Nanocrystalline cellulose isolated from discarded cigarette filters

Area of Science:

• Materials Science
• Biotechnology
• Environmental Science

Background:

• Discarded cigarette filters (DCF) represent a significant source of waste.
• Cellulose is a versatile biopolymer with numerous applications.
• Developing sustainable methods for cellulose isolation is crucial.

Purpose of the Study:

• To isolate and characterize nanocrystalline cellulose (NCC) from discarded cigarette filters (DCF).
• To explore the potential of using waste materials for valuable bioproduct generation.

Main Methods:

• Cellulose extraction from DCF using ethanolic extraction, hypochlorite bleaching, and alkaline deacetylation.
• Conversion of cellulose to NCC via sulfuric acid hydrolysis.
• Morphological and structural characterization using Transmission Electron Microscopy (TEM), Field Emission Gun Scanning Electron Microscopy (FEGSEM), and Energy-Dispersive X-ray spectroscopy (EDX).

Main Results:

• Needle-like NCC with a mean length of 143nm was isolated.
• FEGSEM confirmed the morphological transition from micro-sized DCF to self-assembled NCC.
• EDX analysis indicated the retention of Titanium dioxide (TiO2) in the NCC.
• Specific surface area of freeze-dried NCC was 7.78m²/g.
• High crystallinity of NCC was observed (96.77% for film, 94.47% for freeze-dried).
• Crystallite sizes correlated with NCC width.

Conclusions:

• Nanocrystalline cellulose (NCC) can be successfully isolated from discarded cigarette filters (DCF).
• The process yields high-purity, high-crystallinity NCC with retained TiO2 nanoparticles.
• This research offers a sustainable route for valorizing cigarette filter waste into advanced nanomaterials.