X射线散射方法对废液封闭循环利用工艺中皮革胶原结构的研究

Studies on collagen structure using X-ray scattering on a closed-loop leather process

在皮革加工过程中控制有害物质的过量使用,减少环境污染和健康隐患对废物管理是至关重要的。为了回收皮革加工中的废液循环再利用,减少废水和废料的排放,开发了一种封闭循环利用工艺。这种加工方法伴随的胶原的结构变化尚待研究,而这有利于理解封闭循环利用及其生产出的皮革性能。在这项研究中,用同步辐射小角X射线散射方法,分析了在封闭循环利用方法的不同阶段中胶原蛋白的结构变化。研究表明,回收废液中的有机成分和铬增加了对胶原纤维基质的填充效果。同时,由铬废液处理过的皮革对X射线的散射强度增强,这归因于废液处理皮革中更高的对铬的吸收率。此外,从角蛋白和脂类对X射线的散射强度变化佐证了废液用于脱毛过程的有效性。此项关于胶原结构的研究结果将支持制革封闭循环利用工艺是更加环境友好并有助于经济可持续发展的加工方法。

Waste management in leather processing is crucial in limiting the excess use of hazardous materials that lead to environmental pollution and health concerns. A closed-loop approach was developed to recycle the spent solutions from leather processing to reduce waste in the effluent. The structural changes of collagen that accompany such processing are yet to be studied and is crucial in understanding the closed-loop process and its subsequent leather properties. In this study, we analyzed the collagen structure at different processing stages across the closed-loop approach using synchrotron small-angle X-ray scattering. An increased filling effect in the collagen matrix was observed and attributed to the residual organic component and chromium species in recycled spent solutions. A high uptake of chromium was also observed from the increased scattering intensity from leathers treated with recycled chrome solution, indicating its efficient use. Additionally, the changes in scattering intensity from keratin and lipids indicated an effective unhairing process. Such findings on collagen structure changes will support the development of more environmentally and economically sustainable processing methods to benefit the leather industry.