In this study, organic bentonite and magnetic organo-bentonite were fabricated by cetyl trimethylammonium bromide surfactant and nickel ferrite magnetic nanoparticles and used to remove the reactive blue 19 dye. The characterization were investigated using XRD, BET, EDX, SEM, FTIR and zeta-potential methods.with the accumulation of surfactant molecules and nickel ferrite nanoparticles, their specific surface area decrease but changes as it causes electrostatic adsorption of the reactive blue 19 dye. FTIR and EDX tests examined the presence of surfactant and nickel ferrite nanoparticles in the sample. to eva‎luate the performance of these two adsorbents, adsorption tests were performed in batch system to remove the blue reactive dye 19. Natural bentonite could not remove the dye, but by modifying its surface by surfactant, it was able to remove about 85% of the dye at a concentration of 160 mg / l, and the magnetic organo-bentonite adsorbent was able to remove about 67% of the dye under the same conditions. The adsorption kinetics were in good agreement with the semi second order kinetic model for both adsorbents. The effect of other parameters such as pH changes, the presence of salt in the system, changes in the initial dye concentration and temperature changes were also investigated for adsorption experiments. The adsorption isotherm for both adsorbents followed the Langmuir model, which predicted the maximum adsorption capacity at room temperature to be 344.82 and 285.71 mg/g for the surfactant-modified adsorbent and the magnetic organo-bentonite adsorbent, respectively. Thermodynamic studies showed that the adsorption process for both adsorbents is spontaneous and exothermic, and regenreration experiments for magnetic adsorbents stated that the fourth time the adsorbent is used, it retains 83% of its adsorption capacity in the first use.

محمدرضا احساني، كيومرث زرگوش

مهدي بازرگاني پور، حميد زيلويي