Research Article
N Kiran Kumar, D Sri Rami Redd
Abstract
The present study was designed to evaluate the interactive effects of pH, initial chromium ion concentration, biosorbent dosage and temperature of the aqueous solution on biosorption of chromium onto Syzigium cumini (java) seed powder. Based on four level Central Composite Design (CCD) involving pH from (2-6), initial chromium ion concentration from (10-30) mg/L, biosorbent dosage from (10-70) g/L and temperature of the aqueous solution from (293-313) K, a Response Surface Methodology (RSM) was standardized. The experiments designed by CCD were modeled using a polynomial equation as function of these parameters. Quadratic model proposed in the present study using CCD en suite is well suitable for analysis of experimental data. Further it was used to navigate the design space according to analysis of variance (ANOVA) results. The experimental values were on part with predicted values. Using the above methodology, we observed 90.50% removal of chromium from Syzigium cumini (java) seed powder at optimum conditions i.e. pH of 3.877, initial chromium ion concentration of 18.3201 mg/L biosorbent dosage of 36.3788 g/L and temperature of 302.3553 K STATISTICA 6.0 was used for implementing the CCD.