Abstract
In this study, electrospun cellulose acetate - poly(ethylene oxide) nanofibrous membrane was found to be unique in immobilizing bacterial cells. Here, removal of methylene blue in aqueous media was achieved by using isolated species of bacteria (Bacillus paramycoides) from industrial wastewater and immobilized on cellulose acetate- poly(ethylene oxide) nanofibers using DMSO as a solvent. The decolorization time was varied from 0 to 72 h, different dye concentrations from 20 to 200 mg/L and bacterial cells count was investigated to achieve the maximum MB removal by bacteria-immobilized CA/PEO nanofibrous membrane. The effective dye decolorization was achieved within 48 h and MB removal % was around 93%. Furthermore, reusability of the bacteria-immobilized CA/PEO nanofibrous membrane was tested. It was found that after the 4th usage, 44% of the dye decolorization capacity still could be achieved. These results are promising and suggest that bacteria-immobilized CA/PEO nanofibrous membrane could be economically feasible and eco-friendly when used in MB removal from industrial wastewater. Combination of both adsorption and biodegradation methods was found to be effective in MB removal from aqueous media.
Highlights
In this study, electrospun cellulose acetate - poly(ethylene oxide) nanofibrous membrane was found to be unique in immobilizing bacterial cells
Escherichia coli and Staphylococcus albus were embedded in poly(vinyl alcohol) solution and water was the solvent, the results showed the potential of electrospinning process in immobilization of both bacterial strains on PVA nanofibers[27]
As there is a lack in research studying Dimethyl Sulfoxide (DMSO) as a solvent for cellulose acetate in electrospinning and nanofibers production, optimum conditions for the electrospinning such as polymer concentration had to be optimized
Summary
Electrospun cellulose acetate - poly(ethylene oxide) nanofibrous membrane was found to be unique in immobilizing bacterial cells. It was found that after the 4th usage, 44% of the dye decolorization capacity still could be achieved These results are promising and suggest that bacteria-immobilized CA/PEO nanofibrous membrane could be economically feasible and eco-friendly when used in MB removal from industrial wastewater. Combination of both adsorption and biodegradation methods was found to be effective in MB removal from aqueous media. Approximately 5000 tons of dyes are exhausted into effluents annually[4] As a result, their discharge into the environment is a matter of concern as they may cause pollution for both toxicological and esthetical scales[5]
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