Fabrication of hydroxyapatite embedded cerium-organic frameworks for fluoride capture from water

• Published in: Journal of molecular liquids 2022-05, Vol.354, p.118830, Article 118830
• Main Authors: Jeyaseelan, Antonysamy, Aswin Kumar, Ilango, Naushad, Mu, Viswanathan, Natrayasamy
• Format: Article
• Language: English
• Subjects: Defluoridation; Field study; Hydroxyapatite; Metal organic frameworks; Regeneration
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2022.118830

[Display omitted] •HAp-Ce-BTC MOFs was prepared by a simple template-directed layer-by-layer (LBL) method for selective fluoride removal.•HAp-Ce-BTC MOFs removes fluoride via electrostatic attraction, complexation and ion-exchange mechanism.•HAp-Ce-BTC MOFs reusable upto six cycles using 0.1 M of NaOH as eluent.•HAp-Ce-BTC MOFs reduce fluoride concentration below the tolerance limit in field water sample. In this study, the hydroxyapatite (HAp) decorated Ce-BTC metal organic frameworks (MOFs) namely HAp-Ce-BTC MOFs was prepared using a simple template-directed layer-by-layer (LBL) method for the successful capture of fluoride from water. The developed HAp-Ce-BTC MOFs were evaluated through FTIR, XRD, SEM, elemental mapping, EDAX, TGA and DTA analysis. These results were exhibited that the successful fabrication of nanocomposites with altered morphologies. The adsorption ability of HAp-Ce-BTC MOFs on fluoride removal was explored with batch mode and HAp-Ce-BTC MOFs was identified to possess versatile adsorption property at broad range pH conditions and occurrence of the common ions present in water. On the whole, HAp-Ce-BTC MOFs on fluoride adsorption is spontaneous with endothermic in nature. The adsorption isotherm and kinetics studies were well fitted with Langmuir and pseudo-second-order model respectively. The major mechanism like electrostatic interaction and complexation involved in fluoride adsorption on HAp-Ce-BTC MOFs. The reusability and field studies of HAp-Ce-BTC MOFs indicate that they are regenerable and applicable at field environment.