Engineering the Photocatalytic Behaviors of g/C3N4-Based Metal-Free Materials for Degradation of a Representative Antibiotic
Engineering the Photocatalytic Behaviors of g/C3N4-Based Metal-Free Materials for Degradation of a Representative Antibiotic
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设计 g/C3N4 基无金属材料的光催化行为以降解代表性抗生素
DOI：
10.1002/adfm.202002353
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发表时间：
2020-06-18
影响因子：
19
通讯作者：
Wang, Zhanguo
中科院分区：
文献类型：
--
作者：
Deng, Yanchun;Liu, Jun;Wang, Zhanguo
石墨化碳氮化物(g/C3N4)作为一种高效、无金属的光催化剂具有广阔的应用前景，但设计高效、选择性降解复杂分子的光催化行为仍是一项具有挑战性的工作。本论文通过对g/C(3)N(4)催化剂进行能带调节、电荷提取优化和助催化剂修饰等手段，对其光催化性能进行了修饰。二者的结合对提高林可霉素的光催化降解速率和降解程度具有协同作用。与固有的g/C3N4相比，结构优化的光催化剂的降解速率提高了10倍。有趣的是，各种方法和实验证明了g/C3N4复合体系光催化剂的特定催化机理。在降解过程中，活性物种包括中心点O-2(-)、中心点OH和h(+)在不同的光催化剂中具有不同的贡献。在光催化过程中，中间体H_2O_2起着重要的作用，首次阐明了其详细的功能和来源。
Graphitic carbon nitride (g/C3N4) is of promise as a highly efficient metal-free photocatalyst, yet engineering the photocatalytic behaviours for efficiently and selectively degrading complicated molecules is still challenging. Herein, the photocatalytic behaviors of g/C(3)N(4)are modified by tuning the energy band, optimizing the charge extraction, and decorating the cocatalyst. The combination shows a synergistic effect for boosting the photocatalytic degradation of a representative antibiotic, lincomycin, both in the degradation rate and the degree of decomposition. In comparison with the intrinsic g/C3N4, the structurally optimized photocatalyst shows a tenfold enhancement in degradation rate. Interestingly, various methods and experiments demonstrate the specific catalytic mechanisms for the multiple systems of g/C3N4-based photocatalysts. In the degradation, the active species, including center dot O-2(-), center dot OH, and h(+), have different contributions in the different photocatalysts. The intermediate, H2O2, plays an important role in the photocatalytic process, and the detailed functions and originations are clarified for the first time.