Optimum selective separation of Cu(ii) using 3D ordered macroporous chitosan films with different pore sizes

Area of Science:

• Materials Science
• Environmental Science
• Chemistry

Background:

• Biomaterials often struggle with low surface area, slow adsorption rates, and poor selectivity for heavy metal ion removal.
• Addressing these limitations is crucial for developing efficient water purification technologies.

Purpose of the Study:

• To develop a 3D-ordered macroporous ion-imprinted chitosan film (3DOM-IICF) for enhanced copper ion (Cu(ii)) adsorption.
• To evaluate the adsorption performance, selectivity, and reusability of the 3DOM-IICF.

Main Methods:

• Fabrication of 3DOM-IICF using a colloidal crystal template and ion imprinting (IIP) technology with polystyrene micro-spheres and copper templates.
• Drying to form the final film structure.
• Conducting adsorption experiments to assess Cu(ii) removal efficiency and capacity.

Main Results:

• The 3DOM-IICF demonstrated high adsorption efficiency for Cu(ii) under neutral pH conditions (pH=7.0).
• The maximum adsorption capacity reached 261.31 mg g⁻¹.
• Adsorption kinetics followed the pseudo-second-order model, and adsorption isotherms aligned with the Langmuir model, indicating strong adsorption affinity and monolayer coverage.

Conclusions:

• The 3DOM-IICF exhibits superior selective adsorption capabilities for Cu(ii) compared to traditional biomaterials.
• The material is reusable, maintaining high adsorption capacity over multiple cycles.
• The ion-imprinted template method holds significant promise for selective pollutant adsorption in biomaterials.