Rational fabrication of a graphitic-C3N4/Sr2KNb5O15 nanorod composite with enhanced visible-light photoactivity for degradation of methylene blue and hydrogen production
Rational fabrication of a graphitic-C3N4/Sr2KNb5O15 nanorod composite with enhanced visible-light photoactivity for degradation of methylene blue and hydrogen production
复制标题
合理制备具有增强可见光光活性的石墨-C3N4/Sr2KNb5O15纳米棒复合材料，用于降解亚甲基蓝和产氢
DOI：
10.1039/c7ra07441g
复制
发表时间：
2017
期刊：
影响因子：
3.9
通讯作者：
Wark Michael
中科院分区：
文献类型：
--
作者：
Wang Ping;Sinev Ilya;Sun Feng;Li Huijun;Wang Ding;Li Qian;Wang XianYing;Marschall Rol;Wark Michael
采用石墨C3 N4直接负载于一维Sr 2KNb 5 O 15纳米棒上的方法制备了g-C3 N4/Sr 2KNb 5 O 15纳米棒复合光催化剂。通过耦合g-C3 N4和Sr 2KNb 5 O 15纳米棒，具有最佳的77wt%的g-C3 N4的纳米复合材料表现出比裸g-C3 N4高6.2倍的光降解活性，并且在适当的光沉积0.03wt%的Rh助催化剂后，从甲醇水溶液中的H2产生速率的增加达到高达12.1倍。此外，对制备方法的比较研究表明，由直接生长法制备的纳米复合材料的光降解速率被发现是3.4倍以上，只是通过物理混合形成的。结果表明，在纳米复合材料中形成适当的纳米界面的重要性。结合能带结构的理论预测，提出了一种可能的机制，包括通过直接生长方法在g-C3 N4和Sr 2KNb 5 O 15之间形成适当的界面，促进光生电子-空穴对的空间分离。
A g-C3N4/Sr2KNb5O15 nanorod composite photocatalyst was simply prepared by direct growth of graphitic C3N4 on one-dimensional Sr2KNb5O15 nanorods and evaluated by degradation of methylene blue (MB) and water splitting for H2 production under visible light irradiation. By coupling g-C3N4 and Sr2KNb5O15 nanorods, the nanocomposite with an optimal 77 wt% g-C3N4 exhibited 6.2 times higher activity for photodegradation than the bare g-C3N4 and the increase in H2 production rate from an aqueous methanolic solution reached up to 12.1 fold after appropriate photodeposition of 0.03 wt% Rh cocatalysts. Furthermore, a comparative study on the preparation methods shows the photodegradation rate of the nanocomposite prepared by the direct growth method was found to be 3.4 times higher than those formed just by physical mixing. The results demonstrate the importance of the formation of proper nano-interfaces in the nanocomposite. Combined with theoretical prediction of the band structures, a possible mechanism is thus proposed including the formation of proper interfaces between g-C3N4 and Sr2KNb5O15 by direct growth approachs promoting spatial separation of photoinduced electron–hole pairs.