광미로부터 합성된 메조포러스 실리카의 흡·방습 특성 평가
Evaluation on ab/desorption of Water Vapor for Mesoporous Silica Synthesized using the Mineral Tailing
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초록
자율 조습재를 개발하고자 광미를 활용하여 메조포러스 실리카를 제조하여 흡 · 방습 특성을 평가하였다. 합성에 있어서 실리카원 광미의 비교물질로는 TEOS를 이용하였다. 광미로부터 합성된 메조포러스 실리카 M-MCM-41과 M-SBA-15의 비표면적, 총 기공부피 그리고 평균 기공크기는 각각 507 m2/g, 0.45 cm3/g, 3.3 nm 그리고 330 m2/g, 0.54 cm3/g, 6.0 nm로 측정되었다. 흡·방습 평가 결과, MCM-41과 M-MCM-41의 흡·방습량은 각각 143.7 g/m2, 27.6 g/m2와 159.4 g/m2, 46.5 g/m2이고, SBA-15, M-SBA-15의 흡·방습량은 각각 190.7 g/m2, 117.3 g/m2와 242.7 g/m2, 131.6 g/m2로, 합성된 물질 중 광미로부터 제조한 메조포러스 실리카 M-SBA-15가 가장 흡·방습 특성이 높음을 확인하였다. 또한 M-SBA-15가 수증기의 흡·방습 이후에도 기공 구조가 거의 변하지 않는 것으로 분석되었다.
Abstract
The ab/desorption characteristics of the mesoporous silica, which was synthesized using the mineral tailing was investigated to develop the material for self-controlling humidity. In synthesis, tetraethyl orthosilicate (TEOS) was used for comparing the mineral tailing of silica source. Specific surface area, pore volume and median pore diameter of M-MCM-41 were measured as 507 m2/g, 0.45 cm3/g and 3.3 nm, whereas those of M-SBA-15 were 330 m2/g, 0.54 cm3/g and 6.0 nm, respectively. The results of ab/desorption tests showed that the absorption amounts of water vapor in MCM-41, M-MCM-41, SBA-15 and M-SBA-15 were measured as 143.7 g/m2, 159.4 g/m2, 190.7 g/m2 and 242.7 g/m2, whereas the desorption amounts from MCM-41, M-MCM-41, SBA-15 and M-SBA-15 were 27.6 g/m2, 46.5 g/m2, 117.3 g/m2 and 131.6 g/m2, respectively. The most amount of ab/desorption of water vapor was found with M-SBA-15, which was synthesized with mineral tailing, and the pore structure of M-SBA-15 was not significantly changed even after the ab/desorption of water vapor.
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