EFFECTIVE AND FAST ADSORPTIVE REMOVAL OF COOMASSIE BRILLIANT BLUE G 250 DYE FROM WATER USING Fe₃O₄ MAGNETIC NANOPARTICLES

Coomassie Brilliant Blue G 250 (CBB G 250) is mainly generated from industrial textile effluent. Due to its non-degradable nature, it is not only environmentally hazardous, but also affect human health, causing irritations of the eye, respiratory or gastrointestinal tract. Therefore, a strategy for treating this colorant is necessary. This research highlights the synthesis of Fe3O4 Magnetic nanoparticles (Fe3O4 MNPs) as a low-cost adsorbent for removal of CBB G 250 dye from aqueous solutions. Fe3O4 MNPs were synthesized using chemical coprecipitation method. Characterization results revealed that the peaks at 537, 3400 and 1604 cm-1 in the Fourier Transform Infrared Spectroscopy spectrum represented the Fe-O band, O-H stretching and bending on the Fe3O4 MNPs surface, respectively. Crystal phase analysis indicated that Fe3O4 MNPs has a cubic spinel structure. Morphological analysis showed Fe3O4 MNPs are in nano-sized, spherical in shape, and have uniformly distributed particle size. The result from magnetic and surface area analyses demonstrated that Fe3O4 MNPs have 63.30 emu g-1 saturation magnetization and 123.5 m2 g-1 surface area. Thermal stability analysis showed that adsorbed water and hydroxyl group (6.25%) were lost at temperature below 100 ℃. At temperature between 260 ℃ and 540 ℃, approximately 2.09% weight loss were recorded due to change from magnetite (Fe3O4) to maghemite (Ɣ-Fe2O3) in crystal phase. Elemental analysis revealed that the Fe3O4 MNPs showed 24.50 % of Fe and 75.50 % of O. Following the confirmation of Fe3O4 MNPs structure, the impact of various parameters such as adsorbent dosage (0.02-0.14 g), contact time (5-20 minutes), initial concentration (25-100 ppm) and pH (3-10) on the adsorption of CBB G 250 dyes were investigated. Experimental results showed that Fe3O4 MNPs achieved 95% removal of CBB G 250 at optimum conditions of 0.12 g dosage, 15 minutes contact time, 50 ppm initial dye concentration and at pH value of 8. Adsorption isotherms and kinetics revealed that the adsorption process using Fe3O4 MNPs in this study obeys both Langmuir and Freundlich isotherm and pseudo-second-order kinetic. The results obtained from this study confirmed that Fe3O4 MNPs can be used as an adsorbent material for the removal of dye from effluent.