Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 246, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.116890
Keywords
Z-scheme heterojunction; MnO2/Mn-modified alkalinized g-C3N4; Fenton-like photocatalysis; Reactive oxygen species; Pharmaceutical pollutants
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Funding
- Natural Science Foundation of China [51978324]
- Key project of Natural Science Foundation of Jiangxi Province [20192ACBL20043]
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A porous Z-scheme MnO2/Mn-modified alkalinized g-C3N4 catalyst (MnO2/CNK-OH-Mn) was fabricated by calcination-impregnation method. MnO2/CNK-OH-Mn exhibited higher Fenton-like photocatalytic activity in degrading tetracycline than pure g-C3N4 and alkalinized g-C3N4. The optimal MnO2/CNK-OH-Mn-15(%) showed the highest catalytic activity with 96.7% tetracycline removal and 74.9% total organic carbon (TOC) removal efficiency due to the enhanced reactive oxygen species generation. The tetracycline degradation process followed two pathways, and the formation of NO3- further revealed deep mineralization of tetracycline to inorganic substance during the photocatalytic degradation. The highest center dot OH yield of MnO2/CNK-OH-Mn-15(%) was attributable to synergism of surface grafted hydroxyl groups, Z-scheme charge transfer and H2O2 activation via redox cycles of Mn(IV)/Mn(III)/Mn(II). The Fenton-like photocatalytic mechanism of Z-scheme MnO2/CNK-OH-Mn was presented. Moreover, MnO2/CNK-OH-Mn-15% can effectively dispose of pharmaceutical wastewater with 77.1% chemical oxygen demand (COD) removal.
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