Carbon spheres anchored Co3O4 nanoclusters as an efficient catalyst for dye degradation
Carbon spheres anchored Co3O4 nanoclusters as an efficient catalyst for dye degradation
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DOI：
10.1016/j.apcata.2015.12.028
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发表时间：
2016-03-05
影响因子：
5.5
通讯作者：
Xu, Rong
中科院分区：
文献类型：
--
作者：
Dou, Jian;Yin, Shengming;Xu, Rong
在这里，我们开发了一种有效的策略，通过浸渍和沉积沉淀法将纳米和亚纳米尺寸的钴氧化物(Co3O4)颗粒固定在碳球载体上。在碳球的支持下，很小的Co3O4纳米颗粒均匀分布在表面，尺寸约为1-2 nm。XPS分析表明，表面钴物种与碳球上的羟基配位。在所考察的各种催化剂中，具有1-2 nm氧化钴团簇的Co/C-300纳米催化剂的活性最高，在不到10min的反应时间内，甲基橙的降解率达到99%以上。Co/C-300纳米催化剂具有较高的活性归因于纳米Co3O4颗粒尺寸较小，表面暴露出较多的染料降解反应中心。Co/C-300纳米催化剂是相当稳定的，可以循环使用至少四次，而不会实质上失去活性。(C)2015爱思唯尔B.V.保留所有权利。
Herein, we have developed an effective strategy to immobilize spinet cobalt oxide (Co3O4) particles of nanometer and subnanometer sizes on carbon sphere support via impregnation and deposition precipitation methods. With carbon spheres support, very small Co3O4 nanoparticles of around 1-2 nm are uniformly distributed on the surface. Based on XPS analysis, the surface cobalt species are found coordinated with hydroxyl groups from carbon spheres. Among the various catalysts investigated, the Co/C-300 nanocatalyst with 1-2 nm cobalt oxide clusters exhibits the highest activity with over 99% of methyl orange degraded in less than 10 min of reaction. The higher activity of Co/C-300 nanocatalyst was attributed to small size of Co3O4 nanoparticles with more surface sites exposed for dye degradation reaction. The Co/C-300 nanocatalyst is reasonably stable and could be recycled for at least four runs without losing activity substantially. (C) 2015 Elsevier B.V. All rights reserved.