Cellulose-based films prepared directly from waste newspapers via an ionic liquid

Area of Science:

• Materials Science
• Green Chemistry
• Chemical Engineering

Background:

• Waste newspapers are abundant, low-cost resources primarily composed of cellulose, lignin, and hemicellulose.
• Valorization of waste paper into high-value products is crucial for sustainable resource management.
• Direct conversion methods for waste paper components are actively researched.

Purpose of the Study:

• To develop a simple and efficient method for converting waste newspapers into cellulose-based films.
• To investigate the use of ionic liquids as solvents for waste newspaper dissolution.
• To evaluate the properties of the regenerated cellulose-based films.

Main Methods:

• Dissolving waste newspapers in the ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl) under mild conditions.
• Coagulating and drying the dissolved mixture to form cellulose-based films.
• Filtering the newspaper/AmimCl solution to remove inorganic substances before regeneration.

Main Results:

• Waste newspapers were successfully dissolved and regenerated into smooth, compact, semi-transparent cellulose-based films.
• The films exhibited good mechanical properties, with a tensile strength of 80MPa after filtration.
• The ionic liquid facilitated the direct conversion of waste paper into functional materials.

Conclusions:

• Ionic liquid-mediated processing offers a novel and efficient route for high-value utilization of waste newspapers.
• The regenerated cellulose-based films show potential for applications in packaging and wrapping.
• This approach contributes to sustainable waste management and the circular economy.