Innovative Climate Financing for a Just Transition in Africa

( Seoni Han ) 대외경제정책연구원 2023 KIEP Opinions Vol.270 No.0

Rapid and selective lithium recovery from desalination brine using an electrochemical system

Kim, Seoni,Joo, Hwajoo,Moon, Taegyun,Kim, Seung-Hyun,Yoon, Jeyong The Royal Society of Chemistry 2019 Environmental science Vol.21 No.4

<P>Due to the steep increase in the use of mobile electronics and electric vehicles, there has been a dramatic rise in the global lithium consumption. Although seawater is considered as an ideal future source of lithium, technological advances are necessary to ensure the economic feasibility of lithium recovery from seawater because the concentration and portion of Li<SUP>+</SUP> are extremely low in seawater. Especially, battery-based electrochemical systems for lithium recovery have been considered as promising lithium recovery methods, though they have not been considered for seawater applications due to the extremely low concentration of Li<SUP>+</SUP>. In this study, we demonstrate that an electrochemical system based on a battery electrode material (λ-MnO2) can be used for efficient lithium recovery from desalination brine (2-3 times concentrated seawater). Our approach was able to capture Li<SUP>+</SUP> within a substantially short period of time compared to conventional processes at a rate that was at least 3 times faster than that of adsorption processes, and our approach did not require acid or toxic chemicals unlike the other recovery technologies. Moreover, by consecutive operation of the system, a lithium recovery solution containing 190 mM of Li<SUP>+</SUP> was obtained with only a small consumption of energy (3.07 Wh gLi<SUP>−1</SUP>), and the purity of Li<SUP>+</SUP> was increased to 99.0%.</P>

Electrochemical lithium recovery and organic pollutant removal from industrial wastewater of a battery recycling plant

Kim, Seoni,Kim, Jiye,Kim, Seonghwan,Lee, Jaehan,Yoon, Jeyong The Royal Society of Chemistry 2018 Environmental science Vol.4 No.2

<P>Lithium has become one of the most important elements due to the rapid development of mobile devices and electronics lately. There has been a steep increase in the global demand for lithium, and developing an economic supply of lithium is thereby important for battery industries. This study presents a new method for recovering lithium in wastewater from battery recycling plants, in which a considerable amount of lithium (∼1900 mg L<SUP>−1</SUP>) is discarded. There was a significant amount of organic pollutants present in the wastewater (∼300 mg L<SUP>−1</SUP> of dissolved organic carbon), and so to resolve this, we proposed an electrochemical system containing a lithium-recovering electrode (lithium manganese oxide, LMO) and an oxidant-generating electrode (boron-doped diamond, BDD) to simultaneously recover lithium and decompose organic pollutants. Repeated operation of the electrochemical system demonstrated highly efficient and reliable lithium extraction and organic material removal from wastewater. After the lithium recovery system operation, a lithium-rich solution (98.6 mol% lithium among cations) was obtained, and the organic pollutants in the wastewater decreased by 65%. Furthermore, the electrochemical behavior of LMO and BDD was investigated under various operating conditions to provide useful insights into the industrial applications of our LMO/BDD system.</P>

피를 고분자의 전기화학 임피던스

차성극(Seony Keuck Cha) 경남대학교 기초과학연구소 1997 慶南大學校 基礎科學硏究所 硏究報告 Vol.11 No.-

4차 산업혁명 시대의 무용예술 활성화 방안에 관한 연구

윤선이(Yun seoni),조성희(Cho sung-hee) 한국콘텐츠학회 2023 한국콘텐츠학회 종합학술대회 논문집 Vol.2023 No.5

메타버스를 활용한 국내무용콘텐츠 사례분석

윤선이(Yun seoni),조성희(Cho sheong-hee) 한국콘텐츠학회 2022 한국콘텐츠학회 종합학술대회 논문집 Vol.2022 No.7

피롤과 아닐린 고분자 복합체의 전기화학적 성질

차성극,안병기,김경숙 慶南大學校 附設 基礎科學硏究所 1996 硏究論文集 Vol.8 No.-

피롤 고분자(ppy)와 아닐린 고분자(pan)의 두 성분으로 된 전극은 다공성이고 잘 배열된 피롤 고분자 피막내에 아닐린 고분자를 전기 화학적으로 중합하여 만들었는데, 이때 아닐린 고분자의 조성을 5∼18%정도 되게 했을때, 전도성과 도핑 준위등 전기 화학적 성질들이 크게 개선되었다. 또 이때 지지전해질을 KPF?로 하여 고분자 줄기상의 양이온 자체에 PF? 이온이 도핑되게 하였다. 이와 같은 pan고분자의 전기화학적 중합 반응의 속도 상수를 pt, pt/ppy 및 pt/pan전극에 대해 회전 전극을 써서 측정하였는데, 그 중합속도가 pt/ppy전극일때가 2.67×10?㎝/s로 가장 빠르게 나타났다. 이것은 백금 위에 pan고분자를 2∼3겹 입힌 전극위에서 다시 pan고분자를 중합할때의 속도보다 백배 정도 큰 값이었다. 이렇게 합성한 ppy-pan고분자의 도핑준위는 52%, 충-방전 효율은 88% 그리고 전도도는 다섯배 만큼 크게 나타났다. 그러나 총 방전 횟수는 피롤 고분자만으로 된 전극의 75% 수준이었다. Bi-polymer film electrode consisting of poly pyrrole(ppy) and poly aniline(pan) was preparded by electrochemical implantation in the porous and oriented ppy polymer matrix with pan polymer levels of 5∼18% in order to improve the electrical properties. The rate constants of these electropolymerization reaction were measured with rotating disk electrode formed by Pt, Pt/ppy, and Pt/pan electrode. The pan polymer on Pt/ppy of these was more rapidly polymerized than that of Pt/pan by a factor of hundred. The presence of pan polymer enhanced the doping level to 52%, the charging/discharging efficiency to 88%, and the conductivity by a factor of five. However, the cyclability was reduced by 75%, relative to ppy polymer alone.

