Parametric Study on the Adsorption of Crystal Violet from Aqueous Solution Using Polyaniline-Coated Bagasse as Adsorbent
Author : Pasola, Ralph Joshua Mesina
Major Adviser : Capunitan, Jewel A.
Committee Members : Borines, Myra G.; Movillon, Jovita L.; Herrera, Marvin U.
Year : 2019
Month : June
Type : Thesis
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In this study, bagasse was coated with polyaniline through successive ionic layer adsorption reaction (SILAR) method. Surface morphology was determined using SEM while functional groups were detected using FTIR, which confirmed the successful coating of polyaniline onto bagasse. Results were determined through 2k factorial experiments, wherein maximum and minimum parameter values for pH, adsorbent loading, and initial dye concentration were considered. Significant interactions between adsorbent loading – pH and initial dye concentration – pH were noted. Results for adsorbent loading – pH interaction showed that at maximum pH, there is an increase in % crystal violet removal with increase in adsorbent loading. However, at minimum pH, there is a decrease in % crystal violet removal with increase in adsorbent loading, which may be attributed to electrostatic repulsion between crystal violet cations and protonated adsorbent surface. For initial dye concentration – pH interaction, it was observed that at minimum initial crystal violet concentration, there is an increase in % crystal violet removal with increase in pH. However, at maximum initial crystal violet concentration, pH has no effect on % crystal violet removal, which suggests that the ratio between adsorbent active sites to crystal violet concentration was low, inhibiting the adsorption process. The highest % crystal violet removal was 96.73 %, obtained at pH 9, 6 g/L adsorbent loading, and 100 ppm condition. Isotherm experiment determined that the adsorption process follows the Langmuir Type II isotherm, indicating a monolayer adsorption process. Reusability of the adsorbent was also determined to be potentially effective for two successive runs.
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