The desirability of acid-resistant nanofiltration (NF) membranes having superior acid stability with good separation performance for industrial acid wastewater treatment and reclamation is currently in high demand. Here, we presented a new sulfonated-based acid-resistant NF membrane prepared by the crosslinking and participation action of 3,3′-diaminodiphenyl sulfone (DDS) via the synthesis of branched polyethyleneimine (BPEI) and 1,3-benzenedisulfonyl chloride (BDSC). By optimizing the preparation conditions, the BP-DDS/BD membrane exhibited an improved pure water flux of 13.4 L m⁻² h⁻¹ bar⁻¹ and a MgCl₂ rejection of 97.3% for 1000 ppm. It also shows desirable rejection (>90%) and adsorption capacities for selected heavy metals. In addition, an excellent pressure resistance at different operating bars was achieved. Benefiting from the strong and stable SO bond present in DDS, the optimized BP-DDS/BD membrane displayed an outstanding acid stability at different acid immersion conditions while also maintaining impressive long-term stability of 240 h after 30 days acid exposure period. The polysulfonamide (PSA)-based NF membrane presented in this work therefore demonstrated viable and promising usefulness in wastewater treatment containing acid and heavy metal ions removal.

耐酸纳滤 (NF) 膜具有优异的酸稳定性和良好的分离性能，用于工业酸性废水处理和回收，目前需求量很大。在这里，我们展示了一种新型的磺化基耐酸纳滤膜，它是由 3,3'-二氨基二苯砜 (DDS) 通过合成支化聚乙烯亚胺 (BPEI) 和 1,3-苯二磺酰氯 (BDSC) 的交联和参与作用制备的。 ）。通过优化制备条件，BP-DDS/BD 膜的纯水通量提高了 13.4 L m ^-2  h ^-1 bar ^-1和 MgCl ₂1000 ppm 的拒绝率为 97.3%。它还显示了对选定重金属的理想排斥 (>90%) 和吸附能力。此外，在不同的操作杆下实现了出色的耐压性。得益于DDS 中存在的强而稳定的 S O 键，优化后的 BP-DDS/BD 膜在不同的酸浸条件下表现出出色的酸稳定性，同时在 30 天的酸暴露期后还保持了令人印象深刻的 240 小时的长期稳定性。因此，在这项工作中提出的基于聚磺酰胺 (PSA) 的 NF 膜在去除酸和重金属离子的废水处理中表现出可行和有希望的用途。