--- title: "Upcycling PET Through Artificial Photosynthesis" id: "10940" type: "post" slug: "upcycling-pet-through-artificial-photosynthesis" published_at: "2026-04-13T15:30:20+00:00" modified_at: "2026-04-01T16:44:43+00:00" url: "https://www.plasticsengineering.org/2026/04/upcycling-pet-through-artificial-photosynthesis-010940/" markdown_url: "https://www.plasticsengineering.org/2026/04/upcycling-pet-through-artificial-photosynthesis-010940.md" excerpt: "High-performance photocatalysts can upcycle post-consumer polyester under mild conditions." taxonomy_category: - "Business" - "Circular Economy" - "Editor's Choice Technical Paper" - "Education & Training" - "Food Packaging" - "Industry" - "Materials" - "Packaging" - "People" - "PET" - "Process" - "Recyclate" - "Recycling" - "Resins" - "Strategy" - "Sustainability" - "Trending" taxonomy_post_tag: - "Artificial Photosynthesis" - "Carbon recovery" - "CO2 adsorption" - "green chemistry" - "Heterojunction construction" - "Material Science" - "PET upcycling" - "Photocatalysis" - "Photocatalysis for plastic waste" - "Solar Energy" - "Solar-driven upcycling" - "Sustainability" - "Tandem catalysis" - "Tandem catalytic systems" --- [Home](https://www.plasticsengineering.org/) » [News](https://www.plasticsengineering.org/news/) » [Trending](https://www.plasticsengineering.org/c/trending/) » [Sustainability](https://www.plasticsengineering.org/c/trending/sustainability/) » Upcycling PET Through Artificial Photosynthesis # Upcycling PET Through Artificial Photosynthesis Researchers are harnessing solar energy to convert PET waste into valuable chemicals at low cost.### High-performance photocatalysts can upcycle post-consumer polyester under mild conditions. Photocatalysis is an option for upcycling plastic waste under ambient conditions. Using solar energy, photocatalysts such as CdS, TiO2, and g-C3N4 induce redox reactions in plastic. Through the partial oxidation of plastics, these photocatalysts recover plastic’s carbon resources. This method offers a [cost-effective alternative to traditional waste management](https://iopscience.iop.org/article/10.1088/2752-5724/ae3195/meta#mfae3195s3) , reducing carbon emissions while valorizing waste into high-value compounds. **You can also read:** [Bioinspired Hydrogels in Clean Energy and Hydrogen Generation.](https://www.plasticsengineering.org/2024/11/bioinspired-hydrogels-in-clean-energy-and-hydrogen-generation-007264/) ## Process of Photocatalysis During photocatalysis, solar energy generates electron-hole pairs. Then, charge carriers migrate from the bulk to the photocatalyst surface. Redox reactions then occur on the photocatalyst’s surface. This process generates electrons, which can be used for water splitting or CO2 reduction to produce fuels. In turn, the resulting electron holes have applications in plastic valorization. Photocatalysis has applications in polyester upcycling integrated with water splitting, valorization, and CO2 reduction, as well as in organonitrogen synthesis. Figure courtesy of [Beyond mechanical recycling: artificial photosynthesis enables upcycling of polyester plastic into valuable chemicals.](https://iopscience.iop.org/article/10.1088/2752-5724/ae3195/meta#mfae3195s4) ## Designing for Plastic Conversion When designing photocatalysts, modifying the redox potential can enhance their effectiveness. Methods such as doping engineering and heterojunction constructions can achieve this. - Element doping: This process introduces heteroatoms into the lattice of photocatalysts. This modifies the redox capacity of the photocatalyst by inducing changes in its energy band. [Previous research](https://www.sciencedirect.com/science/article/abs/pii/S1383586625010986) investigated Cu doping of BiOBr, a photocatalyst, through a one-pot solvothermal method. This narrowed the band gap of BiOBr while tuning its redox capacity. - Heterojunction constructions: Constructions such as type-II, Z-scheme, and S-scheme heterojunction are strategies for modifying redox potentials of photocatalysts. Surface modification, lattice strain, and thermal energy can also aid in photocatalyst optimization. Figure courtesy of [Beyond mechanical recycling: artificial photosynthesis enables polyester plastic upcycling into valuable chemicals.](https://iopscience.iop.org/article/10.1088/2752-5724/ae3195/meta#mfae3195s4) ## Artificial Photosynthesis for CO2 Adsorption The overoxidation of polyester plastics generates CO2. Though the overabundance of CO2 leads to environmental issues, it is a crucial carbon resource. Artificial photosynthesis, or photocatalysis, requires sacrificial reagents to consume electron holes, increasing the cost of CO2 disposal. Alternatively, waste polyester can replace those sacrificial reagents during photooxidation. This leads to the conversion of both CO2 and waste polyester into reusable chemicals. Research has shown that oxygen vacancy defect engineering in photocatalysts can enhance CO2 adsorption. Solvent and reaction temperature, as well as other parameters, can also affect the CO2 concentration in solution. ### **Photocatalyst Performance: TiO2 vs. g-C3N4** **Property****Titanium Dioxide (TiO2)****Graphitic Carbon Nitride (g-C3N4)****Band Gap (eV)**~3.2~2.7**Primary Light Absorption**Ultraviolet (UV)Visible Light**Stability**ExcellentExcellent**Main