyung Kim ),( Casiano H Choresca Jr ),( Jee Eun Han ),( Jin Woo Jun ),( Se Chang Park ) 한국예방수의학회(구 한국수의공중보건학회) 2013 예방수의학회지 Vol.37 No.1

Disinfection is essential in terms of the public health or environmental hygiene. Hypochlorous acid (HOCI) solution was developed as a disinfectant in Korea. We evaluated the gemicidal activity of HOCI against various pathogenic microbes. Thirty-one ATCC strains were exposed to HOCI solution at various concentrations (20, 40 and 80 ppm) for 1 minute. All the strains of bacteria, yeasts and mycobacteria were killed at 80 ppm after exposure to HOCI. The results suggest that HOCI solution could be used to effectively disinfect public areas.

AN ALTERNATIVE APPROACH OF INPUT-OUTPUT TABLES TO DYNAMIC STRUCTURE CHANGES IN KOREAN IT INDUSTRIES

Cho, Byung-Sun,Cho, Sang Sup,Lee, Jungmann Vilnius Gediminas Technical University 2013 TECHNOLOGICAL AND ECONOMIC DEVELOPMENT OF ECONOMY Vol.19 No.2

<P>The structure of the IT industry has always evolved in line with technological progresses and changes in consumer preferences, as well as with regulatory trends. This is why, when assessing the effect that a new technology or industry policy may have on the national economy, companies and policy-makers need to consider dynamic structural changes affecting the IT industry. One of the most popular existing methods for economic impact analysis is based on a traditional input-output table, and is conducted over a period between the current time and a given time in the future. In this study, we compare the accuracy of RAS and Cross Entropy (CE), the two most widely employed methods for updating input-output (IO) tables, by applying them to Korean IT industries. The main results of this study are the following. In terms of the accuracy of input coefficient estimates, we have found that both the RAS and CE methods have a tendency to overestimate or underestimate them. When the Korean industry was first divided into fourteen sectors, and the RAS and CE methods were applied to each of the fourteen industries, it was difficult to discern a consistent trend for the two methods concerning their accuracy in estimation of input coefficients. Secondly, when used to update an IO table in which the IT industry is subdivided into IT equipment and services, neither the CE nor RAS method proved distinctly superior to the other. Third, in light of the above two findings, we concluded that updating IO tables is best done through a hybrid method combining the CE and RAS methods. This paper proposes a procedure consisting of two steps: IO tables are first updated using the two methods, which are once again updated by employing the OLS average approach through the use of optimal weights.</P>

Accurate Determination of Hydrogen Adsorption on Metal Materials Considering the Equations of State and its Influential Errors

Cho Won-Chul,Park Chu-Sik,Han Sang-Sup 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1

Adsorption isotherms of hydrogen by step-by-step method are widely used. However, the relations between the equations of state and the accumulated errors produced by step-by-step method and the mechanical errors of pressure or temperature controller were not analyzed. Considering the influence of various errors on the equations of state, we could find out the factors and compare the performance of the equations of state.

New Assessment of the N1-N2 Substaging in Stage Ⅲ Colorectal Cancer

Sung Wook Cho,Gyu Young Jeong,Ryung-Ah Lee,Kwang Ho Kim,Soon Sup Chung 대한외과학회 2010 Annals of Surgical Treatment and Research(ASRT) Vol.78 No.3

Purpose: The five-year survival rates of patients with stage Ⅲ colorectal cancer have been reported widely ranging from 22 to 69 percent. Hence, reliable substaging is important for the management of stage Ⅲ colorectal cancer patients. Therefore, we tried to assess the substages and investigate the possibility of other discriminating numbers for nodal substaging. Methods: The 381 patients with node-positive colorectal cancer who had undergone surgery, were retrospectively categorized by the number of positive nodes. The patients were grouped in five ways, and each grouping was divided into two subgroups according to the number of positive nodes. The subgroups of each grouping were as follows; in LN1 group, N1=1, N2>1; in LN2 group, N1=2, N2>2; in LN3 group, N1=3, N2>3; in LN4 group, N1=4, N2>4; in LN5 group, N1=5, N2>5. We compared the survival rate of each groups. Results: Node-positive patients had a five-year survival rate of 55.2 percent. The statistical differences between the N1 and N2 subgroups of each grouping were as follows: LN1 group (P=0.0128), LN2 group (P=0.0052), LN3 group (P=0.6268), LN4 group (P=0.1480), and LN5 group (P=0.6875). Conclusion: There were significant differences in the five-year survival rates between N1 and N2 in the LN1 group and LN2 group, but there were no differences between N1 and N2 in the other groupings. These data raise the possibility that a novel N1~N2 substaging (N1: 1~2; N2: >2) is superior to the current N1~N2 substaging (N1: 1~3; N2: >3).

국제사회 ; 한국 핵심고용산업(군)에 관한 연구

( Sang Sup Cho ),( Shin Won Kang ) 국제지역학회 2014 국제지역연구 Vol.18 No.2

경제에서 산업이 고용에 미치는 영향은 산업마다 이질적이다. 한 경제에서 고용창출에 가장 큰 영향을 미치는 산업을 핵심고용산업으로 볼 때, 핵심 고용산업의 순차적 선별방법과 네트워크방법을 적용한 핵심고용산업군의 선별은 일반적으로 다른 분석결과를 나타난다. 본 연구에서는 한국 2000년도와 2011년도 산업연관표를 적용하여 고용창출에 대한 핵심 산업과 핵심산업군을 선별하고, 이 분석결과에 대한 산업 정책적 시사점을 제시하였다. 본 분석결과는 다음과 같이 요약된다. 첫째, 2000년대에 한국 핵심 고용산업군은 대부분 서비스산업 부문에서 창출되고 있었다. 둘째, 제조업에서 핵심고용창출산업은 IT관련 전기 및 전자산업에서 발생하였다. 셋째, 2000년도 핵심고용산업은 순차적으로 핵심고용산업군을 구성하였으나, 2011년도의 분석에서는 2000년도에 비하여 핵심고용산업이 순차적으로 구성되지 않았다. 넷째, 각 핵심고용산업의 고용창출능력은 상대적으로 감소하였으나, 핵심고용산업군의 고용창출능력은 증대하였다. 마지막으로 복잡화되는 산업네트워크구조를 고려할 때, 한국 고용증대는 산업사이에 순차적 정책시행보다 동시적 정책시행이 중요하며, 산업사이에 효율적 협력체계유지가 매우 중요한 고용정책방향임을 보여준다. Economic impact on employment in the industry varies from industries. The greatest impact on job creation as a key industry of employment was assumed a key employment industry. Sequential screening of key employment industry and applying the network methodology to select a key employment industry cluster are showed generally different analysis results. In this study, the Korean Input-Output Tables for 2000 and 2011 was applied to screening the key industry and the key industry cluster. Results of this analysis are summarized as follows. First, the key employment industry cluster in the 2000s, were being created in the service sector in most. Second, the key employment industries in manufacturing was occurred in the IT-related and electronics industry. Third, in 2000, key employment industry was the key employment industry cluster sequentially. Fourth, employment-generating capacity of key employment industry decreased relatively. Lastly, considering the complicated Industrial network structure, for increased employment policies, simultaneous policy implementation is important rather than sequential policy enforcement between the industries.