Abstract Carbon spheres decorated with cobalt oxide nanoparticles, which can interact with the visible light were prepared by facile microwave assisted green chemical protocol. The combination of cobalt and carbon spheres results in the formation of p-n heterojunction. Also, this combination was effective in the separation of photogenerated electron-hole pairs. The photocatalytic property of the material was evaluated by employing it for the degradation of both anionic dye methyl orange and cationic dye malachite green in water and it is also used for the hydrogen evolution reaction. Different mass ratios such as 2, 4, 6 and 8 wt% of Co-carbon spheres were employed in the degradation process. However, Co-carbon spheres with mass ratio 6% displayed the best photocatalytic performance. The decoloration and mineralization efficiencies were 89.4% ± 2.8 and 88.6% ± 3.2 after 40 min of treatment respectively for methyl orange and malachite green. Scavenger studies further revealed the photo generated holes as the main oxidant and the synergistic effect of cobalt and carbon for excellent photocatalytic efficiency of the material.

中文翻译：

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微波辅助绿色合成 p 型 Co3O4@介孔碳球同时降解染料和光催化析氢反应

摘要 通过简便的微波辅助绿色化学方法制备了可以与可见光相互作用的氧化钴纳米粒子装饰的碳球。钴和碳球的结合导致形成 pn 异质结。此外，这种组合在分离光生电子 - 空穴对方面是有效的。通过将其用于阴离子染料甲基橙和阳离子染料孔雀石绿在水中的降解以及它也用于析氢反应来评估该材料的光催化性能。在降解过程中使用了不同质量比，例如 2、4、6 和 8 wt% 的 Co-碳球。然而，质量比为 6% 的 Co-碳球表现出最好的光催化性能。脱色矿化效率为89.4%±2。处理 40 分钟后，甲基橙和孔雀石绿分别为 8 和 88.6% ± 3.2。清除剂研究进一步揭示了光生空穴作为主要氧化剂以及钴和碳的协同作用，使材料具有优异的光催化效率。