Cobweb-inspired DNA-based membranes for multicomponent pollutant-oil-water emulsions separation
- Authors
- Lin, Xiangde; Heo, Jiwoong; Hong, Jinkee
- Issue Date
- Sep-2018
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Cobweb-inspired membrane; DNA-based membrane; Superoleophobicity; Multicomponent separation; Oil-water separation
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.348, pp 870 - 876
- Pages
- 7
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 348
- Start Page
- 870
- End Page
- 876
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/45196
- DOI
- 10.1016/j.cej.2018.05.063
- ISSN
- 1385-8947
1873-3212
- Abstract
- Superwetting membranes are increasingly being applied in oil-water separation processes, especially for conventional immiscible mixtures, micro-emulsions, and nano-emulsions. However, in practical water purification processes, these mixtures usually contain other contaminated components, such as inorganic salts, nanoparticles, organic compounds, proteins, and bacteria. Herein, we report for the first time a superwetting membrane prepared from deoxyribonucleic acid (DNA)-based nanofibril materials for creating a multicomponent pollutant-oil-water filtration system. The development of such a system is challenging, considering that matter dispersed in the water phase must be separated by extra filtration process in conventional oil-water separations. The DNA-based membranes can be prepared with thicknesses as small as several tens of nanometers and transferred to a stainless steel mesh to form cobweb-inspired fibrous membranes. The resulting membranes can successfully filter nanoscale model molecules due to their cross-linked DNA fibril-based pores, and can separate oil-water emulsions because of their underwater superoleophobic/low-oil-adhesion properties. Thus, multicomponent pollutant-oil-water emulsions can be purified at a relatively low operation pressure, allowing the separation of water and other components with only one ultra-filtration membrane. The findings in the present work provide a completely novel route for addressing real-world oily wastewater or other mixtures with complicated compositions.
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