Dye removal by eco-friendly physically cross-linked double network polymer hydrogel beads and their functionalized...

Area of Science:

• Materials Science
• Environmental Science
• Polymer Chemistry

Background:

• Hydrogels are cost-effective materials for pollutant interaction in wastewater treatment.
• Double network hydrogels offer superior properties compared to single network variants.
• Developing advanced hydrogel materials is crucial for effective water remediation.

Purpose of the Study:

• To synthesize and characterize eco-friendly, physically cross-linked double network hydrogel beads (DAP).
• To investigate the adsorption mechanism and capacity of DAP for Methylene Blue (MB).
• To explore the functionalization of DAP with inorganic materials for enhanced water treatment applications.

Main Methods:

• Preparation of double network hydrogel beads (DAP) via physical cross-linking.
• Adsorption studies of Methylene Blue (MB) under varying conditions (pH, time).
• Thermodynamic analysis and isotherm modeling (Langmuir model).
• Functionalization of DAP with activated carbon, Fe3O4, and graphene oxide (GO).
• Evaluation of composite materials as heterogeneous Fenton catalysts for MB degradation.

Main Results:

• DAP exhibits optimal MB adsorption under alkaline conditions, reaching equilibrium within 10 hours.
• Adsorption process is exothermic and spontaneous, well-described by the Langmuir model.
• Maximum monolayer adsorption capacity of DAP is 1437.48 mg/g, exceeding single network hydrogel beads (SAP).
• Functionalized composites, particularly with GO, show increased pore size and adsorption capacity.
• Fe3O4-containing composites demonstrate excellent performance as heterogeneous Fenton catalysts for MB degradation.

Conclusions:

• Physically cross-linked double network hydrogel beads are effective adsorbents for Methylene Blue.
• Functionalization with inorganic materials significantly enhances adsorption and catalytic degradation performance.
• These advanced polymer double network materials show great potential for environmental remediation applications.