Journal article Open Access
Rendering bio-inert low-density polyethylene amenable for biodegradation via fast high throughput reactive extrusion assisted oxidation
Pablo Ferrero; Olivia A. Attallah; Miguel Ángel Valera; Ivana Aleksic; Muhammad Azeem; Jasmina Nikodinovic-Runic; Margaret Brennan Fournet
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<dct:title>Rendering bio-inert low-density polyethylene amenable for biodegradation via fast high throughput reactive extrusion assisted oxidation</dct:title>
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<dct:description><p>An energy efficient high throughput pre-treatment of low density polyethylene (LDPE) using a fast reactive extrusion (REX) assisted oxidation technique followed by bacterial attachment as an indicator for bio-amenability was studied. Silicon dioxide (SiO<sub>2</sub>) was selected as a model oxidizing and catalytic reagent with the REX process demonstrated to be effective both in the presence and absence of the catalyst. Optimized 5-minute duration pretreatment conditions were determined using Box-Behnken design (BBD) with respect to screws speed, operating temperature, and concentration of SiO<sub>2</sub>. The crystallinity index, carbonyl index and weight loss (%) of LDPE were used as the studied responses for BDD. FTIR and DSC spectra of the residual LDPE obtained after pretreatment with the REX assisted oxidation technique showed a significant increase in residual LDPE carbonyl index from 0 to 1.04 and a decrease of LDPE crystallinity index from 29% to 18%. Up to 5-fold molecular weight reductions were also demonstrated using GPC. Optimum LDPE pretreatment with a duration of 5 minutes was obtained at low screw speed (50 rpm), operating temperature of 380-390⁰C and variable concentration of SiO<sub>2</sub>&nbsp;(0 and 2% (w/w)) indicating that effective pretreatment can occur under noncatalytic and catalysed conditions. Biofilms were successfully formed on pretreated LDPE samples after 14 days of incubation.</p> <p>Furthermore, the technique proposed in this study is expected to provide a high throughput approach for pretreatment of pervasive recalcitrant PE based plastics to reduce their bio inertness.</p></dct:description>
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<dct:title>Bio Innovation of a Circular Economy for Plastics</dct:title>
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Indexed in
- Publication date:
- November 1, 2021
- DOI:
-
- Grants:
-
European Commission:
- BioICEP - Bio Innovation of a Circular Economy for Plastics (870292)
- License (for files):
- Creative Commons Attribution 4.0 International