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首页> 外文期刊>Materials science & engineering >In situ green synthesis of Ag nanoparticles on herbal tea extract (Stachys lavandulifolia)-modified magnetic iron oxide nanoparticles as antibacterial agent and their 4-nitrophenol catalytic reduction activity
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In situ green synthesis of Ag nanoparticles on herbal tea extract (Stachys lavandulifolia)-modified magnetic iron oxide nanoparticles as antibacterial agent and their 4-nitrophenol catalytic reduction activity

机译：以凉茶提取物（Stachys lavandulifolia）-修饰的磁性氧化铁纳米粒子为抗菌剂原位绿色合成Ag纳米粒子及其4-硝基苯酚催化还原活性

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For first time, we designed an environment friendly technique novel hybrid magnetic nanocomposite with the potency of both reducing and stabilizing agent for immobilization of metal nanoparticles. Stachys lavandulifolia extract having a lot of carbonyl and phenolic hydroxyl functional groups can be applied in the Fe_3O_4 NPs modification. Furthermore, in aqueous solution, the complexation feasibility of polyphenols with silver ions can enhance the capacity and surface properties of the Fe_3O_4@S. lavandulifolia NPs for sorbent and in situ reduction of silver tons. So, as both the stabilizing and reducing agent, the novel magnetic nano-sorbent (Fe_3O_4@S. lavandulifolia NPs) has potential ability for silver nano particles immobilization to create a novel magnetic silver nanocatalyst. So that, no additional reductants, toxic reagents and intricate instruments are needed to prepare the catalyst. The morphology, structure, and physicochemical properties were elucidated by several analytical methods like, field emission scanning electron microscope (FESEM), high resolution transmission electron microscopy (HRTEM) images, energy-dispersive X-ray spectroscopy (EDS), vibrating sample magnetometer (VSM), X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), FT-IR spectroscopy, and inductively coupled plasma (ICP). As recyclable nanocatalyst, Fe_3O_4@S. lavandulifolia/Ag indicated high catalytic activity for 4-nitrophenol (4-NP) reduction at ambient temperature. Ultimately, the Fe_3O_4@S. lavandulifolia/Ag antibacterial properties was examined against two bacteria (Staphylococcus aureus (Staph. aureus) and Escherichia coli (E. coli)) and indicated its antibacterial activities against gram negative (E. coli) bacteria and gram positive (Staph aureus).
机译：首次，我们设计了一种环境友好的新型杂化磁性纳米复合材料，该复合材料具有还原剂和稳定剂的作用，可固定化金属纳米颗粒。具有许多羰基和酚羟基官能团的水苏提取物可用于Fe_3O_4 NPs修饰。此外，在水溶液中，多酚与银离子的络合可行性可以增强Fe_3O_4 @ S的容量和表面性能。 lavandulifolia NP用于吸附剂和原位还原银吨。因此，作为稳定剂和还原剂，新型磁性纳米吸附剂（Fe_3O_4 @ S。lavandulifolia NPs）具有潜在的固定化银纳米颗粒的能力，以产生新型磁性银纳米催化剂。因此，不需要额外的还原剂，有毒试剂和复杂的仪器即可制备催化剂。通过几种分析方法阐明了形态，结构和理化性质，例如场发射扫描电子显微镜（FESEM），高分辨率透射电子显微镜（HRTEM）图像，能量色散X射线光谱（EDS），振动样品磁强计（ VSM），X射线衍射分析（XRD），X射线光电子能谱（XPS），FT-IR光谱和电感耦合等离子体（ICP）。作为可回收的纳米催化剂，Fe_3O_4 @ S。 lavandulifolia / Ag在环境温度下显示出对4-硝基苯酚（4-NP）还原的高催化活性。最终，Fe_3O_4 @ S。检验了lavandulifolia / Ag对两种细菌（金黄色葡萄球菌（Staph。aureus）和大肠杆菌（E. coli））的抗菌性能，并表明了其对革兰氏阴性（E. coli）和革兰氏阳性（Staph aureus）的抗菌活性。

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