Optimization and Response Surface Modeling of Chromium Removal from Aqueous Solution using Nano Zero Valent Iron (NZVI)

The ability use of NZVI for the removal of Heavy Metal such as Chromium from aqueous solution has been investigated in batch mode examinations. Amount removal of Chromium is found to be 98.87% at pH:4, amount of adsorbent dosage of 0.01 g in 20 minutes and 5 ppm Chromium solution. Influences of parameters like initial Chromium concentration (5-15 mg/L), time (20-150), and NZVI dosage (0.005-0.02 g) on Chromium adsorption were examinated using response surface methodology. The Box-Behnken experimental design in response surface methodology was used for designing the experiments were run as well as for full response surface estimation and 15 trials as per the model. The optimum conditions for maximum removal of Chromium from an aqueous solution of 10 mg/L were as follows: adsorbent dosage (0.005 g), and 20 minutes initial Chromium concentration (5 ppm) in pH: 4. The high correlation coefficient (R2:0.971) between the model and the experimental data showed that the Box-Behnken experimental design was able to predict the removal of Chromium using NZVI from aqueous solution effectually.