光催化
材料科学
罗丹明B
制氢
电子顺磁共振
高分辨率透射电子显微镜
三元运算
石墨氮化碳
异质结
光降解
分解水
化学工程
纳米复合材料
贵金属
光化学
氢
纳米技术
金属
化学
催化作用
透射电子显微镜
冶金
有机化学
程序设计语言
工程类
物理
生物化学
光电子学
核磁共振
计算机科学
作者
Qiong Wu,Dingze Lu,Kiran Kumar Kondamareddy,Wingkei Ho,Qiuping Wang,Yuhao Zhang,Yimei Zeng,Boyu Zhang,Lihao Xie,Baofeng Zhao,Zhennan Wang,Hongjuan Hao,Huiqing Fan,Hongmei Wang
标识
DOI:10.1016/j.ijhydene.2022.02.153
摘要
The two-dimensional (2D) graphitic carbon nitride (g-C3N4) nanosheets based composites are prepared in the form of the NiS/g-C3N4, CdS/g-C3N4 and CdS/NiS/g-C3N4 using a facile and reliable method of chemical deposition. The TEM and HRTEM images demonstrated a spectacular representation of the 2D lamellar microstructure of the g-C3N4 with adequately attached CdS and NiS nanoparticles. The changes in crystallinity and the surface elemental valence states of composites with the incorporation of two metal sulphides are studied, which confirmed the formation of composites. The photocatalytic response of the composites was estimated by photodegradation of Rhodamine B (C28H31ClN2O3–RhB), and the ternary composite CdS/NiS/g-C3N4 samples exhibited the superior photocatalytic performance. Further, the free radical capture and electron paramagnetic resonance (EPR) spectroscopy experiments identified the main active species that contributed to the photocatalytic reaction. Besides, the samples’ photocatalytic performance was evaluated by photocatalytic hydrogen production. The stability of the performance-optimized composite was determined by employing cyclic experiments over five cycles. The CdS/NiS/g-C3N4 showed the highest efficiency of hydrogen production i.e. about 423.37 μmol.g−1.h−1, which is 2.89 times that of the pristine g-C3N4. Finally, two types of heterojunction structures were proposed to interpret the enhanced photocatalytic efficiency.
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