废弃黑葵花籽壳绿色制备金纳米粒子及其抗氧化和催化性能

Green Synthesis of Gold Nanoparticles Using Waste Black Sunflower Seed Shell Extract and Evaluation of Antioxidant and Catalytic Activities

采用废弃黑葵花籽壳提取物作为还原剂和保护剂,低成本快速绿色制备金纳米粒子。利用紫外-可见光谱、透射扫描电镜、X射线衍射光谱和傅里叶红外光谱表征所制备的金纳米粒子。结果表明,采用体积分数80%提取物制备的金纳米粒子在波长526 nm处具有特征吸收峰,平均粒径为(7.25±2.24)nm。傅里叶红外光谱和X射线衍射光谱结果表明,提取物中的成分可以在金纳米粒子表面形成保护层。而这层保护剂不仅使得金纳米粒子在不同贮藏时间、温度、pH值和盐浓度的条件下具有较高的稳定性,而且在其清除1,1-二苯基-2-三硝基苯肼自由基过程中展现出了较强的抗氧化活性。此外,在催化还原4-硝基苯酚转变为4-氨基苯酚的反应中,表现出良好的催化活性。鉴于此,此类型金纳米粒子在食品催化、生物医药和工业生产等领域将具有广泛的应用价值。

Herein,we demonstrated a low-cost and eco-friendly method for the synthesis of gold nanoparticles(AuNPs)using waste black sunflower seed shell extract as both a reducing agent and protectant.The as-prepared sample was characterized by UV-vis spectroscopy,scanning electron microscopy(SEM),X-ray diffraction(XRD)and Fourier transform infrared(FTIR)spectroscopy.The results showed that the synthesized AuNPs using 80%(V/V)of waste black sunflower seed shell extract had a characteristic absorption peak at 526 nm in the UV-vis spectrum.The mean particle size of the AuNPs was observed to be(7.25±2.24)nm.The FTIR spectrum and the XRD pattern indicated that the extract could form a protective layer on the AuNPs surface,which conferred the AuNPs not only with high stability toward storage,heat,pH and salt,but also with strong antioxidant activity in scavenging 1,1-diphenyl-2-picrylhydrazyl(DPPH)radical.Furthermore,the AuNPs showed good catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol by excess NaBH4.We proposed that the AuNPs could be a potential catalyst for applications in food,biomedical and biopharmaceutical industries.