Feasibility of the use of different types of enzymatically treated cellulosic fibres for polylactic acid (PLA) recycling. (15th February 2021)

• Record Type: Journal Article
• Authors: Bendourou, Fatima Ezzahra; Suresh, Gayatri; Laadila, Mohamed Amine; Kumar, Pratik; Rouissi, Tarek; Dhillon, Gurpreet S.; Zied, Khiari; Brar, Satinder K.; Galvez, Rosa
• Is Part Of: Waste management. Volume 121(2021)
• Page Start: 237
• Page End: 247
• Publication Date: 2021-02-15
• Subjects: rPLA -- Cellulosic fibres -- Chemical extraction -- Enzyme treatment -- Mechanical tests -- Biodegradation; ABTS 2, 2-Azino bis(3-ethylbenzthiazoline-6-sulfonic acid) -- ANOVA Analysis of Variance -- CMF Cellulosic Microfibres -- DNS 3, 5-Dinitrosalicylic acid -- DS Deinked Sludge -- Fpase Filter Paper cellulase assay -- HF Hemp Fibre -- IU/gds International Unit/gram dry substrate -- MS Mixed Sludge -- PLA Polylactic Acid -- rPLA Recycled Polylactic Acid -- SSF Solid-state fermentation; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2020.11.058
• Languages: English
• ISSNs: 0956-053X

Abstract

Highlights: Enzyme treatment improved adhesion between the reinforcement and the rPLA matrix. Laccase and Cellulase showed an activity of 37.02 ± 5.7 IU/gds and 11.8 ± 0.5 IU/gds. Reinforced biocomposites rPLA with hemp fiber gave the most favourable results. Maximum degradation was seen for rPLA-HF in its mass (1.97%) after 6 months. Abstract: In the present study, the potential use of cellulosic microfibers (CMFs) extracted from hemp fiber (HF) and pulp and paper solid waste (mixed sludge (MS), deinked sludge (DS)) as a reinforcing agent in novel bio composite materials produced from recycled Polylactic acid (rPLA) was investigated. CMFs were extracted and treated using physicochemical method followed by enzymatic treatment with laccase and cellulase. The effects of CMFs concentrations (1.5, 3 and 6% w/w) and fiber size (75 μm–1.7 mm) on the mechanical properties (impact and tensile) and biodegradability of the biocomposite samples were investigated. A modified interfacial adhesion between rPLA matrix and the three fibers used, was clearly observed through mechanical tests due to alkali and enzymatic treatments. The use of different types of enzymatically treated cellulosic fibers for polylactic acid (PLA) recycling was assessed by Scaning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The combined physicochemical and enzymatic treatments led to a considerable size reduction of the cellulosic fibers (HF, MS and DS) resulting in the enhanced interfacial adhesion between rPLA matrix and fibers. The biocomposite obtained with rPLA with HF gave the most favorable values for Young's modulus (324.53 ± 3.10 MPa, p -value 0.03), impact strength (27.61 ± 2.94 kJ/m 2, p -value 0.01) and biodegradation rate (1.97%).