Parametric and Kinetic Study on the Removal of Methylene Blue from Aqueous Solution Using Pelletized Bagasse Fly Ash as Adsorbent

Author : Manalo, Ronnalyn Bulanadi
Major Adviser : Arocena, Rhebner E.
Committee Members : Gatdula, Kristel M.; Capunitan, Jewel A.
Year : 2019
Month : June
Type : Thesis
Degree: BS
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Methylene blue (MB), one of the dyes that is often found in textile wastewater, must be removed before it reaches any body of water. Bagasse fly ash (BFA), a waste product of the sugar production, is produced in large amounts and needs to be disposed. In this study, BFA was made into pellets and was utilized as an adsorbent for the removal of MB. The study was conducted at 2.5 g/L and 10 g/L adsorbent loading, 100 ppm and 250 ppm initial MB concentration, pH 2 and 8, and with or without agitation to explore their significance and effect on the adsorption process of MB. The results showed that the adsorbent loading, agitation, interaction of pH and agitation and interaction of initial MB concentration and pH and agitation are all significant factors. At pH 2, 2.5 g/L adsorbent, 250 ppm and with agitation, the highest Qe was recorded at 15. 2413 mg/g. This set of parameters were also used for the kinetic study that yielded the rate equation, -r=6×10^(-5) C_t^2 after having the best fit at the linearized pseudo-second order kinetic model with R2 = 0.8692 and it also best fits the Langmuir isotherm model at R2 =0.87 indicating a monolayer adsorption with a maximum monolayer adsorption capacity (Qmax) of 37.45 mg/g . The separation factor, RL, is 0.94 which indicates a favorable adsorption. It was also found that at 46 hours, the adsorption process has reached it equilibrium with Q = 60.80 mg/g from the isotherm linearized equation.

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