Preparation of omniphobic PVDF membrane with hierarchical structure for treating saline oily wastewater using direct contact membrane distillation
Preparation of omniphobic PVDF membrane with hierarchical structure for treating saline oily wastewater using direct contact membrane distillation
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多级结构全疏PVDF膜的制备用于直接接触膜蒸馏处理含盐含油废水
DOI：
10.1016/j.memsci.2018.03.041
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发表时间：
2018-06
影响因子：
9.5
通讯作者：
Tao He
中科院分区：
文献类型：
--
作者：
Rui Zheng;Ying Chen;Jin Wang;Jianfeng Song;Xue-Mei Li;Tao He
热驱动膜蒸馏技术是一种新型的海水淡化技术，几十年来一直受到科学界和工业界的广泛关注。然而，进料流中的污染物引起的膜污染是非常令人关注的。减轻膜污染需要从表面和材料科学的见解。我们报道了一种具有分级结构的全疏性聚偏氟乙烯（PVDF）膜，该膜是通过将纳米/微球喷涂到商业PVDF多孔基底上而形成的。基于二氧化硅纳米粒子（SiNPs）与聚苯乙烯（PS）微球之间的静电相互作用，制备了多尺度微球。一种化学粘合剂，聚合物3-甲基丙烯酰氧基丙基三甲氧基硅烷（PA 174）通过自由基聚合反应合成，被用来增强粒子的粘附到膜支持，导致一个强大的结构。最后一步使用1H，1H，2 H，2 H-全氟癸基三甲氧基硅烷（17-FAS）的膜的全憎性。本发明膜表面的水/十六烷接触角为176°/138.4°，水滑动角为7°。在膜蒸馏中用SDS表面活性剂稳定的十六烷乳液进料溶液浸渍，膜显示出非常稳定的通量和渗透侧的电导率降低，与其他基准膜的通量降低和渗透电导率增加相反。这种性能表明，具有分级形态的全憎膜在解决DCMD过程中的膜润湿和污染问题方面是有前途的。
Thermally driven membrane distillation process, for desalination of a wide spectrum of water, has attracted both scientific and industrial attention for decades. However, membrane fouling by contaminants in the feed stream was of great concern. Mitigating membrane fouling requires insights from surface and material science. We reported an omniphobic polyvinylidene fluoride (PVDF) membrane with hierarchical structure which was created by spray coating of the nano/microspheres onto a commercial PVDF porous substrate. The multiscale microspheres were prepared based on electrostatic interactions between silica nanoparticles (SiNPs) and polystyrene (PS) microsphere. A chemical binding agent, polymer 3-methacryloxypropyltrimethoxysilane (PA174) synthesized via free radical polymerization, was utilized to enhance the adhesion of the particles to the membrane support, leading to a robust structure. The final fluorination step using 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane (17-FAS) attributed the membrane omniphobicity. The water/hexadecane contact angle of the present membrane surface was 176°/138.4°, and the water sliding angle was 7°. Challenged with a hexadecane emulsion feed solution stabilized with the SDS surfactant in membrane distillation, the membrane showed a very stable flux and decrease in conductivity on the permeate side in contrast to decreased flux and increase in permeate conductivity for other benchmark membranes. This performance indicates that omniphobic membranes with hierarchical morphology are promising in addressing membrane wetting and fouling issues in the DCMD processes.
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