Improved Mechanical Recycling of Cellulose Fibres and the Co-Production of Nanocellulose: A Biochemical Approach to Textile Waste Management

改进纤维素纤维的机械回收和纳米纤维素的联合生产：纺织废物管理的生化方法

• 批准号: 2905397
• 金额: --
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2905397
• 关键词: Improved; Mechanical; Recycling; Cellulose; Fibres

Abbreviations: SEM: Scanning electron microscopyXRD: X-ray diffractionNCC: Nanocellulose crystalsAbstractWhilst synthetic fibre recycling has been established, the recycling of cotton is still far behind the expected recycling rates (1). Mechanical recycling can help to combat this issue. However, the high frictional actions in mechanical recycling which shorten and degrade the quality of waste fibres, places restrictions on the use of the method (2).Consequently, mechanical recycling can only offer semi-closed loop solutions whereby a small number of waste fibres, with adequate lengths, are combined with virgin fibres to produce new yarns. To maintain the lengths of waste fibres during shredding thereby increasing the number of suitable extracted fibres, the frictional forces must be reduced. This can be achieved by reducing inter-yarn friction within the textile, loosening it and therefore reducing the shredding force.Environmentally friendly cellulase-enzyme treatments have previously been shown to reduce the shear rigidity of fabrics (3) and assist in the refining of pulp by lowering the shredding force (4). These enzymes have also been used to produce high-strength NCCs from cotton waste, however, the current methodologies suffer from low yields (5). This study investigates the feasibility of cellulase as a pre-treatment to mechanical recycling, decreasing the inter-yarn friction of woven cotton fabric and co-producing NCCs that can be used as a reinforcing textile coating. The treatments reduce friction by reducing contact points between fibres and loosening the structure. Keywords: Mechanical recycling, enzymes, textile waste, Nanocellulose, Textile coating, frictional forcesResearch question: Can a cellulase enzyme treatment be used as a pre-treatment to mechanical recycling?Research aims: This project seeks to investigate the effect of enzyme treatments on the inter-yarn friction of woven cotton fabric during mechanical shredding.Objectives:1. To optimize the enzyme treatment to reduce the combing force and inter-yarn friction of cellulose-based textiles.2. To isolate long fibres from mechanical shredding of treated textiles.3. To produce a methodology to extract enzyme produced Nanocellulose crystals (NCCs) from the reaction solution.4. To coat cellulose fibres with enzyme derived NCC and quantify the mechanical properties.Approach: The student will be conducting laboratory work to treat cellulose-based textiles e.g., cotton, lyocell and/or viscose with a cellulase enzyme solution. The textiles will then be characterized using several laboratory techniques, such as XRD and SEM, to understand the effects of enzyme treatment on the structure and morphology of the textile. Changes in the shear properties will also be measured using mechanical tests such as bias extension tests and combing tests. The student will measure the lengths of treated fibres after mechanical shredding to assess the success of the treatments in maintaining fibre lengths.Novel engineering and/or physical sciences content: High-value NCC production integrated into enzyme-assisted mechanical recycling of textile waste.

缩写：SEM：扫描电子显微镜：X射线衍射NCC：纳米纤维素晶体质量是在合成纤维回收的情况下建立的，棉的回收仍然远远落后于预期的回收率（1）。机械回收可以帮助解决这个问题。然而，机械回收中的高摩擦作用缩短和降低废物纤维的质量，对使用该方法的使用受到限制（2）。结果，机械回收只能提供半锁定的循环解决方案，从而提供少量的废物纤维，并具有足够的长度，并配备了具有新的纤维纤维，以生产新的Yarns Yarns。为了在切碎过程中保持废物纤维的长度，从而增加了合适的提取纤维数量，必须减少摩擦力。这可以通过减少纺织品内的野摩擦，松开其并因此减少切碎力来实现这一点。环境友好的纤维素酶 - 酶处理以前已被证明可以降低织物的剪切刚度（3），并通过降低切碎力来帮助纸浆（4）。这些酶也已用于从棉花废物中产生高强度的NCC，但是，当前的方法学的产量低（5）。这项研究调查了纤维素酶作为机械回收的预处理的可行性，减少了编织棉织物的野摩擦和可以用作增强纺织品涂层的共同生产的NCC。治疗方法通过减少纤维之间的接触点并松开结构来减少摩擦。 Keywords: Mechanical recycling, enzymes, textile waste, Nanocellulose, Textile coating, frictional forcesResearch question: Can a cellulase enzyme treatment be used as a pre-treatment to mechanical recycling?Research aims: This project seeks to investigate the effect of enzyme treatments on the inter-yarn friction of woven cotton fabric during mechanical shredding.Objectives:1.为了优化酶处理以减少基于纤维素的纺织品的梳子力和雅之间的摩擦。2。为了将长纤维与处理的纺织品的机械切碎。3。从反应溶液中产生酶产生纳米纤维素晶体（NCC）的方法。4。要用酶衍生的NCC涂层纤维素纤维并量化机械性能。请说：学生将进行实验室工作，以治疗基于纤维素的纺织品，例如棉花，Lyocell和/或使用纤维素酶酶溶液进行处理。然后，将使用多种实验室技术（例如XRD和SEM）来表征纺织品，以了解酶处理对纺织品结构和形态的影响。还将使用机械测试（例如偏置扩展测试和梳理测试）来测量剪切特性的变化。学生将在机械切碎后测量处理过的纤维的长度，以评估处理在维持纤维长度方面的成功。动物工程和/或物理科学含量：高价值NCC产生，整合到酶辅助机械纺织品的机械回收中。