Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 413, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125400
Keywords
G C3N4; BP; MoS2; Photocatalytic activity; Charge transfer mechanism
Categories
Funding
- National Natural Science Foundation of China [51672144, 51572137, 51702181, 52072196, 52002199, 52002200]
- Shandong Provincial Key Research and Development Program (SPKRDP) [2019GGX102055]
- Natural Science Foundation of Shandong Province [ZR2019BEM042]
- Innovation and Technology Program of Shandong Province [2020KJA004]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110933]
- China Postdoctoral Science Foundation [2020M683450]
- Taishan Scholars Program of Shandong Province [ts201511034]
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The study synthesized a novel high-efficiency molybdenum sulfide-modified metal-free photocatalyst via high-energy ball milling. This photocatalyst exhibited excellent photocatalytic activity due to its matched band structure, enhanced light absorption, intense interface contact, and specific charge transfer mechanism.
Improving the photocatalytic property of metal-free photocatalyst is still a challenging work. Herein, a novel high-efficiency molybdenum sulfide (MoS2)-modified metal-free graphitic carbon nitride (g-C3N4)/black phosphorus (BP) photocatalyst (MCN/BP/MS) was synthesized on a large scale via high-energy ball milling process. The optimized MCN/BP/MS exhibits the excellent hydrogen evolution rate of 2146.8 mu mol.g(-1).h(-1), and hexavalent chromium (Cr(VI)) reduction activity with an apparent rate constant of 0.1464 min(-1) and a degradation rate of 100% in 25 min. Detailed characterizations and mechanism research verified that the significantly improved photocatalytic activity of MCN/BP/MS mainly profited from the matched band structure, enhanced light absorption, intense interface contact, as well as the type-I/Z hybrid charge transfer mechanism, which gave rise to a consecutive multistep charge migration, thus the photocarriers transfer and separation can be greatly promoted, and the photogenerated electrons with high reducing capacity can be preserved. This work not only provides a high-efficiency g-C3N4-based noble-metal-free photocatalyst, but also affords a beneficial inspiration for improving the photocatalytic property of the metal free photocatalyst.
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