Modification of Coconut Coir Fibers to Enhance the Adsorption Efficiency of Methylene Blue Dye
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Abstract
This study investigated the extraction and modification of cellulose from coconut coir fibers using hydrogen peroxide and sodium hydroxide for application as an adsorbent for methylene blue dye. After the modification process, the cellulose yield was 70%. The effectiveness of the modification process was confirmed through the analysis of functional groups, surface morphology, and elemental composition using Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and Energy Dispersive Spectroscopy (EDS), respectively. The results indicated that lignin and hemicellulose were effectively removed, resulting in a rougher and more porous cellulose surface. The adsorption study revealed that the optimal conditions for methylene blue removal were a pH of 7, an initial dye concentration of 150 mg/L, an adsorbent dosage of 0.05 g, a contact time of 60 min, and a temperature of 30 °C, under which an adsorption capacity as high as 73.48 mg/g was achieved. The adsorption isotherm fitted well with the Langmuir model, indicating monolayer adsorption, while the adsorption kinetics followed the pseudo-second-order model, suggesting that the process occurred via a chemisorption mechanism. These results demonstrate that cellulose derived from coconut coir fibers possesses strong potential as an environmentally friendly adsorbent for the treatment of wastewater contaminated with organic dyes.
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References
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