表面改性
氮化碳
材料科学
光催化
石墨氮化碳
X射线光电子能谱
水溶液
光化学
分解水
化学工程
化学
无机化学
有机化学
催化作用
工程类
物理化学
作者
André Torres‐Pinto,Hanane Boumeriame,Cláudia G. Silva,Joaquim L. Faria,Adrián M.T. Silva
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2023-01-11
卷期号:11 (3): 894-909
被引量:9
标识
DOI:10.1021/acssuschemeng.2c04512
摘要
Carbon nitride (CN) is a polymer-based material thoroughly studied for different photocatalytic applications due to its optical, electronic, and chemical properties. Its main limitation is fast electron/hole recombination. To overcome this drawback, several functionalization methods have been applied using organic solvents and severe operating conditions. In the present work, a thermally exfoliated CN was functionalized for the first time via a hydrothermal route using glucose (G), perylene (P), and anthraquinone (A) by implementing water as solvent at a mild temperature (120 °C). The materials were tested for the photocatalytic production of hydrogen peroxide (H2O2) in aqueous solutions saturated with dissolved oxygen and in the presence of a sacrificial agent (isopropyl alcohol). Improved evolution rates of H2O2 were confirmed from 9.7 mmol g–1 h–1 for the unmodified CN material, up to 11.1, 14.2, and 25.0 mmol g–1 h–1 for the functionalized photocatalysts CN-G, CN-P, and CN-A, respectively. The surface chemistry studied by XPS, EDX, and FTIR revealed the specific functionalities allowing for improved energy transfer, faster redox reactions, and enhanced photoactivation. The optical and electrochemical characterizations corroborate the photocatalytic results since photoluminescence was severely quenched after functionalization, and the electronic properties were enhanced, both indicating reduced recombination of charge carriers. The band structure was also investigated, proving that the generation of H2O2 was thermodynamically favored for the functionalized materials, while H2O2 decomposition was suppressed.
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