Fluoride sorption using Cynodon dactylon-based activated carbon
2011
Alagumuthu, G., Sri Paramakalyani College, Tamilnadu (India). Chemistry Research Centre | Veeraputhiran, V., Sri Paramakalyani College, Tamilnadu (India). Chemistry Research Centre | Venkataraman, R., Sri Paramakalyani College, Tamilnadu (India). Chemistry Research Centre
This study deals with the application of Cynodon dactylon-based thermally activated carbon for fluoride toxicity. The batch adsorption technique was followed at neutral pH as a function 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 the 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, deltaH degree, and entropy change, deltaS degree, for the adsorption process were 8.725 kJ/mol and 0.033 J/mol K, respectively, and showed endothermic experience. Instrumental analysis of XRD, FTIR and SEM gives an idea about the fluoride binding ability of adsorbent.
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