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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 12, No. 1, 2015, pp. 223-236
Bioline Code: st15020
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 12, No. 1, 2015, pp. 223-236

 en Fluoride removal study using pyrolyzed Delonix regia check for this species in other resources pod, an unconventional adsorbent
Ajisha, M. Angelina Thanga & Rajagopal, K.

Abstract

Applicability of the new material pyrolyzed Delonix regia check for this species in other resources pod carbon for the removal of excess fluoride ions from the water that harm the human and the environment was studied. The adsorbent was characterized both physically and chemically. Surface chemistry characterization was done with pH-drift method. Batch adsorption studies were carried out for the effect of pH, dosage, contact time, initial fluoride concentration, temperature and interfering co-ions. The physicochemical properties and textural characters were analyzed. Equilibrium data were studied using Freundlich, Langmuir, Temkin and Dubinin–Radushkevich models, in which Freundlich isotherm was considered to be the best fit for the adsorbent. The sorption nature was studied using thermodynamic parameters which showed spontaneous, irreversible, stable and endothermic. The adsorption kinetics follows pseudo-second order. The mechanism of adsorption was determined from intraparticle diffusion model. Boyd plot showed that the adsorption of fluoride on the carbon was mainly governed by particle diffusion.

Keywords
Batch; Defluoridation; Delonix regia; Isotherm; Thermodynamics; Kinetics; Mechanism

 
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