Abstract

Marwa Sabbar Falih, Suhair Abdulhadi Mahdi, Mudeer Mubarak Merza

This paper concludes the utilization of coal and ficus for removing chromium (VI) from aqueous solution. For this purpose, coal was without further purification processes. On the other hand, ficus modified was prepared after cleaning, drying, grinding. Results were analyzed and parameters were calculated for the pH, biosorbent doses, initial Cr (VI) concentration, and contact time by batch systems. The optimum removal of chromium was found at pH equal to 2 and 3 using coal and ficus modified, respectively with the removal efficiency of chromium from aqueous solutions 98.2% and 91.5%, respectively. The efficiencies were calculated using 0.2 g and 0.4 g and initial chromium concentration 20 mg L-1 and 25 mg.L-1 under a contact times of 30 min and 60 min using coal and ficus modified, respectively. FTIR spectra were conducted for adsorbent before and after chromium (VI) removal to discover the number of active sites and the functional groups on the adsorbent. The results of FTIR spectra were conducted for adsorbent before and after chromium (VI) removal to discover the number of active sites and the functional groups on the adsorbent. The results indicated the adsorption isotherm and kinetics are more compatible with Freundlich isotherm and pseudo-second-order consecutive.