Journal Articles
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/19884
Browse
4 results
Search Results
Item Defluoridation of fresh water using the process of Electrocoagulation combined with Adsorption(2013) Wali, A.; Saidutta, M.B.In India, fluoride is the major inorganic pollutant of natural origin found in groundwater. Fluoride pollution occurs due to natural and manmade reasons and high concentrations have a detrimental effect on health. Electrochemical techniques like Electrocoagulation(EC) appears to be one of the most effective approaches for treatment of water and wastewater because of its versatility, safety, selectivity, amenability to automation and environmental compatibility. Results show that the percentage removal of fluoride was around 94 to 96% for monopolar and bipolar electrodes. Adsorbents like tricalcium phosphate and activated alumina used along with electrocoagulation process also gave promising results. © 2013 CAFET-INNOVA TECHNICAL SOCIETY.Item Studies on biosorption of methylene blue from aqueous solutions by powdered palm tree flower (Borassus flabellifer)(2014) M Kini, M.S.; Saidutta, M.B.; Ramachandra Murty, V.R.Biosorption experiments were carried out for the removal of methylene blue (MB) using palm tree male flower (PTMF) as the biosorbent at various pH, temperature, biosorbent, and adsorbate concentration. The optimum pH was found to be 6.0. The kinetic data were fitted in pseudofirst-order and second-order models. The equilibrium data were well-fitted in Langmuir isotherm and the maximum equilibrium capacities of the biosorbent were found to be 143.6, 153,9, 157.3 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 15.06 KJ/mol and 0.129 KJ/mol K, respectively, in the temperature range of 303-323 K. A mathematical model for MB transported by molecular diffusion from the bulk of the solution to the surface of PTMF was derived and the values of liquid phase diffusivity and external mass transfer coefficient were estimated. © 2014 M. Srinivas Kini et al.Item 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.Item A new chitosan biopolymer derivative for the removal of copper (II) and lead (II) from aqueous solutions: Synthesis, characterization and adsorption studies(Penerbit UTM Press, 2017) Balakrishna Prabhu, K.B.; Saidutta, M.B.; Isloor, A.M.; Kamath, G.A new chitosan derivative was prepared by grafting a ligand [3-(4methoxyphenyl)-1H-pyrazole-4-carbaldehyde] to chitosan by a Schiff base reaction. The chitosan-ligand derivative (CTSL) was characterized by spectral studies (FT-IR,13C NMR, XRD) and scanning electronic microscope. The suitability of CTSL as an adsorbent for the removal of two metals viz. Cu (II) and Pb (II) was studied by conducting equilibrium, kinetic and thermodynamic studies. Experimental data obtained in equilibrium studies were analyzed for Langmuir, Freundlich, and Redlich-Peterson isotherms. The maximum monolayer adsorption capacity obtained for the two metals were CTSL-Cu (40.62 mg/g) and CTSL-Pb (71.99 mg/g). The data obtained from the kinetic study was analyzed with three models viz. pseudo-first order, pseudo-second order and intraparticle diffusion models. The pseudo-second-order rate equation fitted the experimental data very well. Thermodynamic parameters ?G, ?H and ?S were determined. The sorption operation was feasible, exothermic and accompanied with a positive increase in entropy. The metal interactions with the adsorbent were attributed to the hydroxyl, imine and the amine groups present in the synthesized derivative. © 2017 Penerbit UTM Press. All rights reserved.