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    Biosorption of cationic dyes from aqueous solution by water hyacinth roots
    (2012) Saltabaş, Ömer; Teker, Murat; Konuk, Zeynep
    Water hyacinth Eichhornia crassipes was found to have biosorption capacity for cationic dyes, malachite green and methylene blue from aqueous solutions. To evaluate the biosorption capacity and characteristics, the effect of solution pH, initial dye concentration, temperature, dose of biosorbent loading, contact time and shaking rate were investigated in a batch mode. Biosorption was increased with the increasing temperature for both studied dyes. The Langmuir and Freundlich adsorption models were used for mathematical description of the sorption equilibrium. Equilibrium data was fitted well to the Langmuir model in the studied concentrations (1-200 mg L -1) at 293 and 313 K. Based on the Langmuir isotherm plots the maximum biosorption capacity values were calculated to be 44.64 mg g -1 for malachite green and 42.55 mg g -1 for methylene blue at 313 K. Various thermodynamic parameters such as ?G°, ?H°, and ?S° were evaluated with results indicating that this system was an endothermic spontaneous reaction and kinetically suited to pseudo-second-order model. © 2012 Global NEST Printed in Greece. All rights reserved.
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    Catalytic reduction of NO x on vanadium exchanged natural zeolite using microwave irradiation
    (2012) Emiroğlu, Alaattin Osman; Eldoğan, O.; Teker, Murat; Keskin, Ahmet; Ekmekçi, İsmail
    Zeolite-based catalysts are used commonly to control NO x emissions in selective catalytic reduction applications in lean combustion gasoline engines. In this study, a catalyst was prepared by ion-exchange of vanadium promoted using microwave irradiation, over the clinoptilolite type of natural zeolite to selectively reduce the nitrogen oxides, especially in lean combustion conditions with the HCs in the exhaust gas. According to experimental results, the maximum NO x conversion efficiency reached 28 % at temperature of 287°C and space velocity of 30,000 h -1. Copyright © 2012 Inderscience Enterprises Ltd.