Carbios, the first and only company to have developed an enzymatic depolymerization process to recycle polyester PET in plastic and textile waste

Two methods for the preparation of high molecular weight [3H]hyaluronic acid were investigated. In the first one, hydrogen atoms in the molecule were replaced by tritium. This isotopic substitution was performed in aqueous solution using Pd/CaCO3 as the catalyst. In the second method, the high molecular weight hyaluronic acid was alkylated with [3H]methyl bromide in liquid ammonia at a temperature of -33.5 °C. High-performance gel permeation chromatographic separation method was used for the isolation and characterization of the high molecular weight [3H]hyaluronic acid. Molecular weight parameters for the labelled biopolymers were Mw = 128 kDa, Mw/Mn = 1.88 (first method) and Mw = 268 kDa, Mw/Mn = 1.55 (second method). The high molecular weight [3H]hyaluronic acid having Mw = 268 kDa was degraded further by specific hyaluronidase. Products of the enzymatic depolymerization were observed to be identical for both, labelled and cold biopolymer. This finding indicates that the described labelling procedure using [3H]methyl bromide does not induce any major structural rearrangements in the molecule.

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Characterization of a textile waste nonwoven fabric reinforced cement composite for non-structural building components

Construction and Building Materials ◽

10.1016/j.conbuildmat.2020.122179 ◽

2021 ◽

Vol 276 ◽

pp. 122179

Author(s):

Payam Sadrolodabaee ◽

Josep Claramunt ◽

Monica Ardanuy ◽

Albert de la Fuente

Keyword(s):

Cement Composite ◽

Nonwoven Fabric ◽

Textile Waste ◽

Reinforced Cement ◽

Building Components

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Pre-treatments of pre-consumer cotton-based textile waste for production of textile fibres in the cold NaOH(aq) and cellulose carbamate processes

Cellulose ◽

10.1007/s10570-021-03753-6 ◽

2021 ◽

Author(s):

Marjo Määttänen ◽

Maria Gunnarsson ◽

Helena Wedin ◽

Sara Stibing ◽

Carina Olsson ◽

...

Keyword(s):

Mechanical Properties ◽

Raw Material ◽

Textile Waste ◽

Future Studies ◽

Degree Of Polymerisation ◽

Textile Fibres ◽

Cellulose Carbamate ◽

Regenerated Fibres ◽

Inorganic Content

AbstractRecycling of textiles is of importance due to the large amount of waste generated from the increasing consumption and use worldwide. Cotton-rich pre-consumer textiles are considered as potential raw material for production of man-made regenerated fibres, but demands purification from the blends with synthetic fibres as well as the dyes and finishing chemicals. In this study we explore the use of different pre-treatments of pre-consumer textiles to meet specific parameters for production of fibres in the cold NaOH(aq) or cellulose carbamate process. The pre-treatments consisted of different bleaching sequences and were performed on both uncoloured and coloured pre-consumer textiles. For the uncoloured textile, degree of polymerisation and amount of inorganic content was efficiently reduced making the material suitable for both the cold NaOH(aq) and the cellulose carbamate process. In case of the coloured textile, the pre-treatments were able to remove the dye and decrease the inorganic content as well as reduce the degree of polymerisation but only sufficiently enough for production of fibres in the cellulose carbamate process. The work was able to prove a fibre-to-fibre concept while further optimisation of the regeneration steps is expected to improve the mechanical properties of the produced fibres in future studies.

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Textile waste as precursors in nanocrystalline cellulose synthesis

Cellulose ◽

10.1007/s10570-021-03982-9 ◽

2021 ◽

Author(s):

Andrielen Braz Vanzetto ◽

Lilian Vanessa Rossa Beltrami ◽

Ademir José Zattera

Keyword(s):

Nanocrystalline Cellulose ◽

Cellulose Synthesis ◽

Textile Waste

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A Textile Waste Fiber-Reinforced Cement Composite: Comparison between Short Random Fiber and Textile Reinforcement

Materials ◽

10.3390/ma14133742 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3742

Author(s):

Payam Sadrolodabaee ◽

Josep Claramunt ◽

Mònica Ardanuy ◽

Albert de la Fuente

Keyword(s):

Construction Material ◽

Drying Shrinkage ◽

Cement Composite ◽

Nonwoven Fabric ◽

Textile Waste ◽

Nonwoven Fabrics ◽

Potential Applications ◽

Reinforced Cement ◽

The One ◽

Garment And Textile

Currently, millions of tons of textile waste from the garment and textile industries are generated worldwide each year. As a promising option in terms of sustainability, textile waste fibers could be used as internal reinforcement of cement-based composites by enhancing ductility and decreasing crack propagation. To this end, two extensive experimental programs were carried out, involving the use of either fractions of short random fibers at 6–10% by weight or nonwoven fabrics in 3–7 laminate layers in the textile waste-reinforcement of cement, and the mechanical and durability properties of the resulting composites were characterized. Flexural resistance in pre- and post-crack, toughness, and stiffness of the resulting composites were assessed in addition to unrestrained drying shrinkage testing. The results obtained from those programs were analyzed and compared to identify the optimal composite and potential applications. Based on the results of experimental analysis, the feasibility of using this textile waste composite as a potential construction material in nonstructural concrete structures such as facade cladding, raised floors, and pavements was confirmed. The optimal composite was proven to be the one reinforced with six layers of nonwoven fabric, with a flexural strength of 15.5 MPa and a toughness of 9.7 kJ/m2.

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