Study on g-C3N4/Pd/Bi2WO6 heterostructure and its synergistic degradation mechanism of bezafibrate
A flower-like g-C3N4/Pd/Bi2WO6 heterostructure with high visible light activity was designed and synthesized by low temperature hydrothermal method utilizing the plasmon resonance effect of noble metal Pd and the photocatalytic synergism of shape-controlled Bi2WO6.It was found that the composite of Pd/g-C3N4 and Bi2WO6 significantly enhanced removal efficiency of BZF under visible light irradiation.Further analysis of characterization showed that Bi2WO6 in g-C3N4/Pd/Bi2WO6 exhibited a central radiated flower-like nanostructure,which is connected with layered Pd/g-C3N4.The noble metal Pd could be used as the medium for electron transport to promote the formation of Z-type heterostructures between g-C3N4 and Bi2WO6,which is beneficial to cooperatively enhance the photocatalytic activity.It was confirmed that·OH was the main active species in degradation of BZF with g-C3N4/Pd/Bi2WO6 heterostructures by quenching experiments and EPR analysis.Moreover,the LC-MS/MS analysis indicated that hydroxylation with fibrate chain substituent was the main route of BZF degradation.
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