Kinetic Study of Adsorption of Fluoride Ions Using Low-Cost Adsorbents

Suneet Kumar Sahni

doi:10.71097/IJSAT.v10.i2.10829

Kinetic Study of Adsorption of Fluoride Ions Using Low-Cost Adsorbents

Author(s)	Suneet Kumar Sahni
Country	India
Abstract	Fluoride toxicity in drinking water is a serious natural hazard and a major public health concern and has continued to pose a serious threat, particularly in developing economies that are deficient in safe and cost-efficient treatment processes. In the use of cheap and naturally abundant raw materials as adsorbents, adsorption emerges as a good and economical route for removal of fluoride. We performed a systematic kinetic and mechanism investigations for the adsorption of fluoride ions in the aqueous solution using a low-energy adsorbent produced from conventional and natural sources. Batch adsorption experiments were carried out under different operating conditions (contact time, initial fluoride concentration, pH, and adsorbent dosage) and the impact of different operating conditions on removal efficiency were analyzed. The adsorption kinetics were obtained in pseudo-first- and pseudo-second-order and rates controlling was observed through intraparticle diffusion analysis. Adsorption kinetics were pseudo first- and pseudo second-order depending on chemisorption, as the governing parameter. Moreover, adsorption isotherm studies confirmed the compatibility of fluoride ions with the surface of the adsorbent as reported earlier in Langmuir and Freundlich models. The pH effect indicated that the fluoride removal increased slightly in the acidic to neutral area and equilibrium condition of short contact phase showed that the adsorbents can be effectively used. Compared to materials previously described cost effective adsorbents have sufficient practical defluoridation capacity. Our analysis gives us important insights into the kinetics of adsorption as well as measures for achieving sustainable development of water treatment methods based on cost-effectiveness metrics. Such observations would be particularly relevant for rural and resource-limited settings in which rapid application of effective and simple fluoride removal methods is needed.
Keywords	Low-cost adsorbents, Pseudo-second-order model, Intraparticle diffusion, Water treatment, Environmental remediation
Published In	Volume 10, Issue 2, April-June 2019
Published On	2019-05-10
DOI	https://doi.org/10.71097/IJSAT.v10.i2.10829

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Kinetic Study of Adsorption of Fluoride Ions Using Low-Cost Adsorbents

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