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首页> 外文期刊>RSC Advances >Highly effective and reusable sulfonated pentablock copolymer nanocomposites for water purification applications
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Highly effective and reusable sulfonated pentablock copolymer nanocomposites for water purification applications

机译：用于水净化应用的高效可重复使用的磺化五嵌段共聚物纳米复合材料

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Nanocomposite membranes based on the use of a sulfonated pentablock copolymer (s-PBC) were prepared and investigated for the first time for water purification applications. The s-PBC is a thermoplastic elastomer with discrete sequences of ionic (sulfonated) and non-ionic (unsulfonated) blocks. Titania particles and graphene oxide (GO) were dispersed in the polymeric matrix and nanocomposite membranes (named s-PBC–TiO2 and s-PBC–GO, respectively) were prepared by drop casting. The chemical, structural and morphological properties of the nanocomposite membranes were characterized by scanning electron microscopy (SEM), Raman spectroscopy, X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The adsorption properties and the photocatalytic activity of such nanocomposite membranes were investigated by analysing the removal of dyes from water solutions and the degradation of methylene blue (MB) and methyl orange (MO) under UV-visible light irradiation. The role played by the direct interaction of the polymer with the contaminant is also considered. Both the s-PBC–GO and s-PBC–TiO2 nanocomposites show high efficiency in dyes adsorption and photocatalytic degradation. All the nanocomposites investigated in the present study are able to degrade more than the 90% of the initial MB concentration either in dark or under irradiation. The introduction of the fillers in s-PBC favors a fast formation of MB aggregates. MO dye removal from water is efficiently achieved by s-PBC–GO and s-PBC–TiO2. In particular, s-PBC–GO is a safer material to be used for MO removal with respect to s-PBC–TiO2, since in the first case no formation of aromatic intermediate compounds is observed under UV-visible light irradiation.
机译：制备了基于磺化五嵌段共聚物（s-PBC）的纳米复合膜，并首次进行了水净化应用的研究。 s-PBC是一种热塑性弹性体，具有离散的离子（磺化）和非离子（未磺化）嵌段序列。将二氧化钛颗粒和氧化石墨烯（GO）分散在聚合物基质中，并制备了纳米复合膜（分别命名为s-PBC-TiO 2 和s-PBC-GO）。通过滴铸。通过扫描电子显微镜（SEM），拉曼光谱，X射线衍射（XRD）和热重分析（TGA）对纳米复合膜的化学，结构和形态特性进行了表征。通过分析可见光下水溶液中染料的去除以及亚甲基蓝（MB）和甲基橙（MO）的降解，研究了这种纳米复合膜的吸附性能和光催化活性。还考虑了聚合物与污染物的直接相互作用所起的作用。 s-PBC-GO和s-PBC-TiO 2 纳米复合材料在染料吸附和光催化降解方面均表现出很高的效率。在本研究中研究的所有纳米复合材料，无论在黑暗中还是在辐射下，都能够降解超过初始MB浓度90％的物质。在s-PBC中引入填料有利于MB聚集体的快速形成。 s-PBC-GO和s-PBC-TiO 2 可以有效地从水中去除MO染料。特别是，相对于s-PBC-TiO 2 ，s-PBC-GO是一种更安全的MO去除材料，因为在第一种情况下没有形成在紫外-可见光辐射下观察到芳族中间体化合物。

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