Chemical reactions of graphitic carbon nitride films with glass surfaces and their impact on photocatalytic activity
Chemical reactions of graphitic carbon nitride films with glass surfaces and their impact on photocatalytic activity
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石墨氮化碳薄膜与玻璃表面的化学反应及其对光催化活性的影响
DOI：
10.1039/d2cp01677j
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发表时间：
2022
影响因子：
3.3
通讯作者：
Hosokai Takuya
中科院分区：
文献类型：
--
作者：
Akaike Kouki;Hosokai Ayako;Nagashima Hiroki;Wei Qingshuo;Hosokai Takuya
石墨氮化碳（g-CN）薄膜是一种可见光驱动的光催化剂，近年来在水分解和高通量光催化方面的应用引起了人们的兴趣。在典型的合成中，通过将富氮前体和基底加热至500-600 °C来形成g-CN膜。加热的基底应影响前体的缩聚，从而改变g-CN膜的性质。在本文中，我们证明，钠钙玻璃，如商业载玻片，修改g-CN的化学结构。g-CN的末端氨基被氨腈和羟基部分取代。吸电子基团提供改性和未改性分子之间的前线轨道的能量偏移，促进激子解离。去除碱金属后，改性g-CN膜对甲基橙子的光降解速度比甜瓜膜快。在没有助催化剂的情况下激活g-CN膜的简单协议为通过选择包括废玻璃在内的基底来增强光催化活性铺平了新的道路。
Thin films of graphitic carbon nitride (g-CN), a visible-light-driven photocatalyst, have recently attracted interest for application in photoelectrochemical cells for water splitting and high-throughput photocatalysis. In typical syntheses, g-CN films are formed by heating the nitrogen-rich precursor and substrate to 500–600 °C. The heated substrate should affect the polycondensation of the precursor and thereby alter the properties of the g-CN film. In this paper, we demonstrate that soda-lime glass, such as commercial glass slides, modifies the chemical structure of g-CN. The terminal amino groups of g-CN are partially substituted with cyanamide and hydroxyl groups. The electron-withdrawing groups provide the energy offsets of the frontier orbitals between the modified and unmodified molecules, facilitating exciton dissociation. After alkali metals are removed, the modified g-CN film exhibits a faster photodegradation of methyl orange compared with a melon film. The simple protocol to activate a g-CN film without co-catalysts paves a new way to enhance photocatalytic activity via selections of substrates, including waste glass.