Statistical analysis for remediation of As(III) ions from water using pristine and derivatized Phyllanthus emblica seed coat

Abstract

The aim of this study is to determine the optimal conditions for remediation of As(III) ions from water using pristine Phyllanthus emblica (PPE) seed coat and derivatized Phyllanthus emblica (DPE) seed coat, by using Box-Behnken design (BBD) and central composite design (CCD) optimization techniques. pH, initial ion concentration, dosage, and contact time were taken as process parameters while designing the experiment. The desirability factor is 1.0 for the BBD and 0.8 for CCD for both adsorbents. The regression coefficient for both adsorbents was in the range of 0.993-0.999 for the BBD and 0.965-0.969 for the CCD. The BBD is found to be more suitable for optimization of variables for maximum removal, and estimation of removal percentage in different conditions. The adsorption of ions at equilibrium (qe) is found to be 43.59 mg/g at pH 7.13, initial concentration of arsenic of 99.02 mg/L, contact time of 105.13 min, and dosage of 0.12 g/L for PPE using the BBD. However, the adsorption of ions at equilibrium (qe) is found to be 48.79 mg/g at pH 7.31, initial ion concentration of 98.82 mg/L, contact time of 126.99 min, and dosage of 0.12 g/L for DPE using the BBD.