Khosro Mohammadi

In this study, the cellulose was extracted from Cystoseria myricaas algae. Nanocellulose, Fe3O4 and Fe3O4-nanocellulose are synthesized by acid hydrolysis, co-precipitation and sol-gel methods. The synthesized compounds were characterized by x-ray diffraction, transmission electron microscopy, particle size distribution (PSD), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy, vibrating sample magnetometer (VSM) and Fourier transform infrared spectroscopy (FTIR). The Hg (II) uptake on Fe3O4-nanocellulose investigated by 14 isotherm models and 12 kinetic models. Adsorption activation energy as well as thermodynamic of adsorption was calculated based on the measurement of the absorption at different temperatures. the interaction between the mercury ion and containing bio-polymers in algae are investigated by density functional theory (DFT) in various conditions. The results of the simulations were shown a good agreement with experimental data. In other work, the absorption of mercury ion and cadmium were investigated by Cystoseira myricaas and Colpomenia, respectively. Several isotherm and kinetic models were analyzed for experimental data by cystoseira myricaas as will as Colpomenia. Furthermore, the thermodynamic values (∆G °, ∆H° and ∆S°) were investigated in different algae sizes (75 μm, 200 μm and 1000 μm) for Cystoseira myricaas. The best conditions containing pH, temperature, sorbent dosage, metal concentration and contact time were found by response surface methodology (RSM) and Fuzzy modeling for Cystoseira myricaas and Colpomenia algae as adsorbents.