Agullo, Nicole C. <br/><br/>
Chitosan-functionalized activated biochar from pomelo peel waste for methyl orange dye removal/ 
Nicole C. Agullo, Mitzi B. Laxamana, and Loiza Mae A. Panoy.-- 
 - Manila:  Technological University of the Philippines,  2025. 
 - xi, 93pages:  29cm. 
<br/><br/> Bachelor's thesis<br/><br/><br/> 
<br/><br/>College of Science.--<br/> 
<br/><br/>Includes bibliographic references and index. 
<br/><br/> This study aimed to develop chitosan-functionalized activated biochar (FPPAB)<br/>from pomelo peel waste for the removal of Methyl Orange (MO) dye from aqueous<br/>solutions. It sought to synthesize FPPAB through phosphoric acid activation, pyrolysis,<br/>and chitosan coating; evaluate its performance against unmodified and activated biochar;<br/>optimize key adsorption parameters; characterize the material; and identify the<br/>applicable adsorption kinetics and isotherm models. The biochar was characterized<br/>using FTIR, SEM, and EDX, confirming successful functionalization and surface<br/>modification. Batch adsorption experiments were conducted to assess the effects of<br/>contact time, initial concentration, pH, and temperature, with UV-Vis spectrophotometry<br/>used to measure dye removal. FPPAB achieved a maximum removal efficiency of<br/>98.97% under optimal conditions: 0.1 g dosage, 25 minutes contact time, 90 ppm<br/>concentration, and pH 3 at 50°C. The process followed pseudo-second-order kinetics (R2<br/>= 0.9999) and aligned with the Freundlich isotherm model (R2 = 0.8942). The findings<br/>highlight FPPAB as a promising, eco-friendly adsorbent for wastewater treatment. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Orange adsorption<br/>Chitosan coating<br/>Adsorption efficiency
<br/><br/><label>LC Class. No.: </label>BTH RB 37   / A38 2025