Parametric Study on the Adsorption of Methylene Blue from Aqueous Solution using Graphene Oxide/Cellulose Composite
Author : Pagatpatan, Enrico Miguel Calinagan
Major Adviser : Gatdula, Kristel M.
Committee Members : Dizon, Lisa Stephanie H.; Sanchez, Denise Ester S.
Month : June
Type : Thesis
Degree: BS
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Abstract
This study prepared graphene oxide/cellulose (GOC) composite and determined the significant parameters and their interactions involved in the adsorption of methylene blue (MB) in aqueous solution. Graphene oxide (GO) was carried out by the modification of Hummers’ methods, cellulose was extracted from rice hulls via alkaline peroxide treatment, and GOC was prepared by ultrasonication and dissolution of cellulose in urea- NaOH solution. BJH analysis of GO revealed that the used (desorbed) GO had surface area of 6.980 m²/g, pore volume of 0.039 cm³/g, and pore radius of 1.719 nm. TGA analysis of treated RH showed that cellulose was 47.98 %, hemicellulose and lignin were 23.92 %, and residual char was 28.10 %. The values of these properties were small compared to literature values but GOC produced was still good for adsorption of dye wastewater. The half-factorial resolution experiments revealed that the significant factors were: (a) initial pH level, (b) adsorbent loading, (c) contact time, and (d) interaction of mass ratio of GO to cellulose and contact time. The highest percent color removal was recorded to be 73.87 % at 1.0 g adsorbent dosage with 25 wt% mass ratio of GO to cellulose, 1.5 h contact time, and initial pH value of 5.
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