Here, we report the effect of mixing different amounts of pristine-multiwalled carbon nanotubes (p-MWCNTs) with the cellulose acetate (CA) on dye removal. The p-MWCNTs loadings of the composites were varied from 0 to 1.0 wt%, and the non-solvent-induced phase separation methodology was used to fabricate the composite membranes, which were extensively characterized. The rheological tests confirmed that with 1.0 wt% of p-MWCNTs there was a classical filler effect in the viscoelastic behavior of the composite solution, but with no percolation of CNTs. The ATR-FTIR spectra identified specific interactions between CNTs and acetate groups of CA. SEM images showed a top dense layer sustained by a porous support layer consisting of a sponge-like structure in the middle layer. Aggregates of CNTs were seen at higher loadings of CNTs (> 0.1 wt%). The XRD diffractograms of composite membranes showed peak shifts compared to CA membranes due to the presence of CNTs into the CA structure, and their thermal stability was effective up to 320 °C. From the water permeability experiments, the calculated values of the membrane hydraulic resistance (Rm) of the composites were higher since a dense top layer and reduced pore size were achieved. Among all the composite membranes, M7 and M8 had the most desirable antifouling properties due to the high surface hydrophilicity imparted by the CNTs, and also showed an improvement in the removal of methylene blue (MB).

中文翻译：

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用于去除亚甲蓝的原始多壁碳纳米管/醋酸纤维素复合材料的制备

在这里，我们报告了将不同数量的原始多壁碳纳米管 (p-MWCNT) 与醋酸纤维素 (CA) 混合对染料去除的影响。复合材料的 p-MWCNTs 负载量从 0 到 1.0 wt% 不等，并且使用非溶剂诱导相分离方法来制造复合膜，该膜得到了广泛的表征。流变学测试证实，使用 1.0 wt% 的 p-MWCNTs 时，复合溶液的粘弹性行为具有典型的填料效应，但没有 CNT 的渗透。ATR-FTIR 光谱确定了 CNT 和 CA 乙酸酯基团之间的特定相互作用。SEM 图像显示顶部致密层由多孔支撑层支撑，该支撑层由中间层中的海绵状结构组成。在更高的 CNT 负载量 (> 0.1 wt%) 下可以看到 CNT 的聚集体。由于碳纳米管存在于 CA 结构中，复合膜的 XRD 衍射图显示与 CA 膜相比峰位移，并且它们的热稳定性在高达 320°C 时有效。从透水性实验中，复合材料的膜水力阻力 (Rm) 的计算值较高，因为实现了致密的顶层和减小的孔径。在所有复合膜中，由于碳纳米管赋予的高表面亲水性，M7 和 M8 具有最理想的防污性能，并且在去除亚甲基蓝 (MB) 方面也表现出改善。由于实现了致密的顶层和减小的孔径，复合材料的膜水力阻力 (Rm) 的计算值更高。在所有复合膜中，由于碳纳米管赋予的高表面亲水性，M7 和 M8 具有最理想的防污性能，并且在去除亚甲基蓝 (MB) 方面也表现出改善。由于实现了致密的顶层和减小的孔径，复合材料的膜水力阻力 (Rm) 的计算值更高。在所有复合膜中，由于碳纳米管赋予的高表面亲水性，M7 和 M8 具有最理想的防污性能，并且在去除亚甲基蓝 (MB) 方面也表现出改善。