Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 190, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2019.110062
Keywords
g-C3N4 nanosheets; CeO2; Persulfate; Visible-light photocatalysis; Norfloxacin degradation
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Funding
- Sichuan Science and Technology Program [2019YFS0495]
- Fundamental Research Funds for the Central Universities, China [WUT: 195208001]
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In this work, the shuttle-like CeO2 modified g-C3N4 composite was synthesized and was combined with persulfate (PS) for the efficient photocatalytic degradation of norfloxacin (NOR) under visible light. Scanning and transmission electron microscopy (SEM and TEM), X-ray diffraction (XRD), UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) emission spectra were used to characterize the structural and optical properties of the as-prepared catalysts. Active species trapping experiments demonstrated that additional sulfate radicals (center dot SO4-) formed upon the addition of PS which could cooperate with superoxide radicals (center dot O-2(-)), holes (h(+)) and hydroxyl radicals (center dot OH) to decompose NOR. Singlet oxygen (O-1(2)) was also formed during the reaction and acted as an important active species. The degradation products of NOR were also identified and analyzed by using LC-MS technology, and the possible degradation mechanism and pathways were proposed and discussed. This work indicated that the shuttle-like CeO2 modified g-C3N4 coupled with PS displayed promising applications in the field of pharmaceutical wastewater purification.
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