Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA.
Chemosphere. 2013 Apr;91(2):165-71. doi: 10.1016/j.chemosphere.2012.12.037. Epub 2013 Jan 17.
A new class of bimetallic materials based on palladium-decorated iron nanotubes is described that demonstrates high reactivity in dechlorination reactions. This high dechlorination efficiency was attributed to the high surface area to volume ratio of the hollow nanotubes structure. Herein, we evaluated the effect of different conditions, such as the nanotube size, and the palladium loading on the efficiency of the dechlorination of PCB 77, a model coplanar polychlorinated biphenyl (PCB), by the Pd/Fe bimetallic nanotubes system. The efficiency of the dechlorination was lowered by decreasing the tube diameter from 200 to 100 nm. In addition, the interior surface as well as the exterior surface of the as-synthesized Pd/Fe bimetallic nanotubes was found to contribute to the high efficiency of the dechlorination of PCB 77. The dechlorination of PCB 77 by Pd/Fe bimetallic nanotubes demonstrated small activation energy indicating diffusion controlled reaction. The as-prepared Pd/Fe bimetallic nanotubes showed extended lifetime activity when used in multiple dechlorination cycles.
一种新型的钯修饰铁纳米管双金属材料具有高效的脱氯反应活性。这种高脱氯效率归因于空心纳米管结构的高表面积与体积比。在此，我们评估了不同条件对脱氯效率的影响，例如纳米管的尺寸和钯的负载量，以及 Pd/Fe 双金属纳米管系统对 PCB77（一种典型的共面多氯联苯 PCB）的脱氯效率。通过将管径从 200nm 减小到 100nm，脱氯效率降低。此外，发现合成的 Pd/Fe 双金属纳米管的内外表面均有助于 PCB77 的高效脱氯。Pd/Fe 双金属纳米管对 PCB77 的脱氯反应表现出小的活化能，表明反应受扩散控制。在多次脱氯循环中使用时，所制备的 Pd/Fe 双金属纳米管显示出延长的寿命活性。
