Removal of Anionic Dye from Aqueous Media by Adsorption onto SBA-15/Polyamidoamine Dendrimer Hybrid: Adsorption Equilibrium and Kinetics

Extremely ordered mesoporous SBA-15 was prosperously synthesized through a plain sol-gel technique and then was functionalized with polyamidoamine (PAMAM) dendrimer. The structure and chemical properties of the produced materials were identified by Fourier transform infrared spectroscopy, X-ray diffraction, nitrogen adsorption-desorption isotherms, and thermogravimetric analyzer. The surface morphology was recognized by transmission electron microscopy and field emission scanning electron microscopy. The adsorption behavior was determined by adsorption of acid dye on SBA-15/PAMAM. It was considered that SBA-15/PAMAM indicated a very good adsorptive ability of Acid Blue 62 molecules. The effect of different experimental parameters such as pH, adsorbent dosage, contact time, initial dye concentration, and temperature on the adsorption was studied. The isotherm, kinetic, and thermodynamic characteristics were analyzed to define the adsorption manner of produced Nano adsorbent. The Langmuir, Freundlich, and Temkin adsorption isotherm models were applied for analyzing the experimental data, and the results showed a desirable simulation with the Langmuir adsorption isotherm model with a great adsorption valence of 1428.57 mg g(-1), and the adsorption kinetic model was well-fitted by a pseudo-second-order kinetic equation. The adsorption data supported its spontaneous and exothermic property.