Department of Chemistry, Anna University, University College of Engineering, Dindigul, Reddiyarchatram, Dindigul 624 622, Tamilnadu, India.
Department of Chemistry, Anna University, University College of Engineering, Dindigul, Reddiyarchatram, Dindigul 624 622, Tamilnadu, India.
Colloids Surf B Biointerfaces. 2023 Apr;224:113190. doi: 10.1016/j.colsurfb.2023.113190. Epub 2023 Feb 1.
The excess fluoride in drinking water is serious risk which leads to fluorosis. The adsorption method is facile route for defluoridation studies. Hybrid adsorbent possesses unique advantages like high surface area and high stability has been employed for water treatment. In the present work, hydrotalcite (HT) fabricated Ce-metal organic frameworks (MOFs) bridged with biopolymers (alginate and chitosan) namely HT-CeMOFs@Alg-CS cubic hybrid beads was developed and employed towards fluoride removal in batch mode. The fabricated HT-CeMOFs@Alg-CS beads were analyzed by DTA, FTIR, SEM, EDAX, TGA and XRD studies. Besides, FTIR and EDAX proved the affinity of HT-CeMOFs@Alg-CS cubic hybrid beads on fluoride was majorly attributed by electrostatic interaction, ion-exchange and complexation mechanism. To include detail insight into adsorption route; the kinetics, thermodynamic and isotherm studies were investigated for fluoride adsorption. The equilibrium data of HT-CeMOFs@Alg-CS cubic hybrid beads for fluoride adsorption was fitted with Langmuir isotherm model. Thermodynamic investigation results demonstrated that the fluoride adsorption was spontaneous with endothermic nature. The regeneration and field investigation results revealed that the developed HT-CeMOFs@Alg-CS cubic hybrid beads are reusable and more apt at field environment.
饮用水中过量的氟是导致氟中毒的严重风险。吸附法是除氟研究的简便途径。杂化吸附剂具有高比表面积和高稳定性等独特优势，已被用于水处理。在本工作中，制备了水滑石（HT）负载 Ce 金属有机框架（MOFs）桥联生物聚合物（海藻酸钠和壳聚糖）的 HT-CeMOFs@Alg-CS 立方杂化珠，并用于批处理模式下的除氟研究。通过 DTA、FTIR、SEM、EDAX、TGA 和 XRD 研究对制备的 HT-CeMOFs@Alg-CS 珠进行了分析。此外，FTIR 和 EDAX 证明 HT-CeMOFs@Alg-CS 立方杂化珠对氟的亲和力主要归因于静电相互作用、离子交换和络合机制。为了更深入地了解吸附途径，研究了动力学、热力学和等温线研究来研究氟化物的吸附。HT-CeMOFs@Alg-CS 立方杂化珠对氟化物吸附的平衡数据符合 Langmuir 等温线模型。热力学研究结果表明，氟化物吸附是自发的、吸热的。再生和现场调查结果表明，所开发的 HT-CeMOFs@Alg-CS 立方杂化珠可重复使用，更适合现场环境。
