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Sumanjit Kaur,Seema Rani,Vipin Kumar,R.K. Mahajan,Mohammad Asif,Inderjeet Tyagi,Vinod Kumar Gupta 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
Mesoporous adsorbent is prepared first time using ferrocene based surfactant as a template and adsorption of azo dye Congo red is investigated. Adsorbent is characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, dynamic light scattering and N2 adsorption–desorption and deduced a lofty surface area of 342 m2/g. Effect of contact time, adsorbent dose, initial dye concentration and temperature were speculated to optimize adsorption conditions. Experimental data were contemplated for various kinetics and thermodynamic models at different temperatures and insinuated that adsorption process is film diffusion controlled and followed second order kinetics. Langmuir model imparted high value of monolayer capacity as 312.5 mg/g. The values of thermodynamic parameters like enthalpy (DH) and entropy (DS) were found to be 49.94 kJ/mol and 265.5 J/K/mol, respectively, and negative values of DG corroborated that the present adsorption system is feasible, spontaneous and endothermic.
Sumanjit Kaur,Seema Rani,R.K. Mahajan,M. Asif,Vinod Kumar Gupta 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
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 temperaturewere studied for adsorption of dye safranin on MCM-41. Experimental data were investigated for variousthermodynamic models and kinetic models and corroborated that adsorption followed second orderkinetic 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.