TITLE:
Application of Response Surface Methodology for Optimization of Fluoride Removal Mechanism by Newely Developed Biomaterial
AUTHORS:
Ria Bhaumik, Naba Kumar Mondal, Soumya Chattoraj, Jayanta Kumar Datta
KEYWORDS:
Lemon Leaf; Fluoride; Adsorption; Langmuir Isotherm; Pseudo-Second-Order Kinetic Model; Thermodynamic Study; Response Surface Methodology
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.4 No.8,
August
9,
2013
ABSTRACT:
The adsorption capacities of new biomaterials derived
from lemon leaf (Citrus sp.) toward
fluoride ions have been explored by varying different physicochemical
parameters such as pH, initial concentration, adsorbent dose, contact time,
stirring rate and temperature. The entire study was done through batch process.
Maximum fluoride adsorption of 96.9% - 98.8% was achieved with an initial concentration
of 10 mg/L. Langmuir isotherm model well expressed fluoride ad- sorption
onto LLD-1, LLD-2 and LLD-3. According to correlation coefficient, the fluoride
adsorption onto these 3 ad- sorbents was correlated well with
pseudo-second-order kinetic model. From thermodynamic study, the spontaneous
nature and feasibility of the adsorption process with negative enthalpy (ΔH0)
value also supported the exothermic nature were shown. The rate
of fluoride adsorption was mathematically described as a function of
experimental parameters and was modeled through Box-Behnken (Response surface
methodology). The results showed that the responses of fluoride adsorption
were significantly affected by the quadratic term of pH, initial concentration,
contact time and temperature and the statistical analysis was performed by
ANOVA which indicated good correlation of experimental parameters.