화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Clean Technology, Vol.24, No.1, 55-62, March, 2018
DOI10.7464/ksct.2018.24.1.055  Export Citation
양이온 교환 및 염 함침을 통한 메조다공성 실리카와 유기-금속 구조체의 수분 흡착 특성 조절
Control of Water-Adsorption Properties of Mesoporous Silica and MOF by Ion Exchange and Salt Impregnation
이은경1, 2, 조강희1, 김상겸1, 3, 임종성2, †, 김종남1, †
  • 1한국에너지기술연구원, 대전 유성구 가정로 152
  • 2서강대학교 화공생명공학과, 서울특별시 마포구 백범로 35
  • 3충남대학교 에너지과학기술대학원, 대전 유성구 대학로 99
Eun Kyung Lee1, 2, Kanghee Cho1, Sang Kyum Kim1, 3, Jong Sung Lim2, †, and Jong-Nam Kim1, †
  • 1Korea Institute of Energy Research, 152, Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea
  • 2Department of Chemical Biomolecular Engineering, Sogang University, 35, Baekbeom-ro, Mapo-gu, Seoul, 04107, Republic of Korea
  • 3Graduate School of Energy Science and Technology, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
E-mail:,
초록
90 ℃ 이하의 저온열원 구동 수분 흡착식 냉방 시스템에 사용되는 흡착제는 효과적인 냉열 생산을 위해서 상대습도(P/P0)0.1 ~ 0.3에서 높은 수분 흡-탈착량 차를 보이는 것이 좋다. 메조다공성 실리카(MCM-41)와 다공성 유기-금속 구조체(MIL-101) 의 경우 최대 수분 흡착량은 많지만 상대습도(P/P0) 0.1 ~ 0.3 구간에서 각각 0.027 gwater gads -1, 0.074 gwater gads-1의 낮은 수분 흡-탈착량 차를 갖는다. 이 연구에서는 메조다공성 실리카와 다공성 유기-금속 구조체의 표면 성질을 조절하여 상대습도(P/P0) 0.1 ~ 0.3에서 수분 흡-탈착량 차를 증가시켰다. 주로 수분 흡착이 상대습도(P/P0) 0.5 ~ 0.7에서 일어나는 메조 다공성 실리카의 경우 알루미늄을 관능화 시킨 후에 염기도가 다른 여러 양이온(Na+, NH4+, (C2H5)4N+)들로 교환하거나 염 (CaCl2)을 20 wt% 함침하여 각각의 흡착제들에 대해 35 ℃에서 수분 흡착 등온선을 측정하였다. 양이온 교환 후 수분 흡착이 주로 일어나는 구간이 상대습도(P/P0) 0.5 부근으로 이동하였으나 여전히 상대습도(P/P0) 0.1 ~ 0.3에서 낮은 수분 흡-탈착량 차를 보였다. 하지만 흡습성을 갖는 염(CaCl2)을 20 wt% 함침한 메조다공성 실리카는 상대습도(P/P0) 0.1 ~ 0.3에서 수분 흡-탈착량 차가 0.027 gwater gads-1에서 0.152 gwater gads-1으로 증가하였다. 수분 흡착이 상대습도(P/P0) 0.3 ~ 0.5에서 주로 일어나는 다공성 유기-금속 구조체에도 염(CaCl2)을 20 wt% 함침하였더니 상대습도(P/P0) 0.1 ~ 0.3에서 수분흡-탈착량 차가 0.330 gwater gads -1까지 증가하였다.
The adsorbent used in water-adsorption cooling system utilizing low-temperature heat of below 90 ℃ is required to exhibit high water uptake capacity at a relative humidity (P/P0) between 0.1 and 0.3. Mesoporous silica (MCM-41) and MOF (MIL-101) exhibit quite large water adsorption capacity under saturated water vapor at 35 ℃. However, these adsorbents show small water adsorption capacity (0.027 gwater gads -1, 0.074 gwater gads -1, respectively) in the relative humidity (P/P0) range of 0.1 to 0.3. In this study, the surface properties of mesoporous silica and MOF were modified by simple methods to develop an adsorbent having a higher water uptake than the conventional water adsorbents at a relative humidity (P/P0) of 0.1 ~ 0.3. In the case of mesoporous silica (MCM-41) exhibiting mainly water adsorption at P/P0 = 0.5 ~ 0.7, aluminum species was functionalized on the mesopore walls and then cations existing near the aluminum were exchanged with various cations (e.g., Na+, NH4 +, and (C2H5)4N+). In addition, 20 wt% (to total weight of the composites) of hygroscopic inorganic salt (CaCl2) was impregnated on the MCM-41. In the case of the MIL-101 (MOF), 20 wt% of hygroscopic inorganic salt (CaCl2) was impregnated on the MIL-101. The MCM-41 which was ion-exchanged with various cations has main adsorption branch around 0.5 of P/P0 which was slightly shifted with low-pressure direction in comparison with pristine MCM-41. However, tiny increases were observed on the adsorption in the range of P/P0 between 0.1 and 0.3. After salt impregnation on the MCM-41, the adsorption capacity under P/P0 = 0.1 ~ 0.3 at 35 ℃ was increased from 0.027 gwater gads -1 to 0.152 gwater gads -1. In the case of MIL-101, the amount of water adsorption at 35 ℃ under P/P0 = 0.1 ~ 0.3 was increased from 0.074 gwater gads -1 to 0.330 gwater gads -1 after the salt impregnation.
Keywords:MCM-41;MIL-101;Ion exchange;Salt impregnation;Water adsorption
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