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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >A facile route to enhance the water flux of a thin-film composite reverse osmosis membrane: incorporating thickness-controlled graphene oxide into a highly porous support layer
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A facile route to enhance the water flux of a thin-film composite reverse osmosis membrane: incorporating thickness-controlled graphene oxide into a highly porous support layer

机译：增强薄膜复合反渗透膜水通量的便捷途径：将厚度受控的氧化石墨烯掺入高度多孔的支撑层中

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In this study, we demonstrated that a reduction in solely the concentration of the polymer solution for preparation of the support layer effectively enhances the water flux of a thin-film composite (TFC) reverse osmosis (RO) membrane. However, a decrease in the polymer concentration caused the subsurface structure of the support layer to become too porous, which unavoidably weakened the mechanical strength of the support layer. To overcome the problem, we prepared a highly porous support layer with improved mechanical strength by incorporating graphene oxide (GO) platelets. The thickness of the GO platelets was controlled by adjusting the mechanical energy input per volume of the precursor solution. We confirmed that well-exfoliated GO platelets (mean thickness: about 1.5 nm) are more effective in enhancing the mechanical properties of the support layer. The TFC RO membrane made of the GO composite support layer had almost 1.6 to 4 times higher water flux with comparable salt rejection compared to both the current upper bounds of the RO membranes prepared by modification of the active layer and commercial RO membranes.
机译：在这项研究中，我们证明了仅降低用于制备支撑层的聚合物溶液的浓度，就可以有效地提高薄膜复合材料（TFC）反渗透（RO）膜的水通量。然而，聚合物浓度的降低导致支撑层的地下结构变得过于多孔，这不可避免地削弱了支撑层的机械强度。为了克服该问题，我们通过掺入氧化石墨烯（GO）血小板制备了具有改善的机械强度的高度多孔的支撑层。通过调节每体积前体溶液的机械能输入来控制GO血小板的厚度。我们证实，充分剥落的GO血小板（平均厚度：约1.5 nm）在增强支撑层的机械性能方面更有效。由GO复合支撑层制成的TFC RO膜与通过改性活性层和市售RO膜制备的RO膜的当前上限相比，具有高近1.6至4倍的水通量和相当的脱盐率。

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