Structure and properties of cellulose/HAP nanocomposite hydrogels

Area of Science:

• Materials Science
• Environmental Science
• Polymer Chemistry

Background:

• Cellulose is an abundant natural polymer with desirable properties like stability and biodegradability.
• Pure cellulose-based materials often have insufficient adsorption capacity for heavy metal removal.
• Improving cellulose properties is crucial for expanding its applications in environmental remediation.

Purpose of the Study:

• To synthesize and characterize novel cellulose/hydroxyapatite (HAP) nanocomposite hydrogels (CHG).
• To evaluate the enhanced properties of CHG, focusing on thermal stability, mechanical strength, and heavy metal adsorption.
• To assess the recyclability of CHG as a potential absorbent for heavy metal ions.

Main Methods:

• Hydroxyapatite (HAP) nanoparticles were synthesized.
• HAP nanoparticles were incorporated into cellulose hydrogels (CG) to form CHG.
• The structure, thermal stability, mechanical strength, and adsorption capacity of CHG were systematically characterized.
• Adsorption studies were conducted for Cu2+ ions, and recyclability was tested over 10 cycles.

Main Results:

• HAP nanoparticles were uniformly distributed within the CG matrix.
• The maximum decomposition temperature of CG increased from 334.6°C to 346.7°C in CHG.
• Compressive strength of CG increased from 100 kPa to 570 kPa with HAP incorporation.
• CHG exhibited over 300% higher adsorption capacity for Cu2+ compared to CG.
• CHG demonstrated good recyclability, retaining over 78% efficiency after 10 cycles.

Conclusions:

• The incorporation of HAP nanoparticles significantly enhances the properties of cellulose hydrogels.
• CHG materials show superior thermal stability, mechanical strength, and heavy metal adsorption capacity.
• The developed CHG is a promising and recyclable absorbent for effective removal of heavy metal ions from wastewater.