Journal
APPLIED SURFACE SCIENCE
Volume 508, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.145225
Keywords
AgBr(Ag)/MIL-101(Cr)/CuFe2O4; Magnetism; Photoreduction; Nitrate; Dual Z-scheme
Categories
Funding
- National Natural Science Foundation of China [51478095, 51978133, 51878134, 51708094]
- Fundamental Research Funds for the Central Universities of China [2412018ZD016, 2412019QD009]
- Jilin Province Science and Technology Development Plan Project [20180520167JH]
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Photocatalytic reduction of nitrate has attracted much attention recently, however, low efficiency and difficult separation have limited its application in practice. In this study, the novel direct dual Z-scheme AgBr(Ag)/MIL-101(Cr)/CuFe2O4 (AB/M/CFO) was fabricated by the hydrothermal technology combined with the photodeposition method for the first time. The AB/M/CFO exhibited the highest nitrate conversion and nitrogen selectivity (79.9% and 94.5%, respectively) compared to AgBr(Ag)/MIL-101(Cr), MIL-101(Cr) and CuFe2O4 for 30 min UV-light irradiation. The dual Z-scheme of AB/M/CFO enhanced electron transfer and charge separation, which was proved by transient photocurrent responses, leading to a significant improvement in photocatalytic efficiency. Meanwhile, after four cycles, the AB/M/CFO photocatalyst also displayed a strong magnetic separation ability and excellent recycling stability. Furthermore, the excitation and electron transfer process over dual Z-scheme AB/M/CFO photocatalytic material were proposed, based on the radical trapping experiments. Our work provides a new strategy to construct dual Z-scheme MOFs-based materials that have promising applications in photocatalytic reduction of pollutants.
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