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Yoshioka Lab
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The lab uses chemistry to turn plastics back into resources and keep materials in circulation.
AboutAbout the lab
Working toward a resource- and material-circulating society.
The Yoshioka Lab studies recycling processes that return plastics and biomass to usable resources.
The lab develops methods to convert plastics into chemical feedstocks by pyrolysis, and to recirculate halogens from plastics containing chlorine and bromine.
It also works on technologies for environmental remediation, research on the mechanisms by which polymers degrade, and analytical and evaluation methods that support the development of recycling processes.
In collaboration with many universities and companies in Japan and abroad, the lab aims to build new recycling and carbon-circulation systems.
Key terms
- Chemical recycling
- A recycling method that breaks waste down through chemical reactions and recovers chemicals that can be used as raw materials for other products
- Pyrolysis
- Heating a material with little or no oxygen to break it down into smaller molecules
- Halogens
- A group of elements that includes fluorine, chlorine, and bromine. They are found in materials such as polyvinyl chloride resin and flame-retardant additives
NewsLab news
Associate Professor Kumagai receives the Award for Outstanding International Paper Authors from the Japan Society of Material Cycles and Waste Management
A master's student wins the Excellent Poster Award at the Michinoku Analytical Chemistry Symposium
Associate Professor Kumagai receives the Encouragement Award (Chiyoda Corporation Award) from the Japan Petroleum Institute
A master's student wins the Excellent Presentation Award at the Tohoku Branch meeting of the Japan Society of Material Cycles and Waste Management
A doctoral student wins the Best Presentation Award at PYROASIA 2025
ResearchResearch themes
The lab develops chemical recycling processes to create a carbon cycle centered on plastics and biomass. It also studies environmental remediation technologies, the mechanisms of polymer degradation, and analytical and evaluation methods that support the development of chemical processes.
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MembersFaculty
The Yoshioka Lab consists of faculty members, researchers, secretaries, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorToshiaki Yoshioka
- ProfessorYuko Saito
- Associate ProfessorShogo Kumagai
- Assistant ProfessorSiqin Gaowa
- Assistant ProfessorPhanthong Patchiya
- Project Assistant ProfessorZhuze Shao
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “FLAKES” TOP PLASTIC / CC BY-SA 4.0 (cropped)
- Chemical recycling of polymer waste: “Electric guide 3×2.5 mm” Petar Milošević / CC BY-SA 4.0 (cropped)
- Related lab (笘居研究室): “Critical carbon dioxide-3” Bernhard Kuemel、Regi51 / CC BY-SA 2.0 at (cropped)
- Related lab (福島研究室): “Ultramar1 (cropped a lot)” Cephas / CC BY-SA 3.0 (cropped)
- Related lab (渡邉研究室
（システム開発部） ): “Zinc hydroxycarbonate jungle” Arskatin / CC BY 4.0 (cropped) - Related lab (殷研究室): “Such different zinc oxide - nanowalls” Andrey P. Tarasov / CC BY 4.0 (cropped)
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