Egg White Cryogel for Removal of Methylene Blue from Aqueous Solution

Abstract

Macroporous egg white (EW) cryogel synthesized by cryogelation at sub-zero temperature (-18oC) with crosslinker glutaraldehyde (GA) was tested in the sorption of methylene blue (MB) as a model water pollutant from aqueous solution. The characterization of obtained cryogel was performed by Fourier-transform infrared spectroscopy and scanning electron microscopy. The pseudo-first order and pseudo-second order models were used to predict the adsorption kinetics. The adsorption followed the pseudo-second order model and experimental adsorption capacity was closer to the calculated one. Two isotherm models called Langmuir and Freundlich were fitted on the experimental data to predict the maximum capacity and process of the adsorption. It was found that Langmuir model isotherm provided the best fit with maximum adsorption capacity of 56.18 mg MB/g cryogel. The dyed EW cryogel was easily regenerated and used several times with no noticeable reduction of capacity. The electrostatic attraction was the main adsorption mechanism of MB on the cryogel, especially at slightly basic pH. Hence, easy preparation, cheapness and good adsorption property make the EW cryogel an economically promising adsorbent for environmental application.

Keywords

• Cryogel
• Biosorbent
• Egg White
• Methylene Blue
• Adsorption

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