Natural Polysaccharide-Based Hydrogels Used for Dye Removal.

Area of Science:

• Environmental Science
• Materials Science
• Polymer Chemistry

Background:

• Contaminant removal from wastewater is crucial for maintaining clean water resources.
• Adsorption is a widely adopted, cost-effective method for water treatment.
• Polysaccharide-based hydrogels show promise as efficient dye adsorbents.

Purpose of the Study:

• To review recent research (last decade) on polysaccharide-based hydrogels for dye adsorption.
• To evaluate the dye removal efficiency of various natural polysaccharides.
• To discuss factors influencing adsorption performance and sustainability.

Main Methods:

• Comprehensive literature review of studies on chitin, chitosan, cellulose, starch, pullulan, and dextran hydrogels.
• Analysis of synthesis methods and dye removal performance.
• Examination of adsorption kinetics, isotherms, and thermodynamic parameters.

Main Results:

• Polysaccharide hydrogels demonstrate high efficiency in dye adsorption from wastewater.
• Factors like pH, temperature, and adsorbent dosage significantly impact dye removal.
• Adsorption follows established kinetic and isotherm models, with favorable thermodynamic profiles.
• Sorbents show good recyclability, enhancing their practical application.

Conclusions:

• Natural polysaccharide hydrogels are sustainable, biocompatible, and cost-effective materials for water purification.
• These hydrogels offer a promising alternative to conventional adsorbents for dye removal.
• Further research should focus on optimizing hydrogel design and exploring large-scale applications.