Abstract
A novel cerium-loaded cellulose nanocomposite bead (CCNB) is synthesized and tested for fluoride adsorption. The optimization of the process under the cooperative influence of different experimental variables was made employing response surface methodology (RSM). It is found from fractional factorial design (FFD) that among the different experimental variables, only adsorbent dose, temperature, and pH are significant. At the optimum condition (adsorbent dose 1 g L−1, temperature 313 K, pH 3.0), a maximum fluoride adsorption of 94 % was observed for an initial fluoride concentration of 2.5 mg L−1. A quadratic polynomial model equation based on central composite design (CCD) was built to predict the extent of adsorption. The result of the analysis of variance (ANOVA) shows high coefficients of determination (correlation coefficient; R 2 = 0.9772, adjusted R 2 = 0.9545, and adequate precision = 18.1045) and low probability value (Prob > F, 0.001) which signifies the validity of the model. The equilibrium adsorption data conformed to the Tempkin isotherm, having higher R 2 and lower SE value, among the Langmuir, Freundlich, and Tempkin equations at different temperatures. The adsorption data was found to fit well the second-order rate equation with film diffusion governing the overall rate. The activation energy value was calculated to be 16.74 kJ mol−1. Fluoride can be eluted from fluoride-loaded CCNB using alkali. CCNB can be reused at least for five successive operations.
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Acknowledgments
One of the authors (D.S) is grateful to the University of Kalyani for providing research fellowship. The assistances and the instrumental facilities available under UGC-SAP, DST-FIST, and DST-PURSE programs are duly acknowledged. Thanks are due to IACS and SNBNCBS, Kolkata, for SEM and EDS analysis.
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Sarkar, M., Santra, D. Modeling Fluoride Adsorption on Cerium-Loaded Cellulose Bead—Response Surface Methodology, Equilibrium, and Kinetic Studies. Water Air Soil Pollut 226, 30 (2015). https://doi.org/10.1007/s11270-015-2307-8
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DOI: https://doi.org/10.1007/s11270-015-2307-8