Nonwoven carbon nanotube (CNT) laminates were characterized as support-free membranes for water filtration in terms of structural morphology, water permeability, selectivity and chemical resistance. Nominal pore rating (12–23 nm) estimated by rejection of globular proteins and fluorescence beads fall within the selectivity range of tight ultrafiltration (UF) membranes applied for wastewater treatment. The membranes displayed high permeability (120–400 LMH/bar). High selectivity regardless of high permeability seems to be due to tortuosity and pore structure of the membranes (25–50 μm thickness). The chemical stability of the membranes was tested towards common chemicals used for membrane cleaning (HCl, NaOH, NaClO) but at much severe conditions (24 h exposure at 4–10 fold higher concentrations). High resolution-X-ray photoelectron spectroscopy (XPS) was applied to evaluate chemical resistance. The relative C/O-carbon to oxygen ratio and typical deconvolution curves of C1s lines of the membranes after 24 h exposure depicted no significant changes compared to the reference samples, confirming resistance to chemical oxidation. This combination of features, added to simplicity of fabrication and post-synthesis modification and support-free configuration that enhances chemical stability, offer a worthwhile opportunity of application of these dense-array outer-walled CNT membranes in the UF range, especially at harsh conditions such as wastewater treatment.

就结构形态，透水性，选择性和耐化学性而言，非织造碳纳米管（CNT）层压板被表征为用于水过滤的无支撑膜。通过排斥球状蛋白和荧光珠估计的标称孔径等级（12–23 nm）落在用于废水处理的紧密超滤（UF）膜的选择性范围内。膜显示出高渗透性（120-400 LMH / bar）。不管高渗透率如何，高选择性似乎是由于膜的曲折性和孔结构（厚度为25–50μm）所致。膜的化学稳定性针对膜清洁所用的常见化学物质（HCl，NaOH，NaClO）进行了测试，但条件非常恶劣（浓度为4-10倍，暴露24小时）。高分辨率X射线光电子能谱（XPS）用于评估耐化学性。暴露24 h后，相对的C / O-碳与氧比率和膜的C1s线的典型反褶积曲线与参考样品相比无明显变化，证实了其对化学氧化的抵抗力。这些功能的组合增加了制造的简便性，合成后的修饰以及增强化学稳定性的无支撑配置，为这些致密阵列外壁CNT膜在超滤范围内的应用提供了宝贵的机会，尤其是在苛刻的条件下如废水处理。暴露24 h后，相对的C / O-碳与氧比率和膜的C1s线的典型反褶积曲线与参考样品相比无明显变化，证实了其对化学氧化的抵抗力。这些功能的组合增加了制造的简便性，合成后的修饰以及增强化学稳定性的无支撑配置，为这些致密阵列外壁CNT膜在超滤范围内的应用提供了宝贵的机会，尤其是在苛刻的条件下如废水处理。暴露24 h后，相对的C / O-碳与氧比率和膜的C1s线的典型反褶积曲线与参考样品相比无明显变化，证实了其对化学氧化的抵抗力。这些功能的组合增加了制造的简便性，合成后的修饰以及增强化学稳定性的无支撑配置，为这些致密阵列外壁CNT膜在超滤范围内的应用提供了宝贵的机会，尤其是在苛刻的条件下如废水处理。