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메조 세공 제올라이트 Y가 코팅 된 알루미나 중공사막을 이용한 중금속 흡착
박서현 ( Seo-hyun Pak ),박정훈 ( Jung Hoon Park ),박찬규 ( Chan-gyu Park ) 한국수처리학회 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.
메조 세공 제올라이트 Y 합성 및 이를 이용한 중금속(Mn<sup>2+</sup>, Fe<sup>2+</sup>)의 흡착
박서현 ( Seo-hyun Pak ),박찬규 ( Chan-gyu Park ) 한국수처리학회 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 CH<sub>3</sub>(CH<sub>2</sub>)<sub>15</sub>N(Br)(CH<sub>3</sub>)<sub>3</sub> 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 Mn<sup>2+</sup> and Fe<sup>2+</sup> 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 Mn<sup>2+</sup> and Fe<sup>2+</sup>.
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.
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.
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.
휘발성 유기화합물 제거를 위한 저온 vacuum swing adsorption 공정의 실용화 연구
전미진 ( Mi-jin Jeon ),박서현 ( Seo-hyun Pak ),이형돈 ( Hyung-don Lee ),전용우 ( Yong-woo Jeon ) 한국공업화학회 2017 공업화학 Vol.28 No.3
본 연구에서는 주요한 휘발성 유기화합물의 발생원인 도장공장 중에서 중소규모의 공장에 적용 가능한 저온 vacuum swing adsorption (VSA) 기술에 대하여 연구하였다. 저온 VSA 기술이란 기존의 thermal swing adsorption (TSA)의 단점을 보완하기 위하여 저온(60~90 ℃)에서 감압하여 흡착질을 탈착하는 방식이다. 국내에서 시판되고 있는 상용 활성탄을 이용하여 대표적인 VOCs인 톨루엔의 흡·탈착 특성을 랩(Lab)규모로 실험하였으며, 이를 바탕으로 30 ㎥min<sup>-1</sup> 규모의 VSA 시스템을 설계하여 실제 도장 공장에 적용하여 VSA 시스템의 현장적용 가능성에 대하여 평가하였다. 랩 규모 실험 결과, 2 mm 펠렛형 활성탄은 4 mm 펠렛형 활성탄보다 높은 톨루엔 흡착능을 나타내었으며, 이에 파일럿 규모의 VSA의 충진 활성탄으로 사용되었다. 탈착 실험에서는 80~90 ℃의 온도와 100 torr의 압력이 최적 조건으로 결정되었다. 랩 규모 실험 결과를 바탕으로 파일럿 규모 VSA 시스템을 설계하였으며 실제 도장 공장에 현장 적용하여 95회 흡·탈착 실험을 반복 수행하였다. 수행 결과, 연속 흡·탈착 반복실험 후, 도정공장에서 배출된 VOCs를 98% 이상 효과적으로 제거 가능함을 확인하였으며 VSA 시스템의 안정적인 현장 적용이 가능함을 검증하였다. The objective of this work was to study the low temperature vacuum adsorption technology applicable to small and medium scale painting plants, which is the main emission source of volatile organic compounds. The low-temperature vacuum swing adsorption (VSA) technology is the way that the adsorbates are removed by reducing pressure at low temperature (60~90 ℃) to compensate disadvantages of the existing thermal swing adsorption (TSA) technology. Commercial activated carbon was used and the absorption and desorption characteristics of toluene, a representative VOCs, were tested on a lab scale. Also based on the lab scale experimental results, a 30 ㎥min<sup>-1</sup> VSA system was designed and applied to the actual painting factory to assess the applicability of the VSA system in the field. As a result of lab scale experiments, a 2 mm pellet type activated carbon showed higher toluene adsorption capacity than that of using 4 mm pellet type, and was used in a practical scale VSA system. Optimum conditions for desorption experiments were 80~90 ℃ and 100 torr. In the practical scale system, the adsorption/desorption cycles were repeated 95 times. As a result, VOCs discharged from the painting factory can be effectively removed upto 98% or more even after repeated adsorption/desorption cycles when using VSA technology indicating potential field applicabilities.