Hemijska industrija 2011 Volume 65, Issue 1, Pages: 23-35
https://doi.org/10.2298/HEMIND100712052A
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Fluoride sorption using Cynodon dactylon based activated carbon
Alagumuthu G.
Veeraputhiran V.
Venkataraman R.
This study deals the application of Cynodon dactylon based thermally
activated carbon for fluoride toxicity. The batch adsorption techniques was
followed at neutral pH as the functions of contact time, adsorbent dose,
adsorbate concentration, temperature and the effect of co-anions. The data
indicate that the prepared adsorbent surface sites are heterogeneous in
nature and that fits into a heterogeneous site-binding model. The present
system followed the Redlich-Peterson isotherm as well as Langmuir adsorption
isotherm model. Lagergren pseudo-first-order, pseudo-second-order, intra
particle diffusion and Elovich kinetics were modeled to describe the
adsorption rate of fluoride and determined as this scheme followed
pseudo-second-order kinetics. The calculated enthalpy change, ΔH°, and
entropy change, ΔS°, for the adsorption process are +8.725 kJ/mol and +0.033
J/mol K respectively and shows endothermic experience. Instrumental analysis
of XRD, FTIR and SEM gives the idea about the fluoride binding ability of
adsorbent.
Keywords: Fluoride, Cynodon dactylon, adsorption, isotherms, kinetic models
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