Abstract
Hematite/graphene oxide (FGO) nanocomposites were used as a supporting surface for the fungus Aspergillus terreus AUMC-050 to form AFGO biofilm. Different techniques were used for characterization of nanocomposites and biofilm such as IR, Fourier transform infrared, Scanning electron microscopy, Transmittance Electron Microscopic, Brunauer-Emmett-Teller surface area, and Raman Spectroscopy. The effect of initial dye concentration (0-300mg/L), contact time (0-80min), pH values (2.0-8.0), and temperature (10-50 degrees C) was studied. The maximum adsorption capacity of dye using AFGO biofilm was 160mg dye/g at pH 2.0, and the contact time was 50min. The best fitted equilibrium and kinetic model were found to be Langmuir and pseudo-first order, respectively. Various thermodynamic parameters were evaluated to determine the nature of biosorption process. The negative value of G and H degrees indicated spontaneity and exothermic behavior of the adsorption process. Using of microbial biofilm supported on nanocomposite material is a new approach for adsorption of dyes from water body.