Alkhouzaam Abedalkader, Qiblawey Hazim, Khraisheh Majeda
Department of Chemical Engineering, College of Engineering, Qatar University, P.O. Box 2713 Doha, Qatar.
Membranes (Basel). 2021 Jan 27;11(2):86. doi: 10.3390/membranes11020086.
High-degree functionalization of graphene oxide (GO) nanoparticles (NPs) using polydopamine (PDA) was conducted to produce polydopamine functionalized graphene oxide nanoparticles (GO-PDA NPs). Aiming to explore their potential use as nanofiller in membrane separation processes, the spectral and structural properties of GO-PDA NPs were comprehensively analyzed. GO NPs were first prepared by the oxidation of graphite via a modified Hummers method. The obtained GO NPs were then functionalized with PDA using a GO:PDA ratio of 1:2 to obtain highly aminated GO NPs. The structural change was evaluated using XRD, FTIR-UATR, Raman spectroscopy, SEM and TEM. Several bands have emerged in the FTIR spectra of GO-PDA attributed to the amine groups of PDA confirming the high functionalization degree of GO NPs. Raman spectra and XRD patterns showed different crystalline structures and defects and higher interlayer spacing of GO-PDA. The change in elemental compositions was confirmed by XPS and CHNSO elemental analysis and showed an emerging N 1s core-level in the GO-PDA survey spectra corresponding to the amine groups of PDA. GO-PDA NPs showed better dispersibility in polar and nonpolar solvents expanding their potential utilization for different purposes. Furthermore, GO and GO-PDA-coated membranes were prepared via pressure-assisted self-assembly technique (PAS) using low concentrations of NPs (1 wt. %). Contact angle measurements showed excellent hydrophilic properties of GO-PDA with an average contact angle of (27.8°).
使用聚多巴胺（PDA）对氧化石墨烯（GO）纳米颗粒（NPs）进行高度功能化处理，以制备聚多巴胺功能化氧化石墨烯纳米颗粒（GO-PDA NPs）。为了探索它们作为膜分离过程中纳米填料的潜在用途，对GO-PDA NPs的光谱和结构性质进行了全面分析。首先通过改进的Hummers方法对石墨进行氧化制备GO NPs。然后使用1:2的GO:PDA比例用PDA对获得的GO NPs进行功能化，以获得高度胺化的GO NPs。使用XRD、FTIR-UATR、拉曼光谱、SEM和TEM评估结构变化。GO-PDA的FTIR光谱中出现了几个归因于PDA胺基的谱带，证实了GO NPs的高功能化程度。拉曼光谱和XRD图谱显示了不同的晶体结构和缺陷以及GO-PDA更大的层间距。通过XPS和CHNSO元素分析证实了元素组成的变化，并且在GO-PDA的调查光谱中出现了与PDA胺基相对应的新的N 1s核心能级。GO-PDA NPs在极性和非极性溶剂中表现出更好的分散性，扩大了它们在不同用途中的潜在应用。此外，使用低浓度的NPs（1 wt.%）通过压力辅助自组装技术（PAS）制备了GO和GO-PDA涂层膜。接触角测量显示GO-PDA具有优异的亲水性，平均接触角为（27.8°）。
