Browsing by Author "M Kini, M."

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    Adsorption of basic dye onto activated carbon prepared from Palm Tree flower (Borassus flabellifer): Kinetics, equilibrium study and mathematical model
    (Research India Publications subscription@ripublication.com, 2015) M Kini, M.; Saidutta, M.B.; Ramachandra Murty, V.
    Adsorption experiments were carried out for the removal of Methylene blue (MB) using Palm Tree Male flower activated carbon (PTMFAC) as the adsorbent at various temperature, adsorbent and adsorbate concentration. The kinetic data were fitted in pseudo-first order, second order models. The equilibrium data were well fitted in Langmuir isotherm and the maximum equilibrium capacities of the adsorbent were found to be 541.2, 550.4, 588.2 mg/g at 303, 313, and 323 K, respectively. Thermodynamic data for the adsorption system indicated spontaneous and endothermic process. The enthalpy and entropy values for adsorption were obtained as 10.5 KJ/ mol and 0.113 KJ/ mol K respectively in the temperature range of 303-323 K. A new mathematical model for MB transported by molecular diffusion from the bulk of the solution to the surface of PTMFAC was derived and the values of liquid phase diffusivity and external mass transfer coefficient were estimated. © Research India Publications.
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    Adsorption of hexavalent chromium from aqueous medium using a new Schiff base Chitosan Derivative
    (Research India Publications subscription@ripublication.com, 2017) Balakrishna Prabhu, K.; Saidutta, M.B.; M Kini, M.
    Modification of chitosan biopolymer was achieved by grafting (3-phenyl-1H-pyrazole-4-carbaldehyde) by the Schiff base reaction to synthesize a new chitosan derivative (ChD). The formation of the product was confirmed by FTIR, XRD and 13CNMR analysis. The grafted molecule provided additional nitrogen bearing groups as binding sites. The new derivative was used to investigate the removal of Cr (VI) ions in water. The sorption was best favoured at a pH of 3.0. From the Langmuir isotherm, the maximum monolayer adsorption capacity for the adsorbent was determined (Qo=63.5 mg/g). The sorption data fitted satisfactorily to the Redlich-Peterson isotherm. The kinetics of adsorption was best described by pseudo-second order rate equation. The thermodynamic study revealed that the adsorption of Cr (VI) on to ChD was spontaneous and accompanied by increase in entropy. The metal removal was favoured at lower temperatures indicating that the adsorption was exothermic in nature. © Research India Publications.