ChitosanPoly (Hydroxyethyl Methacrylate) Hydrogel : Preparation, Properties and Application as Adsorbent for Dye Removal from Wastewater
Keywords:
hydrogel , chitosan, poly(hydroxyethyl methacrylate) , adsorbent , dye removalAbstract
Background and Objectives : This research aimed to develop polymeric hydrogel beads for use as dye removal absorbents. Dyes are widely used in various industries. They are one of the pollutants generally found in natural water resources. Due to their stability, dyes in natural water even at low concentrations can cause a serious and long-term impact on our environment.
Methodology : The development of hydrogel beads from a blend of chitosan (CS) and polyhydroxyethyl methacrylate (PHEMA) was achieved by radical polymerization of the hydroxyethyl methacrylate monomer in the reaction mixture containing covalent crosslinked chitosan. The obtained hydrogel beads were chemically modified by hydrolysis to produce functional groups suitable for the application of dye removal from wastewater.
Main Results : The modified hydrogel beads were characterized by FTIR, SEM, swelling test, and adsorption capacity using methylene blue as a model dye. Factors affecting the removal efficiency, blend composition, contact time, solution pH and initial dye concentration were also investigated. The CS-PHEMA hydrogel was effectively capable of methylene blue removal with a maximum adsorption capacity of 327 mg/g. The efficiency of 99.5% was obtained when they were used as absorbent in a 50 ppm MB solution. An investigation on adsorption isotherms was also carried out and it was found that the adsorption fitted well with the Langmuir equation. The MB absorbed hydrogel could be regenerated and reused with no significant loss in adsorption capacity.
Conclusions : The obtained results confirmed that the CS/PHEMA hydrogels developed in this work possessed strong potential for the application of dye removal. They can also be used with repeated adsorption-desorption cycles and with the benefit of lower operation costs.
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