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IRON NANOPARTICLES SUPPORTED ON MICROFIBRILLATED CELLULOSE FOR THE REMOVAL OF As(V) FROM AQUEOUS SOLUTION
Arsenic pollution of aquatic systems has drawn attention of scientific community all over the world. It was reported that Arsenic (As) in water poses health hazards to humans due to its toxic, mutagenic and carcinogenic effects. The contamination of As has been reported in some areas of Mexico and it has been atributted to geochemical factors. As concentration on these sites ranged from 0.014 to 3.812 mg/L, which are above the maximum permissible level set by the WHO for drinking water. Adsorption is an easy and selective process. The use of hybrid adsorbents is of great importance in the development of new sustainable technologies. In the present work the feasibility of simultaneous adsorption of inorganic As by using the branch wood of plant (Moringa oleifera Lam.) was studied. A large amount of wood has been obtained during the branch pruning process, so it is a easily available biomass. The microfibrillated cellulose (NCRI) was extracted by Kraft Pulping of Moringa oleífera Lam. wood and also by an acid hydrolysis method. The separation of microfibers was carried out using high-intensity ultrasonication technique combined with cryocrushing. The iron nanoparticles were formed using tea leaf extract of moringa (NCRI-M), adjusted to pH 7. The characterization of NCRI-M was carried out by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), the specific surface area (BET), Fourier transform infrared spectroscopy (FTIR) and Energy Dispersive X-Ray Fluorescence (EDXRF). Batch-type experiments were performed to determine As removal kinetic and equilibrium parameters of the system. For these experiments, 5 mL aliquots of a 2 mg/L (Na2HAsO4.7H2O) solution were used, and they were put in contact with 0.0100 g of NCRI-M in order to determine the adsorption capacity. Results showed that As(V) removal by NCRI-M was higher than NCRI, indicating that Fe nanopartcile modification enhances As(V) sorption on micrifibrilated cellulose.