In situ one-step hydrothermal synthesis of oxygen-containing groups-modified g-C3N4 for the improved photocatalytic H-2-evolution performance
In situ one-step hydrothermal synthesis of oxygen-containing groups-modified g-C3N4 for the improved photocatalytic H-2-evolution performance
复制标题
原位一步水热合成含氧基团修饰的 g-C3N4 以提高光催化析氢性能
DOI：
10.1016/j.apsusc.2017.08.050
复制
发表时间：
2018
影响因子：
6.7
通讯作者：
Yu Huogen
中科院分区：
文献类型：
--
作者：
Wu Xinhe;Chen Fengyun;Wang Xuefei;Yu Huogen
对g-C3 N4进行表面改性是通过促进界面催化反应来提高其光催化放氢性能的最有效方法之一。本研究采用原位一步水热法，在纯水中对g-C3 N4进行了简单、绿色的水热处理，制备了含氧基团改性的g-C3 N4（OG/g-C3 N4）。结果表明，水热处理（180 °C）不仅可以显著提高OG/g-C3 N4的比表面积（从2.3 m2 g −1提高到69.8 m2 g −1），而且通过层间分层和层内解聚，在OG/g-C3 N4表面形成了含氧基团（单键OH和C双键O）。光催化实验结果表明，水热处理后的OG/g-C3 N4样品的析氢性能明显提高。当水热时间为6 h时，OG/g-C3 N4（6 h）的光催化活性最高，明显高于体相g-C3 N4的光催化活性约1倍。7. OG/g-C3 N4光催化剂的放氢速率提高除了比表面积增加外，还主要归因于含氧基团的形成，这些含氧基团可能是有效的放氢活性中心。该方法具有制备简单、绿色的特点，为高效光催化材料的开发提供了新的思路。
Surface modification of g-C3N4is one of the most effective strategies to boost its photocatalytic H2-evolution performance via promoting the interfacial catalytic reactions. In this study, anin situone-step hydrothermal method was developed to prepare the oxygen-containing groups-modified g-C3N4(OG/g-C3N4) by a facile and green hydrothermal treatment of bulk g-C3N4in pure water without any additives. It was found that the hydrothermal treatment (180 °C) not only could greatly increase the specific surface area (from 2.3 to 69.8 m2g−1), but also caused the formation of oxygen-containing groups (single bondOH and Cdouble bondO) on the OG/g-C3N4surface, via the interlayer delamination and intralayer depolymerization of bulk g-C3N4. Photocatalytic experimental results indicated that after hydrothermal treatment, the resultant OG/g-C3N4samples showed an obviously improved H2-evolution performance. Especially, when the hydrothermal time was 6 h, the resultant OG/g-C3N4(6 h) exhibited the highest photocatalytic activity, which was clearly higher than that of the bulk g-C3N4by a factor of ca. 7. In addition to the higher specific surface area, the enhanced H2-evolution rate of OG/g-C3N4photocatalysts can be mainly attributed to the formation of oxygen-containing groups, which possibly works as the effective H2-evolution active sites. Considering the facie and green synthesis method, the present work may provide a new insight for the development of highly efficient photocatalytic materials.