Abstract
The MIL-88A/g-C3N4 heterojunction photocatalyst with high physicochemical stability and excellent charge transfer has been successfully developed in this study, and the synergistic effect and the photocatalytic mechanism of the MIL-88A/g-C3N4 composite for Acid Red 1 (AR1) dye decomposition has been discussed in detail. Under simulated-sunlight irradiation, the MIL-88A/g-C3N4 composite showed excellent photocatalytic efficiency for AR1 dye decomposition (100% decomposition efficiency within 30 min for 10 ppm AR1 dye) without the addition of any oxidizing agent, and the composite maintained 97% decomposition efficiency when used repeatedly. The Nyquist plot analysis and the electrochemical analysis results confirm that the improved photo-generated electrons and holes separation and transfer efficiencies of MIL-88A/g-C3N4 could be attributed to the Z-scheme structure formed between MIL-88A and g-C3N4, leading to excellent oxidation efficiency of AR1 dye. The effects of synthesis time of MIL-88A and coupling ratio of MIL-88A on the photocatalytic activity of MIL-88A/g-C3N4 heterojunction composites have been detailed evaluated in this study.
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