催化学报 ›› 2018, Vol. 39 ›› Issue (1): 109-117.DOI: 10.1016/S1872-2067(17)62915-2

• 论文 • 上一篇    下一篇

采用积雪草树叶提取物生物合成二氧化镁纳米粒子负载的铜纳米颗粒用于高效催化还原有机染料和芳香硝基化合物

Mahmoud Nasrollahzadeha,b, Mohaddeseh Sajjadia, S. Mohammad Sajadic   

  1. a 库姆大学理学院化学系, 库姆, 伊朗;
    b 库姆大学环境研究中心, 库姆, 伊朗;
    c 索伦大学科学研究中心, 索伦, 伊拉克
  • 收稿日期:2017-08-21 修回日期:2017-10-08 出版日期:2018-01-18 发布日期:2018-01-19
  • 通讯作者: Mahmoud Nasrollahzadeh

Biosynthesis of copper nanoparticles supported on manganese dioxide nanoparticles using Centella asiatica L. leaf extract for the efficient catalytic reduction of organic dyes and nitroarenes

Mahmoud Nasrollahzadeha,b, Mohaddeseh Sajjadia, S. Mohammad Sajadic   

  1. a Department of Chemistry, Faculty of Science, University of Qom, Qom 37185-359, Iran;
    b Center of Environmental Researches, University of Qom, Qom, Iran;
    c Scientific Research Center, Soran University, PO Box 624, Soran, Kurdistan Regional Government, Iraq
  • Received:2017-08-21 Revised:2017-10-08 Online:2018-01-18 Published:2018-01-19
  • Contact: 10.1016/S1872-2067(17)62915-2

摘要:

本文设计了一个经济、绿色的新型方法,采用积雪草树叶提取物作为自然的还原剂,在不使用稳定剂或表面活性剂的情况下合成了MnO2纳米粒子负载的Cu纳米颗粒(Cu NPs).该合成过程环境友好,且避免使用有毒的还原剂.树叶提取物中的酚羟基将溶液中的Cu2+还原为Cu NPs,后者再稳定在MnO2 NPs表面.采用X射线衍射、透射电镜、场发射扫描电镜、能量散射谱和红外光谱对所得Cu/MnO2纳米复合物进行了表征.结果表明,该材料可用作高活性、高效可重复使用的多相催化剂,用于室温水溶液NaBH4存在下刚果红、罗丹明B和亚甲基蓝,以及硝基化合物,如2,4二硝基苯肼和4-硝基苯酚的催化还原.Cu/MnO2纳米复合物的高稳定性可使其被分离出来,重复使用数次而活性无明显下降.

关键词: 生物合成, 积雪草, Cu/MnO2纳米复合物, 还原, 芳香硝基化合物, 有机染料

Abstract:

In this study we designed a novel, cost-efficient and green method for the synthesis of copper nanoparticles (Cu NPs) supported on manganese dioxide (MnO2) NPs, using Centella asiatica L. leaf extract as a naturally-sourced reducing agent, without stabilizers or surfactants. This synthetic process is environmentally-friendly and avoids the use of toxic reducing agents. Phenolic hydroxyl groups in the leaf extract are believed to reduce Cu2+ in solution to generate Cu NPs that are subsequently stabilized on the MnO2 NP surfaces. The resulting Cu/MnO2 nanocomposite was fully characterized using X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy. This material was found to function as a highly active, efficient and recyclable heterogeneous catalyst for the reduction of Congo red, rhodamine B and methylene blue as well as nitro compounds such as 2,4-dinitrophenylhydrazine and 4-nitrophenol in the presence of NaBH4 in aqueous media at ambient temperature. The high stability of the Cu/MnO2 nanocomposite also allows the catalyst to be separated and reused several times without any significant loss of activity.

Key words: Biosynthesis, Centella asiatica L., Cu/MnO2 nanocomposite, Reduction, Nitroarene, Organic dyes