Microbial synthesis of graphene-supported highly-dispersed Pd-Ag bimetallic nanoparticles and its catalytic activity
Microbial synthesis of graphene-supported highly-dispersed Pd-Ag bimetallic nanoparticles and its catalytic activity
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石墨烯负载高分散Pd-Ag双金属纳米粒子的微生物合成及其催化活性
DOI：
10.1002/jctb.6150
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发表时间：
2019-08-02
影响因子：
3.4
通讯作者：
Cheng, Yuanyuan
中科院分区：
文献类型：
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作者：
Han, Ruishan;Song, Xin;Cheng, Yuanyuan
石墨烯负载的纳米复合材料因其独特的性能而成为有前途的催化剂。这种复合催化剂的生物合成与其他方法相比具有几个优点，例如污染小。钯纳米粒子具有多功能的催化活性，其稳定性和活性可以通过与包括石墨烯在内的其他纳米材料的杂化而显著提高。结果采用希瓦氏菌MR-1一步生物合成法制备了石墨烯负载钯银纳米粒子（Pd-Ag/rGO）。希瓦氏菌MR-1通过同时还原硝酸银（AgNO 3）、硝酸钯（II）（Pd（NO3）（2））和氧化石墨烯（GO）合成了Pd-Ag/rGO。采用透射电子显微镜、能量色散X射线衍射仪、X射线光电子能谱仪、傅里叶变换红外光谱仪和拉曼光谱仪对Pd-Ag/rGO的形貌和组成进行了表征。以对硝基苯酚为模型化合物，在常温常压下考察了Pd-Ag/rGO催化剂的加氢活性。当Pd/Ag比为1：1，细菌浓度为1.0的OD 600（在600 nm处测量的光密度）时，Pd-Ag/rGO表现出最佳的催化性能。因此，所制备的Pd-Ag/rGO催化4-NP还原的动力学速率常数为0.2413min（-1），其被列为报道的用于4-NP还原的顶级催化剂之一。结论本研究为制备高催化活性的石墨烯负载杂化纳米粒子提供了一种节省材料和能源的方法。(c)2019化学工业协会
BACKGROUND Graphene-supported nanocomposites are promising catalysts for their unique properties. Biosynthesis of such hybrid catalysts possesses several advantages over other methods such as less pollution. The palladium nanoparticle has versatile catalytic activities and its stability and activities can be significantly improved through hybridization with other nanomaterials including graphene. RESULTS In this study, bimetallic palladium-silver nanoparticles supported on graphene (Pd-Ag/rGO) was prepared through one-step biosynthesis using a bacterium Shewanella oneidensis MR-1. Shewanella oneidensis MR-1 synthesized Pd-Ag/rGO through simultaneous reduction of silver nitrate (AgNO3), palladium(II) nitrate (Pd(NO3)(2)) and graphene oxide (GO). The morphology and composition of the Pd-Ag/rGO were characterized by transmission electron microscopy, energy dispersive X-ray, X-ray diffraction, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy and Raman spectroscopy. Furthermore, the hydrogenation activity of synthesized Pd-Ag/rGO was tested using 4-nitrophenol as a model chemical at room temperatures and pressure. The Pd-Ag/rGO showed the best catalytic performance when Pd/Ag ratio was 1:1 and bacterial concentration was 1.0 of OD600 (optical density measured at a wavelength of 600 nm) for the preparation of Pd-Ag/rGO. Therefore, the kinetic rate constant for 4-NP reduction was 0.2413 min(-1) catalyzed by as-prepared Pd-Ag/rGO, which is listed as one of the top level reported catalysts for 4-NP reduction. CONCLUSION Therefore, this study demonstrated a material and energy-saving method to synthesize hybrid nanoparticles supported on graphene with high catalytic activity. (c) 2019 Society of Chemical Industry