Application of taguchi L₁₆ orthogonal array design to optimize hydrazine biosorption by Sargassum ilicifolium

Abstract

In this work, Taguchi L 16 experimental design was applied to optimize biosorption of hydrazine by Sargassum ilicifolium in a batch system. Biosorption tests were performed with four factors concentration, pH, biosorbent dosage, and agitation time at four different levels. Optimal experimental conditions were determined by calculated signal-to-noise ratios. The best conditions for biosorption of hydrazine were determined by the Taguchi method and desirability approach as initial hydrazine concentration of 135 mg/L, pH 5 7.5, biosorbent dose of 0.1 g/L and time 90 min. Furthermore, thermodynamic, isotherm and kinetic studies were performed to explain the biosorption mechanism. The kinetic of hydrazine removal followed the pseudo-second-order model. A nonlinear regression was applied to fit the experimental data with several isotherm models. The Redlich-Peterson and RadkePrausnitz isotherms showed the best concordance as equilibrium models. Nature of possible interactions between the functional groups of S. ilicifolium and hydrazine was confirmed by FTIR spectra of raw and hydrazin-loaded alga.

Taguchi Optimization Studies for Abatement of 2‐Chlorophenol Using Neem Seed Activated Carbon

“…The endothermic nature of the diffusion process improves the mobility of the 2CP ions, resulting in increased adsorption. However, diffusion alone cannot significantly affect the increased adsorption, but the existence of chemisorption can explain the trend very well [18,24]. The presence of chemisorption is evident because the experimental data were in good agreement with the Redlich-Peterson isotherm model.…”

“…The enhanced adsorption capacity with the increase in initial concentration can be due to two reasons. The first is the availability of a surplus amount of sorption sites on NAC, resulting in an enhanced uptake capacity [24]. The second is the multilayer adsorption (physisorption) process at higher initial concentrations.…”