Porous chitosan/hydroxyapatite composite membrane for dyes static and dynamic removal from aqueous solution

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Chitosan (CS)-based membranes are promising adsorbents due to their unique properties like biocompatibility and abundant adsorption sites.
• Existing CS-based membranes face challenges in achieving high adsorption capacity and efficient dynamic pollutant removal.
• Development of advanced membrane structures is crucial for effective wastewater treatment.

Purpose of the Study:

• To develop a novel porous Chitosan/Hydroxyapatite (CS/HA) membrane with enhanced adsorption capabilities.
• To evaluate the membrane's performance in terms of dye removal capacity, speed, and reusability.
• To assess the environmental friendliness and economic viability of the synthesis protocol.

Main Methods:

• Fabrication of a porous CS/HA membrane with a sponge-like surface and a 3D interpenetrated porous structure (mean pore size < 10μm).
• Evaluation of dynamic dye removal efficiency and adsorption capacity compared to existing membranes and activated carbon.
• Testing of membrane reusability through multiple adsorption-desorption cycles.

Main Results:

• The developed porous CS/HA membrane exhibited high adsorption capacity, significantly outperforming non-porous CS/HA membranes and commercial activated carbon.
• Achieved rapid dynamic dye removal, with 98% efficiency in under 15 minutes.
• Demonstrated excellent reusability, retaining over 80% removal efficiency after 5 cycles at a dye concentration of 150 mg/L.

Conclusions:

• The porous CS/HA membrane presents a highly efficient, rapid, and reusable solution for wastewater treatment.
• The simple, eco-friendly, and economical synthesis protocol enhances its practical applicability.
• This advanced membrane adsorbent holds significant potential for industrial wastewater remediation.