메타크릴산이 그래프팅된 천연제올라이트의 중금속제거에 관한 연구

박서현 ( Seo-hyun Pak ),김환 ( Hwan Kim ),박찬규 ( Chan-gyu Park ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-

Polymerized mesoporous nature zeolites (pMNZ) was simply prepared by acid treatment and polymerization of metaclic acid, which evaluated as adsorbents for the removal of cationic/anionic heavy metals from aqueous solutions. The effects of treatment time and different acids during synthesis on the pore structure of the MNZ were studied, and the pMNZ samples were characterized by nitrogen full isotherms, XRF analysis, and FT-IR spectroscopy. The MNZ prepared using hydrochloric acid had higher meso pore volume, and surface area. The BET analysis showed that the surface area of MNZ is 82 m2/g greater than that of natural zeolite that is 39 m2/g. We investigated the adsorption ability of pMNZ for metal ions (Cu (II), Mn (II), and As (V)) and evaluated the influence of pH. The removal efficiencies of pMNZ for Cu(II), Mn(II), As(V) were 44%, 51%, 99% and qe were 0.88, 0.75, 0.04, respectively. In addition, the adsorption kinetics were evaluated using pseudo-first-order and pseudo-second-order models. The internal and external diffusion models were studied to explain the adsorption process in pMNZ. The adsorption capacity resulted that the pMNZ could eliminate the anionic, cationic metal ions from aqueous solution at pH range of 6-10 and different kinetics were examined to explain the adsorption process.

Antioxidant and Anti-Inflammatory Activity of Oryza sativa L. Extract Fermented with Lactobacillus plantarum

Seo Hyun Park(박서현),Jae Gon Kim(김재곤),In Ho Choi(최인호),Beong Ou Lim(임병우) 한국약용작물학회 2019 한국약용작물학회 학술대회논문집 Vol.2019 No.1

Polydopamine (PDA)-TiO₂ 코팅 유리섬유 직물을 이용한 VOCs의 저감 성능 및 항균성 연구

박서현(Seo-Hyun Park),최예인(Yein Choi),이홍주(Hong Joo Lee),박찬규(Chan-gyu Park) 한국환경보건학회 2021 한국환경보건학회지 Vol.47 No.6

Background: Indoor air pollutants are caused by a number of factors, such as coming in from the outside or being generated by internal activities. Typical indoor air pollutants include nitrogen dioxide and carbon monoxide from household items such as heating appliances and volatile organic compounds from building materials. In addition there is carbon dioxide from human breathing and bacteria from speaking, coughing, and sneezing. Objectives: According to recent research results, most indoor air pollution is known to be greatly affected by internal factors such as burning (biomass for cooking) and various pollutants. These pollutants can have a fatal effect on the human body due to a lack of ventilation facilities. Methods: We fabricated a polydopamine (PDA) layer with Ti substrates as a coating on supported glass fiber fabric to enhance its photo-activity. The PDA layer with TiO2 was covalently attached to glass fiber fabric using the drop-casting method. The roughness and functional groups of the surface of the Ti substrate/PDA coated glass fiber fabric were verified through infrared imaging microscopy and field emission scanning electron microscopy (FE-SEM). The obtained hybrid Ti substrate/PDA coated glass fiber fabric was investigated for photocatalytic activity by the removal of ammonia and an epidermal Staphylococcus aureus reduction test with lamp (250 nm, 405 nm wavelength) at 24°C. Results: Antibacterial properties were found to reduce epidermal staphylococcus aureus in the Ti substrate/ PDA coated glass fiber fabric under 405 nm after three hours. In addition, the Ti substrate/PDA coated glass fiber fabric of VOC reduction rate for ammonia was 50% under 405 nm after 30 min. Conclusions: An electron-hole pair due to photoexcitation is generated in the PDA layer and transferred to the conduction band of TiO₂. This generates a superoxide radical that degrades ammonia and removes epidermal Staphylococcus aureus.

