Qiu Pengyuan, Liang Zhangqian, Liu Xiang, Qian Xiu, Cui Hongzhi, Tian Jian
School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China.
J Colloid Interface Sci. 2020 Jul 1;571:318-325. doi: 10.1016/j.jcis.2020.03.062. Epub 2020 Mar 18.
Finding an efficient and environment-friendly photocatalyst is significant for photocatalysis. In this research, a simple calcination with urea and salicylic acid (SA) is created for constructing a SA-modified graphite carbon nitride (g-CN-SA) photocatalyst. Compared to pure g-CN, g-CN-SA presents broadened light absorption, due to n → π* transition at nitrogen atoms. Interestingly, SA modification can strongly affect chemical and physical properties of g-CN, including increasing Brunauer-Emmett-Teller (BET) specific area, forming porous structure, improving optical absorption and promoting carrier separation, thus achieving the improved photocatalytic activity of g-CN-SA. The optimum g-CN-SA with the mass of SA 0.05 g (g-CN-SA-0.05) presents a high ammonia evolution rate of 7.92 mmol Lh g, 2.5 and 1.4 times than g-CN (3.2 mmol Lh g) and g-CN loaded with Pt (5.47 mmol Lh g). Furthermore, the excellent photostability of g-CN-SA is also achieved.
找到一种高效且环境友好的光催化剂对于光催化来说意义重大。在本研究中，通过尿素和水杨酸（SA）进行简单煅烧来构建SA修饰的石墨相氮化碳（g-CN-SA）光催化剂。与纯g-CN相比，g-CN-SA由于氮原子处的n→π*跃迁而呈现出拓宽的光吸收。有趣的是，SA修饰会强烈影响g-CN的化学和物理性质，包括增加比表面积（BET）、形成多孔结构、改善光吸收以及促进载流子分离，从而实现g-CN-SA光催化活性的提高。SA质量为0.05 g的最佳g-CN-SA（g-CN-SA-0.05）的产氨速率高达7.92 mmol Lh g，分别是g-CN（3.2 mmol Lh g）和负载Pt的g-CN（5.47 mmol Lh g）的2.5倍和1.4倍。此外，g-CN-SA还具有出色的光稳定性。
