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dc.contributor.authorAttallah, Olivia A.
dc.contributor.authorAzeem, Muhammad
dc.contributor.authorNikolaivits, Efstratios
dc.contributor.authorTopakas, Evangelos
dc.contributor.authorBrennan Fournet, Margaret
dc.identifier.citationAttallah, O.A.; Azeem, M.; Nikolaivits, E.; Topakas, E.; Fournet, M.B. (2022). Progressing ultragreen, energy-efficient biobased depolymerization of poly(ethylene terephthalate) via microwave-assisted green deep eutectic solvent and enzymatic treatment. Polymers. 14, 109. 10.3390/polym14010109en_US
dc.description.abstractEffective interfacing of energy-efficient and biobased technologies presents an all-green route to achieving continuous circular production, utilization, and reproduction of plastics. Here, we show combined ultragreen chemical and biocatalytic depolymerization of polyethylene terephthalate (PET) using deep eutectic solvent (DES)-based low-energy microwave (MW) treatment followed by enzymatic hydrolysis. DESs are emerging as attractive sustainable catalysts due to their low toxicity, biodegradability, and unique biological compatibility. A green DES with triplet composition of choline chloride, glycerol, and urea was selected for PET depolymerization under MW irradiation without the use of additional depolymerization agents. Treatment conditions were studied using Box-Behnken design (BBD) with respect to MW irradiation time, MW power, and volume of DES. Under the optimized conditions of 20 mL DES volume, 260 W MW power, and 3 min MW time, a significant increase in the carbonyl index and PET percentage weight loss was observed. The combined MW-assisted DES depolymerization and enzymatic hydrolysis of the treated PET residue using LCC variant ICCG resulted in a total monomer conversion of ≈16% (w/w) in the form of terephthalic acid, mono-(2-hydroxyethyl) terephthalate, and bis-(2-hydroxyethyl) terephthalate. Such high monomer conversion in comparison to enzymatically hydrolyzed virgin PET (1.56% (w/w)) could be attributed to the recognized depolymerization effect of the selected DES MW treatment process. Hence, MW-assisted DES technology proved itself as an efficient process for boosting the biodepolymerization of PET in an ultrafast and eco-friendly manner.en_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.subjectEnzymatic hydrolysisen_US
dc.subjectDeep eutectic solventsen_US
dc.subjectPolyethylene terephthalateen_US
dc.subjectBox-Behnken designen_US
dc.subjectMicrowave depolymerizationen_US
dc.titleProgressing ultragreen, energy-efficient biobased depolymerization of poly(ethylene terephthalate) via microwave-assisted green deep eutectic solvent and enzymatic treatmenten_US
dc.contributor.affiliationTechnological University of the Shannon Midlands Midwesten_US
dc.contributor.sponsorEuropean Union’s Horizon 2020 research, the Irish Research Council (GOIPG/2021/1739), and innovation program under grant agreement No. 870292 (BIOICEP) and was supported by the National Natural Science Foundation of China (grant numbers: Institute of Microbiology, Chinese Academy of Sciences: 31961133016; Beijing Institute of Technology: 31961133015; Shandong University: 31961133014).en_US
dc.identifier.orcid 0000-0002-9811-1715en_US
dc.subject.departmentMaterials Research Institute TUS:MMen_US

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Attribution-NonCommercial-NoDerivatives 4.0 International
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 International