USED OF JABUTICABA (Plinia sp.) PEEL AS AN ADSORBENT TO REMOVAL OF CHROMIUN (VI) FROM AQUEOUS SOLUTION: DESIGN FACTORIAL, KINETIC AND EQUILIBRIUM STUDY

Abstract

The objective of this study was to evaluate the ability of removing ions Chromium (VI) an aqueous synthetic through the adsorption process using Jabuticaba (Plinia sp.) peel. This experiment was performed a 23 factorial experiment with triplicate central point in order to determine the best conditions of the adsorption process. The input variables used to evaluate were: amount of adsorbent (0.1 – 0.5 g) initial pH (5.0 – 6.0) and time of the experiment (5 – 10 minutes). The dependent variable used is the efficient removal of ions (%). The highest efficiency in this study was observed with higher pH and lower sorbent and the experimental period with a value of 54%. Kinetic studies evidenced the maximum adsorption, which was obtained from 5 to 10 minutes, reached its maximum capacity saturation, with two phases, an initial phase (fast) contributes significantly to the uptake equilibrium phase and a slower negligible. In the balance studies, the Langmuir model was the best fit to experimental data jabuticaba biomass, being the maximum amount of adsorption of 174.16 mg g-1.