Parametric Study on the Adsorption of Methyl Orange Dye from Aqueous Solution Using Polyaniline-coated Bagasse as Adsorbent

Author : Vergara, Alyssa Lucillo
Major Adviser : Capunitan, Jewel A.
Committee Members : Borines, Myra G.; Herrera, Marvin; Movillon, Jovita L.
Year : 2019
Month : June
Type : Thesis/Practicum/Innovationeering
Degree: BS
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The utilization of polyaniline (PANI)-coated sugarcane bagasse as adsorbent for the removal of methyl orange dye from aqueous solution was investigated in this study. Batch adsorption experiments were conducted to study the effects of pH, adsorbent loading and initial concentration of the dye on the percent removal of dye using a two-level factorial design with duplicates and four center points. The equilibrium time was achieved after 210 minutes. Results showed that pH, adsorbent loading, initial dye concentration and the interaction between the adsorbent loading and the initial concentration as well as the interaction between the three factors are significant. Higher percent removal achieved at basic condition could be due to the electrostatic attraction between the positively charged PANI and anionic methyl orange. The highest average percent removal of 92.19 % was achieved at pH 9, 10 g/L adsorbent loading and 10 ppm initial dye concentration. The adsorption data for the removal of methyl orange using polyaniline-coated bagasse fits the Langmuir and Freundlich isotherm with R2 value of 0.9910 and 0.9294, respectively. The maximum adsorption capacity of 12.06 mg methyl orange/gram adsorbent was obtained, signifying the potential of the adsorbent for the dye removal. The adsorbent effectively adsorbed the dye molecules in comparison with untreated sugarcane bagasse and it can be reuse twice to achieve a percent removal of more than 80 %.

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