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Title: Removal of Reactive Red Dyes From Textile Wastewater By Biosorption Using Mango and Papaya Seeds
???metadata.dc.contributor.*???: Beteley Tekola (PhD)
Tariku, Ayala
Keywords: RR dye;Mango seeds and Papaya seeds biosorbents (MS and PS);UV;Spectrophotometer;Biosorption isotherm;Kinetics models;effluents
Issue Date: Jun-2016
Publisher: AAU
Abstract: Presence of dyes in the aquatic systems has become a serious environmental problem. Based on this idea focusing the environmental issue and economic point of view, the use of low cost and eco-friendly biosorbents has been investigated as an alternative to the current expensive methods of removing the textile dyes from wastewater. This study ensures the feasibility of using mango seeds, Papaya seeds and agricultural waste, for removal of synthetic dye from aqueous solution. The biosorption characteristics of RR dye onto mango seeds and papaya seeds have been studied in this research. The experimental design used for experiments is full factorial. Batch biosorption experiments were carried out for the biosorption of the dye molecule from aqueous solution onto the PS and MS at constant room temperature 25oC and agitation speed 150rpm. The effects of different parameters like solution pH, biosorbent dose, contact time and initial concentration of dye were studied. U.V spectrophotometric technique was used during experiment for measuring of dye concentration before and after biosorption. Experimental results revealed that high biosorption took place at acidic pH. The effective solution pH, biosorbent dose, and contact time on the dye removal efficiency of the biosorbents were found to be 4.0, 3g/200ml, and 180min, respectively for the biosorption studies. At these experimental conditions the dye removal efficiency of 69% and 99.94% were achieved by mango seeds and papaya seeds respectively. The experimental results have been fitted well by the Langmuir isotherm model with the higher correlation coefficients of R2 = 0.975 and 0.9985 for papaya seeds and mango seeds respectively. Thus, indicating to the applicability of monolayer coverage of the dye on the surface of the biosorbents and they were found to be 2.028 & 3.754 mg/g. Biosorption kinetics was determined using pseudo first order and pseudo second order models and it was found that the biosorption process follows pseudo second order model for Papaya seeds and pseudo first order for mango seeds.
Appears in Collections:Enviromental Engineering

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