Rahman Khandaker Tanzim, Alam Md Nur-E, Khan M Nuruzzaman
Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering and Technology, University of Dhaka Dhaka 1000 Bangladesh
Institute of Leather Engineering and Technology, University of Dhaka Dhaka 1000 Bangladesh.
RSC Adv. 2025 Apr 17;15(16):12162-12178. doi: 10.1039/d5ra00225g. eCollection 2025 Apr 16.
The advancement of eco-friendly and effective antibacterial outer surfaces for medical textiles and leather products is considered important by industries and end users. Herein, positively charged chitosan (CS) and copper oxide nanoparticle-decorated negatively charged graphene oxide (CuO-GO) were assembled layer-by-layer to create an innovative nanocomposite (CS/CuO-GO) coating onto the leather surface. GO was prepared from graphite powder. Eco-friendly synthesis of CuO nanoparticles with leaf extract was reported and utilized to prepare the CuO-GO nanocomposite. The as-prepared materials were tested through FTIR, XRD, UV-vis spectroscopy, TEM, and DLS analyses. Different amounts of CS/CuO-GO coated leathers showed efficient antibacterial activities against () and () using a "kill-release" approach. This was largely attributed to the cooperative interaction between the contact-killing of the chitosan layer, the discharge of Cu ions, and the bacterial-repelling properties of the anionic GO layer. The FE-SEM analysis confirms the existence of a CuO-GO layer on the leather surface with an effect on the macroscopic level performances. The XPS analysis confirms the chemical state of the coated materials on the leather surface. Tensile, tear, and stitch tear strength increased after coating with the CS/CuO-GO nanocomposite. The WVP of the coated leather remains within the range after coating with different wt% of the CS/CuO-GO nanocomposite. The durability of the nanocomposite coating on leather surfaces was thoroughly examined through dry and wet rub fastness tests. Results clearly showed that the strong coating greatly enhanced the antibacterial effectiveness of leather against mechanical wear. The impacts of CS/CuO-GO nanocomposite coating on the leather surface hydrophilicity were evaluated using water contact angle measurements. Water-borne chitosan-based CuO-GO nanocomposite showed a good eco-friendly leather finishing system. It could extend their applications to sports and medical textiles to impart antibacterial effects.
对于医用纺织品和皮革制品而言，开发环保且有效的抗菌外表面受到了行业和终端用户的重视。在此，将带正电荷的壳聚糖（CS）与负载有氧化铜纳米颗粒的带负电荷的氧化石墨烯（CuO-GO）逐层组装，在皮革表面形成一种创新的纳米复合材料（CS/CuO-GO）涂层。GO由石墨粉制备而成。报道了利用叶提取物对CuO纳米颗粒进行环保合成，并用于制备CuO-GO纳米复合材料。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、紫外可见光谱、透射电子显微镜（TEM）和动态光散射（DLS）分析对所制备的材料进行了测试。不同用量的CS/CuO-GO涂层皮革采用“杀灭-释放”方法对金黄色葡萄球菌和大肠杆菌显示出高效的抗菌活性。这主要归因于壳聚糖层的接触杀灭、铜离子的释放以及阴离子GO层的抗菌性能之间的协同相互作用。场发射扫描电子显微镜（FE-SEM）分析证实了皮革表面存在CuO-GO层，且对宏观性能有影响。X射线光电子能谱（XPS）分析证实了皮革表面涂层材料的化学状态。用CS/CuO-GO纳米复合材料涂层后，拉伸强度、撕裂强度和缝线撕裂强度均有所提高。用不同重量百分比的CS/CuO-GO纳米复合材料涂层后，涂层皮革的水蒸气透过率（WVP）仍在该范围内。通过干、湿摩擦牢度测试对皮革表面纳米复合涂层的耐久性进行了全面研究。结果清楚地表明，牢固的涂层大大提高了皮革对机械磨损的抗菌效果。通过测量水接触角评估了CS/CuO-GO纳米复合涂层对皮革表面亲水性的影响。水性壳聚糖基CuO-GO纳米复合材料显示出良好的环保皮革涂饰体系。它可以扩展到运动和医用纺织品领域以赋予抗菌效果。
