Biodegradable Smart Materials for Sustainable Environmental Management: A Review

The growing environmental concerns associated with non-degradable materials and increasing pollution have accelerated the development of advanced functional materials that are both sustainable and intelligent. This review focuses on biodegradable smart materials as an emerging class of environmentally responsive systems designed for sustainable environmental management. These materials combine the inherent degradability of biopolymers with smart functionalities such as sensitivity to external stimuli such as temperature, pH, moisture, light, and chemical environments. The paper provides a comprehensive overview of various biodegradable polymers, including natural polymers (starch, cellulose, chitosan) and synthetic biodegradable polymers such as polylactic acid (PLA), polyhydroxyalkanoates (PHA), and their nanocomposites. Special emphasis is given to the design, synthesis, and characterization of smart biodegradable systems, including hydrogels, nanocellulose-based materials, and bio-based composites, which exhibit adaptive and self-responsive behavior. The integration of nanotechnology and green chemistry approaches has significantly improved the performance, efficiency, and applicability of these materials. Despite promising advancements, challenges such as mechanical limitations, cost-effectiveness, large-scale production, and controlled degradation mechanisms remain key concerns. This review highlights recent progress, identifies research gaps, and suggests future directions for the development of high-performance biodegradable smart materials aligned with circular economy principles and sustainable development goals.