Enhanced full-spectrum photocatalytic activity of 3D carbon-coated C3N4 nanowires via giant interfacial electric field

光催化 电场 材料科学 X射线光电子能谱 吸收(声学) 可见光谱 碳纤维 吸收光谱法 反应速率常数 化学工程 光电子学 分析化学(期刊) 化学 复合材料 动力学 光学 催化作用 物理 有机化学 工程类 复合数 量子力学
作者
Yajun Wang,Mengmeng Liu,Fan Fan,Gang Li,Jianxia Duan,Yuming Li,Guiyuan Jiang,Wenqing Yao
出处
期刊:Applied Catalysis B-environmental [Elsevier BV]
卷期号:318: 121829-121829 被引量:91
标识
DOI:10.1016/j.apcatb.2022.121829
摘要

Strong interfacial electric field can promote the separation and transfer of photogenerated carriers of photocatalysts. Herein, a three-dimensional (3D) network structure assembled from carbon-coated C 3 N 4 nanowires (denoted as 3D C 3 N 4 @C) with a giant interfacial electric field was prepared. The unique 3D structure works with the carbon layer to expand the light absorption range of C 3 N 4 to the full spectrum. Under visible-light irradiation (λ≥420 nm), the degradation rate constants of 3D C 3 N 4 @C for bisphenol A and phenol were 41.2 and 5.7 times that of bulk g-C 3 N 4 , respectively. Meanwhile, the interfacial electric field of 3D C 3 N 4 @C-2mol/L was 5.14 times that of bulk g-C 3 N 4 . The charge transfer process of 3D C 3 N 4 @C was confirmed by synchronous illumination X-ray photoelectron spectroscopy and DFT. The significantly improved activity was mainly ascribed to the giant interfacial electric field between g-C 3 N 4 and the carbon layer, which significantly promoted the separation and transportation of photo-generated charge carriers. • Three-dimensional (3D) network structure assembled by carbon-coated C 3 N 4 nanowires was prepared. • The giant interfacial electric field between g-C 3 N 4 and carbon, as well as the synergy between the unique 3D structure and the carbon coating, improve the photocatalytic performance and light absorption. • The rate constants of 3D C 3 N 4 @C-xmol/L for bisphenol A and phenol degradation were 41.2 times and 5.7 times higher than those of g-C 3 N 4 , respectively.
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