Biogenic Synthesis of Pd-Based Nanoparticles with Enhanced Catalytic Activity
Biogenic Synthesis of Pd-Based Nanoparticles with Enhanced Catalytic Activity
复制标题
具有增强催化活性的钯基纳米颗粒的生物合成
DOI：
10.1021/acsanm.7b00322
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发表时间：
2018-04
影响因子：
5.9
通讯作者：
Han-Qing Yu
中科院分区：
文献类型：
--
作者：
Lu Xiong;Xing Zhang;Yu-Xi Huang;Wu-Jun Liu;Ya-Li Chen;Sheng-Song Yu;Xiao Hu;Lei Cheng;Dong-Feng Liu;Han-Qing Yu
寻找高效、可持续的金属纳米粒子合成方法已成为研究热点。利用金属还原菌在常温下进行生物还原为金属纳米颗粒的制备提供了一条绿色途径，尤其是贵金属纳米颗粒的制备。在这项工作中，活化的Pd NPs的合成通过接触Pd 2+溶液与一个有效的金属还原希瓦氏菌oneidensis细菌，其中的细菌作为还原剂，盖帽，和稳定剂，和Pd NPs的形状和组成可以调整与活化KOH在高温下。活化态Pd纳米粒子对4-硝基苯酚（4-NP）还原为4-氨基苯酚（4-AP）具有良好的催化性能，其表观动力学常数为5.0 × 10- 3s-1，是生物源Pd纳米粒子的12倍，甚至与商业化的5.0wt%Pd/C相当。研究了不同温度和温度下Pd纳米粒子的聚集体、Pd/S比和载体表面积的变化。
Searching efficient sustainable approaches for the metal nanoparticles (NPs) synthesis has become a research focus. Bioreduction with metal-reducing bacterium at ambient temperature provides a green route for metal NPs synthesis, especially for precious metals. In this work, activated Pd NPs were synthesized by contacting Pd2+ solution with an efficient metal-reducing Shewanella oneidensis bacterium, in which the bacterium acted as reducing, capping, and stabilizing agents, and the shape and composition of the Pd NPs could be tuned with the activation of KOH at elevated temperatures. The as-activated Pd NPs showed a favorable performance toward catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP), with a remarkable apparent kinetic constant of 5.0 × 10–3 s–1, which was 12 times greater than that of the raw biogenic Pd NPs, even comparable to that of the commercial 5.0 wt % Pd/C. Changes of the Pd NPs aggregates, ratio of Pd to S, and surface area of the support at different temperatures and...