Table Salt as a Template to Prepare Reusable Porous PVDF-MWCNT Foam for Separation of Immiscible Oils/Organic Solvents and Corrosive Aqueous Solutions
Table Salt as a Template to Prepare Reusable Porous PVDF-MWCNT Foam for Separation of Immiscible Oils/Organic Solvents and Corrosive Aqueous Solutions
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DOI：
10.1002/adfm.201702926
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发表时间：
2017-11-03
影响因子：
19
通讯作者：
Parkin, Ivan P.
中科院分区：
文献类型：
--
作者：
Chen, Faze;Lu, Yao;Parkin, Ivan P.
许多先进材料被设计用于分离不混溶的油/有机溶剂和水溶液，包括具有超润湿性的聚（偏二氟乙烯）（PVDF）基材料。然而，由于PVDF的溶解度有限，技术（例如，相转化和静电纺丝）通常涉及有毒有机溶剂的使用。本文介绍了一种以食盐为牺牲模板，在无有机溶剂条件下制备多孔PVDF-MWCNT泡沫材料的方法。由于PVDF-MWCNT多孔泡沫的三维孔隙率和低表面能，其特征在于具有良好弹性的超疏水-超亲油性。该泡沫对各种油/有机溶剂表现出高吸附能力，并且可以通过挤压、加热或在其他溶剂中释放而容易地重复使用。此外，该泡沫对紫外线暴露、腐蚀性水溶液如酸性、碱性、盐性溶液和湍流环境具有高度耐受性，并且在这些复杂环境中显示出有效的油/有机溶剂去除。本文还介绍了在真空辅助下连续分离不互溶油/有机溶剂和腐蚀性水溶液的方法。PVDF-MWCNT泡沫材料不含有机溶剂，可重复使用，是一种有前途的候选人，用于大规模工业分离油/有机溶剂和水在腐蚀性和湍流条件下。
Many advanced materials are designed for separation of immiscible oils/organic solvents and aqueous solutions, including poly(vinylidene fluoride) (PVDF)-based materials with superwettability. However, due to the limited solubility of PVDF, techniques (e.g., phase inversion and electrospinning) often involve the use of toxic organic solvents. Here a facile organic solvent-free method is described to prepare a porous PVDF-MWCNT (multiwalled carbon nanotube) foam using table salt as a sacrificial template. The porous PVDF-MWCNT foam is characterized as superhydrophobic-superoleophilic with good elasticity due to its 3D porosity and low surface energy. The foam exhibits high adsorption capacity to a variety of oils/organic solvents and can be easily reused by squeezing, heating, or releasing in other solvents. Moreover, the foam is highly resistant toward UV exposure, corrosive aqueous solutions such as acidic, alkaline, salty solutions, and turbulent environments, and shows effective oils/organic solvents removal in these complex environments. The continuous separation of immiscible oils/organic solvents and corrosive aqueous solutions with vacuum assistance is also presented. The organic solvent-free and reusable PVDF-MWCNT foam is a promising candidate for large-scale industrial separation of oils/organic solvents and water in corrosive and turbulent conditions.