Study of Adsorption Performance of BFA For Removal of MG and MB Dye Mixture from Aqueous Solution

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Addis Ababa University


The excessive release of dye pollutants from the textile, paper, and leather industries are major sources of environmental pollution. Adsorption process is among the most effective techniques for color removal from wastewater. In this study, bagasse fly ash has been used as an adsorbent for the removal of Malachite Green (MG) and Methylene Blue (MB) mixture of dyes from aqueous solution. Characterization of the BFA was made by proximate analysis to determine the optimum particle size that should be used for the adsorption process and also Fourier Transform Infrared (FTIR) spectroscopy to reveal the functional group responsible for the process. Particle size of less than 250 μm bagasse fly ash was employed for all experiments due to its high ash content of 81.63%. The raw bagasse fly ash obtained was treated using H2O2 and tested for its efficiency and compared with the untreated bagasse fly ash. The adsorption studies were carried out to assess the effect of various parameters such as initial dye concentration, contact time, adsorbent dose and pH and determine the maximum operating condition of the process for the removal of both dyes. Initial adsorption study carried out using 0.5 g adsorbent dose for concentrations (50, 75 and 100 ppm), pH (6, 8, and 10) and different time (10, 30, 60, and 90 min) resulted in a maximum adsorption capacity of 21.16 mg/g (79.39%) for MG and 16.59 mg/g (71.05%) for MB. This maximum values were all obtained at concentration of 100 ppm, pH 10, and time of 90 minute. In order to understand the mechanism of the adsorption process, the sorption data were analyzed using Langmuir and Freundlich isotherm models. The linear form of both models was fitted with the data and resulted in good conformation with both models and for each dyes. Finally, the rate of the adsorption process was investigated using Pseudo-first order kinetics and Pseudo second-order kinetic models. Pseudo second-order kinetic model was found to be well fitted to the data obtained.



BFA, MG, MB, Dye Mixture, Adsorption Performance