期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 810, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.151885
关键词
g-C3N4-RP heterostructure; Strong interfacial binding; Photocatalysis; Organic pollutant degradation; Mechanism
资金
- National Natural Science Foundation of China [21806059]
- Natural Science Foundation of Jiangsu Higher Education institution [17KJB610006]
- China Postdoctoral Science Foundation [2018M630524]
- Doctoral Research Foundation of Lanzhou City University [LZCU-BS2018-30]
The development of low-cost and efficient photocatalysts is pursued to promote the large-scale application of photocatalysis in environmental remediation. In this study, cost-effective g-C3N4-RP (red phosphorus) heterostructures were controllably fabricated, in which sodium hypophosphite was utilized as a new phosphorus source. The formed RP exhibited a particle morphology with the size of 60-100 nm. These nanoparticles were strongly bonded to the g-C3N4 surface by forming P-N chemical bonds. When compared with pristine g-C3N4, the as-synthesized g-C3N4-RP hybrids exhibited synergistically improved adsorption and photocatalytic activity for the removal of Rhodamine B (RhB) pollutant in aqueous solution. The improved adsorption for g-C3N4-RP resulted from the higher surface area, presence of the manufactured larger delocalized system, and more negatively charged surface when RP was introduced. Meanwhile, the improved performance of the photocatalysis was a result of the strengthened light adsorption, improved separation and transfer of photogenerated electron-hole pairs, and efficient surface reaction. A typical Type II heterostructure was confirmed to be formed at the interface to accelerate the charge carrier transfer between g-C3N4 and RP. The h(+) and center dot O-2(-). radicals were determined to be the major oxide species for RhB degradation. Finally, a possible RhB degradation mechanism was revealed in the g-C3N4-RP photocatalytic system. We believe that this study is of importance to accelerate the development of low-cost and effective catalysts for wastewater remediation by photocatalysis. (C) 2019 Elsevier B. V. All rights reserved.
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