光催化
石墨氮化碳
光化学
吸附
过氧化氢
材料科学
吸收(声学)
氧气
光降解
碳纤维
析氧
化学
催化作用
化学工程
电化学
有机化学
电极
工程类
复合材料
物理化学
复合数
作者
Zilong Zhang,Peng Luo,Li‐Hua Gan,Ya‐Nan Zhao,Xiang Wang,Huanjun Peng,Jingdong Peng
标识
DOI:10.1016/j.apsusc.2023.159118
摘要
The synthesis of hydrogen peroxide from photocatalytic reaction of pure water and oxygen has sparked extensive research, however, most photocatalysts have weak light absorption and fast carrier recombination rates. Herein, a C-doped graphitic carbon nitride g-C3N4 with defects (N vacancies and -C≡N groups) was prepared using a supramolecular preassembly method. The as-prepared photocatalyst (s-B0.3CN) exhibited good H2O2 generation performance (108.4 μM under λ ≥ 420 nm in pure water, 2 h) and efficient degradation of 4-CP in a photocatalysis-self-Fenton process. The structure formed by the C-doped and defects significantly facilitated light absorption and carrier separation, increased the specific surface area of the material and enhanced the adsorption of oxygen. Furthermore, this research contributes the understanding of the mechanisms about photocatalytic H2O2 evolution and photocatalysis-self-Fenton. Simultaneously, dual-channel photocatalytic H2O2 evolution mechanisms (O2 + 2e- + 2H+→ H2O2,2H2O + 2 h+ →H2O2 + 2H+) of s-B0.3CN under irradiation were demonstrated.
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