Salgado Pablo, Aedo Eduardo, Vidal Gladys
Departamento de Ingeniería Civil, Facultad de Ingeniería, Universidad Católica de la Santísima Concepción, Concepción 4090541, Chile.
Grupo de Ingeniería y Biotecnología Ambiental (GIBA-UDEC), Facultad de Ciencias Ambientales, Universidad de Concepción, Concepción 4070386, Chile.
Nanomaterials (Basel). 2024 Nov 16;14(22):1832. doi: 10.3390/nano14221832.
The present study reports the synthesis of FeO nanoparticles on sawdust (FeO@PS) using a leaf extract. The morphology and structure of FeO@PS were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and UV-Vis diffuse reflectance. The adsorption capacity of the system was evaluated by testing its ability to remove the Rhodamine B (RhB) dye. The optimization of the system was carried out using the Plackett-Burman design (PBD) and the response surface methodology (steepest ascent and the Box-Behnken design), which provided information on the main parameters affecting the adsorption process. The PBD results showed that the most important parameters for the removal of RhB using FeO@PS were the removal time, the RhB concentration, and the initial pH of the system. The reusability of FeO@PS under optimal conditions was tested and it was found to maintain its efficiency after five cycles of use. The efficiency and rate of RhB removal observed at pH values near 7.0 were found to be predominantly influenced by electrostatic interactions. In contrast, the analyses conducted at pH values near 8.3 exhibited reduced influence from electrostatic attractions, with π-π interactions and hydrogen bonds emerging as dominant forces. At pH values exceeding 8.3, all potential interactions between RhB and FeO@PS exhibited diminished strength. This research provides valuable information on the formation of eco-friendly nanoparticles immobilized on a forest residue such as sawdust, which can effectively remove organic pollutants like RhB. This contributes to the valorization of resources and the search for solutions to water pollution.
本研究报道了利用树叶提取物在锯末上合成纳米FeO（FeO@PS）。采用扫描电子显微镜（SEM）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和紫外-可见漫反射对FeO@PS的形态和结构进行了表征。通过测试该体系去除罗丹明B（RhB）染料的能力来评估其吸附容量。利用Plackett-Burman设计（PBD）和响应面方法（最速上升法和Box-Behnken设计）对该体系进行了优化，得到了影响吸附过程的主要参数信息。PBD结果表明，使用FeO@PS去除RhB的最重要参数是去除时间、RhB浓度和体系初始pH值。测试了FeO@PS在最佳条件下的可重复使用性，发现其在使用五个循环后仍能保持效率。发现在pH值接近7.0时观察到的RhB去除效率和速率主要受静电相互作用的影响。相比之下，在pH值接近8.3时进行的分析显示静电吸引的影响减弱，π-π相互作用和氢键成为主导作用力。在pH值超过8.3时，RhB与FeO@PS之间的所有潜在相互作用强度均减弱。本研究为固定在锯末等森林残留物上的环保型纳米颗粒的形成提供了有价值的信息，这些纳米颗粒可以有效去除RhB等有机污染物。这有助于资源的增值和水污染解决方案的探索。
