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Manimekalai T.K.,k-Technology | Sivakumar N.,Chikkanna Government Arts and Science College | Periyasamy S.,PSG College of Technology
International Journal of ChemTech Research | Year: 2015

Plastic waste activated through CO2 carbon (PWAC) was studied as an adsorbent for the removal of acid red 114 from textile industry effluent. Plastic waste carbon was obtained from pyrolysis of commonly used three polymer materials PP, PVC and PET at 600 °C in N2 atmosphere. AC activated carbon was analyzed by SEM, FTIR and EDAX. The adsorption capacity of the acid red 114 dye was evaluated through equilibrium and kinetic studies. Equilibrium isotherms were analyzed by Langmuir, Freundlich, Dubinin– Radushkevich, Temkin, Jovanovic and Halsey models. Langmuir isotherm model showed a best fit for the adsorption of acid red 114 with maximum monolayer coverage of 159.18 mg/g. The adsorption capacity of AC was strongly dependent on the temperature and external surface of the activated carbon. The experimental data were applied to adsorption kinetic models and the results indicated that the adsorption behavior of PWAC was described very well by the second-order kinetics model with high correlation coefficients. The thermodynamic parameters (ΔHº, ΔSº, and ΔGº) showed that the adsorption of acid red 114 was feasible, exothermic and spontaneous at 303, 318 and 333 K. © 2015, Sphinx Knowledge House. All rights reserved. Source


Manimekalai T.K.,k-Technology | Sivakumar N.,Chikkanna Government Arts and Science College | Periyasamy S.,PSG College of Technology
Digest Journal of Nanomaterials and Biostructures | Year: 2015

The char prepared from three different types highly used plastics wastes, i.e., polypropylene (PP), polyethyleneterepthalate (PET), polyvinylchloride (PVC) with HZSM-5 catalyst was activated by CO2 at 900oC. The prepared plastic waste activated carbon (PWAC) was characterized by SEM, XRD and FT-IR analysis. Experiment was carried out equilibrium, kinetics and thermodynamics of basic green 4 adsorption onto PWAC as function of pH, adsorbent dosage, initial concentration and temperature. The equilibrium adsorption isotherms models of Langmuir, Freundlich, Temkin, Halsey, Jovanovic and Dubinin-Radushkevich were tested for the quantitative description of the dye adsorption. The Langmuir isotherm provided the best fit for dye adsorption onto the prepared activated carbon and the maximum monolayer adsorption capacity of Basic green 4 was found to be 92.73 mg.g-1. The adsorption process well fitted for pseudo second order kinetic model. The activation energy of the system was calculated as 1.434 kJ/mol. Thermodynamic parameters revealed that the adsoption was a physical process, spontaneous and exothermic in nature. The kinetic and isotherm model data was confirmed by linear error analysis. © 2015, Inst Materials Physics. All rights reserved. Source


Manimekalai T.K.,k-Technology | Tamilarasan G.,Chikkanna Government Arts and Science College | Sivakumar N.,Chikkanna Government Arts and Science College | Periyasamy S.,PSG College of Technology
International Journal of ChemTech Research | Year: 2015

Activated carbon prepared by CO2 activation of pyrolysed chars of waste plastic materials used as a high-efficiency adsorbent for the removal of a reactive dye from textile industrial effluents. Characterizations of the synthesized plastic waste activated carbon (PWAC) were analyzed using SEM, XRD and FTIR analysis. The effects of temperature, initial concentration, and contact time were systematically investigated. The equilibrium adsorption data fitted the Langmuir isotherm well and the monolayer adsorption capacity was 68.21 mg/g. Moreover, kinetics of adsorption exhibit followed the pseudo-second-order kinetic model. Thermodynamic parameters such as Gibbs free energy, enthalpy and entropy were determined. It was found that reactive dye adsorption was spontaneous, exothermic and physisorption process. © 2015, Sphinx Knowledge House. All rights reserved. Source

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