Advantage**Low cost, high abundanceVisible light activation**Main Limitation**Large band gap (requires UV)Moderate recombination rate## Harnessing the Power of Photocatalysis Currently, challenges with photocatalysis limit its practicality for polyester upcycling. For example, only ultraviolet light and a small segment of visible light can induce polyester conversion. Since ultraviolet light makes up only ~5% of solar energy, developing photocatalysts that use near-infrared light is desired. Using simulations and artificial intelligence, researchers can predict how unknown photocatalysts will behave prior to experimentation. Tandem catalytic systems, such as those that combine photocatalysis with electrocatalysis or thermal catalysis, can accelerate reforming of polyester. Introducing biocatalysis can further improve tandem systems. By **[Julienne Smith](https://www.plasticsengineering.org/author/juliennesmith/)** | April 13, 2026 ##### [Julienne Smith](https://www.plasticsengineering.org/author/juliennesmith/) [+ postsBio ⮌](#) - Julienne Smith [Mechanical Recycling of Polyolefins in Food Packaging](https://www.plasticsengineering.org/2026/05/mechanical-recycling-of-polyolefins-in-food-packaging-011336/) - Julienne Smith [Upcycling Polyolefins into Jet Fuel Components](https://www.plasticsengineering.org/2026/04/upcycling-polyolefins-into-jet-fuel-components-011138/) - Julienne Smith [Renewable Functional Coatings for Advanced Applications](https://www.plasticsengineering.org/2026/04/renewable-functional-coatings-for-advanced-applications-011134/) - Julienne Smith [Nanocomposite Films from Car Bumper Waste](https://www.plasticsengineering.org/2026/04/nanocomposite-films-from-car-bumper-waste-011041/) ### Other posts you could read [May 13, 2026The Logistics Challenge of Scaling Mechanical Recycling](https://www.plasticsengineering.org/2026/05/the-logistics-challenge-of-scaling-mechanical-recycling-011251/) [May 18, 2026Packaging Redesign: Why Most Fail and What Drives Success](https://www.plasticsengineering.org/2026/05/packaging-redesign-why-most-fail-and-what-drives-success-011263/) [April 28, 2026IKV Colloquium 2026: The Journey of Research and Industry](https://www.plasticsengineering.org/2026/04/ikv-colloquium-2026-the-journey-of-research-and-industry-010989/) [May 19, 2026Human Chaos: The Design Rebellion Against Algorithmic Perfection](https://www.plasticsengineering.org/2026/05/human-chaos-the-design-rebellion-against-algorithmic-perfection-011268/) [May 1, 2026High-Viscosity Photopolymers Transform Additive Manufacturing](https://www.plasticsengineering.org/2026/05/high-viscosity-photopolymers-transform-additive-manufacturing-011153/) [April 30, 2026Upcycling Polyolefins into Jet Fuel Components](https://www.plasticsengineering.org/2026/04/upcycling-polyolefins-into-jet-fuel-components-011138/) [May 25, 2026Children’s Packaging Design: Balancing Play, Safety, and Trust](https://www.plasticsengineering.org/2026/05/childrens-packaging-design-balancing-play-safety-and-trust-011283/) [May 11, 2026Global Polymer Feedstock Supply Chains Face Rising Disruptions](https://www.plasticsengineering.org/2026/05/global-polymer-feedstock-supply-chains-face-rising-disruptions-011233/) ## Share Your Thoughts [Cancel reply](/2026/04/upcycling-pet-through-artificial-photosynthesis-010940/#respond) - [https://twitter.com/share?url=https://www.plasticsengineering.org/?p=10940&text=Upcycling+PET+Through+Artificial+Photosynthesis&via=Plastics_Mag](https://twitter.com/share?url=https://www.plasticsengineering.org/?p=10940&text=Upcycling+PET+Through+Artificial+Photosynthesis&via=Plastics_Mag) - [https://www.facebook.com/sharer.php?u=https://www.plasticsengineering.org/?p=10940&t=Upcycling+PET+Through+Artificial+Photosynthesis](https://www.facebook.com/sharer.php?u=https://www.plasticsengineering.org/?p=10940&t=Upcycling+PET+Through+Artificial+Photosynthesis) - [https://www.linkedin.com/shareArticle?mini=true&url=https://www.plasticsengineering.org/?p=10940&title=Upcycling%20PET%20Through%20Artificial%20Photosynthesis&summary=High-performance+photocatalysts+can+upcycle+post-consumer+polyester+under+mild+conditions.&source=Plastics+Engineering](https://www.linkedin.com/shareArticle?mini=true&url=https://www.plasticsengineering.org/?p=10940&title=Upcycling%20PET%20Through%20Artificial%20Photosynthesis&summary=High-performance+photocatalysts+can+upcycle+post-consumer+polyester+under+mild+conditions.&source=Plastics+Engineering) - [https://www.reddit.com/submit?url=https://www.plasticsengineering.org/?p=10940&title=Upcycling+PET+Through+Artificial+Photosynthesis](https://www.reddit.com/submit?url=https://www.plasticsengineering.org/?p=10940&title=Upcycling+PET+Through+Artificial+Photosynthesis) - [/cdn-cgi/l/email-protection#4f703c3a2d252a2c3b721f232e3c3b262c3c6f0a212826212a2a3d2621286f626f1a3f2c362c232621286f1f0a1b6f1b273d203a28276f0e3d3b2629262c262e236f1f27203b203c36213b272a3c263c692d202b3672273b3b3f3c756060383838613f232e3c3b262c3c2a212826212a2a3d26212861203d2860703f727e7f767b7f](/cdn-cgi/l/email-protection#4f703c3a2d252a2c3b721f232e3c3b262c3c6f0a212826212a2a3d2621286f626f1a3f2c362c232621286f1f0a1b6f1b273d203a28276f0e3d3b2629262c262e236f1f27203b203c36213b272a3c263c692d202b3672273b3b3f3c756060383838613f232e3c3b262c3c2a212826212a2a3d26212861203d2860703f727e7f767b7f) - [#comments](#comments)