This study synthesized a nanocomposite based on quaternary branched polyethyleneimine containing sodium alginate and graphene oxide and characterized by FE‐SEM, EDX‐MAP, XRD, FT‐IR, and TGA and used as an efficient sorbent for the removal of nitrate ions. The maximum ion exchange in optimized conditions was discovered to be 75%. The experimental studies showed that nitrate removal follows the pseudo‐first‐order model due to more consonance. Also, Weber–Morris and Boyd models suggested that the nitrate ions adsorption on the surface of nanocomposite is not controlled only by the intraparticle diffusion step. Moreover, Langmuir, Redlich–Peterson, and Hill models exhibited high regression coefficients of 0.991, 0.993, and 0.992, respectively. Thermodynamic studies confirmed the adsorption system was spontaneous and exothermic. Recovery assay showed that more than 98% of the nitrate ion exchanged by the nanocomposite was regenerated and nanocomposite could be reused seven cycles without efficacy reducing significantly. The nanocomposite showed excellent antibacterial activity against Staphylococcus aureus and Escherichia coli cells, with minimum inhibitory concentrations of 62.5 and 125 μg mL−1, and zone of growth inhibition of 17.5 ± 0.5 and 10.5 ± 0.5 mm, respectively. The results represented that the introduced nanocomposite is a useful material for the removal of nitrate ions from aqueous solution and has antibacterial properties.

中文翻译：

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用于去除水溶液中 NO3− 离子的四元支化聚乙烯亚胺纳米复合材料

本研究合成了一种基于含有海藻酸钠和氧化石墨烯的四元支化聚乙烯亚胺的纳米复合材料，并通过 FE-SEM、EDX-MAP、XRD、FT-IR 和 TGA 进行了表征，并用作去除硝酸根离子的有效吸附剂。发现优化条件下的最大离子交换率为 75%。实验研究表明，由于更一致，硝酸盐去除遵循伪一阶模型。此外，韦伯-莫里斯和博伊德模型表明，纳米复合材料表面的硝酸根离子吸附不仅仅由颗粒内扩散步骤控制。此外，Langmuir、Redlich-Peterson 和 Hill 模型分别表现出较高的回归系数，分别为 0.991、0.993 和 0.992。热力学研究证实吸附系统是自发且放热的。回收率测定表明，纳米复合材料交换的硝酸根离子98%以上被再生，纳米复合材料可以重复使用7个周期，功效没有明显降低。纳米复合材料对细菌表现出优异的抗菌活性金黄色葡萄球菌和大肠杆菌细胞，最低抑制浓度为 62.5 和 125 μg mL−1，生长抑制区分别为 17.5 ± 0.5 和 10.5 ± 0.5 mm。结果表明，引入的纳米复合材料是一种用于去除水溶液中硝酸根离子的有用材料，并且具有抗菌性能。