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. 2019 Nov 15;556:206-213. doi: 10.1016/j.jcis.2019.08.067. Epub 2019 Aug 19.
The porous g-CN with nitrogen defects and cyano groups (NC-g-CN) is prepared via an alkali-assisted heat treatment of urea. Alkali can break hydrogen bonds, which accelerate thermal polymerization of urea and formation of nitrogen defects/cyano groups. The presence of nitrogen defects extends the absorption of visible light to longer wavelengths region. The cyano groups can trap g-CN's photoinduced electrons and therefore suppress charge recombination. The formation of porous structure increases the surface area and exposes more active sites. As a consequence, compared to pure g-CN, NC-g-CN shows boosted visible photocatalytic nitrogen fixation activity (1.59 mmol h g) without co-catalysts.
多孔 g-CN 具有氮缺陷和氰基（NC-g-CN），通过尿素的碱辅助热处理制备。碱可以破坏氢键，从而加速尿素的热聚合和氮缺陷/氰基的形成。氮缺陷的存在将可见光的吸收扩展到更长的波长区域。氰基可以捕获 g-CN 的光致电子，从而抑制电荷复合。多孔结构的形成增加了表面积并暴露了更多的活性位点。因此，与纯 g-CN 相比，在没有共催化剂的情况下，NC-g-CN 表现出增强的可见光光催化固氮活性（1.59mmolh g）。
