Removal of Direct Dye from Aqueous Solution by a Low-cost Hydrogel: Adsorption Kinetics, and Isotherms Study
Abstract
This study prepared, characterized, and applied a new surface of Sodium alginate (fumaric acid copolymer polyacrylic acid) hydrogel in removing direct yellow dye from its aqueous solution. Where several modern techniques were used to diagnose the properties of the prepared surface, including [fourier transform infrared spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM)] and one of the most important factors on which the adsorption process depends is pH. The best adsorption was found in the acidic medium, where the adsorption efficiency was (90.112 mg/g). The effect of weight was also studied, and the ideal weight used to obtain the best removal of the DY dye from its aqueous solution (0.05 g) was given, as it gave a removal percentage (93.21%). The adsorption of dye on the hydrogel increased from 140.23 to 155.44 mg/g with increasing temperature from 10 to 30°C, as it was found that the reaction was spontaneous. The equilibrium adsorption result was fitted to isotherm Freundlich and isotherm Langmuir. The best adsorption efficiency from the isotherm Freundlich was estimated to be 155.4 mg/g for the physic-sorption of DY dye on hydrogel. The adsorption was best described via the kinetic second model (R2 = 0.868). The results indicate that hydrogel is a very effective absorbent material in the treatment of pollutants.Keywords:
Direct Dye, Hydrogel, Isotherm, Kinetic, Removal, ThermodynamicReferences
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