Optimization and Modeling of Process Variables for Adsorption of Basic Blue 41 on Naoh-Modified Rice Husk Using Response Surface Methodology Publisher



Ashrafi SD^{1, 2} ; Kamani H³ ; Soheil Arezomand H² ; Yousefi N² ; Mahvi AH^{2, 4, 5}
Source: Desalination and Water Treatment Published:2016

Abstract

The aim of this study was to optimize the conditions of the Basic Blue 41 (BB41) adsorption on NaOH-modified rice husk (NaOH–RH) using response surface methodology based on Box–Behnken design. The three-level factors considered were pH (4, 7, and 10), initial concentration of BB41 (50, 75, and 100 mg L−1), and adsorbent dose (0.025, 0.0875, and 0.15 g L−1). Statistical analysis of result has shown that the predicted values for BB41 adsorption were close to the experimental values and were in a good agreement, on the other hand, the F-value (40.48), p-value (0.0004), and R2 (0.9865) indicated that the regression is able to give a good prediction of response for the adsorption process in the range studied. According to the results, when the response was set in maximize and all the three factors were set in a range, the optimized values for BB41 adsorption were predicted as follows: pH value of 8.47, and BB41 initial concentration of 67.9 mg L−1 and adsorbent dose of 0.12 g L−1 for removal efficiency of 97.65%. © 2015 Balaban Desalination Publications. All rights reserved.