라깡의 성차공식과 예술의 해석

박서현(Seo-Hyun Park) 현대미술학회 2015 현대미술학 논문집 Vol.19 No.2

본 논문은 라깡의 성차공식을 자세히 분석하여 라깡의 성이론에서 남성적 주체와 여성적 주체는 어떻게 구성되며 이 둘은 어떻게 관계를 맺고 있는지 살펴본다. 팔루스 질서에 사로잡힌 남자와 상징계 질서를 넘어서는 여자가 서로 사랑하는 것이 어떻게 가능한가? ‘나는 너를 안다’라는 지식의 폭력으로 상대를 포섭하지 않고 관계를 맺어야하는 과제를 어떻게 수행할 수 있는가? 나아가 남성적 주체와 여성적 주체가 관계를 통해 예술작품의 해석에 있어 새로운 태도와 윤리를 제공받을 수 있다고 기대한다. 예술작품에서 어떤 지식을 이끌어내려 시도한다는 점에서 우리 모두는 남성적 주체의 입장을 경험하게 된다. 상징계 너머에서 우리에게 수수께끼를 던지고 있는 예술을 여성적 주체라 가정한다면, 우리는 작품과 어떤 관계를 맺을 수 있을지 새롭게 이해할 수 있을 것이다. This paper is to examine the Lacan’s sexuation theory. It aims to show a thread of connection between the women’s jouissance that feminine subject enjoys in the Lacan’s theory and the interpretation of art. According to lacan, the subject must experience alienation and divisions. As a result of division, the subject cannot fully know about her own desire. A woman is a lack of language and knowledge. There is no place of being women in the social codes. She exists as a mystery like art. A woman means love or art. Through the examinaion of sexuation, this paper try to find the way of Interpretation of art.

하이데거에 있어서 ‘죽음’의 의의

박서현(Seo-Hyun Park) 한국철학회 2011 철학 Vol.0 No.109

이 글의 과제는 『존재와 시간』의 기초존재론의 구도 안에서 하이데거가 말하는 죽음의 가능성의 의의를 확인하는 것이다. 존재자로서의 현존재와 현존재의 존재의 구분, 현존재의 자기수행적 관계성, 현존재의 자기이해에서의 가능성의 문제, 죽음의 가능성과 본래성/비본래성의 문제, 죽음으로의 선구와 시간성 사이의 연관을 검토함으로써 이 글은 죽음의 가능성이 현존재의 자유와 자기 정초를 가능하게 한다는 점을 확인한다. This paper tries to show the meaning of the possibility of death in Heidegger"s fundamental ontology of Being and Time. For that purpose, this paper investigates the distinction between the human being (Dasein) and the Being (Sein) of the human being, the performative self-relationship of the human being, the possibility of the human being and his relationship to authenticity/inauthenticity, and finally, the anticipation of death (Vorlaufen zum Tode) and its relationship to the temporality of the human being. By this, this paper demonstrates that the possibility of death in Heidegger"s fundamental ontology makes a human being"s freedom and her self-grounding (Selbst-Begru?ndung).

하이데거에게서 시간성과 전회의 문제에 대한 고찰

박서현(Seo Hyun Park) 철학연구회 2009 哲學硏究 Vol.0 No.87

This paper shows how the problem of temporality (Zeitlichkeit) made the turning-around (Kehre) of Heidegger. The lecture On the Essence of Truth in 1930 is the point of Heidegger`s turning-around, which made Heidegger`s earlier thought into the historical thought of Being (das seinsgechichtliche Seinsdenken). The reason why Heidegger reached this turning-around is the metaphysic of subject which is far from the historical concealment of the Being itself. The problem of this metaphysic of subject found in early Heidegger thought is the problem of the understanding of Being of human beings (Dasein) based on the temporality of human beings, i.e., the subjectivity of subject. One of the tasks of early Heidegger is to ground the understanding of Being in the openness of the human being. This task is possible by the investigation of temporality, because early Heidegger thought that the temporality makes the horizon of the understanding of Being. But the most important thing is that temporality can not ground the historical a priori of the understanding of Being. This is the reason why Heidegger reached the turning-around of his thought.

메타크릴산이 그래프팅된 천연제올라이트의 중금속제거에 관한 연구

박서현 ( Seo-hyun Pak ),김환 ( Hwan Kim ),박찬규 ( Chan-gyu Park ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-

Polymerized mesoporous nature zeolites (pMNZ) was simply prepared by acid treatment and polymerization of metaclic acid, which evaluated as adsorbents for the removal of cationic/anionic heavy metals from aqueous solutions. The effects of treatment time and different acids during synthesis on the pore structure of the MNZ were studied, and the pMNZ samples were characterized by nitrogen full isotherms, XRF analysis, and FT-IR spectroscopy. The MNZ prepared using hydrochloric acid had higher meso pore volume, and surface area. The BET analysis showed that the surface area of MNZ is 82 m2/g greater than that of natural zeolite that is 39 m2/g. We investigated the adsorption ability of pMNZ for metal ions (Cu (II), Mn (II), and As (V)) and evaluated the influence of pH. The removal efficiencies of pMNZ for Cu(II), Mn(II), As(V) were 44%, 51%, 99% and qe were 0.88, 0.75, 0.04, respectively. In addition, the adsorption kinetics were evaluated using pseudo-first-order and pseudo-second-order models. The internal and external diffusion models were studied to explain the adsorption process in pMNZ. The adsorption capacity resulted that the pMNZ could eliminate the anionic, cationic metal ions from aqueous solution at pH range of 6-10 and different kinetics were examined to explain the adsorption process.

