Siddike Moin Tanvir, Rani Sarkar Mukta, Mahmud Chowdhury Mohammed Farhad, Rahman Mohammed Mizanur, Khan M Nuruzzaman
Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering and Technology, University of Dhaka, Dhaka 1000, Bangladesh.
Institute of Leather Engineering and Technology, University of Dhaka, Dhaka 1000, Bangladesh.
ACS Omega. 2025 May 9;10(19):19294-19313. doi: 10.1021/acsomega.4c08836. eCollection 2025 May 20.
The study reports on the development of innovative hierarchical hybrid nanofibers for the efficient removal of cationic heavy metals and dyes from wastewater. The successful electrospinning of poly-(vinyl alcohol) (PVA) and chitosan (CS) in combination with biosynthesized copper oxide nanoparticle-doped graphene oxide nanocomposites (CuO-GO NCs) at various ratios produced functional nanofibers. The CuO-GO NC was synthesized with a facile one-step method. The cross-linked nanofibers were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), electron microscopy (SEM and TEM), energy-dispersive X-ray (EDX), and thermogravimetric analysis (TGA). SEM results revealed that electrospun nanofibers displayed defect-free uniform spindle-like morphologies with CuO-GO partially embedded onto nanofibers, having average diameters ranging from 52.53 to 65.57 nm. Further, TEM images reveal that CuO-GO is homogeneously dispersed within the nanofiber structure. The thermal analysis demonstrated that the embedded CuO-GO in nanofibers improved the thermal properties and phase change behavior. The nanofibers with 1 wt % CuO-GO performed excellently with a maximum adsorption capacity of 155.23 mg/g for MB dye and 179.9 mg/g for Pb (II) ions. Moreover, the nanofibers exhibited superior removal efficiencies of 89.81% for Pb-(II) ions and 77.67% for MB dye. The optimal pH values for MB dye and Pb-(II) ion adsorption were determined to be 9.1 and 5.5, respectively. The recycling results demonstrated that the cross-linked nanofiber retained excellent stability and performance after four cycles. In this study, 1 wt % CuO-GO-loaded cross-linked PVA/CS nanofibers showed potential adsorption properties for treating MB and Pb (II) ions, making it suitable for wastewater treatment applications with high efficiency.
该研究报告了用于高效去除废水中阳离子重金属和染料的新型分级混合纳米纤维的开发情况。将聚（乙烯醇）（PVA）和壳聚糖（CS）与生物合成的氧化铜纳米颗粒掺杂的氧化石墨烯纳米复合材料（CuO-GO NCs）以不同比例成功进行静电纺丝，制备出了功能性纳米纤维。采用简便的一步法合成了CuO-GO NC。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、电子显微镜（SEM和TEM）、能量色散X射线（EDX）和热重分析（TGA）对交联纳米纤维进行了表征。SEM结果表明，静电纺纳米纤维呈现出无缺陷的均匀纺锤状形态，CuO-GO部分嵌入纳米纤维中，平均直径在52.53至65.57nm之间。此外，TEM图像显示CuO-GO均匀分散在纳米纤维结构内。热分析表明，纳米纤维中嵌入的CuO-GO改善了热性能和相变行为。含1wt%CuO-GO的纳米纤维表现出色，对亚甲基蓝（MB）染料的最大吸附容量为155.23mg/g，对铅（II）离子的最大吸附容量为179.9mg/g。此外，纳米纤维对铅（II）离子的去除效率高达89.81%，对MB染料的去除效率为77.67%。测定出MB染料和铅（II）离子吸附的最佳pH值分别为9.1和5.5。循环利用结果表明，交联纳米纤维在四个循环后仍保持优异的稳定性和性能。在本研究中，负载1wt%CuO-GO的交联PVA/CS纳米纤维对MB和铅（II）离子显示出潜在的吸附性能，使其适用于高效废水处理应用。
