Studies on fluoride adsorption by apatitic tricalcium phosphate (ATCP) from aqueous solution
- 13 February 2013
- journal article
- research article
- Published by Elsevier BV in Desalination and Water Treatment
- Vol. 51 (34-36), 6743-6754
- https://doi.org/10.1080/19443994.2013.769728
Abstract
The present study was conducted to evaluate the feasibility of apatitic tricalcium phosphate (ATCP) for fluoride adsorption from aqueous solutions. The adsorbent was characterized using X-ray diffraction and scanning electron microscope with energy dispersive X-ray analysis. Batch adsorption studies were performed as function of contact time, initial fluoride concentration, temperature, adsorbent dose, pH, and influence of competing anions. Fluoride adsorption kinetics was well fitted by pseudo-second-order model. The maximum sorption capacity of ATCP for fluoride removal was found to be 15.42 mg g−1 at 313 K. Thermodynamic parameters viz. ΔG°, ΔH°, and ΔS° were calculated indicating that the adsorption process was spontaneous and endothermic. The fluoride adsorption was well explained using Langmuir Freundlich, Temkin and Dubinin–Radushkevick models. Fluoride adsorption was influenced by the presence of HCO3− ions. It was observed that at pH = 12.75 around 88% desorption efficiency was found. Results from this study demonstrated potential utility of ATCP that could be developed into a viable technology for fluoride removal from aqueous solution.This publication has 32 references indexed in Scilit:
- A novel bentonite-based adsorbent for anionic pollutant removal from waterChemical Engineering Journal, 2012
- Removal of fluoride from aqueous solution by adsorption on Apatitic tricalcium phosphate using Box–Behnken design and desirability functionApplied Surface Science, 2012
- Defluoridation of water using Brushite: Equilibrium, kinetic and thermodynamic studiesDesalination, 2011
- Defluoridation of drinking water using chitosan based mesoporous aluminaMicroporous and Mesoporous Materials, 2011
- Fluoride removal from water by adsorption—A reviewChemical Engineering Journal, 2011
- Chitosan based mesoporous Ti–Al binary metal oxide supported beads for defluoridation of waterChemical Engineering Journal, 2010
- Study on the fluoride adsorption of various apatite materials in aqueous solutionJournal of Fluorine Chemistry, 2009
- Studies on sorption of some geomaterials for fluoride removal from aqueous solutionsJournal of Hazardous Materials, 2009
- Adsorption of fluoride in aqueous solutions using KMnO4-modified activated carbon derived from steam pyrolysis of rice strawJournal of Hazardous Materials, 2007
- Pseudo-second order model for sorption processesProcess Biochemistry, 1999