MODIFIKASI MODEL KOMPETITIF LANGMUIR UNTUK KESETIMBANGAN ADSORPSI Cd DAN Zn SISTEM BINER DENGAN BIOMASSA ASPERGILLUS NIGER

Abstract

Heavy metals released into the environment tend to persist indefinitely, and eventually accumulate at the food chain thus cause a serious threat to human. Cd and Zn are the main concern, because the technological applications of Cd and Zn are increasing. There is a need for controlling Cd and Zn emission into the environment. One of the possible process is biosorption. The aim of this work was to find the exact equilibrium model to predict the binary system adsorption by the Aspergillus niger biomass. The batch sorption experiments for binary component system were carried out using shaking bath. In the sorption isotherm test, 7 to 40 mg of biomass was mixed with 25 ml metal ion solution for 8 hours at 30 °c. Three different system were examined using Cd and Zn in the molar ratio of?. 1, and 2. The experimental results have been analysed using an Langmuir competitive model. An interaction factor was incorporated into the Langmuir competitive model and a significant improvement in correlation was obtained. The final model involved deriving an expression to correlate the interaction factor with surface loading. In this model, the average relative error was 0,0019 %.