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Nontoxic Cross-Linked Graphitic Carbon Nitride-Alginate-Based Biodegradable Transparent Films for UV and High-Energy
M Mehedi Hasan1, Md Sajib Hossain2, Md Didarul Islam2
1Applied Chemistry and Chemical Engineering, Bangabandhu Sheikh Mujibur Rahman Science and Technology University, Gopalganj 8100, Bangladesh.
ACS Applied Materials & Interfaces
|June 22, 2023
Summary
Biodegradable alginate films were enhanced with graphitic carbon nitride (g-C3N4) to effectively block UV and high-energy blue light (HEBL). These sustainable composite films offer excellent shielding and durability while remaining flexible and transparent.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Growing demand for sustainable materials necessitates flexible, transparent, and biodegradable films.
- Alginate biopolymers offer excellent film-forming properties but lack sufficient UV and high-energy blue light (HEBL) blocking capabilities.
- Existing UV/HEBL blocking materials often lack biodegradability or flexibility.
Purpose of the Study:
- To develop enhanced alginate-based films with improved UV and HEBL shielding properties.
- To investigate the synergistic effects of incorporating graphitic carbon nitride (g-C3N4) into alginate films.
- To assess the biodegradability, mechanical stability, and optical properties of the resulting composite films.
Main Methods:
- Fabrication of alginate/g-C3N4 composite films.
- Characterization using ATR-FTIR, TGA, DTG, and FE-SEM to confirm composite formation and properties.
- UV-visible transmittance spectroscopy to evaluate light shielding performance.
- Mechanical testing and biodegradation assessment over 6 months.
Main Results:
- Successful formation of alginate/g-C3N4 composite films via hydrogen bonding, exhibiting synergistic properties.
- Enhanced mechanical and thermal stability while maintaining film flexibility.
- Demonstrated high transparency in the visible region with significant blocking of UV (90%) and HEBL (95%) radiation using only 2 wt% g-C3N4.
- Facilitated biodegradation process and excellent UV/HEBL shielding with mechanical durability maintained after 6 months.
Conclusions:
- Alginate/g-C3N4 composite films offer a promising solution for sustainable UV and HEBL shielding applications.
- The incorporation of g-C3N4 significantly enhances the protective properties and durability of alginate films.
- These materials meet the demand for environmentally friendly, high-performance optical shielding solutions.
