High flux thin-film nanocomposites with embedded boron nitride nanotubes for nanofiltration
High flux thin-film nanocomposites with embedded boron nitride nanotubes for nanofiltration
复制标题
DOI：
10.1016/j.memsci.2019.117749
复制
发表时间：
2020-03-01
影响因子：
9.5
通讯作者：
Mattia, Davide
中科院分区：
文献类型：
--
作者：
Casanova, Serena;Liu, Tian-Yin;Mattia, Davide
将氮化硼纳米管（BNNTs）引入到通过界面聚合制备的聚酰胺（PA）薄选择层中，得到了一种新型的薄膜纳米复合（TFN）膜。仅添加0.02wt%的BNNT导致纯水渗透性增加4倍，与纯PA膜相比，对二价盐、亚甲基蓝或腐殖酸的截留率没有损失。高于0.02wt%的BNNT的负载导致附聚，同时整体性能损失。对于含有0.02wt%BNNT的膜，纯水渗透率为4.5LMH@bar，MgSO 4截留率>90%，CaCl 2截留率>80%。用腐殖酸进行的结垢测试显示，与仅聚酰胺的膜相比，在结垢循环期间通量恢复率>95%，通量损失降低约50%。这些值代表了对商业聚酰胺膜和掺入碳纳米管的TFN膜的显著改进。我们断言，产生增强的性能所需的非常少量的BNNT为它们在纳滤膜受到严重有机污染的水处理应用中的使用开辟了道路。
A novel thin film nanocomposite (TFN) membrane was obtained by incorporating boron nitride nanotubes (BNNTs) into a polyamide (PA) thin selective layer prepared via interfacial polymerisation. The addition of just 0.02 wt% of BNNTs led to a 4-fold increase in pure water permeance with no loss in rejection for divalent salts, methylene blue or humic acid compared to the pure PA membrane. Loadings higher than 0.02 wt% of BNNTs led to agglomeration with overall loss of performance. For the membranes containing 0.02 wt% BNNTs, the pure water permeance was 4.5 LMH@bar, with >90% rejection of MgSO4 and >80% rejection of CaCl2. Fouling tests with humic acid showed a flux recovery ratio of >95% with similar to 50% lower flux loss during the fouling cycle compared to the polyamide only membrane. These values represent a significant improvement over both commercial polyamide membranes and TFN membranes incorporating carbon nanotubes. We assert that the very small quantity of BNNTs needed to produce the enhanced performance opens the way to their use in water treatment applications where nanofiltration membranes are subject to severe organic fouling.