Efficient and selective adsorption of multi-metal ions using sulfonated cellulose as adsorbent

Area of Science:

• Environmental Science
• Materials Science
• Chemistry

Background:

• Heavy metal contamination in wastewater poses significant risks to human health and ecosystems.
• Developing effective adsorbents for heavy metal removal is a critical area of research.

Purpose of the Study:

• To explore sulfonated cellulose (SC) as an efficient adsorbent for removing metal ions from aqueous solutions.
• To investigate the adsorption performance and mechanism of SC for various heavy metals.

Main Methods:

• Characterization of sulfonated cellulose using TGA, XRD, and FTIR.
• Investigating the effects of pH, adsorbent loading, temperature, and initial metal ion concentration on adsorption.
• Evaluating adsorption performance in multi-component solutions and assessing regeneration capabilities.

Main Results:

• Sulfonation decreased cellulose crystallinity and thermostability but enhanced adsorption.
• SC achieved rapid adsorption equilibrium (within 2 minutes) and high efficiency.
• SC demonstrated excellent selectivity and efficiency in removing Fe(3+), Pb(2+), and Cu(2+) from multi-component solutions.
• The sulfonic group was identified as the primary functional group responsible for adsorption.

Conclusions:

• Sulfonated cellulose is a highly effective, selective, and rapidly acting adsorbent for heavy metal ions.
• SC offers a green, renewable, and regenerable solution for wastewater treatment.
• The sulfonic group's crucial role in adsorption provides insights for designing advanced materials.