Abstract A re-generable spiral wound module of affinitive electrospun chitosan nanofiber membranes was fabricated, and the feasibility of the module for treating Cr (VI) contaminated water was studied. The effect of flow rate, initial Cr (VI) concentration, chitosan nanofiber deposition density, and other metal ions on Cr (VI) adsorption was investigated in detail. It was found that the loading capacity of the module was dependent on flow rate and nanofiber deposition density, but independent on initial Cr (VI) concentration. Lower flow rate led to higher adsorption capacity. The maximum adsorption capacity obtained with 2 g/m 2 nanofiber membranes in the module was 20.5 mg/g at 10% breakthrough. The module could also adsorb Cu (II), Cd (II) and Pb (II) ions separately but showed good selectivity to Cr (VI) when these metal ions were coexistent. The dynamic adsorption behavior of the module was better fitted by Dose-Response model. Furthermore, the separation of Cr (VI) by commercial nanofiltration (NF) membranes was examined and compared with the spiral wound nanofiber membranes constructed in this work. The result showed the latter had several advantages over the former in terms of rejection, flux and ease of operation.

中文翻译：

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螺旋缠绕壳聚糖纳米纤维膜组件通过死端过滤去除 Cr (VI)

摘要 制备了亲和电纺壳聚糖纳米纤维膜的可再生螺旋缠绕组件，研究了该组件处理六价铬污染水的可行性。详细研究了流速、初始 Cr (VI) 浓度、壳聚糖纳米纤维沉积密度和其他金属离子对 Cr (VI) 吸附的影响。发现模块的负载能力取决于流速和纳米纤维沉积密度，但与初始 Cr (VI) 浓度无关。较低的流速导致较高的吸附容量。在模块中使用 2 g/m 2 纳米纤维膜获得的最大吸附容量在 10% 穿透时为 20.5 mg/g。该模块还可以分别吸附 Cu (II)、Cd (II) 和 Pb (II) 离子，但当这些金属离子共存时，对 Cr (VI) 表现出良好的选择性。模块的动态吸附行为通过剂量响应模型更好地拟合。此外，研究了商业纳滤 (NF) 膜对 Cr (VI) 的分离，并与本工作中构建的螺旋缠绕纳米纤维膜进行了比较。结果表明，后者在剔除率、通量和易于操作方面优于前者。