Catalytic Degradation of Polylactic Acid over Al2O3@SiO2 Core-Shell Catalysts

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dc.contributor.authorAkti, Filiz
dc.date.accessioned2021-11-01T15:05:29Z
dc.date.available2021-11-01T15:05:29Z
dc.date.issued2021
dc.department[Belirlenecek]
dc.description.abstractAl2O3@SiO2 core-shell catalysts were synthesized by sol-gel method. The core size'control was provided by using of polyethylene glycol (PEG) and glycerol. The shell thickness was optimized by using the different amount of tetraethylorthosilicate (TEOS). The formation of core and shell structures in catalysts was seen in high resolution transmission electron microscopy (HRTEM) images. In some catalysts, the use of PEG caused to formation of a more monodisperse core structure. The particle size of catalysts was observed in the range of 8-12 nm. The BET (Brunauer-Emmett-Teller) surface area and total pore volume of catalysts ranged 440-1014 m(2)/g and 1.28-2.57 cm(3)/g, respectively. In addition, pore diameter reached up to 25 nm. The use of PEG and glycerol improved textural properties. While BET surface area and total pore volume values decreased by the increase of TEOS amount, shell thickness increased a little. Fourier transform infrared (FTIR) spectrums of the pyridine adsorbed catalysts revealed the presence of Lewis and Bronsted acid sites in the catalysts. The catalysts were tested in the degradation of polylactic acid (PLA) by using thermogravimetric analysis (TGA) technique. TGA results showed the degradation temperature of PLA decreased from 353 to 321 degrees C in the presence of catalysts. Activation energy values were calculated using Flynn-Wall-Ozawa method. The activation energy was reduced from 337 to 199 kJ/mol. Pore structure, particle size and acidity of catalysts significantly affected the degradation performance.
dc.description.sponsorshipScientific Research Project Department of Hitit University [MUH19001.19.009]en_US
dc.description.sponsorshipThis work was supported by the Scientific Research Project Department of Hitit University (MUH19001.19.009).en_US
dc.identifier.doi10.1007/s10924-020-02041-x
dc.identifier.endpage2247en_US
dc.identifier.issn1566-2543
dc.identifier.issn1572-8919
dc.identifier.issue7en_US
dc.identifier.scopus2-s2.0-85100114241
dc.identifier.scopusqualityQ1
dc.identifier.startpage2236en_US
dc.identifier.urihttps://doi.org/10.1007/s10924-020-02041-x
dc.identifier.urihttps://hdl.handle.net/11491/7299
dc.identifier.volume29en_US
dc.identifier.wosWOS:000607967200002
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[Belirlenecek]
dc.language.isoen
dc.publisherSpringer
dc.relation.ispartofJournal Of Polymers And The Environment
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectAl2O3@SiO2en_US
dc.subjectCore-shell catalysten_US
dc.subjectSize control agenten_US
dc.subjectPolylactic aciden_US
dc.subjectDegradationen_US
dc.titleCatalytic Degradation of Polylactic Acid over Al2O3@SiO2 Core-Shell Catalysts
dc.typeArticle

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