Optimization of Cr (VI) Removal Efficiency of Waste Tire Adsorbent from Aqueous Solution by Response Surface Methodology

Abstract

The aim of the present study is to optimize the adsorption parameters with the help of response surface methodology for increasing the Cr (VI) removal efficiency of Waste Tire Absorbent (WAT). The effect of four independent adsorption parameter such as Adsorbent dose (4–8g/l), Cr (VI) concentration (60–100 mg/l), duration (60–300 min), and temperature (30–50 oC), was investigated. Second-order polynomial regression model for fitting experimental data was suggested by ANOVA, and the coefficient of determination (R2 = 0.979) of the suggested model showed a good correlation between the predicted and experimental responses. The optimal conditions for removing Cr (VI) were found to be 5.4 g of adsorbed dose, 60.09 mg/l of Cr (VI) concentration, 30 °C temperature, and 140.15 minutes of adsorption time. The maximum removal efficiency of Cr (VI) using WTA was 62.22% at the optimum condition. The surface morphology, function group and element proportion of WTA were obtained using SEM, FTIR and XRF.