Abstract
Exopolysaccharide (EPS) was extracted from Bacillus sp. and purified by ethanol precipitation method. This work mainly examines the dye removal efficiency of biopolymer beads (sodium alginate microcapsules) encapsulated with EPS extracted from Bacillus sp. Encapsulation of EPS-modified sodium alginate microcapsule was done by co-polymerization method. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) confirmed the co-polymerization of sodium alginate and EPS in the microcapsule. The adsorption capacity of the microcapsule was found to be 0.58682 mg/mL which can be attributed to the larger surface area and increased surface sites in the microcapsule adsorbent. Increased dye removal efficiency of 83% was observed for the microcapsule with 50 mg/mL of EPS. The results of the methylene blue dye adsorption experiment show that the adsorption fitted into the Freundlich isotherm and followed pseudo-second-order reaction with correlation coefficients of 0.939 and 0.9673, respectively. The prepared sodium alginate biopolymer is biodegradable, and numerous studies have documented its biodegradability. Overall, these results evidenced that dye adsorption from textile effluent can be easily managed using the biodegradable polymer materials. Hence, this immobilization approach can be effectively used in textile dye removal process.
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