碳纳米钯的生物合成及其催化性能研究

将奥奈达希瓦氏菌(S. oneidensis MR-1)原位还原形成的零价纳米钯颗粒负载在碳纳米管(CNTs)表面，制备了Pd/CNTs纳米复合材料。用TEM、XPS等多种手段对材料进行了表征，并用对硝基苯酚(4-NP)的还原降解反应评价了Pd/CNTs的催化性能。表征结果表明，钯纳米颗粒(直径2~3 nm)较均匀地分散在CNTs表面；钯负载在CNTs上会造成其拉曼峰强的增大和特征峰的偏移，且结晶度和颗粒数目随着负载量的增加而增加。性能评价表明，Pd/CNTs对4-NP还原降解具有较高催化性能，较其催化效率较单一的CNTs降解效率提高了6.3倍；在pH = 10的条件下，5% Pd/CNTs催化18 min可将4-NP降解99.5%，经6个反应循环后对4-NP的去除率仍保持在95.2%。

Study on biosynthesis and catalytic performance of Pd/CNTs

Pd/CNTs nanocomposites were prepared by in situ reduction of zero-valent Pd nanoparticles formed by Shewanella oneidensis MR-1 on the surface of carbon nanotubes (CNTs). The materials were characterized by TEM, XPS and other means, and the catalytic performance of Pd/CNTs was evaluated by the reductive degradation of 4-nitrophenol (4-NP). The characterization results showed that palladium nanoparticles (2~3 nm in diameter) were well dispersed on the CNTs surface. Palladium loading on CNTs will increase the Raman peak strength and shift the characteristic peak, and the crystallinity and particle number will increase with the increase of loading amount. The performance evaluation showed that Pd/CNTs had high catalytic performance for 4-NP reduction degradation, which was 6.3 times higher than that of CNTs alone. Under the condition of pH=10, 5% Pd/CNTs can degrade 99.5% of 4-NP in 18 min, and the removal rate of 4-NP remains at 95.2% after six reaction cycles.