Development of Mixed-Dimensional Membranes Comprising Halloysite Nanotubes and Kevlar Aramid Nanofiber for Enhanced Small-Molecule Dye/Salt Separation
Development of Mixed-Dimensional Membranes Comprising Halloysite Nanotubes and Kevlar Aramid Nanofiber for Enhanced Small-Molecule Dye/Salt Separation
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DOI：
10.1021/acs.iecr.2c04103
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Yanqing Xu;Yuying Zhu;Qi-Hang Qiu;Zhifu Qi;Shenghui Liu;Jianquan Weng;Jiangnan Shen
中科院分区：
文献类型：
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作者：
Yanqing Xu;Yuying Zhu;Qi-Hang Qiu;Zhifu Qi;Shenghui Liu;Jianquan Weng;Jiangnan Shen
本研究通过将硬质埃洛石纳米管（HNTs）和软质芳纶纤维（KANF）复合，制备了具有分离小分子染料/盐混合物能力的新型混合维纳滤膜[埃洛石纳米管（HNTs）/芳纶纤维（KANF）]。通过HNTs中空结构的特殊结构为水分子和盐离子传输提供额外的通道，设计了从染料/盐混合物溶液中分离低分子染料的相当大的筛分。HNTs/KANF复合膜的水通量为30%时的8倍（39.2 L m-2 h-1）的无HNTs的膜，盐的低截留率（Na_2SO_4为21.7%，NaCl为7.7%），对各种染料的截留率高（考马斯亮蓝G-250为98.7%，刚果红为95.3%，铬黑T为99.5%，金莲橙O为98.0%）。此外，由于HNTs的亲水性和KANF的高度有序和致密结构，HNTs/KANF混合维膜具有优异的抗污染性能和长期稳定性。本研究为通过添加具有特殊结构的纳米材料来提高纳滤膜的渗透性和选择性提供了思路。
In this work, the novel mixed-dimensional nanofiltration membranes [halloysite nanotubes (HNTs)/Kevlar aramid nanofiber (KANF)] with the ability to separate small-molecule dye/salt mixtures were prepared by comprising the rigid HNTs and the soft KANF. The considerable sieving in separating low-molecule dyes from dye/salt mixture solution was designed via the provision of additional channels for water molecules and salt ion transport via the special structure of the hollow structure of HNTs. The optimal 30% HNTs/KANF membrane displayed an eightfold water flux (39.2 L m–2h–1) of the HNTs-free membrane, the low rejection of salts (21.7% for Na2SO4and 7.7% for NaCl), and high rejection of various dyes (98.7% for Coomassie brilliant blue G-250, 95.3% for Congo red, 99.5% for Eriochrome black T, and 98.0% for Tropaeolin O). Besides, owing to the hydrophilicity of HNTs and the highly ordered and compact structure of KANF, the HNTs/KANF mixed-dimensional membrane showed excellent antipollution performance and long-term stability. This study provides some ideas for improving the permeability and selectivity of nanofiltration membranes by adding nanomaterials with special structures.