Department of Chemistry, Faculty of Physics and Chemistry, Alzahra University, Tehran, P.O. Box, 1993893973, Iran; School of Chemistry, College of Science, University of Tehran, Tehran, Iran.
Department of Chemistry, Faculty of Physics and Chemistry, Alzahra University, Tehran, P.O. Box, 1993893973, Iran.
Chemosphere. 2022 Jul;299:134436. doi: 10.1016/j.chemosphere.2022.134436. Epub 2022 Mar 28.
The treatment of water contaminated by bacteria is becoming a necessity. The nanomaterials possessing both intrinsic antibacterial properties and photocatalytic activity are excellent candidates for water disinfection. The powdered form of nanomaterials can be aggregated while embedding the nanomaterials into the NFs can overcome the limitation and enhance the photocatalytic activity and transition from UV-light to visiblelight. Here, graphene oxide (GO) was synthesized, grafted to chitosan, and decorated with silver nanoparticles (Ag NPs) to produce Ag-decorated reduced GO-graft-Chitosan (AGC) NPs. The blends of polyacrylonitrile (PAN) and AGC NPs were prepared in various concentrations of 0.5 wt%, 1.0 wt%, 5.0 wt%, and 10.0 wt% and used to fabricate the electrospun composite NFs. FTIR/ATR, UV-Vis, Raman, XRD, and SEM/EDAX analyses confirmed the successful preparation of the NPs and NFs. The cytotoxicity and antibacterial activity of the composite NFs were received in the order of composite NFs 10.0 wt%˃ 5.0 wt%˃ 1.0 wt%˃ 0.5 wt% in both conditions with/without light irradiation. Their cytotoxicity and antibacterial activity were more under light irradiation compared to the dark. The composite NFs (5.0 wt%) were distinguished as the optimum NFs with cell viability of 80% within 24 h and 60% within 48 h on L929 cells and inhibition zone diameter (IZD) of 12 mm for E. coli and 13 mm for S. aureus after 24 h under the light irradiation. The optimum composite NFs showed thermal stability up to 180 °C and tensile strength of 1.11 MPa with 21.71% elongation at break.
受细菌污染的水的处理正成为一种必要。具有固有抗菌性能和光催化活性的纳米材料是水消毒的理想候选材料。纳米材料的粉末形式在嵌入纳米纤维时可能会聚集，而将纳米材料嵌入纳米纤维中可以克服这一限制，提高光催化活性，并将光从紫外光转换为可见光。在这里，合成了氧化石墨烯（GO），接枝到壳聚糖上，并装饰了银纳米粒子（Ag NPs），得到了Ag 修饰的还原 GO-接枝壳聚糖（AGC）纳米粒子。聚丙烯腈（PAN）和 AGC 纳米粒子的混合物以 0.5 wt%、1.0 wt%、5.0 wt%和 10.0 wt%的不同浓度制备，并用于制备电纺复合纳米纤维。FTIR/ATR、UV-Vis、Raman、XRD 和 SEM/EDAX 分析证实了 NPs 和 NFs 的成功制备。在有/没有光照的情况下，复合纳米纤维的细胞毒性和抗菌活性顺序为复合纳米纤维 10.0 wt%＞5.0 wt%＞1.0 wt%＞0.5 wt%。在光照下，它们的细胞毒性和抗菌活性比黑暗中更强。复合纳米纤维（5.0 wt%）在光照下对 L929 细胞 24 h 的细胞存活率为 80%，48 h 为 60%，对大肠杆菌的抑菌圈直径（IZD）为 12mm，对金黄色葡萄球菌的 IZD 为 13mm，表现出最佳的纳米纤维。最佳复合纳米纤维在 180°C 下表现出热稳定性，拉伸强度为 1.11 MPa，断裂伸长率为 21.71%。
