Adsorption of cationic dyes with electrospun adsorbent fibers
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Keywords:
Polyacrylonitrile, Bentonite, Electrospinning, Adsorption, Cationic DyeAbstract
The use of electrospun fiber using polyacrylonitrile (PAN) as an adsorbent is a promising
premise in the treatment of dyed wastewater, such as brilliant green dye, from the environment.
Electrospinning is the technology where polymer solutions can be formed into micro to nano-sized fibers
that contain massive potential in wastewater treatment technology. In the present study, PAN/Bentonite
(PAN/Ben) was prepared by suspending bentonite powder in PAN solution before the electrospinning
process. The composite electrospun adsorbent fiber is then used for treating cationic dye wastewater. The
composition and morphology study of the adsorbent fiber found that the diameter of the fibers formed at
3.42 µm with elements of bentonite embedded in it. The adsorption ability of the adsorbent fibers reached
96% removal of 100 ppm dye concentration, with 64.84 mg/g adsorption capacity. The batch adsorption
analysis demonstrated that the adsorption process followed the Langmuir isotherm best, showing that the
adsorption process consists of monolayer adsorption on the surface of the adsorbent fiber. The experimental
data fits better in the pseudo-second order kinetic model, proving the adsorption to be chemisorption. The
pH and temperature study found that the adsorbent performs better as the pH levels increase from neutral
to basic conditions, meanwhile the fiber adsorption ability improves as the temperature of the solution
increase. The present work can provide new ways to utilize the electrospinning technology for adsorption
fibers.
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