Mixed-Phase Ion-Exchangers from Waste Amber Container Glass

Area of Science:

• Materials Science
• Environmental Chemistry
• Inorganic Synthesis

Background:

• Waste amber container glass and aluminum waste present disposal challenges.
• Developing efficient ion-exchangers from waste materials is crucial for environmental remediation.
• Hydrothermal synthesis offers a pathway for creating novel functional materials from precursors.

Purpose of the Study:

• To investigate the one-pot hydrothermal synthesis of mixed-phase ion-exchangers.
• To utilize waste amber container glass and various aluminum sources as precursors.
• To evaluate the heavy metal (Pb2+ and Cd2+) uptake capacity of the synthesized materials.

Main Methods:

• One-pot hydrothermal synthesis at 100 °C in 4.5 M NaOH.
• Characterization using X-ray diffraction, FTIR, NMR (27Al, 29Si MAS NMR), and SEM.
• Batch studies for Pb2+ and Cd2+ ion uptake analysis.

Main Results:

• Mixed-phase ion-exchangers containing cancrinite, sodalite, and tobermorite were successfully synthesized.
• Crystallinity varied depending on the aluminum source, ranging from 49% to 65% at 150 h.
• All synthesized materials demonstrated high Pb2+ uptake (~100 mg g-1).
• Sodalite- and tobermorite-rich products showed superior Cd2+ uptake (48-54 mg g-1) compared to cancrinite-rich products (36 mg g-1).

Conclusions:

• Waste glass and aluminum can be effectively converted into mixed-phase ion-exchangers.
• The synthesized materials exhibit promising ion-exchange capabilities for heavy metal removal.
• These waste-derived sorbents offer a sustainable and cost-effective alternative for environmental remediation.