Tuning the Photocatalytic Activity of Graphitic Carbon Nitride by Plasma-Based Surface Modification
Tuning the Photocatalytic Activity of Graphitic Carbon Nitride by Plasma-Based Surface Modification
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通过等离子体表面改性调节石墨碳氮化物的光催化活性
DOI：
10.1021/acsami.7b06637
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发表时间：
2017-07-26
影响因子：
9.5
通讯作者：
Zhao, Yuanchun
中科院分区：
文献类型：
--
作者：
Ji, Xueqiang;Yuan, Xiaohong;Zhao, Yuanchun
在这项研究中，我们证明，等离子体处理可以是一种简单和环境友好的方法来进行表面改性的石墨碳氮化物（g-CN），导致其光催化活性的显着调制。g-CN的本体性质，包括颗粒大小，结构，组成和电子能带结构，没有变化后，由氧或氮等离子体处理;然而，其表面组成和比表面积表现出显着的差异，相应的氧功能化诱导的等离子体后处理。引入的氧官能团在降低光激发电荷载流子的复合速率中起关键作用。因此，氧等离子体处理的样品显示出”更上级的光催化活性，在可见光照射下降解罗丹明B（RhB）的活性比原始g-CN高约4.2倍，而氮等离子体处理的样品的活性表现出轻微的下降。此外，这两个等离子体处理的样品被发现具有令人印象深刻的光催化稳定性。我们的研究结果表明，等离子体处理可以是一种常规的策略，进行表面改性的g-CN在粉末和薄膜的形式，这不仅具有广泛的兴趣，开发g-CN基的高性能光催化剂，但也用于构建光电化学电池和光电器件与提高能量转换效率。
In this study, we demonstrate that plasma treatment can be a facile and environmentally friendly approach to perform surface modification of graphitic carbon nitride (g-CN), leading to a remarkable modulation on its photocatalytic activity. The bulk properties of g-CN, including the particle size, structure, composition, and electronic band structures, have no changes after being treated by oxygen or nitrogen plasma; however, its surface composition and specific surface area exhibit remarkable differences corresponding to an oxygen functionalization induced by the plasma post-treatment. The introduced oxygen functional groups play a key role in reducing the recombination rate of the photoexcited charge carries. As a consequence, the oxygen-plasma-treated sample shows" a much superior photocatalytic activity, which is about 4.2 times higher than that of the pristine g-CN for the degradation of rhodamine B (RhB) under visible light irradiation, while the activity of nitrogen-plasma-treated sample exhibits a slight decrease. Furthermore, both of the plasma-treated samples are found to possess impressive photocatalytic stabilities. Our results suggest that plasma treatment could be a conventional strategy to perform surface modification of g-CN in forms of both powders and thin films, which holds broad interest not only for developing g-CN-based high-performance photocatalysts but also for constructing photoelectrochemical cells and photoelectronic devices with improved energy conversion efficiencies.