In this research, chitosan nanobiopolymers (CS-NPs) were synthesized using tripoly phosphate and transferred into the organic solvent via solvent exchange method. Different amounts of chitosan nanopolymers were embedded into the polyethersulfone (PES) membrane prepared by phase inversion precipitation method. The membranes were employed for nitrate removal from water under various solution pHs (4.5, 7.0 and 9.0). Scanning electron microscopy, atomic force microscopy, porosity, water contact angle and pure water flux measurements were employed to characterize the fabricated membranes. Addition of chitosan nanoparticles into the membrane matrix increased the water permeability from 13 for pristine membrane to 22 kg/m² h for modified membrane with 0.2 wt.% nanopolymer. However, the application of CS-NPs more than 0.4 wt.% led to membranes with a compact matrix and dense structure, thereby reducing water permeation even lower than PES. At all tested solution pHs, nitrate removal efficiency was significantly improved in comparison with pristine PES at as a result of adsorptive properties of chitosan biopolymer. The complete nitrate removal (100%) was achieved at acidic pH due to protonation of amine groups of CS-NPs creating positive charge on the membrane surface.

在这项研究中，使用三聚磷酸酯合成了壳聚糖纳米生物聚合物（CS-NPs），并通过溶剂交换法将其转移到有机溶剂中。通过相转化沉淀法制备的聚醚砜（PES）膜中嵌入了不同数量的壳聚糖纳米聚合物。该膜用于在各种溶液pH（4.5、7.0和9.0）下从水中去除硝酸盐。使用扫描电子显微镜，原子力显微镜，孔隙率，水接触角和纯水通量测量来表征所制造的膜。将壳聚糖纳米颗粒添加到膜基质中后，透水率从原始膜的13提高到22 kg / m ^2。 h为具有0.2wt。％的纳米聚合物的改性膜。然而，CS-NPs的用量大于0.4wt。％导致膜具有致密的基质和致密的结构，从而降低了甚至低于PES的水渗透性。在所有测试溶液的pH值下，由于壳聚糖生物聚合物的吸附性能，与原始PES相比，硝酸盐去除效率得到了显着提高。由于CS-NPs胺基的质子化在膜表面产生正电荷，因此在酸性pH值下硝酸盐被完全去除（100％）。