Department of Physics and Astronomy, College of Science, King Saud University, P. O. Box 2455, Riyadh, 11451, Saudi Arabia.
Department of Physics and Astronomy, College of Science, King Saud University, P. O. Box 2455, Riyadh, 11451, Saudi Arabia.
Environ Res. 2023 Dec 15;239(Pt 2):117387. doi: 10.1016/j.envres.2023.117387. Epub 2023 Oct 12.
In recent years, g-CN-Ag nanocomposite synthesis has gained considerable attention for its potential to treat polycyclic aromatic hydrocarbons (PAHs) and to act against bacteria and fungi. In this study, we present a novel approach to the synthesis of g-CN-Ag nanocomposite and evaluate its efficiency in both PAH removal and antimicrobial activity. The synthesis process involved the preparation of g-CN by thermal polycondensation of melamine. The factors that affect the adsorption process of PAHs, like time, pH, irradiation type, and adsorbent dosage, were also evaluated. Isotherm models like Langmuir and Freundlich determined the adsorption capability of g-CN-Ag. In simulated models, phenanthrene was degraded to a maximum of 85% at lower concentrations of catalyst. The adsorption profile of phenanthrene obeys the pseudo-second-order and Freundlich isotherms pattern. The g-CN-Ag nanocomposite also exhibited antimicrobial activity against bacteria (Escherichia coli, Bacillus subtilis, Staphylococcus aureus, Klebsiella pneumoniae) and fungi (Candida albicans). The present study is the first report stating the dual application of g-CN-Ag nanocomposite in reducing the concentration of PAH and killing bacterial and fungal pathogens. The higher adsorption capability proclaimed by g-CN-Ag nanocomposite shows the fabricated nanomaterial with great potential to remediate organic pollutants from the ecosystem.
近年来，g-CN-Ag 纳米复合材料的合成因其能够处理多环芳烃 (PAHs) 以及对抗细菌和真菌的能力而受到广泛关注。在本研究中，我们提出了一种合成 g-CN-Ag 纳米复合材料的新方法，并评估了其在 PAH 去除和抗菌活性方面的效率。该合成过程涉及通过三聚氰胺的热缩聚制备 g-CN。还评估了影响 PAHs 吸附过程的因素，如时间、pH 值、辐射类型和吸附剂剂量。吸附等温线模型如 Langmuir 和 Freundlich 确定了 g-CN-Ag 的吸附能力。在模拟模型中，在较低浓度的催化剂下，菲的降解率最高可达 85%。菲的吸附轮廓遵循伪二级和 Freundlich 等温线模式。g-CN-Ag 纳米复合材料还对细菌（大肠杆菌、枯草芽孢杆菌、金黄色葡萄球菌、肺炎克雷伯菌）和真菌（白色念珠菌）表现出抗菌活性。本研究首次报道了 g-CN-Ag 纳米复合材料在降低 PAH 浓度和杀死细菌和真菌病原体方面的双重应用。g-CN-Ag 纳米复合材料表现出的更高吸附能力表明，所制备的纳米材料具有从生态系统中修复有机污染物的巨大潜力。
