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프러시안 블루 고정화에 따른 <sup>133</sup>Cs의 흡착거동 모델링
최상선,이우정,윤경재,조연지,이준혁,이순홍,Choi, S.S.,Lee, Y.J.,Yun, K.J.,Cho, Y.J.,Lee, J.H.,Lee, S.H. 한국안전학회 2021 한국안전학회지 Vol.36 No.1
Radionuclides, particularly radioactive cesium (Cs), are a concern of human health in some nuclear power accidents. It could lead to a high level of intracellular accumulation due to its high radioactivity and long half-life. Therefore, it is imperative to develop a method to remove Cs from wastewater. Herein, we synthesized activated carbon fibers (ACFs) doped with Prussian blue (PB) via in situ methods. We classified samples by their preparation method as either physical (PB-ACF-A) or physicochemical (PB-ACF-B) syntheses for comparison. The PB-ACF-B sample showed a significant surface loss compared to PB-ACF-A but a better <sup>133</sup>Cs adsorption capacity. All samples fit well to Langmuir isotherms and the values of qmax were directly correlated to the amount of PB on the surface of the ACFs. Adsorption characteristics were further confirmed by the calculated free energy, enthalpy, and entropy.
활성탄소섬유 제조시 전처리된 레이온 섬유의 열특성 분석
최상선 ( Sang Seun Choi ),이순홍 ( Soon Hong Lee ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.4
The aim of this study is to define the condition of optimal pre-treatment for preferable activated carbon fibers (ACFs), whichare based on rayon fibers. This paper shows the ideal path of ACFs preparation process; implies that rayon fibers are pre-treated byvarious solvents with different times before the heating process. The pre-treated rayon fibers finally turned into desirable rayonfiber-based ACFs through optimal pre-treatment condition by heating processes. The thermal analysis method of pre-treated rayon fibersby thermo-gravimetry analyser (TGA) is an idealized tool, which analyzes the best thermal condition of pre-treatment process. Surfacemorphologies of resulting rayon fibers based ACFs were examined by scanning electron microscope(SEM). The results of TGA andSEM analyses show that the optimal pre-treatment condition for preparing ACFs was clearly defined, in terms of thermal stability andsurface morphology.
Physical Nature of Biodegradable Polydioxanone Filaments upon Synthetic Conditions
Sang Sun Choi(최상선),Joon Hyuk Lee(이준혁),Soon Hong Lee(이순홍) 한국고분자학회 2020 폴리머 Vol.44 No.4
의학분야에서 polydioxanone(PDO)는 생체 안전성, 생분해도 및 기계적 강성의 이점으로 인해 기초적 및 실용적 연구 분야에서 큰 관심을 받고 있다. 선행연구 결과에서 PDO의 생화학적 구조는 증명되었으나, 단계별 제조조건 중 촉매와 세척 간 상관관계가 PDO의 물리적 특성에 미치는 영향에 대한 연구는 미미한 실정이다. 따라서 본 연구에서는 PDO의 촉매와 세척의 변화에 따른 물리적 강성 및 생분해도의 변화를 추적하였다. 샘플 중 가장 많은 ppm의 촉매(30 ppm)와 진공세척시간(3시간)을 도입한 PDO-3-30 샘플은 물리적 특성에서 가장 우수한 결과를 도출하였으나, 열역학 및 생분해도에서는 타 샘플대비 상대적으로 낮은 결과를 드러냈다. 모든 샘플의 특성을 비교하였을 때, 촉매의 양은 중합에서 가장 중요한 역할을 한다. 여기에서, 세척등급 또한 보다 세밀한 PDO 필라멘트의 물리적 특성을 제어할 수 있는 보조조건이 될 수 있다. In the medical field, polydioxanone (PDO) has increasingly attracted scientific interests in both fundamental research and applications for synthesizing sutures due to its safety, biodegradability, and mechanical strength. Chemical pathways of the aforementioned architecture have already been proven via a plethora of multidisciplinary researches, however, the physical nature of PDO filaments by each stage of the synthetic condition has yet been solely observed in detail. The scope of the present study tracks a couple of pre- and post-fiberation to tailor the success in tunable physical strength with the variance of purification time and the dosage of a catalyst. We first fabricated PDO filaments using lauryl alcohol (C12H26O) and stannous octoate (C16H30O₄Sn) as an initiator and a catalyst, respectively. PDO-3-30 with 3 h of vacuum purification and 30 ppm dosage of a catalyst led to unfavorable thermal properties and degradability but an increase in physical properties including tensile, flexural, and Izod impact strengths. From thermal and physical profiles, it was confirmed that the amount of a catalyst is a major driving factor of polymerization while the degree of purification could be an additive aid for more sensitive control of the physical nature of PDO filaments.