Abstract
In this study, a highly efficient TiO2/carbon nitride (TCN-x) heterojunction photocatalyst was fabricated through the pyrolysis of an NH2-MIL-125/melamine mixture. The band edge positions of TiO2 and carbon nitride (CN) matched well, leading to improved photogenerated electron-hole separation ability and consequently, improved photocatalytic performance of the TiO2/g-C3N4 nanocomposite. This heterojunction photocatalyst exhibits excellent photocatalytic performance under visible light and effectively removes various water-soluble organic pollutants. Especially, the TCN-0.2 hybrid photocatalyst showed excellent photocatalytic activity and photocatalyst stability. With TCN-0.2, the maximum photodegradation efficiency of tetracycline (TC) and methylene blue (MB) are as high as 86.59% (60 min) and 91.40% (120 min), respectively. Compared with pristine TiO2 and carbon nitride, the efficiency of TCN-0.2 for photocatalytic degradation of TC and MB is greatly improved. Photocurrent and electrochemical impedance spectroscopy further demonstrate that the TCN-0.2 hybrid composite accelerates charge transfer.
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