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Porous multifunctional fluoropolymer composite foams prepared via humic acid modified Fe3O4 Nanoparticles stabilized Pickering high internal phase emulsion using cationic fluorosurfactant as co-stabilizer
Arabian Journal of Chemistry ( IF 6 ) Pub Date : 2018-04-14
Umair Azhar, Chenxi Huyan, Xiaozheng Wan, Chuanyong Zong, Anhou Xu, Jitao Liu, Jiachen Ma, Shuxiang Zhang, Bing Geng

Fluoropolymers are very important owing to their excellent application performances, especially in extreme conditions. On the other hand, the preparation of porous fluoropolymers is a difficult task due to unavailability of suitable surfactants as well as tedious synthesis steps. Here we prepared multifunctional porous fluoropolymer composite foams with a simple process of “high internal phase emulsion (HIPE)” by using humic acid modified iron oxide nanoparticles (HA-Fe3O4 NPs) and cationic fluorosurfactant (CFS) (PDMAEMA-b-PHFBA) as co-stabilizer. The inclusion of HA-Fe3O4 NPs in the system made fluoro-HIPE more stable than the emulsion prepared using only CFS or other conventional stabilizers. Morphology of the prepared polyHIPE was easily controlled by altering the concentration of HA-Fe3O4 and/or CFS in the original formulation. Adjustment of the porous structure with open/close cells was performed and the average diameter of the pores tuned between 4.9-23 μm. With the increase in specific surface area by using nanoparticles (NPs) and CFS as co-surfactants, Pickering HIPE monoliths adsorbed double amount of oil compared to foams based solely on HIPE template. Multiple functional groups were bound onto Fe3O4 NPs through HA modification that made the fluoro-monolith capable of adsorbing dye, i.e. methylene blue, from water. A simple centrifugation enabled regeneration of the oil soaked foams and adsorption capacity was not decreased after 10 adsorption/regeneration cycles.



中文翻译:

腐殖酸改性的Fe 3 O 4纳米粒子稳定化的Pickering高内相乳液的多孔多功能含氟聚合物复合泡沫,使用阳离子含氟表面活性剂作为共稳定剂

含氟聚合物由于其出色的应用性能而非常重要,特别是在极端条件下。另一方面,由于没有合适的表面活性剂以及繁琐的合成步骤,多孔氟聚合物的制备是一项艰巨的任务。在这里,我们通过使用腐殖酸改性的氧化铁纳米颗粒(HA-Fe 3 O 4 NPs)和阳离子含氟表面活性剂(CFS)(PDMAEMA- b-),以简单的“高内相乳液(HIPE)”工艺制备了多功能多孔含氟聚合物复合泡沫。 PHFBA)作为助稳定剂。包含HA-Fe 3 O 4与仅使用CFS或其他常规稳定剂制备的乳液相比,系统中的NP使氟HIPE更加稳定。通过改变原始配方中HA-Fe 3 O 4和/或CFS的浓度,可以轻松控制所制备的polyHIPE的形态。进行具有开/关孔的多孔结构的调节,并且将孔的平均直径调节在4.9-23μm之间。通过使用纳米颗粒(NPs)和CFS作为辅助表面活性剂来增加比表面积,与仅基于HIPE模板的泡沫相比,Pickering HIPE整料吸附了两倍的油。Fe 3 O 4上结合了多个官能团通过HA修饰的NP使氟整体能够从水中吸附染料,即亚甲基蓝。通过简单的离心分离,可以使浸泡过油的泡沫再生,并且在10次吸附/再生循环后吸附能力不会降低。

更新日期:2018-04-25
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