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Modified Chitosan Nanofiber Membrane Fabrication for Removal of Pb2+ from Coptidis rhizoma Decoction
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2024-12-18 , DOI: 10.1021/acs.iecr.4c02261
Yafei Ma, Ruobing Yang, Xinman Liu, Zhiping Fu, Yuexin Guo, Hui Wang, Zhiqian Jia, Chunxue Song

Heavy metals in medicine are easily introduced during production and processing, and heavy metals pose a risk to human health. To realize the separation of heavy metals from medicine and provide a new method for removing heavy metals, in this study, ethylenediaminetetraacetic acid (EDTA) was used to modify chitosan, and the ethylenediaminetetraacetic acid-modified chitosan (CS-EDTA) fiber membrane was prepared through electrospinning to remove lead ions from Coptidis rhizoma decoction. The effects of spinning speed (0.1 mL/h), modification method (2 g Na2EDTA, 0.1 g EDC, 0.2 g NHS), and pH (pH = 5) on the adsorption capacity were studied. The results showed that the adsorption of Pb2+ on the CS-EDTA membrane was pseudo-second-order kinetics model (R2 > 0.999) and the Langmuir model (R2 > 0.978). The kinetic maximum adsorption capacity of the CS-EDTA membrane was 116.2 mg·g–1. The Pb2+ content in C. rhizoma decoction after adsorption meets the limit requirements for heavy metals specified in the traditional Chinese medicine standard (Pb2+ ≤ 5 mg·kg–1). The chemical composition of the decoction of C. rhizoma did not change significantly after the removal of Pb2+. The membrane has antibacterial properties against Gram-negative bacteria.

中文翻译:


改性壳聚糖纳米纤维膜制备去除黄连根瘤汤中 Pb2+



医药中的重金属在生产和加工过程中容易引入,重金属对人体健康构成风险。为实现重金属与药物的分离,提供去除重金属的新方法,本研究采用乙二胺四乙酸(EDTA)对壳聚糖进行改性,并通过静电纺丝制备乙二胺四乙酸改性壳聚糖(CS-EDTA)纤维膜,以去除黄连根瘤汤中的铅离子。研究了纺丝速度 (0.1 mL/h)、改性方法 (2 g Na2EDTA、0.1 g EDC、0.2 g NHS) 和 pH 值 (pH = 5) 对吸附能力的影响。结果表明,Pb2+ 在 CS-EDTA 膜上的吸附为准二级动力学模型 (R2 > 0.999) 和 Langmuir 模型 (R2 > 0.978)。CS-EDTA 膜的动力学最大吸附容量为 116.2 mg·g–1。吸附后根菌汤剂中 Pb2+ 含量满足中医标准规定的重金属限量要求 (Pb2+ ≤ 5 mg·kg–1)。去除 Pb2+ 后,C. rhizoma 汤剂的化学成分没有显着变化。该膜对革兰氏阴性菌具有抗菌特性。
更新日期:2024-12-18
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