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Electromagnetic Radiation-Driven Plastic Degradation and Energy Recovery for Sustainable Waste Management
Summary
Researchers developed a non-thermal UVC photodegradation system that cleaves over 80% of carbon bonds in common plastics within 30 minutes while simultaneously harvesting 15 watts of electrical energy via thermoelectric and photoelectric converters, keeping microplastic and VOC emissions well below safety thresholds at a throughput scalable to 5 kg/hour.
The persistent accumulation of plastic waste presents a severe global environmental challenge. This study presents a non-thermal photodegradation and energy-recovery system that selectively cleaves 82 ± 5% of C–C/C–H bonds in polyethene (PE), polypropylene (PP), and polystyrene (PS) within 30 min of UVC (254 nm) exposure. The bond-dissociation energy is harvested via thermoelectric generators (TEGs), delivering 10 W, and via photoelectric cells, yielding 5 W (10 mA.cm- ² at φ < 2 eV), for a combined recovery of 15 W. Emissions are held below 0.5 ppm VOCs and 0.1 mg.m- ³ microplastics. A lab-scale prototype processes 0.5 kg.h-1 of mixed plastic per 0.1 m² reaction area equivalent to 30 Wh.kg-1 of electrical energy and is scalable to 5 kg.h-1 in a pilot module. Real-time FTIR, Raman, and UV-VIS spectroscopy, integrated with an IoT-PID feedback loop, ensures autonomous optimization. Life-cycle assessment indicates a 25% reduction in greenhouse gas emissions compared to conventional recycling methods. A circular-economy framework envisions recovering oligomeric and monomeric fragments for direct reintegration into polymer production. Feature work will implement digital-twin simulations to refine process control, maximize throughput, and ensure long-term system reliability.