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Development of an inter-confirmatory plastic characterization system using spectroscopic techniques for waste
U K Adarsh1, E Bhoje Gowd2, Aseefhali Bankapur3
1Department of Atomic and Molecular Physics, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India.
Waste Management (New York, N.Y.)
|July 30, 2022
Summary
A novel dual-spectroscopy sensor combining laser-induced breakdown spectroscopy (LIBS) and Raman spectroscopy offers a compact, cost-effective solution for accurate plastic waste sorting. This advanced sensor rapidly characterizes various plastics, showing promise for industrial recycling applications.
Area of Science:
- Materials Science
- Analytical Chemistry
- Environmental Science
Background:
- Escalating plastic waste poses significant environmental and public health risks.
- Accurate waste sorting is crucial for effective industrial plastic recycling.
- Current sorting methods may lack the precision needed for diverse plastic types.
Purpose of the Study:
- To develop and evaluate a multi-modal spectroscopic sensor for plastic characterization.
- To combine Laser-Induced Breakdown Spectroscopy (LIBS) and Raman spectroscopy for elemental and molecular analysis.
- To assess the sensor's performance in identifying industrially relevant plastics for recycling.
Main Methods:
- A compact, cost-effective optical platform integrating LIBS and Raman spectroscopy was designed.
- The sensor was tested on standard plastic classes: Polypropylene (PP), Polycarbonate (PC), Polylactic Acid (PLA), Nylon-11, and Polymethyl Methacrylate (PMMA).
- Real-world plastic samples (PET, HDPE, PP) under varying conditions were analyzed, with signal acquisition under 30 ms.
Main Results:
- The dual-spectroscopy sensor successfully classified key industrial plastic types.
- Performance was evaluated on diverse plastics, including those in challenging chemical-physical states.
- The system demonstrated rapid analysis, crucial for high-throughput industrial sorting.
Conclusions:
- The developed multi-modal sensor shows significant potential for industrial plastic waste sorting.
- Combining LIBS and Raman spectroscopy enhances plastic characterization accuracy.
- This technology offers a promising pathway towards more efficient and effective plastic recycling.
