Department of Materials, The University of Manchester, Manchester M13 9PL, United Kingdom.
School of Engineering & Materials Science, Queen Mary University of London, Mile End Road E1 4NS, United Kingdom.
Int J Biol Macromol. 2021 Jan 15;167:1479-1490. doi: 10.1016/j.ijbiomac.2020.11.101. Epub 2020 Nov 19.
In this study, a versatile method for the manufacturing of chitosan-grafted porous poly (L-lactic acid) (P-PLLA) nanofibrous membrane by using polydopamine (PDA) as an intermediate layer has been developed. P-PLLA fibres were electrospun and collected as nano/micro fibrous membranes. Highly porous fibres could serve as a substrate for chitosan to adsorb heavy metal ions. Moreover, PDA was used to modify P-PLLA surface to increase the coating uniformity and stability of chitosan. Due to the very high surface area of P-PLLA membranes and abundant amine groups of both PDA and chitosan, the fabricated membranes were utilized as adsorbent for removal of copper (Cu) ions from the wastewater. The adsorption capability of Cu ions was examined with respect to the PDA polymerization times, pH, initial metal ion concentration and time. Finally, the equilibrium adsorption data of chitosan-grafted membranes fitted well with the Langmuir isotherm with the maximum adsorption capacity of 270.27 mg/g.
在这项研究中，开发了一种通过使用聚多巴胺 (PDA) 作为中间层将壳聚糖接枝到多孔聚 (L-丙交酯) (P-PLLA) 纳米纤维膜上的通用方法。P-PLLA 纤维通过静电纺丝收集得到纳米/微纤维膜。高多孔纤维可用作壳聚糖吸附重金属离子的基底。此外，使用 PDA 来修饰 P-PLLA 表面，以提高壳聚糖的涂覆均匀性和稳定性。由于 P-PLLA 膜的比表面积非常高，以及 PDA 和壳聚糖都含有丰富的胺基，因此所制备的膜可用作从废水中去除铜 (Cu) 离子的吸附剂。研究了 PDA 聚合时间、pH 值、初始金属离子浓度和时间对 Cu 离子吸附能力的影响。最后，壳聚糖接枝膜的平衡吸附数据符合 Langmuir 等温线，最大吸附容量为 270.27mg/g。