메조 세공 제올라이트 Y 합성 및 이를 이용한 중금속(Mn²⁺, Fe²⁺)의 흡착

박서현 ( Seo-hyun Pak ),박찬규 ( Chan-gyu Park ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.6

We studied a simple approach for synthesis of mesoporous Y(M-Y) from commercial zeolite Y precursors by treating of NaOH with CH₃(CH₂)₁₅N(Br)(CH₃)₃ as template. The physicochemical properties of the mesoporous zeolites Y were then analyzed using XRD, nitrogen full-isotherms at 77 K, SEM and TEM. The nitrogen adsorption-desorption analysis showed that surface area and pore diameter of synthesized mesoporous zeolite Y(M-Y) were 1072 ㎡/g and ~3.3 nm, respectively. And M-Y was applied for the removal of Mn²⁺ and Fe²⁺ from aqueous solution. This material, which introduces mesoporosity with zeolite Y character, displayed a superior adsorption capacity than commercial zeolite Y when used as an adsorbent for the removal of Mn²⁺ and Fe²⁺.

메타크릴산이 그래프팅된 천연제올라이트의 중금속제거에 관한 연구

박서현 ( Seo-hyun Pak ),김환 ( Hwan Kim ),박찬규 ( Chan-gyu Park ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-

Polymerized mesoporous nature zeolites (pMNZ) was simply prepared by acid treatment and polymerization of metaclic acid, which evaluated as adsorbents for the removal of cationic/anionic heavy metals from aqueous solutions. The effects of treatment time and different acids during synthesis on the pore structure of the MNZ were studied, and the pMNZ samples were characterized by nitrogen full isotherms, XRF analysis, and FT-IR spectroscopy. The MNZ prepared using hydrochloric acid had higher meso pore volume, and surface area. The BET analysis showed that the surface area of MNZ is 82 m2/g greater than that of natural zeolite that is 39 m2/g. We investigated the adsorption ability of pMNZ for metal ions (Cu (II), Mn (II), and As (V)) and evaluated the influence of pH. The removal efficiencies of pMNZ for Cu(II), Mn(II), As(V) were 44%, 51%, 99% and qe were 0.88, 0.75, 0.04, respectively. In addition, the adsorption kinetics were evaluated using pseudo-first-order and pseudo-second-order models. The internal and external diffusion models were studied to explain the adsorption process in pMNZ. The adsorption capacity resulted that the pMNZ could eliminate the anionic, cationic metal ions from aqueous solution at pH range of 6-10 and different kinetics were examined to explain the adsorption process.

메조 세공 제올라이트 Y가 코팅 된 알루미나 중공사막을 이용한 중금속 흡착

박서현 ( Seo-hyun Pak ),박정훈 ( Jung Hoon Park ),박찬규 ( Chan-gyu Park ) 한국수처리학회(구 한국수처리기술연구회) 2021 한국수처리학회지 Vol.29 No.2

In this study, mesoporous-zeolite-Y-coated alumina hollow fiber membranes were prepared by optimizing the synthesis conditions and using commercial zeolite Y, CTAB, as the structure-directing agent and alumina hollow fiber membranes. The removal of heavy metals was investigated using these membranes. The synthesized membranes were characterized with X-ray diffraction, field emission scanning electron microscopy, nitrogen adsorption-desorption analysis, field emission transmission electron microscopy, Fourier transform infrared spectroscopy, and the heavy metal adsorption activity of these membranes was investigated with ultraviolet-visible spectroscopy. Batch tests were conducted to investigate the capabilities of the mesoporous-zeolite-Y-coated membranes in removing Mn (II) and Fe (II)fromaqueoussolutions.Nitrogen full isotherm analyses confirmed that the synthesized mesoporous adsorbents were homogenously mesoporous. These results suggest that the mesoporous-zeolite-Y-coated membranes exhibited higher adsorption capacity than that of the alumina hollow fiber membranes. After three runs of heavy metal adsorption, there was no drop in the activity of the prepared mesoporous-zeolite-Y-coated alumina hollow fiber membranes because they were easier to separate and more durable than the conventional powdered adsorbents.