Ministry of Education Key Laboratory of Laser Life Science, Guangdong Provincial Key Laboratory of Laser Life Science, Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China.
Ministry of Education Key Laboratory of Laser Life Science, Guangdong Provincial Key Laboratory of Laser Life Science, Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, South China Normal University, Guangzhou 510631, China.
Int J Biol Macromol. 2024 Jan;256(Pt 1):128398. doi: 10.1016/j.ijbiomac.2023.128398. Epub 2023 Nov 23.
Environmentally friendly and recycled polydopamine-functionalized electrospun poly(vinyl alcohol)/chitosan nanofibers (PVA/CS/PDA) were prepared through a low-energy-consumption procedure. The PDA coating endows PVA/CS/PDA nanofibers with good water stability. The PVA/CS/PDA nanofibers have a fibrillar and porous structure that is favorable for Cu(II) to access the active sites of the nanofibers. The adsorption isotherm and kinetics data preferably conform to the Liu isotherm and pseudo-second-order kinetic models, respectively. The maximum adsorption capacity of Cu(II) ions by PVA/CS/PDA nanofibers from the Liu isotherm model is 326.5 mg g. The PVA/CS/PDA nanofibers exhibit higher adsorption capacity than some other reported adsorbents. The adsorption mechanism study demonstrates that the Cu(II) adsorption is mainly ascribed to the complexation of Cu(II) with the imino, amino, and hydroxy moieties in PVA/CS/PDA nanofibers. The nanofibers can be employed for 5 cycles without significantly deteriorating performance. More interestingly, a fluorometry method based on the oxidation mimic enzyme activity of Cu(II) was developed to detect low concentrations of Cu(II) using the nanofibers as an adsorbent to preconcentrate Cu(II). The limit of detection is 0.42 mg L. The successful removal and detection of Cu(II) in Pearl River and mineral water samples demonstrates the great potential of PVA/CS/PDA nanofibers to remediate Cu(II)-polluted water.
通过低能耗的方法制备了环保且可回收的聚多巴胺功能化静电纺丝聚（乙烯醇）/壳聚糖纳米纤维（PVA/CS/PDA）。PDA 涂层赋予 PVA/CS/PDA 纳米纤维良好的水稳定性。PVA/CS/PDA 纳米纤维具有纤维状和多孔结构，有利于 Cu(II) 进入纳米纤维的活性位点。吸附等温线和动力学数据分别较好地符合 Liu 等温线和拟二级动力学模型。从 Liu 等温线模型可知，PVA/CS/PDA 纳米纤维对 Cu(II)离子的最大吸附容量为 326.5mg/g。与一些其他报道的吸附剂相比，PVA/CS/PDA 纳米纤维表现出更高的吸附容量。吸附机制研究表明，Cu(II)的吸附主要归因于 PVA/CS/PDA 纳米纤维中与氨基、亚氨基和羟基配位的 Cu(II)。纳米纤维可以使用 5 个周期而性能没有明显下降。更有趣的是，开发了一种基于 Cu(II)氧化模拟酶活性的荧光法，使用纳米纤维作为吸附剂来预浓缩 Cu(II)，以检测低浓度的 Cu(II)。检测限为 0.42mg/L。在珠江和矿泉水样品中成功去除和检测 Cu(II)表明 PVA/CS/PDA 纳米纤维在修复 Cu(II)污染水中具有巨大的潜力。
