Waly Saadia M, El-Wakil Ahmad M, Waly Mohamed M, El-Maaty Weam M Abou, Awad Fathi S
Chemistry Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt.
Chemistry Department, Faculty of Science, New Mansoura University, New Mansoura, 35712, Egypt.
Sci Rep. 2025 May 3;15(1):15555. doi: 10.1038/s41598-025-98115-8.
In this study, graphene oxide (GO) nanosheets were chemically modified by attaching polyaniline (PAN) nanoparticles to their surfaces, creating a polyaniline partially reduced graphene oxide composite (PAN@PRGO). This synthesized PAN@PRGO nanocomposite serves as an innovative and highly effective adsorbent for removing indigo carmine (IC) dye from water. The morphology and chemical composition of PAN@PRGO were analyzed using various techniques, including scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), confirming the successful grafting of PAN onto the GO surface. Batch adsorption tests showed that PAN@PRGO has an outstanding adsorption capacity for indigo carmine (IC) dye, achieving 490.0 mg g at pH 5.0 and 298 K. This is notably higher than the adsorption capacity of GO nanosheets alone (317.25 mg g) and exceeds that of other materials reported in the literature. Additionally, PAN@PRGO demonstrated 100% removal efficiency for IC dye at concentrations up to 300 mg L. The experimental data closely matched the Langmuir isotherm model and the pseudo-second-order kinetic model, suggesting that electron-sharing interactions between IC dye and PAN@PRGO contribute to the adsorption mechanism. The adsorbed IC dye was recoverable using a 0.1 M NaOH solution, with the composite retaining near-100% efficiency even after five adsorption-desorption cycles. These results indicate that the PAN@PRGO composite is a promising, reusable adsorbent for effective IC dye removal from industrial wastewater.
在本研究中，通过将聚苯胺（PAN）纳米颗粒附着在氧化石墨烯（GO）纳米片表面对其进行化学改性，制备了聚苯胺部分还原氧化石墨烯复合材料（PAN@PRGO）。这种合成的PAN@PRGO纳米复合材料是一种创新的高效吸附剂，用于从水中去除靛蓝胭脂红（IC）染料。使用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和X射线光电子能谱（XPS）等多种技术对PAN@PRGO的形态和化学成分进行了分析，证实了PAN成功接枝到GO表面。批量吸附试验表明，PAN@PRGO对靛蓝胭脂红（IC）染料具有出色的吸附能力，在pH 5.0和298 K条件下达到490.0 mg/g。这明显高于单独的GO纳米片的吸附容量（317.25 mg/g），并超过了文献中报道的其他材料。此外，PAN@PRGO对浓度高达300 mg/L的IC染料表现出100%的去除效率。实验数据与Langmuir等温线模型和准二级动力学模型密切匹配，表明IC染料与PAN@PRGO之间的电子共享相互作用有助于吸附机制。使用0.1 M NaOH溶液可回收吸附的IC染料，即使经过五次吸附 - 解吸循环，该复合材料仍保持近100%的效率。这些结果表明，PAN@PRGO复合材料是一种有前景的可重复使用的吸附剂，可有效去除工业废水中的IC染料。
