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Removal of Astrazone Blue from aqueous solutions onto brown peat. Equilibrium and kinetics studies
Lacramioara Rusu,Maria Harja,Andrei Ionu Simion,Daniela Suteu,Gabriela Ciobanu,Lidia Favier 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
The aim of this study is to characterize and assess the sorption potential of brown peat, in relation to coloredpollutants from the textile industry wastewater. The objectives of this paper were: the physicochemical, morphological,and mineralogical characterization of brown peat, testing the adsorption capacity of natural and chemically treatedpeat samples for Astrazone Blue, evaluation of adsorption process from equilibrium isotherm and kinetic point of view. The characteristics of the peat samples were investigated using elemental analysis, scanning electron microscopy andX-ray diffractometry. Experimental data indicated that the brown peat tested confirm a high level of adsorption (removalefficiency >93.00%, adsorption capacity reaching up to 24.27 mg/g) of Astrazone Blue from aqueous solution. TheLangmuir and Freundlich adsorption isotherm models were used to find the best equation able to describe the adsorptionprocess. Experimental adsorption data were successfully described by the Langmuir equilibrium isotherm model. This fact is supported by the agreement between the q values obtained using the Langmuir equation (26.32 mg/g), andthe ones obtained experimentally (24.27 mg/g). The kinetic studies showed that the pseudo-second-order model describedAstrazone Blue sorption kinetics, as confirmed by the high values of R2, which are over 0.99 for the wholeinvestigated concentration range (200 to 800 mg/L). The use of brown peat adsorbent is more advantageous comparedwith other materials since it does not require a preliminary treatment, is low-cost and is an eco-friendly adsorbent. Hence,this peat appears to be a viable material for the decontamination of effluents containing dyes.
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