Taguchi design tool has been employed to optimize the adsorption condition of fluoride on CCNB considering the simultaneous influence of all operational variables such as pH, concentration,adsorbent dose, contact time and temperature, each at four dif-ferent levels. The orthogonal array with L16(45) layout, followingthe ‘larger-is-better’ category quality characteristics of S/N ratiowas selected. This indicates that only 16 experiments are sufficientfor design of the experiment. The prominent operational variablesare found to be pH, concentration, adsorbent dose and temperature where pH has the highest contribution and time the least. The validity of the design and quality of predicted response was scruti-nized from ANOVA. The confirmation test at the desired confidenceinterval quite satisfies the design. Moreover, the experimental andpredicted response matches with each other. The isotherm analysiswas performed with Langmuir, Freundlich and Temkin model. Thequality of data fit with higher R2and lower SE suggests the applica-bility of Temkin isotherm. The fluoride interaction on CCNB may beassisted via release of hydroxyl ions. Desorption experiment withNaOH (0.01 M) showed that the CCNB can be used for three cycles,without compromising the adsorption capacity.
The present study deals with modeling of fluoride adsorptionusing cerium loaded cellulose nanocomposite bead (CCNB) characterized by Fourier transform infrared spectroscopy (FTIR), fieldemission scanning electron microscopy (FESEM), energy dispersivespectroscopy (EDS) and electron paramagnetic resonance (EPR)study. In an aim to improve the precision of operation simulta-neous optimization of process variables was made using statisticaldesign of experiment following Taguchi tool. Taguchi tool util-izes a standard orthogonal array comprising of each experimental variable with different levels. The signal-to-noise (S/N) ratio cor-responding to each combination is computed and is analyzed,based on ANOVA, to determine the optimal settings (experimental variable with its level) as well as the validity of the design.
The cooperative influence of operational variables for fluoride adsorption on cerium loaded cellulose nanocomposite bead (CCNB) was assessed using Taguchi design toolDr. Dhiman Santra, Ph.D.