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09월 03일 23시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Syntheses and applications of hydrophobic cobalt–azolate frameworks for water purification
2018년 8월 20일 14시 09분 06초
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10월 18일 (목요일) 11:00~12:30
Bhadra Biswa Nath
, Sung Hwa Jhung
Department of Chemistry, Kyungpook National University, Korea
Two cobalt–azolate frameworks (MAF-5(Co) and MAF-6(Co)) with high porosity were synthesized in pure-phase at room temperature. The MAF-5(Co) and MAF-6(Co) are isostructural with MAF-5(Zn) and MAF-6(Zn) that was reported previously. For mixing the precursors for the MAFs were done in two different ways, e. g. slow and fast mixing method. Fast mixing method was observed as the most efficient method for synthesizing MAF(Co) materials in pure-phase with high yield. To characterize the obtained materials XRD patterns, N2-isotherms, SEM-images, water and n-octane adsorption analyses were conducted. The synthesized MAFs(Co) high porosity and hydrophobicity, similar to the analogous MAFs those composed of Zn. To find the applicability of newly developed materials, MAF-5(Co) and MAF-6(Co), they were applied in the adsorption of n-octane as a model oil from water and the obtained results were compared to those of related materials, i.e., MAF-4(Co and Zn), MAF-5(Zn), and MAF-6(Zn), as well as with Cu-BTC (Cu-benzenetricarboxylate) together with a conventional adsorbent, activated carbon. Surprisingly, MAF-5(Co), even with low porosity, showed remarkable competitiveness among the typical porous materials for n-octane removal. However, better performance of MAF-6(Co) was observed for the adsorption of n-dodecane. The obtained results suggested that the framework structure including cavity and aperture sizes rather than surface area play a critical role in the hydrocarbon (n-octane or n-dodecane) removal from water. Moreover, simple evaporation of the adsorbed n-octane was enough to regenerate the adsorbent MAF-5(Co) for next uses and thereby suggested as a potential adsorbent for the removal of spilled oil from water. Therefore, the synthesized MAFs can be suggested as impressive adsorbents in water purification probably on account of their hydrophobicity.
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