Ecofriendly Degradation of PET via Neutral Hydrolysis: Degradation Mechanism and Green Chemistry Metrics DOI Open Access
Adhithiya Venkatachalapati Thulasiraman, Arun K. Vuppaladadiyam, Ibrahim Gbolahan Hakeem

et al.

Environments, Journal Year: 2025, Volume and Issue: 12(4), P. 127 - 127

Published: April 18, 2025

Waste polyethylene terephthalate (PET) bottles represent 12% of global plastic waste; however, only 9% are recycled. Hydrothermal processing presents the opportunity to upcycle waste PET into its monomers, particularly, terephthalic acid (TPA). In this study, post-consumer sparkling water were neutrally hydrolysed via a hydrothermal process operating within temperature range 220–270 °C, residence time 30–90 min, and autogenous pressure 25–90 bar. Under these conditions, TPA yield varied between 7.34 81.05%, maximum was obtained at 250 90 40 The had more profound impact on conversion than time. values environmental factor (EF) found be 0.017–0.106, which comparable those bulk chemicals (EF < 1). With chosen energy (EEI) production estimated 5.29 × 104 °C min. findings demonstrate that neutral hydrolysis is feasible approach for converting polymers monomers under mild conditions. addition, GCMS analysis aqueous-phase product revealed notable increase in secondary degradation products TPA, such as benzoic acid, rising from 66.4% 75.7% increased 220 270 °C. mechanisms decarboxylation, dehydration, oxidation. dominant mechanism decarboxylation reaction.

Language: Английский

Isolated iridium oxide sites on modified carbon nitride for photoreforming of plastic derivatives DOI Creative Commons
Pawan Kumar,

Hongguang Zhang,

Asfaw G. Yohannes

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 24, 2025

The rising concentration of plastics due to extensive disposal and inefficient recycling plastic waste poses an imminent critical threat the environment ecological systems. Photocatalytic reforming derivatives value-added chemicals under ambient conditions proceeds at lower oxidation potential which galvanizes hydrogen evolution. We report synthesis a narrow band gap NCN-functionalized O-bridged carbon nitride (MC) through condensation polymerization hydrogen-bonded melem (M)-cyameluric acid (C) macromolecular aggregate. MC scaffold hosts well-dispersed Ir single atom (MCIrSA) sites catalyze oxidative photoreforming alkali-treated polylactic (PLA) polyethylene terephthalate (PET) produce H2 rate 147.5 29.58 μmol g−1cat h−1 AM1.5G irradiation. Solid-state electron paramagnetic resonance (EPR) time-resolved photoluminescence (TRPL) reveals efficient charge carrier generation separation in MCIrSA. X-ray absorption spectroscopy (XAS) Bader analysis reveal undercoordinated IrN2O2 SA pinned C6N7 moieties leading hole quenching. liquid phase EPR, situ FTIR density functional theory (DFT) studies validate facile •OH radicals evolution O-Ir-OH transient species with weak Ir--OH desorption energy barrier. photocatalytic into offers promising strategy address environmental challenges while providing significant benefits. Here, authors develop modified enhanced visible light absorption, effectively anchoring under-coordinated persistent derivatives.

Language: Английский

Citations

0
Upcycling of Waste Plastics into Value-Added Chemicals DOI Creative Commons
Xu Jin, Jing Zhang

Science for energy and environment., Journal Year: 2025, Volume and Issue: unknown, P. 4 - 4

Published: March 27, 2025

Review Upcycling of Waste Plastics into Value-Added Chemicals Jin Xu and Jing Zhang * State Key Laboratory Chemical Engineering, East China University Science Technology, 130 Meilong Road, Shanghai 200237, Correspondence: [email protected] Received: 8 November 2024; Revised: 22 January 2025; Accepted: 24 March Published: 27 2025 Abstract: The rapid increase in plastic production has led to a severe waste crisis, driving the development various recycling technologies mitigate this growing issue. However, these often encounter substantial economic environmental challenges their implementation. An increasingly attractive alternative is chemical upcycling, which can transform plastics value-added chemicals. This review systematically examines upcycling applicable major commercial plastics, including polyethylene terephthalate (PET), polyolefins, polystyrene (PS), polyvinyl chloride (PVC). We focus on key strategies such as solvolysis, catalytic pyrolysis, hydrocracking hydrogenolysis, along with some emerging approaches electrocatalysis photooxidation, aiming summarize trends plastics.

Language: Английский

Citations

0
Organometal catalyst promoted Mechano-chemical depolymerization of post-consumer Polyethylene terephthalate to non-ortho phthalate plasticizer for PVC flexibility DOI

Naresh Kathula,

Mekala Lokesh,

M. Sam Mannan

et al.

Sustainable Chemistry and Pharmacy, Journal Year: 2025, Volume and Issue: 45, P. 102000 - 102000

Published: March 27, 2025

Language: Английский

Citations

0
Catalytic alkaline hydrolysis of PET and BPA-PC waste in minutes at atmospheric pressure without microwaves or organic solvents DOI Creative Commons
Anshul Jain, Stephen J. Connon

Green Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Rapid alkaline hydrolysis of PET, BPA-PC and mixtures both is possible in minutes at atmospheric pressure through the combination solute-derived boiling point elevation phase transfer catalysis without requiring microwaves or cosolvents.

Language: Английский

Citations

0
Ecofriendly Degradation of PET via Neutral Hydrolysis: Degradation Mechanism and Green Chemistry Metrics DOI Open Access
Adhithiya Venkatachalapati Thulasiraman, Arun K. Vuppaladadiyam, Ibrahim Gbolahan Hakeem

et al.

Environments, Journal Year: 2025, Volume and Issue: 12(4), P. 127 - 127

Published: April 18, 2025

Waste polyethylene terephthalate (PET) bottles represent 12% of global plastic waste; however, only 9% are recycled. Hydrothermal processing presents the opportunity to upcycle waste PET into its monomers, particularly, terephthalic acid (TPA). In this study, post-consumer sparkling water were neutrally hydrolysed via a hydrothermal process operating within temperature range 220–270 °C, residence time 30–90 min, and autogenous pressure 25–90 bar. Under these conditions, TPA yield varied between 7.34 81.05%, maximum was obtained at 250 90 40 The had more profound impact on conversion than time. values environmental factor (EF) found be 0.017–0.106, which comparable those bulk chemicals (EF < 1). With chosen energy (EEI) production estimated 5.29 × 104 °C min. findings demonstrate that neutral hydrolysis is feasible approach for converting polymers monomers under mild conditions. addition, GCMS analysis aqueous-phase product revealed notable increase in secondary degradation products TPA, such as benzoic acid, rising from 66.4% 75.7% increased 220 270 °C. mechanisms decarboxylation, dehydration, oxidation. dominant mechanism decarboxylation reaction.

Language: Английский

Citations

0