期刊
APPLIED SURFACE SCIENCE
卷 476, 期 -, 页码 706-715出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.01.147
关键词
Rhodmine B; BiOCl; g-C3N4; Ultrathin nanosheets; Photodegradation
类别
资金
- National Natural Science Foundation [21406252]
- Youth Innovation Promotion Association CAS [2012170]
- Taishan Scholar Project of Shandong Province [ts201712076]
- Taishan Scholars Climbing Program of Shandong [tspd20150210]
Herein, in situ surfactant-free synthesis of ultrathin BiOCl/g-C3N4 (BOC/CN) nanosheets for enhanced visible-light photodegradation of rhodamine B was described. The formation procedure, microstructural morphology, structure, optical properties, and photocatalytic activity were researched in detail. The results show that ultrathin BOC/CN heterojunctions nanosheets were successfully constructed via one-step surfactant-free solvothermal method by introducing CN into the synthesis system of BOC, and the thickness of BOC/CN nanosheets was similar to 3.5 nm. The ultrathin 2D/2D BOC/CN heterojunctions significantly enhanced the photodegradation of RhB dye under visible-light irradiation. The best-performing sample BOC/CN-60 had 3.9 and 12.8 times higher photocatalytic efficiency for visible-light RhB removal compared to pure BOC and CN, respectively. The large enhancement in the photodegradation activity should be attributed to the synergistic effect of BOC and CN in BOC/CN nanosheets. The synergism reflects in the widened optical window for effective light absorption, enlarged interfacial area for more efficient electron-hole separation, and a shorter diffusion distance for facilitated charge transfer. A possible visible-light RhB photodegradation mechanism was proposed, based on theoretical analysis and active species trapping experiments.
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