A new low-cost composite ultrafiltration membrane made of polysulfone (PSf) and polystyrene (PS) blend was effectively achieved on the ceramic pozzolan support using dip-coating method. The effect of PS content (5–20 wt%) on membrane properties such as microstructure and filtration performances was investigated. The Fourier-transform infrared spectroscopy, nuclear magnetic resonance, and differential scanning calorimetry analyses confirm that the two polymers lead to physical blend. The morphology analysis shows that PSf/PS membrane layer is homogeneous and strongly adherent on the pozzolan support. Furthermore, the developed membrane was applied for filtration of direct red (DR80) and methyl orange (MO) solutions at a pressure of 3 bar. It was proven that the PS addition significantly enhances the rejection of the membrane companying with a decrease of permeate flux to meet the trade-off selectivity-permeability. The optimized PSf/PS membrane containing 5 wt% of PS has a water permeability of 24 L h⁻¹ m⁻² bar⁻¹, and could reject 91% and 76%, respectively for DR80 and MO. Beside the promising filtration results, the developed membrane is also low-cost thanks to using pozzolan support, and it could be consequently scaled up for the treatment of colored wastewater generated from textile industries.

中文翻译：

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低成本聚砜/聚苯乙烯超滤膜，具有高效去除偶氮染料和优异的有色废水防污性能

采用浸涂法在陶瓷火山灰载体上有效地实现了一种由聚砜 (PSf) 和聚苯乙烯 (PS) 共混物制成的新型低成本复合超滤膜。研究了 PS 含量 (5–20 wt%) 对微观结构和过滤性能等膜特性的影响。傅里叶变换红外光谱、核磁共振和差示扫描量热法分析证实，这两种聚合物会导致物理混合。形态分析表明，PSf/PS 膜层是均匀的，并且牢固地粘附在火山灰载体上。此外，开发的膜用于在 3 巴的压力下过滤直接红 (DR80) 和甲基橙 (MO) 溶液。事实证明，添加 PS 可显着提高膜的截留率，同时降低渗透通量以满足选择性-渗透性的权衡。含有 5 wt% PS 的优化 PSf/PS 膜具有 24 L h 的透水性⁻¹  m ⁻²  bar ⁻¹，并且对于DR80和MO可以分别拒绝91%和76%。除了有希望的过滤效果外，由于使用了火山灰支持，开发的膜成本也很低，因此可以扩大规模，用于处理纺织工业产生的有色废水。