In Situ Fabrication of Magnetic Iron Oxide over Nano-hydroxyapatite Gelatin Eco-polymeric Composite for Defluoridation Studies

详细信息    查看全文

• 作者：Kalimuthu Pandi ; Natrayasamy Viswanathan
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：January 14, 2016
• 年：2016
• 卷：61
• 期：1
• 页码：571-578
• 全文大小：497K
• ISSN：1520-5134

文摘

This research work deals with the defluoridation studies of magnetic iron oxide (Fe₃O₄) fabricated nano-hydroxyapatite (n-HAp) gelatin (Gel) eco-polymeric composite. The developed hybrid Fe₃O₄@n-HApGel composite displays a high defluoridation capacity (DC) of 5009 mgF^–·kg^–1. Batch sorption experiments were performed to find the effect of various influencing parameters such as pH, contact time, competitor co-anions, initial fluoride concentration, and temperature. The structural, surface morphological changes, and elements present in the sorbent were studied using FTIR, XRD, and SEM with EDAX techniques. The equilibrium isotherm study was fitted with Langmuir isotherm model. The thermodynamic parameter values indicate the spontaneous and endothermic nature of fluoride sorption. The proposed mechanism indicates that the enhanced DC of magnetic composite is mainly due to electrostatic adsorption and complexation between fluoride ion and composite in addition to ion-exchange. The regeneration and reusability studies were performed for the effective utilization of the magnetic composite. The performance of Fe₃O₄@n-HApGel nanocomposite at field conditions was checked with the water sample collected from a nearby fluoride prevalent area.