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Organic plant wastes as adsorbents used in water purification systems


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Год выпуска: 2012
Автор: Josiane Ponou and Toyohisa Fujita
Издательство: LAP Lambert Academic Publishing
Страниц: 112
ISBN: 9783659232220
Описание
 Adsorption studies of Cr(VI) were conducted on 623 K or 723 K carbonized pineapple leaves as well as on dried ones. ThermoGravimetric/Differential Thermal Analysis (TG-DTA) of raw pineapple leaves revealed two main peaks indicating the change in structure of the material with increasing temperature. Some important parameters such as pH, contact time and solution temperature were evaluated. The results shown the high dependence on the parameters with Cr(VI) anions uptake. The removal rate of 90.1 % and the maximum adsorption capacity of 18.77 mg/g were obtained for 723 K carbonized pineapple leaves. Consistent with an endothermic reaction, the mechanism was found to be chemisorption and the system was well described by the pseudo-second order kinetic model. The intraparticle diffusion model, on the other hand, indicated that the system is governed by both film diffusion and intraparticule diffusion. Adsorption isotherm data were described by both Langmuir and Freundlich models. The...

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Евгения, 05.06
Ого!!! Спасибо))))