Exceptional catalytic performance of ultrafine Cu2O nanoparticles confined in cubic mesoporous carbon for 4-nitrophenol reduction
Exceptional catalytic performance of ultrafine Cu2O nanoparticles confined in cubic mesoporous carbon for 4-nitrophenol reduction
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DOI：
10.1016/j.apsusc.2017.08.097
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发表时间：
2018
影响因子：
6.7
通讯作者：
P. C. Rath;D. Saikia;Mrinalini Mishra;H. Kao
中科院分区：
文献类型：
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作者：
P. C. Rath;D. Saikia;Mrinalini Mishra;H. Kao
将不同类型的Cu基纳米粒子Cu 2 O、Cu和CuO均匀分散在立方有序介孔碳CMK-8（分别记为Cu2O@CMK-8、Cu@CMK-8和CuO@CMK-8）上，比较研究了它们对4-硝基苯酚（4-NP）的催化还原性能。CMK-8中Cu 2 O、Cu和CuO纳米颗粒的平均粒径分别为4.0、8.1和4.3 nm。与Cu@CMK-8和CuO@CMK-8相比，当考虑实际Cu负载时，Cu2O@CMK-8纳米复合材料表现出2.21 × 10−2s− 1的出色速率常数和203 s−1gCu− 1的异常高的活性参数。均匀的粒度分布沿着高BET表面积和在催化过程中产生高活性新生Cu（0）纳米颗粒的能力活化了4-NP和BH 4-，从而有效地吸附在Cu2O@CMK-8的活性位点上。结果表明，这些铜基CMK-8纳米复合材料的催化性能强烈依赖于铜的状态和它们的颗粒尺寸。此外，Cu2O@CMK-8可高度重复使用五个连续循环，而其活性没有显著降低。
Different types of Cu-based nanoparticles, namely Cu2O, Cu and CuO were homogeneously dispersed on cubic ordered mesoporous carbon CMK-8 (denoted as Cu2O@CMK-8, Cu@CMK-8 and CuO@CMK-8, respectively) and their performances for catalytic reduction of 4-nitrophenol (4-NP) were comparatively studied. The average particle size of Cu2O, Cu, and CuO nanoparticles confined in CMK-8 were estimated to be 4.0, 8.1, and 4.3 nm, respectively. In comparison to Cu@CMK-8 and CuO@CMK-8, the Cu2O@CMK-8 nanocomposite exhibits an outstanding rate constant of 2.21 × 10−2s−1and an exceptionally high activity parameter of 203 s−1gCu−1when the actual Cu loading is considered. The uniform particle size distribution along with high BET surface area and the ability to generate highly active nascent Cu(0) nanoparticles during the catalytic process activate both the 4-NP and BH4−to be efficiently adsorbed on the active sites of Cu2O@CMK-8. It is found that the catalytic properties of these Cu-based CMK-8 nanocomposites strongly depend on the state of Cu and their particle size. Furthermore, Cu2O@CMK-8 is highly reusable for five successive cycles without significant degradation of its activity.