Long-term photochemical stability of heteroaromatic dye-functionalised g-C3N4 via covalent linkage for efficient photocatalytic hydrogen evolution
作者:Shihang Liu、Xiaodi Chen、Chao Zhang、Xingliang Liu、Shiai Xu
DOI:10.1016/j.dyepig.2023.111128
日期:2023.4
carbazole (CBZ), phenothiazine (PTZ), and phenoxazine (POZ) moiety as electron donor cores and linked to g-C3N4 with amide covalent bonds were synthesized. Thereafter, we studied the long-term photochemical stability and degradation mechanism of the associated dye-sensitised g-C3N4 with covalent linkage or weak interaction. The results revealed that most of the dyes degraded and became unstable after
在这项研究中,合成了三种典型的 D–π–A 型杂芳族有机染料,它们含有咔唑 (CBZ)、吩噻嗪 (PTZ) 和吩恶嗪 (POZ) 部分作为电子供体核心,并通过酰胺共价键与gC 3 N 4相连。此后,我们研究了具有共价键或弱相互作用的相关染料敏化gC 3 N 4的长期光化学稳定性和降解机制。结果表明,大部分染料在光照射下被gC 3 N 4吸收后降解并变得不稳定。有趣的是,在目标染料与 gC 3 N 4连接后具有酰胺共价键,可以有效地促进光稳定性并提高到高水平的稳定性。对于 POZ-S 染料共价键连接的样品 gC 3 N 4 /POZ-S,约 90.5% 的染料被保留,而物理吸收的染料样品 gC 3 N 4 +POZ-S仅保留约 25.3% 30分钟的辐照老化试验。此外,获得的 gC 3 N 4 /POZ-S 样品表现出增强的 H 2释放活性,其光催化 H 2产率约为纯 gC 3 N 4的 96