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首页> 外文期刊>Journal of Applied Polymer Science >Inherent porous structure modified by titanium dioxide nanoparticle incorporation and effect on the fouling behavior of hybrid poly(vinylidene fluoride) membranes
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Inherent porous structure modified by titanium dioxide nanoparticle incorporation and effect on the fouling behavior of hybrid poly(vinylidene fluoride) membranes

机译：二氧化钛纳米粒子结合改性的固有多孔结构及其对杂化聚偏二氟乙烯膜结垢行为的影响

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The incorporation of nanoparticles (NPs) into a casting solution is a widely used practice for controlling the membrane fouling tendency, but the specific role of NPs in fouling control from an internal porous structure optimization has seldom been investigated. In this study, we evaluated the specific role of titanium dioxide (TiO2)-NPs (Degussa P25) in mitigating membrane organic fouling. We prepared the membranes by tailoring the concentrations of the NPs well; this resulted in an optimized membrane microstructure consisting of fingerlike voids (beneath the skin layer of the membrane) and spongy voids (adjacent to the fingerlike voids). The NP incorporation induced the formation of spongy voids beneath the skin layer, and the increase in the NP concentration increased the formation of spongy voids. Moreover, surface images obtained by scanning electron microscopy, X-ray photoelectron spectroscopy results, and contact angles confirmed that TiO2-NPs were almost absent on the skin layer. Antifouling experiments were performed with a model organic foulant in two flow orientations [fingerlike voids facing the retentate (FVR) and spongy voids facing the retentate (SVR)]. The results show that the membrane fluxes in FVR decreased more than those in SVR. The membrane with 1.5 wt % TiO2 operated in SVR exhibited the lowest flux decline; this suggested that spongy voids with TiO2 exposure could mitigate fouling to a greater extent. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43265.
机译：将纳米颗粒（NPs）引入流延溶液中是控制膜结垢趋势的广泛实践，但是很少研究了内部多孔结构优化对NPs在结垢控制中的特定作用。在这项研究中，我们评估了二氧化钛（TiO2）-NP（Degussa P25）在减轻膜有机污染方面的特定作用。我们通过适当调整NP的浓度来制备膜。这导致了由指状空隙（在膜的皮肤层之下）和海绵状空隙（与指状空隙相邻）组成的优化的膜微结构。 NP的掺入诱导了在皮肤层下面的海绵状空隙的形成，并且NP浓度的增加增加了海绵状空隙的形成。此外，通过扫描电子显微镜，X射线光电子能谱获得的表面图像得到结果，并且接触角证实在皮肤层上几乎不存在TiO 2 -NP。在两个流动方向上使用模型有机污垢剂进行了防污实验[面向渗余物的指状空隙（FVR）和面向渗余物的海绵状空隙（SVR）]。结果表明，FVR的膜通量下降幅度大于SVR。在SVR中操作的TiO2含量为1.5 wt％的膜表现出最低的通量下降。这表明，暴露在TiO2中的海绵状孔隙可在更大程度上减轻结垢。 （c）2015 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43265。

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