Browsing by Author "Jemal, Nuriya"

Now showing 1 - 1 of 1
  • No Thumbnail Available
    Item
    Reactive Azo Dye Removal from Aqueous Solution Using Orange Peel As Bio-Adsorbent
    (Addis Ababa University, 2015-07) Jemal, Nuriya; Jabasingh, Anuradha(Perofessor)
    Presence of dyes in the aquatic systems has become a serious environmental problem. Concerning the environmental awareness and the economical point of view, the use of low-cost and eco-friendly adsorbents has been investigated as an ideal alternative to the current expensive methods of removing textile dyes from wastewater. This study explores the feasibility of using orange peel, an agricultural waste, for removal of synthetic dye from aqueous solution. The adsorption characteristics of RR- DEXF dye onto powdered orange peel (POP) as a bio adsorbent that has been previously physically treated was investigated. Batch adsorption experiments were carried out for the adsorption of the dye molecule from aqueous solution onto the POPA at constant room temperature 27oC and agitation speed 200rpm. Variation effect of different parameters like solution pH, adsorbent dose, contact time and the initial concentration of the dye were studied. U V. spectrophotometer technique was used for the measurement of concentration of dye before and after adsorption. Experimental results revealed that optimal adsorption took place at an acidic solution pH. The effective solution pH, adsorbent dose and contact time on the dye removal efficiency of the adsorbent were found to be 3, 0.2g/100mL and 80min, respectively for the adsorption studies. At these experimental conditions the dye removal efficiency of 90% was achieved. The experimental results have been fitted well by the Langmuir isotherm model with the higher correlation coefficients of R2 Keywords: RR-DEXF dye; Powdered orange peel adsorbent (POPA); UV. Spectrophotometer; Adsorption isotherm; Kinetics models; effluents. = 0.995. Thus, indicating to the applicability of monolayer coverage of the dye on the surface of the adsorbent and it was found to be 3.03 mg/g. Adsorption kinetics was determined using pseudo first order and pseudo second order models and it was found that the adsorption process follows pseudo second order model. Generally the results indicate that POP may be used as a low cost adsorbent, alternative for treatment of effluents containing reactive red dye in water.