Hybrid capacitive deionization to enhance the desalination performance of capacitive techniques

Lee, Jaehan,Kim, Seoni,Kim, Choonsoo,Yoon, Jeyong The Royal Society of Chemistry 2014 ENERGY AND ENVIRONMENTAL SCIENCE Vol.7 No.11

<P>Based on a porous carbon electrode, capacitive deionization (CDI) is a promising desalination technology in which ions are harvested and stored in an electrical double layer. However, the ion removal capacity of CDI systems is not sufficient for desalting high-concentration saline water. Here, we report a novel desalination technique referred to as “hybrid capacitive deionization (HCDI)”, which combines CDI with a battery system. HCDI consists of a sodium manganese oxide (Na<SUB>4</SUB>Mn<SUB>9</SUB>O<SUB>18</SUB>) electrode, an anion exchange membrane, and a porous carbon electrode. In this system, sodium ions are captured by the chemical reaction in the Na<SUB>4</SUB>Mn<SUB>9</SUB>O<SUB>18</SUB> electrode, whereas chloride ions are adsorbed on the surface of the activated carbon electrode during the desalination process. HCDI exhibited more than double the ion removal sorption capacity (31.2 mg g<SUP>−1</SUP>) than a typical CDI system (13.5 mg g<SUP>−1</SUP>). Moreover, it was found that the system has a rapid ion removal rate and excellent stability in an aqueous sodium chloride solution. These results thus suggest that the HCDI system could be a feasible method for desalting a highly concentrated sodium chloride solution in capacitive techniques.</P> <P>Graphic Abstract</P><P>Based on a porous carbon electrode, capacitive deionization (CDI) is a promising desalination technology in which ions are harvested and stored in an electrical double layer. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4ee02378a'> </P>

Factors Affecting Smoking Cessation Success of Heavy Smokers Registered in the Intensive Care Smoking Cessation Camp (Data from the National Tobacco Control Center)

Hansol Yeom,임희숙,Jihyun Min,Seoni Lee,박윤형 질병관리본부 2018 Osong Public Health and Research Persptectives Vol.9 No.5

Objectives The purpose of this study was to investigate the factors involved in the success of smoking cessation in heavy smokers enrolled in an intensive care smoking cessation camp program. Methods Heavy smokers enrolled in the program were classified into a success (n = 69) or failure (n = 29) group, according to whether they maintained smoking cessation for 6 months after the end of the program. Demographics, smoking behaviors, and smoking cessation-related characteristics were analyzed. Results Statistically significantly more participants in the success group had a spouse (98.6%; p = 0.008) compared with participants in the failure group (82.8%). However, multivariate logistic regression analysis indicated that having a spouse was not an independent factor in smoking cessation (p = 0.349). A significant difference in the frequency of counseling between the success and failure groups was observed (p = 0.001), with 72.5% of those who received counseling on 3–5 occasions for 6 months after the end of program successfully quit smoking, indicating that those who received more counseling had a higher likelihood of smoking cessation success. This was confirmed as an independent factor by multivariate logistic regression (p < 0.005). Furthermore, a graduate school level of education or higher, indicated a statistically greater success rate compared to those that were less well educated (p = 0.043). This was also observed as a significant independent factor using multivariate logistic regression (p = 0.046). Conclusion Education level, marital status, and the number of counseling sessions were significant factors contributing to smoking cessation success.

A report of 35 unrecorded bacterial species isolated from sediment in Korea

Han, Ji-Hye,Baek, Kiwoon,Hwang, Seoni,Nam, Yoon Jong,Lee, Mi-Hwa The National Institute of Biological Resources 2020 Journal of species research Vol.9 No.4

A total of 35 bacterial strains were isolated from various sediment samples. From 16S rRNA gene sequence similarities higher than 98.7% and the formation of a robust phylogenetic clade with the closest species, it was determined that each strain belonged to independent and predefined bacterial species. No previous official reports have described these 35 species in Korea. The unrecorded species were assigned to 6 phyla, 10 classes, 18 orders, 23 families, and 31 genera. At the genus level, the unrecorded species were affiliated with Terriglobus of the phylum Acidobacteria, as well as with Mycobacterium, Rhodococcus, Kineococcus, Phycicoccus, Agromyces, Cryobacterium, Microbacterium, and Arthrobacter; Catellatospora of the class Actinomycetia; Lacibacter of the class Chitinophagia; Algoriphagus and Flectobacillus of the class Cytophagia; Flavobacterium and Maribacter of the class Flavobacteriia; Bacillus, Cohnella, Fontibacillus, Paenibacillus, Lysynibacillus, and Paenisporosarcina of the class Bacilli; Bradyrhizobium, Gemmobacter, Loktanella, and Altererythrobacter of the class Alphaproteobacteria; Acidovorax of the class Betaproteobacteria; Aliiglaciecola, Cellvibrio, Arenimonas, and Lysobacter of class Gammaproteobacteria; and Roseimicrobium of the class Verrucomicrobia. The selected strains were subjected to further taxonomic characterization, including Gram reaction, cellular and colonial morphology, and biochemical properties. This paper provides detailed descriptions of the 35 previously unrecorded bacterial species.