Abstract
The g-C3N4 nanosheet was prepared by calcination method, the MoS2 nanosheet was prepared by hydrothermal method. The g-C3N4/MoS2 composites were prepared by ultrasonic composite in anhydrous ethanol. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, ultraviolet–visible spectroscopy, and photoluminescence techniques were used to characterize the materials. The photocatalytic degradation of Rhodamine B (Rh B) by g-C3N4/MoS2 composites with different mass ratios was investigated under visible light. The results show that a small amount of MoS2 combined with g-C3N4 can significantly improve photocatalytic activity. The g-C3N4/MoS2 composite with a mass ratio of 1:8 has the highest photocatalytic activity, and the degradation rate of Rh B increases from 50 to 99.6%. The main reason is that MoS2 and g-C3N4 have a matching band structure. The separation rate of photogenerated electron–hole pairs is enhanced. So the g-C3N4/MoS2 composite can improve the photocatalytic activity. Through the active material capture experiment, it is found that the main active material in the photocatalytic reaction process is holes, followed by superoxide radicals.
Highlights
Printing and dyeing wastewater, as a kind of industrial wastewater, has a large discharge
The results showed that the addition of MoS2 significantly improved the catalytic activity of g-C3N4 on Rhodamine B (Rh B) and methylene blue under visible light
The g-C3N4 nanosheets and MoS2 nanosheets were synthesized by thermal polymerization and hydrothermal method
Summary
As a kind of industrial wastewater, has a large discharge. Its specific surface area is relatively small, and the photo-generated electron-holes are easy to recombine These shortcomings make it unable to stand alone in the field of photocatalysis. Two-dimensional (2D) materials can be used in many places, including the field of photocatalysis by their super large specific surface area and suitable forbidden band width. It is one of the frontiers of research. Yan et al [25] used the ball milling method to compound g-C3N4 with MoS2 to disintegrate pollutants under visible light irradiation, which significantly improved the photocatalytic activity of semiconductor materials. The mechanism of photocatalytic degradation was further discussed by capturing active substances
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