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首页> 外文期刊>Journal of Applied Polymer Science >Self-doped sulfonated polyaniline ultrafiltration membranes with enhanced chlorine resistance and antifouling properties
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Self-doped sulfonated polyaniline ultrafiltration membranes with enhanced chlorine resistance and antifouling properties

机译：具有增强的氯抗性和防污性能的自掺杂磺化聚苯胺超滤膜

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摘要

Membranes heavily rely on chlorination to diminish (bio)fouling, but chlorination can also lead to membrane degradation. We developed sulfonated polyaniline (S-PANI) ultrafiltration (UF) membranes with improved chlorine resistance and intrinsic antifouling properties. The S-PANI membranes were synthesized through Non-solvent Induced Phase Separation (NIPS). Membrane performance was evaluated under harsh chlorine conditions (250 ppm sodium hypochlorite for 3 days under different pH conditions). The S-PANI membranes showed improved chlorine resistance including a stable performance without changes in model foulant BSA rejection. In contrast, PANI membranes suffered critical structural damage with complete leakage and commercial PES membranes showed a 76% increase in pure water flux and a noticeable change in BSA rejection. Small changes in S-PANI membrane performance could be linked to membrane structural changes with pH, as confirmed by SEM, IR spectroscopy, and contact angle measurements. Additionally, the S-PANI membranes showed better antifouling properties with a high flux recovery ratio in comparison to PANI membranes using alginic acid, humic acid, and BSA model foulants. Chemical cleaning by sodium hypochlorite re-instated the transport properties to its initial condition. Overall, the developed S-PANI membranes have a high chlorine tolerance and enhanced antifouling properties making them promising for a range of UF membrane applications.
机译：膜严重依赖氯化来减少（生物）污染，但氯化也会导致膜降解。我们开发了磺化聚苯胺（S-PANI）超滤膜，该超滤膜具有更好的耐氯性和固有的防污性能。通过非溶剂诱导相分离（NIPS）合成了S-PANI膜。在苛刻的氯条件下（250 ppm次氯酸钠在不同pH条件下持续3天）评估膜性能。S-PANI膜表现出更好的耐氯性，包括在不改变模型污染物BSA截留率的情况下保持稳定的性能。相比之下，PANI膜遭受严重的结构损伤，完全泄漏，商用PES膜显示纯水通量增加76%，BSA截留率发生显著变化。扫描电镜、红外光谱和接触角测量证实，S-PANI膜性能的微小变化可能与膜结构随pH的变化有关。此外，与使用海藻酸、腐殖酸和BSA模型污染物的PANI膜相比，S-PANI膜具有更好的防污性能和较高的通量回收率。用次氯酸钠进行化学清洗，使运输性能恢复到初始状态。总的来说，开发的S-PANI膜具有很高的耐氯性和增强的防污性能，使其有望用于一系列超滤膜应用。

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