State Key Laboratory of Chemical Resource Engineering, School of Science, Beijing University of Chemical Technology, Beijing 100029, PR China.
State Key Laboratory of Chemical Resource Engineering, School of Science, Beijing University of Chemical Technology, Beijing 100029, PR China.
J Photochem Photobiol B. 2018 Jun;183:349-356. doi: 10.1016/j.jphotobiol.2018.05.006. Epub 2018 May 9.
A "green route" to fabricate nanoparticles has emerged as a revolutionary approach. The reported work presents a green approach to synthesize ZnO nanoparticles using Conyza canadensis plant leaves extract. The synthesis of ZnO was conducted at two different temperatures i.e. 30 °C and 80 °C. ZnO nanoparticles prepared at 80 °C were smaller in size and exhibited spherical morphology. The prepared nanomaterials were examined for the reduction of organic dyes i.e. methylene blue and methyl orange. The fabricated ZnO nanoparticles synthesized at 80 °C were found to be highly active for the reduction of aforementioned dyes with 94.5% reduction of MO and 85.3% reduction of MB in 45 min and 20 min respectively. The rate constant (k) for this reduction of MO was found to be 5.781 × 10 s in the absence of a catalyst and 5.843 × 10 s in the presence of ZnO NPs catalyst. The rate constant (k) for the reduction of MB was found to be 4.7 × 10 s in the absence of a catalyst and 9.936 × 10 s in the presence of ZnO NPs catalyst. ZnO nanoparticles synthesized at 80 °C were examined for their antibacterial activity. The biogenic ZnO nanoparticles exhibited strong antibacterial activity against E. coli and S. aureus with a zone of inhibition (16 mm) and (14 mm) respectively. This high antibacterial and catalytic activity of biogenic ZnO nanoparticles can be attributed to its small size, good dispersion, and well-defined morphology.
一种“绿色路线”来制造纳米粒子已经成为一种革命性的方法。报道的工作提出了一种使用加拿大苍耳植物叶提取物合成氧化锌纳米粒子的绿色方法。在 30°C 和 80°C 两个不同温度下进行了 ZnO 的合成。在 80°C 下制备的 ZnO 纳米粒子尺寸较小，呈球形形态。对所制备的纳米材料进行了有机染料即亚甲基蓝和甲基橙的还原研究。发现 80°C 下制备的 ZnO 纳米粒子对上述染料的还原具有很高的活性，MO 的还原率为 94.5%，MB 的还原率为 85.3%，分别在 45 分钟和 20 分钟内完成。在没有催化剂的情况下，MO 还原的速率常数（k）为 5.781×10s，而在 ZnO NPs 催化剂存在的情况下，k 值为 5.843×10s。在没有催化剂的情况下，MB 还原的速率常数（k）为 4.7×10s，而在 ZnO NPs 催化剂存在的情况下，k 值为 9.936×10s。还研究了在 80°C 下合成的 ZnO 纳米粒子的抗菌活性。生物合成的 ZnO 纳米粒子对大肠杆菌和金黄色葡萄球菌表现出强烈的抗菌活性，抑菌圈分别为 16mm 和 14mm。生物合成的 ZnO 纳米粒子具有高抗菌和催化活性，这可归因于其小尺寸、良好的分散性和明确的形态。
