Li Ruilong, Ren Longfang, Chen Liang, Liu Huaqing, Qiang Taotao
National Demonstration Center for Experimental Light Chemistry Engineering Education, College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
National Demonstration Center for Experimental Light Chemistry Engineering Education, College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Int J Biol Macromol. 2024 Mar;261(Pt 2):129922. doi: 10.1016/j.ijbiomac.2024.129922. Epub 2024 Feb 1.
Ecological retanning agent is an effective way to solve the pollution source of leather manufacturing industry. In this study, the gelatin from chrome-containing leather shavings in the leather industry was used to realize sustainable leather post-tanning. The gelatin hydrolysate (GH) coordinated with Zr or Al to prepare eco-friendly retanning agents GH-Zr and GH-Al. The successful coordination between GH and metal ions was characterized by FTIR and XPS. The retanning agents were characterized by FTIR curve-fitting and circular dichroism spectroscopy. The results showed that the conformation of the secondary structure of the polypeptide became ordered and stable after coordinating with the metal ions. The particle size and weight average molecular weight of the retanning agents were ~1700 nm and ~2100, respectively, measured by nanoparticle size analyzer and gel permeation chromatography (GPC). The retanning agents were applied to retanning of chrome tanned leather and glutaraldehyde tanned leather. The abundant free amino from retanning agents can consume the free formaldehyde. Meanwhile, retanning agents can effectively improve the multiple binding sites, resulting in favorable thickening rate (>110 %) and excellent dye and fatliquor absorption rate with ~99.91 % and ~93.18 %. Thus, this strategy can provide a viable choice for solid leather waste and sustainable development of the leather industry.
生态复鞣剂是解决皮革制造业污染源的有效途径。在本研究中，利用皮革工业中含铬皮革屑的明胶实现皮革的可持续复鞣。明胶水解产物（GH）与Zr或Al配位制备环保型复鞣剂GH-Zr和GH-Al。通过FTIR和XPS对GH与金属离子之间的成功配位进行了表征。通过FTIR曲线拟合和圆二色光谱对复鞣剂进行了表征。结果表明，多肽二级结构的构象在与金属离子配位后变得有序且稳定。通过纳米粒度分析仪和凝胶渗透色谱（GPC）测得复鞣剂的粒径和重均分子量分别约为1700 nm和约2100。将复鞣剂应用于铬鞣革和戊二醛鞣革的复鞣。复鞣剂中丰富的游离氨基可以消耗游离甲醛。同时，复鞣剂可以有效地增加多个结合位点，从而获得良好的增厚率（>110%）以及优异的染料和加脂剂吸收率，分别约为99.91%和约93.18%。因此，该策略可为固体皮革废弃物处理及皮革工业的可持续发展提供可行的选择。
