Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 402, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123839
Keywords
carbon nitride; Z-scheme; photocatalysts; charge migration and separation
Categories
Funding
- National Natural Science Foundation of China [51808250, 41603097, 51872109, 51676082, 41931292]
- Natural Science Foundation of Jiangsu Province of China [BK20181070]
- China Postdoctoral Science Foundation [2017M610336]
- Science and Technology Research Programs of Guangdong Province [2019A1515011015]
- Science and Technology Program of Guangzhou [201904010353]
- Fundamental Research Funds for the Central Universities [19lgpy157]
- Hong Kong Scholars Program
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The study developed an efficient Z-scheme Co3O4/g-C3N4 heterojunction photocatalyst with highly efficient interfacial charge migration and separation, exhibiting high photocatalytic activity for visible-light-driven reduction of Cr(VI) and oxidation of TC, especially the Co3O4/g-C3N4-0.04 sample.
An efficient Z-scheme Co3O4/g-C3N4 heterojunction photocatalyst was developed via in-situ forming Co3O4 nanocubes on the g-C3N4 nanosheet in the hydrothermal process. The obtained photocatalyst exhibited high photocatalytic activity for the visible-light-driven catalytic reduction of Cr(VI) and catalytic oxidation of tetra-cycline (TC). Among the as-synthesized catalysts, Co3O4/g-C3N4-0.04 (the mass ratio of g-C3N4 to Co3O4 is 0.04) sample exhibits the most efficient catalytic activities. The photocatalytic reduction and photocatalytic oxidation efficiencies of Co3O4/g-C3N4-0.04 can obtain 81.3 and 92.6 %, respectively. Moreover, the TC is mineralized in the course of photocatalytic degradation, 72.2% of TOC is removed from the reaction system. In addition, the apparent quantum efficiency for the removal of Cr(VI) was also obtained and the the Co3O4/g-C3N4-0.04 could achieve the highest apparent quantum efficiency among the samples. The enhancing photocatalytic activities originated from the efficient interfacial charge migration and separation obtained in Co3O4/g-C3N4-0.04, which is preliminarily confirmed by the photoluminescence spectra, time-resolved photoluminescence spectra and the photoelectrochemical characterizations. Finally, we speculate that the Co3O4/g-C3N4 heterostructures follow a more reasonable Z-scheme charge transfer in this study, which is confirmed by analyzing the results of electron paramagnetic resonance, radical scavenging experiments, and theoretical calculations.
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