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심호형,김희택,송시내,박성수,노영아,김진이,( Tran Xuan Tin ) 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Contamination of groundwater by heavy metal ions has been an issue in environmental. Many factories have to deal with purification facilities before draining the polluted solution off. However there are leakage risks of a little heavy metal though fine purification is treated. Therefore detecting method for heavy metal in groundwater is needed even if its concentration is very small. We used GNP-SiO<sub>2</sub> to detect Cd<sup>2+</sup> since GNP has colorimetric property which changes its color by aggregating each other and high porous silica has an advantage to absorb metal ion. GNP-SiO<sub>2</sub> are prepared by reaction of GNP and silica modified by thiol group. Cd<sup>2+</sup> detecting test was conducted with GNP-SiO<sub>2</sub> on different concentration condition of Cd<sup>2+</sup>. Then degree of contamination was observed as color change of GNP-SiO<sub>2</sub>. Moreover we studied sensitivity contrast in detecting by using silica having diverse surface area. The samples were confirmed by FTIR, UV-Spectra, BET, SEM and TEM.
김태현,심호형 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The current and projected shortage of fossil fuel availability has led to the ever-increasing interest in the conversion of renewable lignocellulosic resources to liquid fuels. In particular, cellulosic ethanol is the most widely used liquid biofuel alternative to petroleum transportation fuels. An effective approach for ethanol production is to break down the cellulose and hemicellulose chains, which comprise 60~70% of biomass, into their component sugars and then ferment monomeric sugars into ethanol. In other words, the biological conversion of fuel ethanol from lignocellulosic biomass can be achieved by pretreatment, enzymatic hydrolysis and fermentation. Among this conversion unit processes, the pretreatment is the key step for effective conversion and the research effort in pretreatment has been extensive. This presentation will give an overview of pretreatment process options for effective bioconversion. Technical challenges in ethanol production will also be reviewed.
2P-152 Optimization of nanofiber of Ag ion doped on TiO<sub>2</sub> sol (Ag@TiO<sub>2</sub> sol)
김진이,박성수,송시내,노영아,심호형,김희택 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
One-dimensional (1D) nanostructure of metal oxides and materials that have high surface area, strong adsorption properties, and the ability to produce more redox sites have been extensively studied. In addition, 1D structure materials are used in various fields such as electronics, photonics, sensing, and battery. The synthesis of nano-fibers are using by several synthesis methods such as electro-spinning, self-assembly, template and thermal-induced phase separation. In this study, we fabricated nano-fiber that Ag<sup>+</sup> particles were include in TiO<sub>2</sub> sol (Ag+@TiO<sub>2</sub> sol) using electro-spinning. The Ag<sup>+</sup>@TiO<sub>2</sub> sol was radiated in various voltage to synthesize the thin nano-fiber. As a result, the fiber formed at 15kv voltage was thin and uniform both of before and after calcination samples. The manufactured nano-fibers were characterized by XRD, SEM and TEM.
2P-157 Fabrication of Nano Porous Silica Aerogel-Polydimethylsiloxane (PDMS) Insulation Film
노영아,김희택,송시내,박성수,심호형,김진이,( Tran Xuan Tin ) 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
The silica aerogel is a suitable material to apply for insulation material with lower thermal conductivity than that of air to save energy. However expensive precursor and drying process were the main issues of the silica aerogel synthesis. Therefore, we demonstrate an ecofriendly route toward silica-PDMS insulation film with low thermal conductivity under ambient pressure. Silica aerogel was synthesized from rice husk ash, which was an agricultural waste to be able to recycle. The silica aerogel is prepared by sol-gel processing and obtained by modification of silica hydrogel surface and dry at ambient pressure. Finally, aerogel film was respectively fabricated by the different content with aerogel in PDMS. Silica aerogel particle size was analyzed by Scanning electron microscope and silica aerogel with high surface area (832.26 m²/g) was characterized by Brunauer Emmett Teller. Then thermal conductivity of silica Aerogel-PDMS insulation film was analyzed by thermal wave system.
송시내,김희택,박성수,심호형,( Tran Xuan Tin ),노영아,김진이 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
The biodegradable polymer has been used in the medical field with advantages of local healing and biocompatibility. Therefore we focus on a composite of silica available to apply various filed and biodegradable Polycaprolactone (PCL) to a medical polymer that can especially be applied to human bones. In this study, Polycaprolactone (PCL), a biodegradable polymer, is mixed with silica having a high specific surface area to confirm the influence of silica to PCL degradation. Rise husk silica- PCL composite fiber was fabricated by electrospinning, which we already set optimization condition of electrospinning from last experimental. Then the degree of composite degradation with time was verified generating a quantity of hydroxyapatite (HA) which material is related to apply human bone. Besides mechanical properties of PCL fiber upon silica surface area were confirmed. Results of each sample were obtained from EDX, SEM, DMA, TGA, and DSC analysis.
바이오매스 기반 친환경 연료첨가제 전환을 위한 수산화나트륨(NaOH) 활용 전처리 공정
김태현,박승현,여수아,심호형 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
수송용 석유계연료를 대체하기 위한 다양한 노력 중 하나는 바이오매스의 셀룰로오스 성분을 활용하여 탄화수소로 변환하여 사용하는 것이다. 셀룰로오스는 글루코오스의 중합체로서 분해되면 글루코오스 단량체가 얻어지고 탈수반응에 의해 5-HMF(hydroxymethylfurfural)로 변환이 되고 다시 levulinic acid로 전환이 가능하며 여기에서 다양한 탄화수소계 대체 연료를 만들 수 있다. 목질계 바이오매스는 셀룰로오스, 헤미셀룰로오스, 리그닌의 주요 성분으로 이루어져 있는데, 리그닌과 헤미셀룰로오스를 제거하기 위한 전처리 공정이 필수적 이다. 본 연구에서는 NaOH를 이용하여 소나무, 참나무 등의 바이오매스에서 리그닌을 제거하여 셀룰로오스 성분이 풍부한 원료를 만들어 내는 전처리 공정의 다양한 공정 변수의 영향을 실험하고 분석하였다. 화학적 성분 변화, 반응온도, 촉매농도, 반응시간 등의 영향에 대해 발표한다.