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- Title
Fluoride Removal from Aqueous Solutions by a Carbonaceous Material from Pyrolysis of Sewage Sludge.
- Authors
Márquez-Mendoza, S.; Jiménez-Reyes, M.; Solache-Ríos, M.; Gutiérrez-Segura, E.
- Abstract
Contact time, pH, fluoride concentration, and sorbent dose effects on the removal of fluoride ions by a carbonaceous material obtained from pyrolysis of sewage sludge (CM) were evaluated. Equilibrium was reached after 18 h of contact time and the maximum sorption was found at pH = 7.06 ± 0.08, which corresponds to the zero charge point of the CM. The highest efficiency in the sorption system for fluoride removal (2.84 ± 0.03 mg F $$ g_{{CM}}^{{ - 1}} $$) was found with 0.4 g L and with 20 g L, 82.2 ± 0.5% of fluoride was removed. The kinetic data of the process could be fitted to the pseudosecond order and the intraparticle mass transfer diffusion models, whereas isotherm to the Langmuir-Freundlich equation. These results indicate that the mechanism is chemisorption on a heterogeneous material. Fluoride ions were best partially desorbed using a bicarbonate ions solution and the material was partially regenerated by using a solution of HCl (pH = 1).
- Subjects
FLUORIDES; AQUEOUS solutions; PYROLYSIS; SEWAGE sludge; SORPTION
- Publication
Water, Air & Soil Pollution, 2012, Vol 223, Issue 5, p1959
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-011-0997-0