Electrospun of polyvinyl butyral on the removal of methylene blue dye
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Date
2019-06
Authors
Shahrizat Marwan Bin Shafiq Mathews
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Abstract
Bentonite modified adsorbent coating with different concentration of polyvinyl butyral (PVB) and solvents such as ethanol, butanol and acetic acid has been developed and coated on the cotton cloth to determine the best coating for electrospinning process. The influence of various factors was investigated mainly for the adsorption of methylene blue (MB) solution on cotton cloth. The result from the studies revealed coating with 12% PVB with butanol solvents gives the highest MB dye removal efficiency which was 83.1 % for 5 hours contact time. Viscosity plays major role in order as the higher the viscosity it will form continuous and beads-less nanofiber structure where the diameter of the nanofiber form increased. Thus, it was found acetic acid gives the highest viscosity among butanol and ethanol. Qualitatively, there were no agglomeration of all the bentonite coating observed. Lower solubility of butanol in PVB is key factors that contribute to the selection of butanol as the best solvent for PVB to form a uniform and continuous nanofiber. 12% PVB with butanol coating was chosen as the best formulation in the electrospinning process and the adsorption of MB dye solution is verified using electrospun nanofibers. The of MB adsorption on electrospun nanofibers gives the highest percentage removal which was up to 85.31 % for 5 hours contact time due its high surface area and highly porous structure. The percentage removal increased with contact time and decrease with increasing initial dye concentrations. Langmuir isotherms was best described the MB adsorption onto the bentonite surfaces.