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Search / Korean Journal of Chemical Engineering
Korean Chemical Engineering Research,
Vol.51, No.4, 470-475, 2013
초음파 합성법을 이용한 UiO-66의 합성 및 이산화탄소 흡착/자일렌 이성체 분리 연구
Sonochemical Synthesis of UiO-66 for CO2 Adsorption and Xylene Isomer Separation
김희영, 김세나, 김준, 안화승
초음파-용매열 혼합방법으로 염화지르코늄과 1,4-benzenedicarboxylic acid를 사용하여 다공성 금속유기 구조체인 UiO-66을 1-L 규모로 제조하였다. 합성 개시 2시간 뒤 약 0.2 μm의 작고 고른 형태와 1,375 m2/g의 높은 비표면적을 갖는 결정을 95%의 높은 수율로 얻을 수 있었다. 제조된 UiO-66 물질의 이산화탄소 흡착 거동을 조사한 결과, 1기압 273 K 및 298K에서 각각 198 및 84 mg/g의 흡착량과 32:1 이상의 높은 질소 대비 이산화탄소 흡착 선택성을 갖는 것을 확인하였다. 흡착이 진행됨에 따라 흡착열은 33에서 25 kJ/mol 로 감소하였다. 또한 UiO-66 물질을 사용하여 액상 회분식 조건에서 자일렌 이성체의 분리 연구를 수행하였으며, o-자일렌이 단일성분 최대 흡착능 및 경쟁흡착에서도 m-, p-자일렌 대비 약 2배 이상의 높은 흡착 선호도를 갖는 것을 확인할 수 있었다.
Zr-benzendicarboxylate structure, UiO-66 was prepared in 1-L batch scale by using a unique sonochemical-solvothermal combined synthesis method. The produced UiO-66 showed uniform particles of ca. 0.2 μm in size with the BET surface area of 1,375 m2/g in high product yield (>95%). The UiO-66 showed 198 and 84 mg/g CO2 adsorption capacity at 273 K and 298 K, respectively, with excellent CO2 selectivity (CO2:N2=32:1) at ambient conditions. The isosteric heat of CO2 adsorption varied from 33 to 25 kJ/mol as the adsorption progressed. The UiO-66 tested for xylene isomer separation in a liquid-phase batch mode confirmed preferential adsorption of the adsorbent for o-xylene over m-, and p-xylene.
Keywords: Metal Organic Frameworks (MOFs); UiO-66; Sonochemical Synthesis; CO2 Adsorption; Xylene Isomer Separation
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