State University of Maringá, Department of Biotechnology, Genetics and Cell Biology, Maringá, Paraná, Brazil; Linking Landscape, Environment, Agriculture and Food, School of Agriculture - University of Lisbon, Lisbon, Portugal.
State University of Maringá, Department of Chemical Engineering, Maringá, 87020-900, Paraná, Brazil.
Chemosphere. 2024 Jan;346:140520. doi: 10.1016/j.chemosphere.2023.140520. Epub 2023 Oct 28.
This paper explores the feasibility of functionalizing mango stones with iron oxide magnetic nanoparticles (MS-FeO) by coprecipitation in batch adsorption processes. The synthesized material was characterized and applied in chloroquine (CQN) and sertraline hydrochloride (SER) removal from contaminated waters. The biosorbent was subjected to a regenerative study and treatment using a synthetic mixture of contaminants to evaluate its applicability in real effluents. The biosorbent was analyzed by transmission electron microscopy images, scanning electron microscopy, dispersive X-ray spectroscopy, Fourier transform infrared spectra, and zeta potential to characterize its chemical and morphology properties. The techniques applied showed the effectiveness of the proposed modification. In the adsorption experiments, the optimal adsorbent dosage was 0.01 g for both contaminants. The pH strongly influenced the adsorption of the drugs on MS-FeO, and the best results were obtained in the pH range of 5-6. Kinetic data showed a better fit to the pseudo-second-order model, and the equilibrium time was achieved in 16 h for CQN and 4 h for SER. Isotherm studies revealed maximum adsorptive capacities of 49.42 and 64.79 mg g, respectively, for CQN and SER, at 318 K, demonstrating that the increase in temperature is a favorable factor, and the Sips model better describes the process. The thermodynamic parameters indicate an endothermic (ΔH° >0), spontaneous (ΔG° <0), and reversible (ΔS° >0) nature of the adsorption. This process is essentially governed by physical forces, such as hydrogen and π-π bonds. However, it is also valid to consider the presence of electrostatic forces due to the ionizing nature of CQN and SER. The MS-FeO biosorbent showed good performance when evaluated in a synthetic mixture of four contaminants, with an overall removal efficiency of approximately 86% and the regenerative capacity of three reusing cycles.
本文探讨了通过共沉淀法在批处理吸附过程中对芒果核进行氧化铁磁性纳米粒子（MS-FeO）功能化的可行性。合成材料进行了表征，并应用于从受污染水中去除氯喹（CQN）和盐酸舍曲林（SER）。对生物吸附剂进行了再生研究和处理，使用污染物的合成混合物评估其在实际废水中的适用性。通过透射电子显微镜图像、扫描电子显微镜、分散 X 射线能谱、傅里叶变换红外光谱和zeta 电位对生物吸附剂进行了分析，以表征其化学和形态特性。所应用的技术表明了所提出的改性的有效性。在吸附实验中，对于两种污染物，最佳吸附剂用量均为 0.01 g。pH 值强烈影响药物在 MS-FeO 上的吸附，在 pH 值为 5-6 的范围内得到了最佳结果。动力学数据表明更符合伪二级模型，CQN 的平衡时间为 16 h，SER 为 4 h。等温线研究表明，在 318 K 时，CQN 和 SER 的最大吸附容量分别为 49.42 和 64.79 mg/g，表明升高温度是有利的因素，Sips 模型更好地描述了该过程。热力学参数表明吸附是吸热的（ΔH°>0）、自发的（ΔG°<0）和可逆的（ΔS°>0）。这个过程主要受物理力（如氢键和π-π键）的控制。然而，由于 CQN 和 SER 的电离性质，也可以考虑静电作用力的存在。在评估含有四种污染物的合成混合物时，MS-FeO 生物吸附剂表现出良好的性能，总体去除效率约为 86%，具有三个重复使用周期的再生能力。
