Parametric Study on the Decolorization of Direct Turquoise Blue GL Dye using Acid-Treated Bagasse Bottom Ash as Adsorbent
Author : Prieto, Aaron Paul Ventar
Major Adviser : Movillon, Jovita A.
Committee Members : Arocena, Rhebner E.; Valencia, Jeanne Michelle T.
Year : 2016
Month : December
Type : Thesis
Degree: BS
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Abstract
A parametric study on the adsorption of Direct Turquoise Blue GL dye using chemically-treated bagasse bottom ash was conducted using 2ᵏ factorial experimental design. Preliminary study was first conducted to determine the type of bagasse ash treatment (untreated, alkaline-treated and acid-treated bagasse ash) that would result to the highest adsorptive capacity of the bagasse adsorbent. Acid-treated ash had the highest adsorption performance (84.74% dye removal) and was used for the parametric analysis. The parametric experiment involved the effects of initial dye concentration (10, 50 ppm), pH (2.0, 12.0) and contact time (30, 60 minutes) on the dye removal. Using analysis of variance (ANOVA), the most favorable conditions for dye adsorption were at low pH (2.0), low initial concentration (10 ppm) and high contact time (60 minutes) Among the parameters, increasing contact time had the highest contribution to the positive increase in terms of percent dye removal 50.05% while decreasing pH had 39.07%, decreasing initial dye concentration had 4.55% and the contact time-pH interaction had a minimal 3.42%. Several adsorption isotherms (Langmuir, Freundlich, Redlich-Peterson and Sips isotherm models) were used to find the best fit isotherm model for dye adsorption. Using different dye solution concentrations, Langmuir isotherm model was the best fit isotherm (R² = 0.9859 and 12.37% error), which signifies homogenous, monolayer chemisorption was dominant over physisorption. The maximum adsorptive capacity (qₘₐₓ) for this isotherm model was 7.4001 mg/g.
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