Abstract

Currently, wastewater treatment is one of the most important issues related to the toxic effects of the pathogens and hazardous water pollution impact on human beings, agriculture and animals. In this study, we synthesized reduced graphene oxide/zinc oxide (rGO/ZnO) nanocomposite using a chemical method. The synthesized rGO/ZnO nanocomposite was characterized by XRD, SEM, EDX, FT-IR and UV–Vis spectroscopy. The rGO/ZnO nanocomposite was analyzed for reduction of methylene blue (MB) and 4-nitrophenole (4-NP). The antibacterial activity of GO and rGO/ZnO was also analyzed. The degradation rate of MB under UV lamp by rGO/ZnO nanocomposite was found to be 80% after 5 h. The reduction of 4-NP into 4-aminophenol (4-AP) was completed in 10 min in the absence of reducing agent, whereas in the presence of reducing agent (NaBH₄), the reduction time was reduced to 3 min. Furthermore, rGO/ZnO nanocomposite was also analyzed for anti-bacterial activity on Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli bacterial strains using agar well disk diffusion method. The results of anti-bacterial activity showed that rGO/ZnO nanocomposite exhibits better anti-bacterial activity than GO. This indicated the increased biocompatibility of the rGO/ZnO nanocomposite than GO. It was found that rGO/ZnO nanocomposites has great potential for reduction of 4-NP to 4-AP, shows superior antibacterial activity and can be used for biomedical application.

中文翻译：

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还原氧化石墨烯/氧化锌纳米复合材料：从合成到其在废水净化和抗菌活性中的应用

摘要

当前，废水处理是与病原体的毒性作用和有害水污染对人类，农业和动物的影响有关的最重要问题之一。在这项研究中，我们使用化学方法合成了还原型氧化石墨烯/氧化锌（rGO / ZnO）纳米复合材料。合成的rGO / ZnO纳米复合材料通过XRD，SEM，EDX，FT-IR和UV-Vis光谱进行了表征。分析了rGO / ZnO纳米复合材料的亚甲基蓝（MB）和4-硝基酚（4-NP）还原。还分析了GO和rGO / ZnO的抗菌活性。5h后，rGO / ZnO纳米复合材料在紫外灯下对MB的降解率为80％。在不存在还原剂的情况下，在10分钟内将4-NP还原为4-氨基苯酚（4-AP），而在存在还原剂（NaBH ₄），还原时间减少到3分钟。此外，还使用琼脂孔圆盘扩散法分析了rGO / ZnO纳米复合材料对金黄色葡萄球菌，铜绿假单胞菌和大肠杆菌菌株的抗菌活性。抗菌活性的结果表明，rGO / ZnO纳米复合材料具有比GO更好的抗菌活性。这表明rGO / ZnO纳米复合材料的生物相容性高于GO。发现rGO / ZnO纳米复合材料具有将4-NP还原为4-AP的巨大潜力，显示出优异的抗菌活性，可用于生物医学应用。