USE OF CAROTENOID EXTRACTED TOMATO RESIDUE FOR REMOVAL OF Cu (II) IONS FROM AQUEOUS SOLUTION
TSVETKO V. PROKOPOV 1*, MILENA I. NIKOLOVA 1, DONKA S. TANEVA 1, NADEZHDA T. PETKOVA 2 1. University of Food Technologies, Department of Environmental Engineering, 26 Maritsa Blvd., 4000 Plovdiv, Bulgaria
2. University of Food Technologies, Department of Organic and Inorganic Chemistry, 26 Maritsa Blvd., 4000 Plovdiv, Bulgaria
The purpose of this paper is to tested carotenoid extracted tomato residue as a cheap biosorbent for its ability to remove Cu (II) ions from aqueous solution. Batch experiments were carried out to evaluate the effects of pH, agitation speed, biosorbent dosage, initial metal concentration and contact time. The maximum removal efficiency of 89.7 ± 0.14 % was reached at pH 6.0 by using of adsorbent dosage 4 g·L-1, initial metal concentration 40 mg·L-1, temperature 25 °C, agitation speed 200 rpm and contact time 60 min. Pseudo-first order and pseudo-second order models were applied to describe the obtained kinetic data. The pseudo-second order model provided the best fit for experimental data with coefficient of determination R2 = 0.999. Freundlich and Langmuir isotherm models were used to describe metal adsorption. Equilibrium data agreed well with Langmuir isotherm with R2 = 0.970.
