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산업 현장에서 발생하는 슬러지 폐기물의 에칭과 재합성을 통한 실리카 나노입자의 제조
제갈석(Suk Jekal),김지원(Jiwon Kim),김하영(Ha-yeong Kim),김민정(Min-Jeong Kim),윤창민(Chang-Min Yoon) 유기성자원학회 2022 유기성자원학회 학술발표대회논문집 Vol.2022 No.추계
It is known that various types of chemical wastes including sludges are generated from the industrial fields. With the rapid growth of industry, disposal costs of chemical wastes are greatly increasing. In this study, we suggest a method to extract various silica particles from sludge wastes and converting into silanol precursor by etching process via ultra-sonication method using etchant such as ammonia solution. Various etching times were examined to maximize the extracting efficiency of silanol from the sludges. With the etching time of 8 h, the largest amount of silanol precursor were extracted. Subsequently, a simple sol-gel method is processed employing the silanol precursor, and silica nanoparticles with uniform size of 50 nm were successfully synthesized by sequential hydrolysis and condensation reaction. The results of this study verified the successful recycling method of sludge waste into silica nanoparticle, which may applicable in industry near future.
슬러지 폐기물을 활용한 반도체급 균일한 콜로이달 실리카 나노입자의 제조 및 CMP 응용
김동현,김지원,제갈석,김민정,김하영,김민상,김상춘,박선영,윤창민,Kim, Dong Hyun,Kim, Jiwon,Jekal, Suk,Kim, Min Jeong,Kim, Ha-Yeong,Kim, Min Sang,Kim, Sang-Chun,Park, Seon-Young,Yoon, Chang-Min 유기성자원학회 2022 유기물자원화 Vol.30 No.3
This study suggests the effective recycling method of sludge waste from various industrial fields to synthesize uniform colloidal silica nanoparticles. In detail, polymers are removed from the sludge waste to attain sludge-extracted silica (s-SiO<sub>2</sub>) micron-sized particles, and ammonia assisted sonication is applied to s-SiO<sub>2</sub>, which has effectively extracted the silanol precursor. The nano-sized silica (n-SiO<sub>2</sub>) particles are successfully synthesized by a typical sol-gel method using silanol precursor. Also, the yield amounts of n-SiO<sub>2</sub> are determined by the function of s-SiO<sub>2</sub> etching time. Finally, n-SiO<sub>2</sub>-based slurry is synthesized for the practical CMP application. As a result, rough-surfaced semiconductor chip is successfully polished by the n-SiO<sub>2</sub>-based slurry to exhibit the mirror-like clean surface. In this regard, sludge wastes are successfully prepared as valuable semicondutor grade materials.
궐련형 담배 바이오매스 기반의 슈퍼커패시터용 탄소의 제조 및 응용
김지원(Jiwon Kim),제갈석(Suk Jekal),김동현(Dong Hyun Kim),윤창민(Chang-Min Yoon) 유기성자원학회 2022 유기물자원화 Vol.30 No.2
본 연구에서는 궐련형 담배의 담뱃잎 바이오매스 폐기물을 수거하여 슈퍼커패시터용 활물질로 제조 및 응용하였다. 수거한 담뱃잎 폐기물을 질소 환경에서 다양한 온도(800/850/950°C)로 탄화하였으며, 탄소/산소 성분비(C/O ratio) 분석을 통해 850°C에서 가장 우수한 품질의 탄소 물질이 제조되었음을 확인하였다. 추가적으로 담뱃잎 기반의탄소 물질에 폴리피롤(Polypyrrole)을 저온중합법을 통해 코팅하여 전기화학적 성능을 향상시켰다. 탄소 물질(CTL-850) 과 폴리피롤을 코팅한 탄소 물질(CTL-850/PPy)을 기반으로 한 전극의 전기화학적 성능을 측정한 결과, -1.0-0.0V와0.0-1.0V의 전위창에서 각각 100.2F g-1@1 A g-1과 155.3F g-1@1 A g-1의 우수한 비정전용량(Specific capacitance)를나타내었다. 두 개의 전극을 활용하여 비대칭형 슈퍼커패시터 소자(Asymmetric supercapacitor device)를 제작하였으며, 제조한 비대칭형 CTL-850//CTL-850/PPy 소자는 2.0V의 구동전압 범위와 비정전용량(31.1F g-1@1 A g-1)을 가지고있음을 확인하였다. 또한, 제조한 슈퍼커패시터 소자의 방전을 통해 1.8V의 Red Led를 점등할 수 있음을 확인하였다. 본 연구 결과를 통해 바이오매스를 우수한 성능의 친환경 에너지 저장매체로 활용하는 후속 연구에 대한 방향성을제시할 수 있을 것으로 판단된다. In this study, heated tobacco biomass was prepared as an active material for supercapacitor device. Retrieved tobacco leaf from the heated tobacco was carbonized at various temperature(800/850/950°C). Carbonized tobacco leaf material synthesized at 850°C exhibited the highest C/O ratio, indicating the finest carbon quality. In addition, polypyrrole was coated onto the carbonized leaf material for increasing the electrochemical performance via low-temperature polymerization method. As-synthesized carbonized leaf material at 850°C(CTL-850)-based electrode and polypyrrole-coated carbonized leaf material(CTL-850/PPy)-based electrode displayed outstanding specific capacitances of 100.2 and 155.3F g-1 at 1 A g-1 with opertaing window of -1.0V and 1.0V. Asymmetric supercapacitor device, assembled with CTL-850 as the negative electrode and CTL-850/PPy as the positive electrode, manifested specific capacitance of 31.1F g-1(@1 A g-1) with widened operating voltage window of 2.0V. Moreover, as-prepared asymmetric supercapacitor device was able to lighten up the RED Led (1.8V), suggesting the high capacitance and extension of operating voltage window. The result of this research may help to pave the new possibility toward preparing the effective energy storage device material recycling the biomass.