Thin film composite polyesteramide nanofiltration membranes were fabricated with interfacial polymerization from carboxylated chitosan and trimesoyl chloride on a microporous polysulfone support membrane. Salt rejection was improved by building a multiple-layer structure that was formed by sequentially repeating the cycles of the interfacial reactions. The chemical structure, surface morphology and charge were characterized for the polyesteramide top layer. The effects of the concentrations of the reactant solutions and the number of cycles of reactant depositions and reactions on the separation performance were investigated. The single-layer polyesteramide membrane produced from 3.5 wt% carboxylated chitosan and 0.7 wt% TMC has a negatively charged surface and shows favorable separation performance: pure water permeation flux of 7.3 L/(m 2 h) at 0.6 MPa gauge feed pressure, and salt rejection of 95.0% for Na 2 SO 4 , 65.7% for MgSO 4 , 33.2% for MgCl 2 and 66.3% for NaCl. The multiple-layer polyesteramide membranes show a more negatively charged surface and higher salt rejection than the single-layer polyesteramide membranes. The single-layer polyesteramide membrane PS-[(C-CS) 1.0 /TMC] with a relatively loose structure shows good retention for the reactive black 5 anionic dye. This study opens an interesting research area to explore a new type of thin film composite nanofiltration membrane.

中文翻译：

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羧化壳聚糖和均苯三甲酰氯制备的薄膜复合聚酯酰胺纳滤膜

薄膜复合聚酯酰胺纳滤膜由羧化壳聚糖和均苯三甲酰氯在微孔聚砜支撑膜上界面聚合而成。通过构建通过连续重复界面反应循环而形成的多层结构来提高盐的截留率。表征了聚酯酰胺顶层的化学结构、表面形态和电荷。研究了反应物溶液的浓度和反应物沉积和反应的循环次数对分离性能的影响。由 3.5 wt% 羧化壳聚糖和 0.7 wt% TMC 制备的单层聚酯酰胺膜具有带负电荷的表面并显示出良好的分离性能：纯水渗透通量为 7。在 0.6 MPa 表压进料压力下为 3 L/(m 2 h)，Na 2 SO 4 的脱盐率为 95.0%，MgSO 4 为 65.7%，MgCl 2 为 33.2%，NaCl 为 66.3%。与单层聚酯酰胺膜相比，多层聚酯酰胺膜显示出更多的负电荷表面和更高的盐截留率。结构相对松散的单层聚酯酰胺膜PS-[(C-CS) 1.0 /TMC]对活性黑5阴离子染料显示出良好的保留。本研究为探索新型薄膜复合纳滤膜开辟了一个有趣的研究领域。结构相对松散的单层聚酯酰胺膜PS-[(C-CS) 1.0 /TMC]对活性黑5阴离子染料显示出良好的保留。本研究为探索新型薄膜复合纳滤膜开辟了一个有趣的研究领域。结构相对松散的单层聚酯酰胺膜PS-[(C-CS) 1.0 /TMC]对活性黑5阴离子染料显示出良好的保留。本研究为探索新型薄膜复合纳滤膜开辟了一个有趣的研究领域。