Synthesis and adsorption properties of mesoporous material for the removal of dye safranin: Kinetics, equilibrium, and thermodynamics

• Synthesis and characterization of material and template removal by solvent extraction.
• Optimization of parameters: contact time, initial dye concentration, adsorbent dose, and pH.
• Isotherms: Langmuir, Freundlich, Tempkin, D–R, and NICA models.
• Kinetics: pseudo first order, second order, Weber and Morris, Elovich, and Bangham.
• Error functions, activation and thermodynamics parameters.

A highly ordered large pore mesoporous adsorbent MCM-41 is synthesized and characterized by XRD, BET, FTIR and SEM. Effect of contact time, initial dye concentration, adsorbent dose, pH and temperature were studied for adsorption of dye safranin on MCM-41. Experimental data were investigated for various thermodynamic models and kinetic models and corroborated that adsorption followed second order kinetic model. Langmuir model evidenced the maximum adsorption capacity as 68.8 mg g−1 at 303 K. Thermodynamic parameters surmised that adsorption of safranin on MCM-41 is spontaneous, exothermic and feasible.

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