지르코늄 기반 금속유기골격체를 이용한 diisopropyl methylphosphonate 흡착 특성 연구
A study on the adsorption properties of diisopropyl methylphosphonate on zirconium based metal organic frameworks
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초록
화학작용제 공격 및 사고에 의한 위해 가스 누출은 상존하는 위협으로서 국민과 군인에 대한 적절한 보호대책 강구가 필요하다. 방독면 정화통에는 예로부터 활성탄이 사용되어 왔으나, 흡착능력, 가스 선택성 등을 증가시키기 위한 새로운 물질 개발이 요구되고 있다. 본 연구에서는 실험실에서 제조한 zirconium based metal organic frameworks(MOFs)을 사용하여 유사화학작용제 DIMP에 대한 흡착 능력을 측정하고, 상용 방독면 정화통에 사용된 활성탄과 비교하였다. 제조한 MOFs는 XRD 분석결과 기존 문헌결과와 유사한 결정구조를 보였으며, 상용 활성탄과 비교하여 높은 비표면적과 미세공극의 분포를 보였다. DIMP 흡착 속도는 MOFs가 상용 활성탄 보다 빨랐으며, 흡착 능력도 큰 것으로 나타났다. MOFs에 흡착된 DIMP는 XPS, EDS, FTIR 그리고 원소분석을 통해 확인할 수 있었다. MOFs 중 Uio-66은 Uio-67A 및 Uio-67H와 비교 시 상대적으로 비표면적은 작았으나 DIMP에 대한 높은 흡착능력을 보였다. DIMP 흡착 후 측정한 XRD 및 비표면적 분석 결과 P-Uio-66과 달리 P-Uio-67A 및 P-Uio-67H 시료는 DIMP 흡착 후 결정구조 피크 가 붕괴된 것을 보였고, 비표면적도 측정결과도 급격히 감소함을 발견하였다. 따라서 Uio-67을 DIMP 흡착을 위한 흡착제로 고려할 경우 신중한 접근이 요구된다.
Abstract
As an existential threat, hazard gas leakage caused by chemical warfare agent attack and accidents needs proper protection measures for people and soldiers. Activated carbon has long been used in gas mask as a filling material of filter cartridge canister. However the development for new material is required to increase adsorption capacity and chemical warfare agent selectivity. This study used lab-made zirconium based metal organic frameworks (MOFs) to measure the adsorption capacity of a chemical warfare agent simulant diisopropyl methylphosphonate (DIMP). The adsorption characteristics were compared with the activated carbon used in commercial gas masks. XRD analysis showed manufactured MOFs have similar crystal structure with existing literary results and display high specific surface area and micropore distribution compared to commercial activated carbon. MOFs had higher adsorption capacity than commercial activated carbon. DIMP adsorbed on MOFs was identified through XPS, EDS, FTIR and element analysis. UiO-66 of MOFs showed relatively small specific surface area compared to UiO-67A and UiO-67H, but showed high adsorption capacity for DIMP. XRD and specific surface area analysis showed that unlike P-UiO-66, the sample of P-UiO-67A and P-UiO-67H showed collapsed crystal structures after DIMP adsorption and sharp decrease in the results of specific surface area measurements. Therefore cautious approach is required when considering UiO-67 as a sorbent for DIMP adsorption.
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